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1802d0be | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
de56a948 | 2 | /* |
de56a948 PM |
3 | * |
4 | * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> | |
5 | * | |
6 | * Derived from book3s_rmhandlers.S and other files, which are: | |
7 | * | |
8 | * Copyright SUSE Linux Products GmbH 2009 | |
9 | * | |
10 | * Authors: Alexander Graf <agraf@suse.de> | |
11 | */ | |
12 | ||
13 | #include <asm/ppc_asm.h> | |
14 | #include <asm/kvm_asm.h> | |
15 | #include <asm/reg.h> | |
177339d7 | 16 | #include <asm/mmu.h> |
de56a948 | 17 | #include <asm/page.h> |
177339d7 PM |
18 | #include <asm/ptrace.h> |
19 | #include <asm/hvcall.h> | |
de56a948 PM |
20 | #include <asm/asm-offsets.h> |
21 | #include <asm/exception-64s.h> | |
f0888f70 | 22 | #include <asm/kvm_book3s_asm.h> |
f64e8084 | 23 | #include <asm/book3s/64/mmu-hash.h> |
41f4e631 | 24 | #include <asm/export.h> |
e4e38121 | 25 | #include <asm/tm.h> |
fd7bacbc | 26 | #include <asm/opal.h> |
5af50993 | 27 | #include <asm/xive-regs.h> |
857b99e1 | 28 | #include <asm/thread_info.h> |
ec0c464c | 29 | #include <asm/asm-compat.h> |
2c86cd18 | 30 | #include <asm/feature-fixups.h> |
10d91611 | 31 | #include <asm/cpuidle.h> |
6c85b7bc | 32 | #include <asm/ultravisor-api.h> |
e4e38121 | 33 | |
2f272463 PM |
34 | /* Sign-extend HDEC if not on POWER9 */ |
35 | #define EXTEND_HDEC(reg) \ | |
36 | BEGIN_FTR_SECTION; \ | |
37 | extsw reg, reg; \ | |
38 | END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300) | |
39 | ||
e0b7ec05 PM |
40 | /* Values in HSTATE_NAPPING(r13) */ |
41 | #define NAPPING_CEDE 1 | |
42 | #define NAPPING_NOVCPU 2 | |
10d91611 | 43 | #define NAPPING_UNSPLIT 3 |
e0b7ec05 | 44 | |
7ceaa6dc | 45 | /* Stack frame offsets for kvmppc_hv_entry */ |
95a6432c | 46 | #define SFS 208 |
7ceaa6dc | 47 | #define STACK_SLOT_TRAP (SFS-4) |
95a6432c | 48 | #define STACK_SLOT_SHORT_PATH (SFS-8) |
7ceaa6dc PM |
49 | #define STACK_SLOT_TID (SFS-16) |
50 | #define STACK_SLOT_PSSCR (SFS-24) | |
51 | #define STACK_SLOT_PID (SFS-32) | |
52 | #define STACK_SLOT_IAMR (SFS-40) | |
53 | #define STACK_SLOT_CIABR (SFS-48) | |
54 | #define STACK_SLOT_DAWR (SFS-56) | |
55 | #define STACK_SLOT_DAWRX (SFS-64) | |
769377f7 | 56 | #define STACK_SLOT_HFSCR (SFS-72) |
c3c7470c ME |
57 | #define STACK_SLOT_AMR (SFS-80) |
58 | #define STACK_SLOT_UAMOR (SFS-88) | |
95a6432c PM |
59 | /* the following is used by the P9 short path */ |
60 | #define STACK_SLOT_NVGPRS (SFS-152) /* 18 gprs */ | |
7ceaa6dc | 61 | |
de56a948 | 62 | /* |
19ccb76a | 63 | * Call kvmppc_hv_entry in real mode. |
de56a948 PM |
64 | * Must be called with interrupts hard-disabled. |
65 | * | |
66 | * Input Registers: | |
67 | * | |
68 | * LR = return address to continue at after eventually re-enabling MMU | |
69 | */ | |
6ed179b6 | 70 | _GLOBAL_TOC(kvmppc_hv_entry_trampoline) |
218309b7 PM |
71 | mflr r0 |
72 | std r0, PPC_LR_STKOFF(r1) | |
73 | stdu r1, -112(r1) | |
de56a948 | 74 | mfmsr r10 |
8b24e69f | 75 | std r10, HSTATE_HOST_MSR(r13) |
218309b7 | 76 | LOAD_REG_ADDR(r5, kvmppc_call_hv_entry) |
de56a948 PM |
77 | li r0,MSR_RI |
78 | andc r0,r10,r0 | |
79 | li r6,MSR_IR | MSR_DR | |
80 | andc r6,r10,r6 | |
81 | mtmsrd r0,1 /* clear RI in MSR */ | |
82 | mtsrr0 r5 | |
83 | mtsrr1 r6 | |
222f20f1 | 84 | RFI_TO_KERNEL |
de56a948 | 85 | |
218309b7 | 86 | kvmppc_call_hv_entry: |
c0101509 PM |
87 | BEGIN_FTR_SECTION |
88 | /* On P9, do LPCR setting, if necessary */ | |
89 | ld r3, HSTATE_SPLIT_MODE(r13) | |
90 | cmpdi r3, 0 | |
91 | beq 46f | |
92 | lwz r4, KVM_SPLIT_DO_SET(r3) | |
93 | cmpwi r4, 0 | |
94 | beq 46f | |
95 | bl kvmhv_p9_set_lpcr | |
96 | nop | |
97 | 46: | |
98 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) | |
99 | ||
e0b7ec05 | 100 | ld r4, HSTATE_KVM_VCPU(r13) |
218309b7 PM |
101 | bl kvmppc_hv_entry |
102 | ||
103 | /* Back from guest - restore host state and return to caller */ | |
104 | ||
eee7ff9d | 105 | BEGIN_FTR_SECTION |
218309b7 PM |
106 | /* Restore host DABR and DABRX */ |
107 | ld r5,HSTATE_DABR(r13) | |
108 | li r6,7 | |
109 | mtspr SPRN_DABR,r5 | |
110 | mtspr SPRN_DABRX,r6 | |
eee7ff9d | 111 | END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) |
218309b7 PM |
112 | |
113 | /* Restore SPRG3 */ | |
9d378dfa SW |
114 | ld r3,PACA_SPRG_VDSO(r13) |
115 | mtspr SPRN_SPRG_VDSO_WRITE,r3 | |
218309b7 | 116 | |
218309b7 | 117 | /* Reload the host's PMU registers */ |
41f4e631 | 118 | bl kvmhv_load_host_pmu |
218309b7 | 119 | |
e0b7ec05 PM |
120 | /* |
121 | * Reload DEC. HDEC interrupts were disabled when | |
122 | * we reloaded the host's LPCR value. | |
123 | */ | |
124 | ld r3, HSTATE_DECEXP(r13) | |
125 | mftb r4 | |
126 | subf r4, r4, r3 | |
127 | mtspr SPRN_DEC, r4 | |
128 | ||
b4deba5c PM |
129 | /* hwthread_req may have got set by cede or no vcpu, so clear it */ |
130 | li r0, 0 | |
131 | stb r0, HSTATE_HWTHREAD_REQ(r13) | |
132 | ||
218309b7 | 133 | /* |
e20bbd3d AP |
134 | * For external interrupts we need to call the Linux |
135 | * handler to process the interrupt. We do that by jumping | |
136 | * to absolute address 0x500 for external interrupts. | |
137 | * The [h]rfid at the end of the handler will return to | |
138 | * the book3s_hv_interrupts.S code. For other interrupts | |
139 | * we do the rfid to get back to the book3s_hv_interrupts.S | |
140 | * code here. | |
218309b7 PM |
141 | */ |
142 | ld r8, 112+PPC_LR_STKOFF(r1) | |
143 | addi r1, r1, 112 | |
144 | ld r7, HSTATE_HOST_MSR(r13) | |
145 | ||
8b24e69f PM |
146 | /* Return the trap number on this thread as the return value */ |
147 | mr r3, r12 | |
148 | ||
53af3ba2 PM |
149 | /* |
150 | * If we came back from the guest via a relocation-on interrupt, | |
151 | * we will be in virtual mode at this point, which makes it a | |
152 | * little easier to get back to the caller. | |
153 | */ | |
154 | mfmsr r0 | |
155 | andi. r0, r0, MSR_IR /* in real mode? */ | |
156 | bne .Lvirt_return | |
157 | ||
8b24e69f | 158 | /* RFI into the highmem handler */ |
218309b7 PM |
159 | mfmsr r6 |
160 | li r0, MSR_RI | |
161 | andc r6, r6, r0 | |
162 | mtmsrd r6, 1 /* Clear RI in MSR */ | |
163 | mtsrr0 r8 | |
164 | mtsrr1 r7 | |
222f20f1 | 165 | RFI_TO_KERNEL |
218309b7 | 166 | |
8b24e69f | 167 | /* Virtual-mode return */ |
53af3ba2 | 168 | .Lvirt_return: |
8b24e69f | 169 | mtlr r8 |
53af3ba2 PM |
170 | blr |
171 | ||
e0b7ec05 PM |
172 | kvmppc_primary_no_guest: |
173 | /* We handle this much like a ceded vcpu */ | |
fd6d53b1 | 174 | /* put the HDEC into the DEC, since HDEC interrupts don't wake us */ |
2f272463 PM |
175 | /* HDEC may be larger than DEC for arch >= v3.00, but since the */ |
176 | /* HDEC value came from DEC in the first place, it will fit */ | |
fd6d53b1 PM |
177 | mfspr r3, SPRN_HDEC |
178 | mtspr SPRN_DEC, r3 | |
6af27c84 PM |
179 | /* |
180 | * Make sure the primary has finished the MMU switch. | |
181 | * We should never get here on a secondary thread, but | |
182 | * check it for robustness' sake. | |
183 | */ | |
184 | ld r5, HSTATE_KVM_VCORE(r13) | |
185 | 65: lbz r0, VCORE_IN_GUEST(r5) | |
186 | cmpwi r0, 0 | |
187 | beq 65b | |
188 | /* Set LPCR. */ | |
189 | ld r8,VCORE_LPCR(r5) | |
190 | mtspr SPRN_LPCR,r8 | |
191 | isync | |
e0b7ec05 PM |
192 | /* set our bit in napping_threads */ |
193 | ld r5, HSTATE_KVM_VCORE(r13) | |
194 | lbz r7, HSTATE_PTID(r13) | |
195 | li r0, 1 | |
196 | sld r0, r0, r7 | |
197 | addi r6, r5, VCORE_NAPPING_THREADS | |
198 | 1: lwarx r3, 0, r6 | |
199 | or r3, r3, r0 | |
200 | stwcx. r3, 0, r6 | |
201 | bne 1b | |
7d6c40da | 202 | /* order napping_threads update vs testing entry_exit_map */ |
e0b7ec05 PM |
203 | isync |
204 | li r12, 0 | |
205 | lwz r7, VCORE_ENTRY_EXIT(r5) | |
206 | cmpwi r7, 0x100 | |
207 | bge kvm_novcpu_exit /* another thread already exiting */ | |
208 | li r3, NAPPING_NOVCPU | |
209 | stb r3, HSTATE_NAPPING(r13) | |
e0b7ec05 | 210 | |
ccc07772 | 211 | li r3, 0 /* Don't wake on privileged (OS) doorbell */ |
e0b7ec05 PM |
212 | b kvm_do_nap |
213 | ||
37f55d30 SW |
214 | /* |
215 | * kvm_novcpu_wakeup | |
216 | * Entered from kvm_start_guest if kvm_hstate.napping is set | |
217 | * to NAPPING_NOVCPU | |
218 | * r2 = kernel TOC | |
219 | * r13 = paca | |
220 | */ | |
e0b7ec05 PM |
221 | kvm_novcpu_wakeup: |
222 | ld r1, HSTATE_HOST_R1(r13) | |
223 | ld r5, HSTATE_KVM_VCORE(r13) | |
224 | li r0, 0 | |
225 | stb r0, HSTATE_NAPPING(r13) | |
e0b7ec05 | 226 | |
e3bbbbfa PM |
227 | /* check the wake reason */ |
228 | bl kvmppc_check_wake_reason | |
6af27c84 | 229 | |
37f55d30 SW |
230 | /* |
231 | * Restore volatile registers since we could have called | |
232 | * a C routine in kvmppc_check_wake_reason. | |
233 | * r5 = VCORE | |
234 | */ | |
235 | ld r5, HSTATE_KVM_VCORE(r13) | |
236 | ||
e0b7ec05 | 237 | /* see if any other thread is already exiting */ |
e0b7ec05 PM |
238 | lwz r0, VCORE_ENTRY_EXIT(r5) |
239 | cmpwi r0, 0x100 | |
240 | bge kvm_novcpu_exit | |
241 | ||
242 | /* clear our bit in napping_threads */ | |
243 | lbz r7, HSTATE_PTID(r13) | |
244 | li r0, 1 | |
245 | sld r0, r0, r7 | |
246 | addi r6, r5, VCORE_NAPPING_THREADS | |
e3bbbbfa PM |
247 | 4: lwarx r7, 0, r6 |
248 | andc r7, r7, r0 | |
249 | stwcx. r7, 0, r6 | |
e0b7ec05 PM |
250 | bne 4b |
251 | ||
e3bbbbfa | 252 | /* See if the wake reason means we need to exit */ |
e0b7ec05 PM |
253 | cmpdi r3, 0 |
254 | bge kvm_novcpu_exit | |
e0b7ec05 | 255 | |
fd6d53b1 PM |
256 | /* See if our timeslice has expired (HDEC is negative) */ |
257 | mfspr r0, SPRN_HDEC | |
2f272463 | 258 | EXTEND_HDEC(r0) |
fd6d53b1 | 259 | li r12, BOOK3S_INTERRUPT_HV_DECREMENTER |
2f272463 | 260 | cmpdi r0, 0 |
fd6d53b1 PM |
261 | blt kvm_novcpu_exit |
262 | ||
e0b7ec05 PM |
263 | /* Got an IPI but other vcpus aren't yet exiting, must be a latecomer */ |
264 | ld r4, HSTATE_KVM_VCPU(r13) | |
265 | cmpdi r4, 0 | |
b6c295df PM |
266 | beq kvmppc_primary_no_guest |
267 | ||
268 | #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING | |
269 | addi r3, r4, VCPU_TB_RMENTRY | |
270 | bl kvmhv_start_timing | |
271 | #endif | |
272 | b kvmppc_got_guest | |
e0b7ec05 PM |
273 | |
274 | kvm_novcpu_exit: | |
6af27c84 PM |
275 | #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING |
276 | ld r4, HSTATE_KVM_VCPU(r13) | |
277 | cmpdi r4, 0 | |
278 | beq 13f | |
279 | addi r3, r4, VCPU_TB_RMEXIT | |
280 | bl kvmhv_accumulate_time | |
281 | #endif | |
eddb60fb | 282 | 13: mr r3, r12 |
7ceaa6dc | 283 | stw r12, STACK_SLOT_TRAP(r1) |
eddb60fb PM |
284 | bl kvmhv_commence_exit |
285 | nop | |
6af27c84 | 286 | b kvmhv_switch_to_host |
e0b7ec05 | 287 | |
371fefd6 | 288 | /* |
10d91611 NP |
289 | * We come in here when wakened from Linux offline idle code. |
290 | * Relocation is off | |
9d292501 | 291 | * r3 contains the SRR1 wakeup value, SRR1 is trashed. |
371fefd6 | 292 | */ |
10d91611 NP |
293 | _GLOBAL(idle_kvm_start_guest) |
294 | ld r4,PACAEMERGSP(r13) | |
295 | mfcr r5 | |
296 | mflr r0 | |
297 | std r1,0(r4) | |
298 | std r5,8(r4) | |
299 | std r0,16(r4) | |
300 | subi r1,r4,STACK_FRAME_OVERHEAD | |
301 | SAVE_NVGPRS(r1) | |
fd17dc7b | 302 | |
9d292501 NP |
303 | /* |
304 | * Could avoid this and pass it through in r3. For now, | |
305 | * code expects it to be in SRR1. | |
306 | */ | |
307 | mtspr SPRN_SRR1,r3 | |
308 | ||
a4bc64d3 NR |
309 | li r0,0 |
310 | stb r0,PACA_FTRACE_ENABLED(r13) | |
311 | ||
f0888f70 PM |
312 | li r0,KVM_HWTHREAD_IN_KVM |
313 | stb r0,HSTATE_HWTHREAD_STATE(r13) | |
371fefd6 | 314 | |
10d91611 | 315 | /* kvm cede / napping does not come through here */ |
4619ac88 | 316 | lbz r0,HSTATE_NAPPING(r13) |
10d91611 NP |
317 | twnei r0,0 |
318 | ||
319 | b 1f | |
320 | ||
321 | kvm_unsplit_wakeup: | |
322 | li r0, 0 | |
323 | stb r0, HSTATE_NAPPING(r13) | |
e0b7ec05 | 324 | |
10d91611 | 325 | 1: |
4619ac88 PM |
326 | |
327 | /* | |
328 | * We weren't napping due to cede, so this must be a secondary | |
329 | * thread being woken up to run a guest, or being woken up due | |
330 | * to a stray IPI. (Or due to some machine check or hypervisor | |
331 | * maintenance interrupt while the core is in KVM.) | |
332 | */ | |
f0888f70 PM |
333 | |
334 | /* Check the wake reason in SRR1 to see why we got here */ | |
e3bbbbfa | 335 | bl kvmppc_check_wake_reason |
37f55d30 SW |
336 | /* |
337 | * kvmppc_check_wake_reason could invoke a C routine, but we | |
338 | * have no volatile registers to restore when we return. | |
339 | */ | |
340 | ||
e3bbbbfa PM |
341 | cmpdi r3, 0 |
342 | bge kvm_no_guest | |
371fefd6 | 343 | |
b4deba5c PM |
344 | /* get vcore pointer, NULL if we have nothing to run */ |
345 | ld r5,HSTATE_KVM_VCORE(r13) | |
346 | cmpdi r5,0 | |
347 | /* if we have no vcore to run, go back to sleep */ | |
7b444c67 | 348 | beq kvm_no_guest |
f0888f70 | 349 | |
56548fc0 PM |
350 | kvm_secondary_got_guest: |
351 | ||
e0b7ec05 | 352 | /* Set HSTATE_DSCR(r13) to something sensible */ |
1db36525 | 353 | ld r6, PACA_DSCR_DEFAULT(r13) |
e0b7ec05 | 354 | std r6, HSTATE_DSCR(r13) |
2fde6d20 | 355 | |
b4deba5c PM |
356 | /* On thread 0 of a subcore, set HDEC to max */ |
357 | lbz r4, HSTATE_PTID(r13) | |
358 | cmpwi r4, 0 | |
359 | bne 63f | |
2f272463 PM |
360 | LOAD_REG_ADDR(r6, decrementer_max) |
361 | ld r6, 0(r6) | |
b4deba5c PM |
362 | mtspr SPRN_HDEC, r6 |
363 | /* and set per-LPAR registers, if doing dynamic micro-threading */ | |
364 | ld r6, HSTATE_SPLIT_MODE(r13) | |
365 | cmpdi r6, 0 | |
366 | beq 63f | |
c0101509 | 367 | BEGIN_FTR_SECTION |
b4deba5c PM |
368 | ld r0, KVM_SPLIT_RPR(r6) |
369 | mtspr SPRN_RPR, r0 | |
370 | ld r0, KVM_SPLIT_PMMAR(r6) | |
371 | mtspr SPRN_PMMAR, r0 | |
372 | ld r0, KVM_SPLIT_LDBAR(r6) | |
373 | mtspr SPRN_LDBAR, r0 | |
374 | isync | |
c0101509 PM |
375 | FTR_SECTION_ELSE |
376 | /* On P9 we use the split_info for coordinating LPCR changes */ | |
377 | lwz r4, KVM_SPLIT_DO_SET(r6) | |
378 | cmpwi r4, 0 | |
d20fe50a | 379 | beq 1f |
c0101509 PM |
380 | mr r3, r6 |
381 | bl kvmhv_p9_set_lpcr | |
382 | nop | |
d20fe50a | 383 | 1: |
c0101509 | 384 | ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_300) |
b4deba5c PM |
385 | 63: |
386 | /* Order load of vcpu after load of vcore */ | |
5d5b99cd | 387 | lwsync |
b4deba5c | 388 | ld r4, HSTATE_KVM_VCPU(r13) |
e0b7ec05 | 389 | bl kvmppc_hv_entry |
218309b7 PM |
390 | |
391 | /* Back from the guest, go back to nap */ | |
b4deba5c | 392 | /* Clear our vcpu and vcore pointers so we don't come back in early */ |
218309b7 | 393 | li r0, 0 |
b4deba5c | 394 | std r0, HSTATE_KVM_VCPU(r13) |
f019b7ad | 395 | /* |
b4deba5c | 396 | * Once we clear HSTATE_KVM_VCORE(r13), the code in |
5d5b99cd PM |
397 | * kvmppc_run_core() is going to assume that all our vcpu |
398 | * state is visible in memory. This lwsync makes sure | |
399 | * that that is true. | |
f019b7ad | 400 | */ |
218309b7 | 401 | lwsync |
b4deba5c | 402 | std r0, HSTATE_KVM_VCORE(r13) |
218309b7 | 403 | |
fd7bacbc MS |
404 | /* |
405 | * All secondaries exiting guest will fall through this path. | |
406 | * Before proceeding, just check for HMI interrupt and | |
407 | * invoke opal hmi handler. By now we are sure that the | |
408 | * primary thread on this core/subcore has already made partition | |
409 | * switch/TB resync and we are good to call opal hmi handler. | |
410 | */ | |
411 | cmpwi r12, BOOK3S_INTERRUPT_HMI | |
412 | bne kvm_no_guest | |
413 | ||
414 | li r3,0 /* NULL argument */ | |
415 | bl hmi_exception_realmode | |
56548fc0 PM |
416 | /* |
417 | * At this point we have finished executing in the guest. | |
418 | * We need to wait for hwthread_req to become zero, since | |
419 | * we may not turn on the MMU while hwthread_req is non-zero. | |
420 | * While waiting we also need to check if we get given a vcpu to run. | |
421 | */ | |
218309b7 | 422 | kvm_no_guest: |
56548fc0 PM |
423 | lbz r3, HSTATE_HWTHREAD_REQ(r13) |
424 | cmpwi r3, 0 | |
425 | bne 53f | |
426 | HMT_MEDIUM | |
427 | li r0, KVM_HWTHREAD_IN_KERNEL | |
218309b7 | 428 | stb r0, HSTATE_HWTHREAD_STATE(r13) |
56548fc0 PM |
429 | /* need to recheck hwthread_req after a barrier, to avoid race */ |
430 | sync | |
431 | lbz r3, HSTATE_HWTHREAD_REQ(r13) | |
432 | cmpwi r3, 0 | |
433 | bne 54f | |
10d91611 NP |
434 | |
435 | /* | |
436 | * Jump to idle_return_gpr_loss, which returns to the | |
437 | * idle_kvm_start_guest caller. | |
438 | */ | |
218309b7 PM |
439 | li r3, LPCR_PECE0 |
440 | mfspr r4, SPRN_LPCR | |
441 | rlwimi r4, r3, 0, LPCR_PECE0 | LPCR_PECE1 | |
442 | mtspr SPRN_LPCR, r4 | |
10d91611 NP |
443 | /* set up r3 for return */ |
444 | mfspr r3,SPRN_SRR1 | |
445 | REST_NVGPRS(r1) | |
446 | addi r1, r1, STACK_FRAME_OVERHEAD | |
447 | ld r0, 16(r1) | |
448 | ld r5, 8(r1) | |
449 | ld r1, 0(r1) | |
450 | mtlr r0 | |
451 | mtcr r5 | |
452 | blr | |
56548fc0 PM |
453 | |
454 | 53: HMT_LOW | |
b4deba5c PM |
455 | ld r5, HSTATE_KVM_VCORE(r13) |
456 | cmpdi r5, 0 | |
457 | bne 60f | |
458 | ld r3, HSTATE_SPLIT_MODE(r13) | |
459 | cmpdi r3, 0 | |
460 | beq kvm_no_guest | |
c0101509 PM |
461 | lwz r0, KVM_SPLIT_DO_SET(r3) |
462 | cmpwi r0, 0 | |
463 | bne kvmhv_do_set | |
464 | lwz r0, KVM_SPLIT_DO_RESTORE(r3) | |
465 | cmpwi r0, 0 | |
466 | bne kvmhv_do_restore | |
b4deba5c PM |
467 | lbz r0, KVM_SPLIT_DO_NAP(r3) |
468 | cmpwi r0, 0 | |
56548fc0 PM |
469 | beq kvm_no_guest |
470 | HMT_MEDIUM | |
b4deba5c PM |
471 | b kvm_unsplit_nap |
472 | 60: HMT_MEDIUM | |
56548fc0 PM |
473 | b kvm_secondary_got_guest |
474 | ||
475 | 54: li r0, KVM_HWTHREAD_IN_KVM | |
476 | stb r0, HSTATE_HWTHREAD_STATE(r13) | |
477 | b kvm_no_guest | |
218309b7 | 478 | |
c0101509 PM |
479 | kvmhv_do_set: |
480 | /* Set LPCR, LPIDR etc. on P9 */ | |
481 | HMT_MEDIUM | |
482 | bl kvmhv_p9_set_lpcr | |
483 | nop | |
484 | b kvm_no_guest | |
485 | ||
486 | kvmhv_do_restore: | |
487 | HMT_MEDIUM | |
488 | bl kvmhv_p9_restore_lpcr | |
489 | nop | |
490 | b kvm_no_guest | |
491 | ||
b4deba5c PM |
492 | /* |
493 | * Here the primary thread is trying to return the core to | |
494 | * whole-core mode, so we need to nap. | |
495 | */ | |
496 | kvm_unsplit_nap: | |
fd7bacbc MS |
497 | /* |
498 | * When secondaries are napping in kvm_unsplit_nap() with | |
499 | * hwthread_req = 1, HMI goes ignored even though subcores are | |
500 | * already exited the guest. Hence HMI keeps waking up secondaries | |
501 | * from nap in a loop and secondaries always go back to nap since | |
502 | * no vcore is assigned to them. This makes impossible for primary | |
503 | * thread to get hold of secondary threads resulting into a soft | |
504 | * lockup in KVM path. | |
505 | * | |
506 | * Let us check if HMI is pending and handle it before we go to nap. | |
507 | */ | |
508 | cmpwi r12, BOOK3S_INTERRUPT_HMI | |
509 | bne 55f | |
510 | li r3, 0 /* NULL argument */ | |
511 | bl hmi_exception_realmode | |
512 | 55: | |
7f235328 GS |
513 | /* |
514 | * Ensure that secondary doesn't nap when it has | |
515 | * its vcore pointer set. | |
516 | */ | |
517 | sync /* matches smp_mb() before setting split_info.do_nap */ | |
518 | ld r0, HSTATE_KVM_VCORE(r13) | |
519 | cmpdi r0, 0 | |
520 | bne kvm_no_guest | |
b4deba5c PM |
521 | /* clear any pending message */ |
522 | BEGIN_FTR_SECTION | |
523 | lis r6, (PPC_DBELL_SERVER << (63-36))@h | |
524 | PPC_MSGCLR(6) | |
525 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) | |
526 | /* Set kvm_split_mode.napped[tid] = 1 */ | |
527 | ld r3, HSTATE_SPLIT_MODE(r13) | |
528 | li r0, 1 | |
c0101509 | 529 | lbz r4, HSTATE_TID(r13) |
b4deba5c PM |
530 | addi r4, r4, KVM_SPLIT_NAPPED |
531 | stbx r0, r3, r4 | |
532 | /* Check the do_nap flag again after setting napped[] */ | |
533 | sync | |
534 | lbz r0, KVM_SPLIT_DO_NAP(r3) | |
535 | cmpwi r0, 0 | |
536 | beq 57f | |
10d91611 NP |
537 | li r3, NAPPING_UNSPLIT |
538 | stb r3, HSTATE_NAPPING(r13) | |
b4deba5c | 539 | li r3, (LPCR_PECEDH | LPCR_PECE0) >> 4 |
bf53c88e PM |
540 | mfspr r5, SPRN_LPCR |
541 | rlwimi r5, r3, 4, (LPCR_PECEDP | LPCR_PECEDH | LPCR_PECE0 | LPCR_PECE1) | |
542 | b kvm_nap_sequence | |
b4deba5c PM |
543 | |
544 | 57: li r0, 0 | |
545 | stbx r0, r3, r4 | |
546 | b kvm_no_guest | |
547 | ||
218309b7 PM |
548 | /****************************************************************************** |
549 | * * | |
550 | * Entry code * | |
551 | * * | |
552 | *****************************************************************************/ | |
553 | ||
de56a948 PM |
554 | .global kvmppc_hv_entry |
555 | kvmppc_hv_entry: | |
556 | ||
557 | /* Required state: | |
558 | * | |
e0b7ec05 | 559 | * R4 = vcpu pointer (or NULL) |
de56a948 PM |
560 | * MSR = ~IR|DR |
561 | * R13 = PACA | |
562 | * R1 = host R1 | |
06a29e42 | 563 | * R2 = TOC |
de56a948 | 564 | * all other volatile GPRS = free |
f4c51f84 | 565 | * Does not preserve non-volatile GPRs or CR fields |
de56a948 PM |
566 | */ |
567 | mflr r0 | |
218309b7 | 568 | std r0, PPC_LR_STKOFF(r1) |
7ceaa6dc | 569 | stdu r1, -SFS(r1) |
de56a948 | 570 | |
de56a948 PM |
571 | /* Save R1 in the PACA */ |
572 | std r1, HSTATE_HOST_R1(r13) | |
573 | ||
44a3add8 PM |
574 | li r6, KVM_GUEST_MODE_HOST_HV |
575 | stb r6, HSTATE_IN_GUEST(r13) | |
576 | ||
b6c295df PM |
577 | #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING |
578 | /* Store initial timestamp */ | |
579 | cmpdi r4, 0 | |
580 | beq 1f | |
581 | addi r3, r4, VCPU_TB_RMENTRY | |
582 | bl kvmhv_start_timing | |
583 | 1: | |
584 | #endif | |
f4c51f84 | 585 | |
f4c51f84 PM |
586 | ld r5, HSTATE_KVM_VCORE(r13) |
587 | ld r9, VCORE_KVM(r5) /* pointer to struct kvm */ | |
f4c51f84 | 588 | |
9e368f29 | 589 | /* |
c17b98cf | 590 | * POWER7/POWER8 host -> guest partition switch code. |
9e368f29 PM |
591 | * We don't have to lock against concurrent tlbies, |
592 | * but we do have to coordinate across hardware threads. | |
593 | */ | |
7d6c40da | 594 | /* Set bit in entry map iff exit map is zero. */ |
7d6c40da PM |
595 | li r7, 1 |
596 | lbz r6, HSTATE_PTID(r13) | |
597 | sld r7, r7, r6 | |
f4c51f84 PM |
598 | addi r8, r5, VCORE_ENTRY_EXIT |
599 | 21: lwarx r3, 0, r8 | |
7d6c40da | 600 | cmpwi r3, 0x100 /* any threads starting to exit? */ |
371fefd6 | 601 | bge secondary_too_late /* if so we're too late to the party */ |
7d6c40da | 602 | or r3, r3, r7 |
f4c51f84 | 603 | stwcx. r3, 0, r8 |
371fefd6 PM |
604 | bne 21b |
605 | ||
606 | /* Primary thread switches to guest partition. */ | |
371fefd6 | 607 | cmpwi r6,0 |
6af27c84 | 608 | bne 10f |
9a4506e1 | 609 | |
de56a948 | 610 | lwz r7,KVM_LPID(r9) |
7a84084c PM |
611 | BEGIN_FTR_SECTION |
612 | ld r6,KVM_SDR1(r9) | |
de56a948 PM |
613 | li r0,LPID_RSVD /* switch to reserved LPID */ |
614 | mtspr SPRN_LPID,r0 | |
615 | ptesync | |
616 | mtspr SPRN_SDR1,r6 /* switch to partition page table */ | |
7a84084c | 617 | END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300) |
de56a948 PM |
618 | mtspr SPRN_LPID,r7 |
619 | isync | |
1b400ba0 | 620 | |
70ea13f6 | 621 | /* See if we need to flush the TLB. */ |
2940ba0c | 622 | mr r3, r9 /* kvm pointer */ |
70ea13f6 PM |
623 | lhz r4, PACAPACAINDEX(r13) /* physical cpu number */ |
624 | li r5, 0 /* nested vcpu pointer */ | |
625 | bl kvmppc_check_need_tlb_flush | |
2940ba0c PM |
626 | nop |
627 | ld r5, HSTATE_KVM_VCORE(r13) | |
1b400ba0 | 628 | |
93b0f4dc PM |
629 | /* Add timebase offset onto timebase */ |
630 | 22: ld r8,VCORE_TB_OFFSET(r5) | |
631 | cmpdi r8,0 | |
632 | beq 37f | |
57b8daa7 | 633 | std r8, VCORE_TB_OFFSET_APPL(r5) |
93b0f4dc PM |
634 | mftb r6 /* current host timebase */ |
635 | add r8,r8,r6 | |
636 | mtspr SPRN_TBU40,r8 /* update upper 40 bits */ | |
637 | mftb r7 /* check if lower 24 bits overflowed */ | |
638 | clrldi r6,r6,40 | |
639 | clrldi r7,r7,40 | |
640 | cmpld r7,r6 | |
641 | bge 37f | |
642 | addis r8,r8,0x100 /* if so, increment upper 40 bits */ | |
643 | mtspr SPRN_TBU40,r8 | |
644 | ||
388cc6e1 PM |
645 | /* Load guest PCR value to select appropriate compat mode */ |
646 | 37: ld r7, VCORE_PCR(r5) | |
647 | cmpdi r7, 0 | |
648 | beq 38f | |
649 | mtspr SPRN_PCR, r7 | |
650 | 38: | |
b005255e MN |
651 | |
652 | BEGIN_FTR_SECTION | |
88b02cf9 | 653 | /* DPDES and VTB are shared between threads */ |
b005255e | 654 | ld r8, VCORE_DPDES(r5) |
88b02cf9 | 655 | ld r7, VCORE_VTB(r5) |
b005255e | 656 | mtspr SPRN_DPDES, r8 |
88b02cf9 | 657 | mtspr SPRN_VTB, r7 |
b005255e MN |
658 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) |
659 | ||
fd7bacbc MS |
660 | /* Mark the subcore state as inside guest */ |
661 | bl kvmppc_subcore_enter_guest | |
662 | nop | |
663 | ld r5, HSTATE_KVM_VCORE(r13) | |
664 | ld r4, HSTATE_KVM_VCPU(r13) | |
388cc6e1 | 665 | li r0,1 |
371fefd6 | 666 | stb r0,VCORE_IN_GUEST(r5) /* signal secondaries to continue */ |
9e368f29 | 667 | |
e0b7ec05 | 668 | /* Do we have a guest vcpu to run? */ |
6af27c84 | 669 | 10: cmpdi r4, 0 |
e0b7ec05 PM |
670 | beq kvmppc_primary_no_guest |
671 | kvmppc_got_guest: | |
e0b7ec05 PM |
672 | /* Increment yield count if they have a VPA */ |
673 | ld r3, VCPU_VPA(r4) | |
674 | cmpdi r3, 0 | |
675 | beq 25f | |
0865a583 AG |
676 | li r6, LPPACA_YIELDCOUNT |
677 | LWZX_BE r5, r3, r6 | |
e0b7ec05 | 678 | addi r5, r5, 1 |
0865a583 | 679 | STWX_BE r5, r3, r6 |
e0b7ec05 PM |
680 | li r6, 1 |
681 | stb r6, VCPU_VPA_DIRTY(r4) | |
682 | 25: | |
683 | ||
e0b7ec05 PM |
684 | /* Save purr/spurr */ |
685 | mfspr r5,SPRN_PURR | |
686 | mfspr r6,SPRN_SPURR | |
687 | std r5,HSTATE_PURR(r13) | |
688 | std r6,HSTATE_SPURR(r13) | |
689 | ld r7,VCPU_PURR(r4) | |
690 | ld r8,VCPU_SPURR(r4) | |
691 | mtspr SPRN_PURR,r7 | |
692 | mtspr SPRN_SPURR,r8 | |
e0b7ec05 | 693 | |
e9cf1e08 PM |
694 | /* Save host values of some registers */ |
695 | BEGIN_FTR_SECTION | |
696 | mfspr r5, SPRN_TIDR | |
697 | mfspr r6, SPRN_PSSCR | |
f4c51f84 | 698 | mfspr r7, SPRN_PID |
e9cf1e08 PM |
699 | std r5, STACK_SLOT_TID(r1) |
700 | std r6, STACK_SLOT_PSSCR(r1) | |
f4c51f84 | 701 | std r7, STACK_SLOT_PID(r1) |
769377f7 PM |
702 | mfspr r5, SPRN_HFSCR |
703 | std r5, STACK_SLOT_HFSCR(r1) | |
e9cf1e08 | 704 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) |
7ceaa6dc PM |
705 | BEGIN_FTR_SECTION |
706 | mfspr r5, SPRN_CIABR | |
707 | mfspr r6, SPRN_DAWR | |
708 | mfspr r7, SPRN_DAWRX | |
c3c7470c | 709 | mfspr r8, SPRN_IAMR |
7ceaa6dc PM |
710 | std r5, STACK_SLOT_CIABR(r1) |
711 | std r6, STACK_SLOT_DAWR(r1) | |
712 | std r7, STACK_SLOT_DAWRX(r1) | |
c3c7470c | 713 | std r8, STACK_SLOT_IAMR(r1) |
7ceaa6dc | 714 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) |
e9cf1e08 | 715 | |
c3c7470c ME |
716 | mfspr r5, SPRN_AMR |
717 | std r5, STACK_SLOT_AMR(r1) | |
718 | mfspr r6, SPRN_UAMOR | |
719 | std r6, STACK_SLOT_UAMOR(r1) | |
720 | ||
e0b7ec05 PM |
721 | BEGIN_FTR_SECTION |
722 | /* Set partition DABR */ | |
723 | /* Do this before re-enabling PMU to avoid P7 DABR corruption bug */ | |
8563bf52 | 724 | lwz r5,VCPU_DABRX(r4) |
e0b7ec05 PM |
725 | ld r6,VCPU_DABR(r4) |
726 | mtspr SPRN_DABRX,r5 | |
727 | mtspr SPRN_DABR,r6 | |
e0b7ec05 | 728 | isync |
e0b7ec05 PM |
729 | END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) |
730 | ||
e4e38121 | 731 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
4bb3c7a0 PM |
732 | /* |
733 | * Branch around the call if both CPU_FTR_TM and | |
734 | * CPU_FTR_P9_TM_HV_ASSIST are off. | |
735 | */ | |
e4e38121 | 736 | BEGIN_FTR_SECTION |
4bb3c7a0 PM |
737 | b 91f |
738 | END_FTR_SECTION(CPU_FTR_TM | CPU_FTR_P9_TM_HV_ASSIST, 0) | |
67f8a8c1 | 739 | /* |
7854f754 | 740 | * NOTE THAT THIS TRASHES ALL NON-VOLATILE REGISTERS (but not CR) |
67f8a8c1 | 741 | */ |
6f597c6b SG |
742 | mr r3, r4 |
743 | ld r4, VCPU_MSR(r3) | |
7854f754 | 744 | li r5, 0 /* don't preserve non-vol regs */ |
7b0e827c | 745 | bl kvmppc_restore_tm_hv |
7854f754 | 746 | nop |
6f597c6b | 747 | ld r4, HSTATE_KVM_VCPU(r13) |
4bb3c7a0 | 748 | 91: |
e4e38121 MN |
749 | #endif |
750 | ||
41f4e631 PM |
751 | /* Load guest PMU registers; r4 = vcpu pointer here */ |
752 | mr r3, r4 | |
753 | bl kvmhv_load_guest_pmu | |
e0b7ec05 PM |
754 | |
755 | /* Load up FP, VMX and VSX registers */ | |
41f4e631 | 756 | ld r4, HSTATE_KVM_VCPU(r13) |
e0b7ec05 PM |
757 | bl kvmppc_load_fp |
758 | ||
759 | ld r14, VCPU_GPR(R14)(r4) | |
760 | ld r15, VCPU_GPR(R15)(r4) | |
761 | ld r16, VCPU_GPR(R16)(r4) | |
762 | ld r17, VCPU_GPR(R17)(r4) | |
763 | ld r18, VCPU_GPR(R18)(r4) | |
764 | ld r19, VCPU_GPR(R19)(r4) | |
765 | ld r20, VCPU_GPR(R20)(r4) | |
766 | ld r21, VCPU_GPR(R21)(r4) | |
767 | ld r22, VCPU_GPR(R22)(r4) | |
768 | ld r23, VCPU_GPR(R23)(r4) | |
769 | ld r24, VCPU_GPR(R24)(r4) | |
770 | ld r25, VCPU_GPR(R25)(r4) | |
771 | ld r26, VCPU_GPR(R26)(r4) | |
772 | ld r27, VCPU_GPR(R27)(r4) | |
773 | ld r28, VCPU_GPR(R28)(r4) | |
774 | ld r29, VCPU_GPR(R29)(r4) | |
775 | ld r30, VCPU_GPR(R30)(r4) | |
776 | ld r31, VCPU_GPR(R31)(r4) | |
777 | ||
e0b7ec05 PM |
778 | /* Switch DSCR to guest value */ |
779 | ld r5, VCPU_DSCR(r4) | |
780 | mtspr SPRN_DSCR, r5 | |
e0b7ec05 | 781 | |
b005255e | 782 | BEGIN_FTR_SECTION |
c17b98cf | 783 | /* Skip next section on POWER7 */ |
b005255e MN |
784 | b 8f |
785 | END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) | |
b005255e MN |
786 | /* Load up POWER8-specific registers */ |
787 | ld r5, VCPU_IAMR(r4) | |
788 | lwz r6, VCPU_PSPB(r4) | |
789 | ld r7, VCPU_FSCR(r4) | |
790 | mtspr SPRN_IAMR, r5 | |
791 | mtspr SPRN_PSPB, r6 | |
792 | mtspr SPRN_FSCR, r7 | |
b53221e7 MN |
793 | /* |
794 | * Handle broken DAWR case by not writing it. This means we | |
795 | * can still store the DAWR register for migration. | |
796 | */ | |
c1fe190c MN |
797 | LOAD_REG_ADDR(r5, dawr_force_enable) |
798 | lbz r5, 0(r5) | |
799 | cmpdi r5, 0 | |
800 | beq 1f | |
801 | ld r5, VCPU_DAWR(r4) | |
802 | ld r6, VCPU_DAWRX(r4) | |
b005255e MN |
803 | mtspr SPRN_DAWR, r5 |
804 | mtspr SPRN_DAWRX, r6 | |
c1fe190c MN |
805 | 1: |
806 | ld r7, VCPU_CIABR(r4) | |
807 | ld r8, VCPU_TAR(r4) | |
b005255e MN |
808 | mtspr SPRN_CIABR, r7 |
809 | mtspr SPRN_TAR, r8 | |
810 | ld r5, VCPU_IC(r4) | |
7b490411 | 811 | ld r8, VCPU_EBBHR(r4) |
88b02cf9 | 812 | mtspr SPRN_IC, r5 |
b005255e MN |
813 | mtspr SPRN_EBBHR, r8 |
814 | ld r5, VCPU_EBBRR(r4) | |
815 | ld r6, VCPU_BESCR(r4) | |
83677f55 PM |
816 | lwz r7, VCPU_GUEST_PID(r4) |
817 | ld r8, VCPU_WORT(r4) | |
b005255e MN |
818 | mtspr SPRN_EBBRR, r5 |
819 | mtspr SPRN_BESCR, r6 | |
83677f55 PM |
820 | mtspr SPRN_PID, r7 |
821 | mtspr SPRN_WORT, r8 | |
822 | BEGIN_FTR_SECTION | |
e9cf1e08 | 823 | /* POWER8-only registers */ |
b005255e MN |
824 | ld r5, VCPU_TCSCR(r4) |
825 | ld r6, VCPU_ACOP(r4) | |
83677f55 PM |
826 | ld r7, VCPU_CSIGR(r4) |
827 | ld r8, VCPU_TACR(r4) | |
b005255e MN |
828 | mtspr SPRN_TCSCR, r5 |
829 | mtspr SPRN_ACOP, r6 | |
83677f55 PM |
830 | mtspr SPRN_CSIGR, r7 |
831 | mtspr SPRN_TACR, r8 | |
4bb3c7a0 | 832 | nop |
e9cf1e08 PM |
833 | FTR_SECTION_ELSE |
834 | /* POWER9-only registers */ | |
835 | ld r5, VCPU_TID(r4) | |
836 | ld r6, VCPU_PSSCR(r4) | |
4bb3c7a0 | 837 | lbz r8, HSTATE_FAKE_SUSPEND(r13) |
e9cf1e08 | 838 | oris r6, r6, PSSCR_EC@h /* This makes stop trap to HV */ |
4bb3c7a0 | 839 | rldimi r6, r8, PSSCR_FAKE_SUSPEND_LG, 63 - PSSCR_FAKE_SUSPEND_LG |
769377f7 | 840 | ld r7, VCPU_HFSCR(r4) |
e9cf1e08 PM |
841 | mtspr SPRN_TIDR, r5 |
842 | mtspr SPRN_PSSCR, r6 | |
769377f7 | 843 | mtspr SPRN_HFSCR, r7 |
e9cf1e08 | 844 | ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_300) |
b005255e MN |
845 | 8: |
846 | ||
e0b7ec05 PM |
847 | ld r5, VCPU_SPRG0(r4) |
848 | ld r6, VCPU_SPRG1(r4) | |
849 | ld r7, VCPU_SPRG2(r4) | |
850 | ld r8, VCPU_SPRG3(r4) | |
851 | mtspr SPRN_SPRG0, r5 | |
852 | mtspr SPRN_SPRG1, r6 | |
853 | mtspr SPRN_SPRG2, r7 | |
854 | mtspr SPRN_SPRG3, r8 | |
855 | ||
856 | /* Load up DAR and DSISR */ | |
857 | ld r5, VCPU_DAR(r4) | |
858 | lwz r6, VCPU_DSISR(r4) | |
859 | mtspr SPRN_DAR, r5 | |
860 | mtspr SPRN_DSISR, r6 | |
861 | ||
e0b7ec05 PM |
862 | /* Restore AMR and UAMOR, set AMOR to all 1s */ |
863 | ld r5,VCPU_AMR(r4) | |
864 | ld r6,VCPU_UAMOR(r4) | |
865 | li r7,-1 | |
866 | mtspr SPRN_AMR,r5 | |
867 | mtspr SPRN_UAMOR,r6 | |
868 | mtspr SPRN_AMOR,r7 | |
de56a948 PM |
869 | |
870 | /* Restore state of CTRL run bit; assume 1 on entry */ | |
871 | lwz r5,VCPU_CTRL(r4) | |
872 | andi. r5,r5,1 | |
873 | bne 4f | |
874 | mfspr r6,SPRN_CTRLF | |
875 | clrrdi r6,r6,1 | |
876 | mtspr SPRN_CTRLT,r6 | |
877 | 4: | |
6af27c84 PM |
878 | /* Secondary threads wait for primary to have done partition switch */ |
879 | ld r5, HSTATE_KVM_VCORE(r13) | |
880 | lbz r6, HSTATE_PTID(r13) | |
881 | cmpwi r6, 0 | |
882 | beq 21f | |
883 | lbz r0, VCORE_IN_GUEST(r5) | |
884 | cmpwi r0, 0 | |
885 | bne 21f | |
886 | HMT_LOW | |
b4deba5c PM |
887 | 20: lwz r3, VCORE_ENTRY_EXIT(r5) |
888 | cmpwi r3, 0x100 | |
889 | bge no_switch_exit | |
890 | lbz r0, VCORE_IN_GUEST(r5) | |
6af27c84 PM |
891 | cmpwi r0, 0 |
892 | beq 20b | |
893 | HMT_MEDIUM | |
894 | 21: | |
895 | /* Set LPCR. */ | |
896 | ld r8,VCORE_LPCR(r5) | |
897 | mtspr SPRN_LPCR,r8 | |
898 | isync | |
899 | ||
57b8daa7 PM |
900 | /* |
901 | * Set the decrementer to the guest decrementer. | |
902 | */ | |
903 | ld r8,VCPU_DEC_EXPIRES(r4) | |
904 | /* r8 is a host timebase value here, convert to guest TB */ | |
905 | ld r5,HSTATE_KVM_VCORE(r13) | |
906 | ld r6,VCORE_TB_OFFSET_APPL(r5) | |
907 | add r8,r8,r6 | |
908 | mftb r7 | |
909 | subf r3,r7,r8 | |
910 | mtspr SPRN_DEC,r3 | |
911 | ||
6af27c84 PM |
912 | /* Check if HDEC expires soon */ |
913 | mfspr r3, SPRN_HDEC | |
2f272463 PM |
914 | EXTEND_HDEC(r3) |
915 | cmpdi r3, 512 /* 1 microsecond */ | |
6af27c84 PM |
916 | blt hdec_soon |
917 | ||
6964e6a4 PM |
918 | /* For hash guest, clear out and reload the SLB */ |
919 | ld r6, VCPU_KVM(r4) | |
920 | lbz r0, KVM_RADIX(r6) | |
921 | cmpwi r0, 0 | |
922 | bne 9f | |
923 | li r6, 0 | |
924 | slbmte r6, r6 | |
925 | slbia | |
926 | ptesync | |
927 | ||
928 | /* Load up guest SLB entries (N.B. slb_max will be 0 for radix) */ | |
929 | lwz r5,VCPU_SLB_MAX(r4) | |
930 | cmpwi r5,0 | |
931 | beq 9f | |
932 | mtctr r5 | |
933 | addi r6,r4,VCPU_SLB | |
934 | 1: ld r8,VCPU_SLB_E(r6) | |
935 | ld r9,VCPU_SLB_V(r6) | |
936 | slbmte r9,r8 | |
937 | addi r6,r6,VCPU_SLB_SIZE | |
938 | bdnz 1b | |
939 | 9: | |
940 | ||
5af50993 BH |
941 | #ifdef CONFIG_KVM_XICS |
942 | /* We are entering the guest on that thread, push VCPU to XIVE */ | |
5af50993 BH |
943 | ld r11, VCPU_XIVE_SAVED_STATE(r4) |
944 | li r9, TM_QW1_OS | |
7ae9bda7 | 945 | lwz r8, VCPU_XIVE_CAM_WORD(r4) |
8d4ba9c9 PM |
946 | cmpwi r8, 0 |
947 | beq no_xive | |
7ae9bda7 SJS |
948 | li r7, TM_QW1_OS + TM_WORD2 |
949 | mfmsr r0 | |
950 | andi. r0, r0, MSR_DR /* in real mode? */ | |
951 | beq 2f | |
952 | ld r10, HSTATE_XIVE_TIMA_VIRT(r13) | |
953 | cmpldi cr1, r10, 0 | |
954 | beq cr1, no_xive | |
955 | eieio | |
956 | stdx r11,r9,r10 | |
957 | stwx r8,r7,r10 | |
958 | b 3f | |
959 | 2: ld r10, HSTATE_XIVE_TIMA_PHYS(r13) | |
960 | cmpldi cr1, r10, 0 | |
961 | beq cr1, no_xive | |
5af50993 | 962 | eieio |
ad98dd1a | 963 | stdcix r11,r9,r10 |
7ae9bda7 SJS |
964 | stwcix r8,r7,r10 |
965 | 3: li r9, 1 | |
35c2405e | 966 | stb r9, VCPU_XIVE_PUSHED(r4) |
ad98dd1a | 967 | eieio |
2267ea76 BH |
968 | |
969 | /* | |
970 | * We clear the irq_pending flag. There is a small chance of a | |
971 | * race vs. the escalation interrupt happening on another | |
972 | * processor setting it again, but the only consequence is to | |
973 | * cause a spurrious wakeup on the next H_CEDE which is not an | |
974 | * issue. | |
975 | */ | |
976 | li r0,0 | |
977 | stb r0, VCPU_IRQ_PENDING(r4) | |
9b9b13a6 BH |
978 | |
979 | /* | |
980 | * In single escalation mode, if the escalation interrupt is | |
981 | * on, we mask it. | |
982 | */ | |
983 | lbz r0, VCPU_XIVE_ESC_ON(r4) | |
7ae9bda7 SJS |
984 | cmpwi cr1, r0,0 |
985 | beq cr1, 1f | |
9b9b13a6 | 986 | li r9, XIVE_ESB_SET_PQ_01 |
7ae9bda7 SJS |
987 | beq 4f /* in real mode? */ |
988 | ld r10, VCPU_XIVE_ESC_VADDR(r4) | |
989 | ldx r0, r10, r9 | |
990 | b 5f | |
991 | 4: ld r10, VCPU_XIVE_ESC_RADDR(r4) | |
9b9b13a6 | 992 | ldcix r0, r10, r9 |
7ae9bda7 | 993 | 5: sync |
9b9b13a6 BH |
994 | |
995 | /* We have a possible subtle race here: The escalation interrupt might | |
996 | * have fired and be on its way to the host queue while we mask it, | |
997 | * and if we unmask it early enough (re-cede right away), there is | |
998 | * a theorical possibility that it fires again, thus landing in the | |
999 | * target queue more than once which is a big no-no. | |
1000 | * | |
1001 | * Fortunately, solving this is rather easy. If the above load setting | |
1002 | * PQ to 01 returns a previous value where P is set, then we know the | |
1003 | * escalation interrupt is somewhere on its way to the host. In that | |
1004 | * case we simply don't clear the xive_esc_on flag below. It will be | |
1005 | * eventually cleared by the handler for the escalation interrupt. | |
1006 | * | |
1007 | * Then, when doing a cede, we check that flag again before re-enabling | |
1008 | * the escalation interrupt, and if set, we abort the cede. | |
1009 | */ | |
1010 | andi. r0, r0, XIVE_ESB_VAL_P | |
1011 | bne- 1f | |
1012 | ||
1013 | /* Now P is 0, we can clear the flag */ | |
1014 | li r0, 0 | |
1015 | stb r0, VCPU_XIVE_ESC_ON(r4) | |
1016 | 1: | |
5af50993 BH |
1017 | no_xive: |
1018 | #endif /* CONFIG_KVM_XICS */ | |
1019 | ||
95a6432c PM |
1020 | li r0, 0 |
1021 | stw r0, STACK_SLOT_SHORT_PATH(r1) | |
1022 | ||
df709a29 | 1023 | deliver_guest_interrupt: /* r4 = vcpu, r13 = paca */ |
f7035ce9 PM |
1024 | /* Check if we can deliver an external or decrementer interrupt now */ |
1025 | ld r0, VCPU_PENDING_EXC(r4) | |
1026 | BEGIN_FTR_SECTION | |
1027 | /* On POWER9, also check for emulated doorbell interrupt */ | |
1028 | lbz r3, VCPU_DBELL_REQ(r4) | |
1029 | or r0, r0, r3 | |
1030 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) | |
1031 | cmpdi r0, 0 | |
1032 | beq 71f | |
1033 | mr r3, r4 | |
1034 | bl kvmppc_guest_entry_inject_int | |
1035 | ld r4, HSTATE_KVM_VCPU(r13) | |
1036 | 71: | |
de56a948 PM |
1037 | ld r6, VCPU_SRR0(r4) |
1038 | ld r7, VCPU_SRR1(r4) | |
e3bbbbfa PM |
1039 | mtspr SPRN_SRR0, r6 |
1040 | mtspr SPRN_SRR1, r7 | |
de56a948 | 1041 | |
95a6432c PM |
1042 | fast_guest_entry_c: |
1043 | ld r10, VCPU_PC(r4) | |
1044 | ld r11, VCPU_MSR(r4) | |
4619ac88 | 1045 | /* r11 = vcpu->arch.msr & ~MSR_HV */ |
de56a948 PM |
1046 | rldicl r11, r11, 63 - MSR_HV_LG, 1 |
1047 | rotldi r11, r11, 1 + MSR_HV_LG | |
1048 | ori r11, r11, MSR_ME | |
1049 | ||
f7035ce9 PM |
1050 | ld r6, VCPU_CTR(r4) |
1051 | ld r7, VCPU_XER(r4) | |
1052 | mtctr r6 | |
1053 | mtxer r7 | |
19ccb76a | 1054 | |
27025a60 LPF |
1055 | /* |
1056 | * Required state: | |
1057 | * R4 = vcpu | |
1058 | * R10: value for HSRR0 | |
1059 | * R11: value for HSRR1 | |
1060 | * R13 = PACA | |
1061 | */ | |
de56a948 | 1062 | fast_guest_return: |
4619ac88 PM |
1063 | li r0,0 |
1064 | stb r0,VCPU_CEDED(r4) /* cancel cede */ | |
de56a948 PM |
1065 | mtspr SPRN_HSRR0,r10 |
1066 | mtspr SPRN_HSRR1,r11 | |
1067 | ||
1068 | /* Activate guest mode, so faults get handled by KVM */ | |
44a3add8 | 1069 | li r9, KVM_GUEST_MODE_GUEST_HV |
de56a948 PM |
1070 | stb r9, HSTATE_IN_GUEST(r13) |
1071 | ||
b6c295df PM |
1072 | #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING |
1073 | /* Accumulate timing */ | |
1074 | addi r3, r4, VCPU_TB_GUEST | |
1075 | bl kvmhv_accumulate_time | |
1076 | #endif | |
1077 | ||
de56a948 PM |
1078 | /* Enter guest */ |
1079 | ||
0acb9111 PM |
1080 | BEGIN_FTR_SECTION |
1081 | ld r5, VCPU_CFAR(r4) | |
1082 | mtspr SPRN_CFAR, r5 | |
1083 | END_FTR_SECTION_IFSET(CPU_FTR_CFAR) | |
4b8473c9 PM |
1084 | BEGIN_FTR_SECTION |
1085 | ld r0, VCPU_PPR(r4) | |
1086 | END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) | |
0acb9111 | 1087 | |
de56a948 | 1088 | ld r5, VCPU_LR(r4) |
de56a948 | 1089 | mtlr r5 |
de56a948 | 1090 | |
c75df6f9 | 1091 | ld r1, VCPU_GPR(R1)(r4) |
c75df6f9 | 1092 | ld r5, VCPU_GPR(R5)(r4) |
c75df6f9 MN |
1093 | ld r8, VCPU_GPR(R8)(r4) |
1094 | ld r9, VCPU_GPR(R9)(r4) | |
1095 | ld r10, VCPU_GPR(R10)(r4) | |
1096 | ld r11, VCPU_GPR(R11)(r4) | |
1097 | ld r12, VCPU_GPR(R12)(r4) | |
1098 | ld r13, VCPU_GPR(R13)(r4) | |
1099 | ||
4b8473c9 PM |
1100 | BEGIN_FTR_SECTION |
1101 | mtspr SPRN_PPR, r0 | |
1102 | END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) | |
e001fa78 MN |
1103 | |
1104 | /* Move canary into DSISR to check for later */ | |
1105 | BEGIN_FTR_SECTION | |
1106 | li r0, 0x7fff | |
1107 | mtspr SPRN_HDSISR, r0 | |
1108 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) | |
1109 | ||
6c85b7bc SB |
1110 | ld r6, VCPU_KVM(r4) |
1111 | lbz r7, KVM_SECURE_GUEST(r6) | |
1112 | cmpdi r7, 0 | |
1113 | ld r6, VCPU_GPR(R6)(r4) | |
1114 | ld r7, VCPU_GPR(R7)(r4) | |
1115 | bne ret_to_ultra | |
1116 | ||
1117 | lwz r0, VCPU_CR(r4) | |
1118 | mtcr r0 | |
1119 | ||
4b8473c9 | 1120 | ld r0, VCPU_GPR(R0)(r4) |
6c85b7bc SB |
1121 | ld r2, VCPU_GPR(R2)(r4) |
1122 | ld r3, VCPU_GPR(R3)(r4) | |
c75df6f9 | 1123 | ld r4, VCPU_GPR(R4)(r4) |
222f20f1 | 1124 | HRFI_TO_GUEST |
de56a948 | 1125 | b . |
6c85b7bc SB |
1126 | /* |
1127 | * Use UV_RETURN ultracall to return control back to the Ultravisor after | |
1128 | * processing an hypercall or interrupt that was forwarded (a.k.a. reflected) | |
1129 | * to the Hypervisor. | |
1130 | * | |
1131 | * All registers have already been loaded, except: | |
1132 | * R0 = hcall result | |
1133 | * R2 = SRR1, so UV can detect a synthesized interrupt (if any) | |
1134 | * R3 = UV_RETURN | |
1135 | */ | |
1136 | ret_to_ultra: | |
1137 | lwz r0, VCPU_CR(r4) | |
1138 | mtcr r0 | |
1139 | ||
1140 | ld r0, VCPU_GPR(R3)(r4) | |
1141 | mfspr r2, SPRN_SRR1 | |
1142 | li r3, 0 | |
1143 | ori r3, r3, UV_RETURN | |
1144 | ld r4, VCPU_GPR(R4)(r4) | |
1145 | sc 2 | |
de56a948 | 1146 | |
95a6432c PM |
1147 | /* |
1148 | * Enter the guest on a P9 or later system where we have exactly | |
1149 | * one vcpu per vcore and we don't need to go to real mode | |
1150 | * (which implies that host and guest are both using radix MMU mode). | |
1151 | * r3 = vcpu pointer | |
1152 | * Most SPRs and all the VSRs have been loaded already. | |
1153 | */ | |
1154 | _GLOBAL(__kvmhv_vcpu_entry_p9) | |
1155 | EXPORT_SYMBOL_GPL(__kvmhv_vcpu_entry_p9) | |
1156 | mflr r0 | |
1157 | std r0, PPC_LR_STKOFF(r1) | |
1158 | stdu r1, -SFS(r1) | |
1159 | ||
1160 | li r0, 1 | |
1161 | stw r0, STACK_SLOT_SHORT_PATH(r1) | |
1162 | ||
1163 | std r3, HSTATE_KVM_VCPU(r13) | |
1164 | mfcr r4 | |
1165 | stw r4, SFS+8(r1) | |
1166 | ||
1167 | std r1, HSTATE_HOST_R1(r13) | |
1168 | ||
1169 | reg = 14 | |
1170 | .rept 18 | |
1171 | std reg, STACK_SLOT_NVGPRS + ((reg - 14) * 8)(r1) | |
1172 | reg = reg + 1 | |
1173 | .endr | |
1174 | ||
1175 | reg = 14 | |
1176 | .rept 18 | |
1177 | ld reg, __VCPU_GPR(reg)(r3) | |
1178 | reg = reg + 1 | |
1179 | .endr | |
1180 | ||
1181 | mfmsr r10 | |
1182 | std r10, HSTATE_HOST_MSR(r13) | |
1183 | ||
1184 | mr r4, r3 | |
1185 | b fast_guest_entry_c | |
1186 | guest_exit_short_path: | |
1187 | ||
1188 | li r0, KVM_GUEST_MODE_NONE | |
1189 | stb r0, HSTATE_IN_GUEST(r13) | |
1190 | ||
1191 | reg = 14 | |
1192 | .rept 18 | |
1193 | std reg, __VCPU_GPR(reg)(r9) | |
1194 | reg = reg + 1 | |
1195 | .endr | |
1196 | ||
1197 | reg = 14 | |
1198 | .rept 18 | |
1199 | ld reg, STACK_SLOT_NVGPRS + ((reg - 14) * 8)(r1) | |
1200 | reg = reg + 1 | |
1201 | .endr | |
1202 | ||
1203 | lwz r4, SFS+8(r1) | |
1204 | mtcr r4 | |
1205 | ||
1206 | mr r3, r12 /* trap number */ | |
1207 | ||
1208 | addi r1, r1, SFS | |
1209 | ld r0, PPC_LR_STKOFF(r1) | |
1210 | mtlr r0 | |
1211 | ||
1212 | /* If we are in real mode, do a rfid to get back to the caller */ | |
1213 | mfmsr r4 | |
1214 | andi. r5, r4, MSR_IR | |
1215 | bnelr | |
1216 | rldicl r5, r4, 64 - MSR_TS_S_LG, 62 /* extract TS field */ | |
1217 | mtspr SPRN_SRR0, r0 | |
1218 | ld r10, HSTATE_HOST_MSR(r13) | |
1219 | rldimi r10, r5, MSR_TS_S_LG, 63 - MSR_TS_T_LG | |
1220 | mtspr SPRN_SRR1, r10 | |
1221 | RFI_TO_KERNEL | |
1222 | b . | |
1223 | ||
b6c295df | 1224 | secondary_too_late: |
6af27c84 | 1225 | li r12, 0 |
a8b48a4d | 1226 | stw r12, STACK_SLOT_TRAP(r1) |
b6c295df PM |
1227 | cmpdi r4, 0 |
1228 | beq 11f | |
6af27c84 PM |
1229 | stw r12, VCPU_TRAP(r4) |
1230 | #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING | |
b6c295df PM |
1231 | addi r3, r4, VCPU_TB_RMEXIT |
1232 | bl kvmhv_accumulate_time | |
6af27c84 | 1233 | #endif |
b6c295df PM |
1234 | 11: b kvmhv_switch_to_host |
1235 | ||
b4deba5c PM |
1236 | no_switch_exit: |
1237 | HMT_MEDIUM | |
1238 | li r12, 0 | |
1239 | b 12f | |
b6c295df | 1240 | hdec_soon: |
6af27c84 | 1241 | li r12, BOOK3S_INTERRUPT_HV_DECREMENTER |
b4deba5c | 1242 | 12: stw r12, VCPU_TRAP(r4) |
6af27c84 PM |
1243 | mr r9, r4 |
1244 | #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING | |
b6c295df PM |
1245 | addi r3, r4, VCPU_TB_RMEXIT |
1246 | bl kvmhv_accumulate_time | |
b6c295df | 1247 | #endif |
6964e6a4 | 1248 | b guest_bypass |
b6c295df | 1249 | |
de56a948 PM |
1250 | /****************************************************************************** |
1251 | * * | |
1252 | * Exit code * | |
1253 | * * | |
1254 | *****************************************************************************/ | |
1255 | ||
1256 | /* | |
1257 | * We come here from the first-level interrupt handlers. | |
1258 | */ | |
dd96b2c2 AK |
1259 | .globl kvmppc_interrupt_hv |
1260 | kvmppc_interrupt_hv: | |
de56a948 PM |
1261 | /* |
1262 | * Register contents: | |
d3918e7f | 1263 | * R12 = (guest CR << 32) | interrupt vector |
de56a948 | 1264 | * R13 = PACA |
d3918e7f | 1265 | * guest R12 saved in shadow VCPU SCRATCH0 |
a97a65d5 | 1266 | * guest CTR saved in shadow VCPU SCRATCH1 if RELOCATABLE |
de56a948 PM |
1267 | * guest R13 saved in SPRN_SCRATCH0 |
1268 | */ | |
a97a65d5 | 1269 | std r9, HSTATE_SCRATCH2(r13) |
44a3add8 PM |
1270 | lbz r9, HSTATE_IN_GUEST(r13) |
1271 | cmpwi r9, KVM_GUEST_MODE_HOST_HV | |
1272 | beq kvmppc_bad_host_intr | |
dd96b2c2 AK |
1273 | #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE |
1274 | cmpwi r9, KVM_GUEST_MODE_GUEST | |
a97a65d5 | 1275 | ld r9, HSTATE_SCRATCH2(r13) |
dd96b2c2 AK |
1276 | beq kvmppc_interrupt_pr |
1277 | #endif | |
44a3add8 PM |
1278 | /* We're now back in the host but in guest MMU context */ |
1279 | li r9, KVM_GUEST_MODE_HOST_HV | |
1280 | stb r9, HSTATE_IN_GUEST(r13) | |
1281 | ||
de56a948 PM |
1282 | ld r9, HSTATE_KVM_VCPU(r13) |
1283 | ||
1284 | /* Save registers */ | |
1285 | ||
c75df6f9 MN |
1286 | std r0, VCPU_GPR(R0)(r9) |
1287 | std r1, VCPU_GPR(R1)(r9) | |
1288 | std r2, VCPU_GPR(R2)(r9) | |
1289 | std r3, VCPU_GPR(R3)(r9) | |
1290 | std r4, VCPU_GPR(R4)(r9) | |
1291 | std r5, VCPU_GPR(R5)(r9) | |
1292 | std r6, VCPU_GPR(R6)(r9) | |
1293 | std r7, VCPU_GPR(R7)(r9) | |
1294 | std r8, VCPU_GPR(R8)(r9) | |
a97a65d5 | 1295 | ld r0, HSTATE_SCRATCH2(r13) |
c75df6f9 MN |
1296 | std r0, VCPU_GPR(R9)(r9) |
1297 | std r10, VCPU_GPR(R10)(r9) | |
1298 | std r11, VCPU_GPR(R11)(r9) | |
de56a948 | 1299 | ld r3, HSTATE_SCRATCH0(r13) |
c75df6f9 | 1300 | std r3, VCPU_GPR(R12)(r9) |
d3918e7f NP |
1301 | /* CR is in the high half of r12 */ |
1302 | srdi r4, r12, 32 | |
fd0944ba | 1303 | std r4, VCPU_CR(r9) |
0acb9111 PM |
1304 | BEGIN_FTR_SECTION |
1305 | ld r3, HSTATE_CFAR(r13) | |
1306 | std r3, VCPU_CFAR(r9) | |
1307 | END_FTR_SECTION_IFSET(CPU_FTR_CFAR) | |
4b8473c9 PM |
1308 | BEGIN_FTR_SECTION |
1309 | ld r4, HSTATE_PPR(r13) | |
1310 | std r4, VCPU_PPR(r9) | |
1311 | END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) | |
de56a948 PM |
1312 | |
1313 | /* Restore R1/R2 so we can handle faults */ | |
1314 | ld r1, HSTATE_HOST_R1(r13) | |
1315 | ld r2, PACATOC(r13) | |
1316 | ||
1317 | mfspr r10, SPRN_SRR0 | |
1318 | mfspr r11, SPRN_SRR1 | |
1319 | std r10, VCPU_SRR0(r9) | |
1320 | std r11, VCPU_SRR1(r9) | |
d3918e7f NP |
1321 | /* trap is in the low half of r12, clear CR from the high half */ |
1322 | clrldi r12, r12, 32 | |
de56a948 PM |
1323 | andi. r0, r12, 2 /* need to read HSRR0/1? */ |
1324 | beq 1f | |
1325 | mfspr r10, SPRN_HSRR0 | |
1326 | mfspr r11, SPRN_HSRR1 | |
1327 | clrrdi r12, r12, 2 | |
1328 | 1: std r10, VCPU_PC(r9) | |
1329 | std r11, VCPU_MSR(r9) | |
1330 | ||
1331 | GET_SCRATCH0(r3) | |
1332 | mflr r4 | |
c75df6f9 | 1333 | std r3, VCPU_GPR(R13)(r9) |
de56a948 PM |
1334 | std r4, VCPU_LR(r9) |
1335 | ||
de56a948 PM |
1336 | stw r12,VCPU_TRAP(r9) |
1337 | ||
8b24e69f PM |
1338 | /* |
1339 | * Now that we have saved away SRR0/1 and HSRR0/1, | |
1340 | * interrupts are recoverable in principle, so set MSR_RI. | |
1341 | * This becomes important for relocation-on interrupts from | |
1342 | * the guest, which we can get in radix mode on POWER9. | |
1343 | */ | |
1344 | li r0, MSR_RI | |
1345 | mtmsrd r0, 1 | |
1346 | ||
b6c295df PM |
1347 | #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING |
1348 | addi r3, r9, VCPU_TB_RMINTR | |
1349 | mr r4, r9 | |
1350 | bl kvmhv_accumulate_time | |
1351 | ld r5, VCPU_GPR(R5)(r9) | |
1352 | ld r6, VCPU_GPR(R6)(r9) | |
1353 | ld r7, VCPU_GPR(R7)(r9) | |
1354 | ld r8, VCPU_GPR(R8)(r9) | |
1355 | #endif | |
1356 | ||
4a157d61 | 1357 | /* Save HEIR (HV emulation assist reg) in emul_inst |
697d3899 PM |
1358 | if this is an HEI (HV emulation interrupt, e40) */ |
1359 | li r3,KVM_INST_FETCH_FAILED | |
2bf27601 | 1360 | stw r3,VCPU_LAST_INST(r9) |
697d3899 PM |
1361 | cmpwi r12,BOOK3S_INTERRUPT_H_EMUL_ASSIST |
1362 | bne 11f | |
1363 | mfspr r3,SPRN_HEIR | |
4a157d61 | 1364 | 11: stw r3,VCPU_HEIR(r9) |
697d3899 PM |
1365 | |
1366 | /* these are volatile across C function calls */ | |
a97a65d5 NP |
1367 | #ifdef CONFIG_RELOCATABLE |
1368 | ld r3, HSTATE_SCRATCH1(r13) | |
1369 | mtctr r3 | |
1370 | #else | |
697d3899 | 1371 | mfctr r3 |
a97a65d5 | 1372 | #endif |
697d3899 PM |
1373 | mfxer r4 |
1374 | std r3, VCPU_CTR(r9) | |
c63517c2 | 1375 | std r4, VCPU_XER(r9) |
697d3899 | 1376 | |
df709a29 PM |
1377 | /* Save more register state */ |
1378 | mfdar r3 | |
1379 | mfdsisr r4 | |
1380 | std r3, VCPU_DAR(r9) | |
1381 | stw r4, VCPU_DSISR(r9) | |
4bb3c7a0 | 1382 | |
697d3899 PM |
1383 | /* If this is a page table miss then see if it's theirs or ours */ |
1384 | cmpwi r12, BOOK3S_INTERRUPT_H_DATA_STORAGE | |
1385 | beq kvmppc_hdsi | |
df709a29 PM |
1386 | std r3, VCPU_FAULT_DAR(r9) |
1387 | stw r4, VCPU_FAULT_DSISR(r9) | |
342d3db7 PM |
1388 | cmpwi r12, BOOK3S_INTERRUPT_H_INST_STORAGE |
1389 | beq kvmppc_hisi | |
697d3899 | 1390 | |
df709a29 PM |
1391 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
1392 | /* For softpatch interrupt, go off and do TM instruction emulation */ | |
1393 | cmpwi r12, BOOK3S_INTERRUPT_HV_SOFTPATCH | |
1394 | beq kvmppc_tm_emul | |
1395 | #endif | |
1396 | ||
de56a948 PM |
1397 | /* See if this is a leftover HDEC interrupt */ |
1398 | cmpwi r12,BOOK3S_INTERRUPT_HV_DECREMENTER | |
1399 | bne 2f | |
1400 | mfspr r3,SPRN_HDEC | |
a4faf2e7 PM |
1401 | EXTEND_HDEC(r3) |
1402 | cmpdi r3,0 | |
1f09c3ed PM |
1403 | mr r4,r9 |
1404 | bge fast_guest_return | |
de56a948 | 1405 | 2: |
697d3899 | 1406 | /* See if this is an hcall we can handle in real mode */ |
a8606e20 PM |
1407 | cmpwi r12,BOOK3S_INTERRUPT_SYSCALL |
1408 | beq hcall_try_real_mode | |
de56a948 | 1409 | |
66feed61 PM |
1410 | /* Hypervisor doorbell - exit only if host IPI flag set */ |
1411 | cmpwi r12, BOOK3S_INTERRUPT_H_DOORBELL | |
1412 | bne 3f | |
bd0fdb19 NP |
1413 | BEGIN_FTR_SECTION |
1414 | PPC_MSGSYNC | |
2cde3716 | 1415 | lwsync |
360cae31 PM |
1416 | /* always exit if we're running a nested guest */ |
1417 | ld r0, VCPU_NESTED(r9) | |
1418 | cmpdi r0, 0 | |
1419 | bne guest_exit_cont | |
bd0fdb19 | 1420 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) |
66feed61 | 1421 | lbz r0, HSTATE_HOST_IPI(r13) |
06554d9f | 1422 | cmpwi r0, 0 |
df709a29 | 1423 | beq maybe_reenter_guest |
66feed61 PM |
1424 | b guest_exit_cont |
1425 | 3: | |
769377f7 PM |
1426 | /* If it's a hypervisor facility unavailable interrupt, save HFSCR */ |
1427 | cmpwi r12, BOOK3S_INTERRUPT_H_FAC_UNAVAIL | |
1428 | bne 14f | |
1429 | mfspr r3, SPRN_HFSCR | |
1430 | std r3, VCPU_HFSCR(r9) | |
1431 | b guest_exit_cont | |
1432 | 14: | |
54695c30 BH |
1433 | /* External interrupt ? */ |
1434 | cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL | |
df709a29 | 1435 | beq kvmppc_guest_external |
43ff3f65 PM |
1436 | /* See if it is a machine check */ |
1437 | cmpwi r12, BOOK3S_INTERRUPT_MACHINE_CHECK | |
1438 | beq machine_check_realmode | |
df709a29 PM |
1439 | /* Or a hypervisor maintenance interrupt */ |
1440 | cmpwi r12, BOOK3S_INTERRUPT_HMI | |
1441 | beq hmi_realmode | |
1442 | ||
1443 | guest_exit_cont: /* r9 = vcpu, r12 = trap, r13 = paca */ | |
1444 | ||
43ff3f65 PM |
1445 | #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING |
1446 | addi r3, r9, VCPU_TB_RMEXIT | |
1447 | mr r4, r9 | |
1448 | bl kvmhv_accumulate_time | |
1449 | #endif | |
5af50993 BH |
1450 | #ifdef CONFIG_KVM_XICS |
1451 | /* We are exiting, pull the VP from the XIVE */ | |
35c2405e | 1452 | lbz r0, VCPU_XIVE_PUSHED(r9) |
5af50993 BH |
1453 | cmpwi cr0, r0, 0 |
1454 | beq 1f | |
1455 | li r7, TM_SPC_PULL_OS_CTX | |
1456 | li r6, TM_QW1_OS | |
1457 | mfmsr r0 | |
2662efd0 | 1458 | andi. r0, r0, MSR_DR /* in real mode? */ |
5af50993 BH |
1459 | beq 2f |
1460 | ld r10, HSTATE_XIVE_TIMA_VIRT(r13) | |
1461 | cmpldi cr0, r10, 0 | |
1462 | beq 1f | |
1463 | /* First load to pull the context, we ignore the value */ | |
5af50993 | 1464 | eieio |
ad98dd1a | 1465 | lwzx r11, r7, r10 |
5af50993 BH |
1466 | /* Second load to recover the context state (Words 0 and 1) */ |
1467 | ldx r11, r6, r10 | |
1468 | b 3f | |
1469 | 2: ld r10, HSTATE_XIVE_TIMA_PHYS(r13) | |
1470 | cmpldi cr0, r10, 0 | |
1471 | beq 1f | |
1472 | /* First load to pull the context, we ignore the value */ | |
5af50993 | 1473 | eieio |
ad98dd1a | 1474 | lwzcix r11, r7, r10 |
5af50993 BH |
1475 | /* Second load to recover the context state (Words 0 and 1) */ |
1476 | ldcix r11, r6, r10 | |
1477 | 3: std r11, VCPU_XIVE_SAVED_STATE(r9) | |
1478 | /* Fixup some of the state for the next load */ | |
1479 | li r10, 0 | |
1480 | li r0, 0xff | |
35c2405e | 1481 | stb r10, VCPU_XIVE_PUSHED(r9) |
5af50993 BH |
1482 | stb r10, (VCPU_XIVE_SAVED_STATE+3)(r9) |
1483 | stb r0, (VCPU_XIVE_SAVED_STATE+4)(r9) | |
ad98dd1a | 1484 | eieio |
5af50993 BH |
1485 | 1: |
1486 | #endif /* CONFIG_KVM_XICS */ | |
de56a948 | 1487 | |
95a6432c PM |
1488 | /* If we came in through the P9 short path, go back out to C now */ |
1489 | lwz r0, STACK_SLOT_SHORT_PATH(r1) | |
1490 | cmpwi r0, 0 | |
1491 | bne guest_exit_short_path | |
1492 | ||
6964e6a4 | 1493 | /* For hash guest, read the guest SLB and save it away */ |
f4c51f84 PM |
1494 | ld r5, VCPU_KVM(r9) |
1495 | lbz r0, KVM_RADIX(r5) | |
f4c51f84 | 1496 | li r5, 0 |
6964e6a4 PM |
1497 | cmpwi r0, 0 |
1498 | bne 3f /* for radix, save 0 entries */ | |
de56a948 PM |
1499 | lwz r0,VCPU_SLB_NR(r9) /* number of entries in SLB */ |
1500 | mtctr r0 | |
1501 | li r6,0 | |
1502 | addi r7,r9,VCPU_SLB | |
de56a948 PM |
1503 | 1: slbmfee r8,r6 |
1504 | andis. r0,r8,SLB_ESID_V@h | |
1505 | beq 2f | |
1506 | add r8,r8,r6 /* put index in */ | |
1507 | slbmfev r3,r6 | |
1508 | std r8,VCPU_SLB_E(r7) | |
1509 | std r3,VCPU_SLB_V(r7) | |
1510 | addi r7,r7,VCPU_SLB_SIZE | |
1511 | addi r5,r5,1 | |
1512 | 2: addi r6,r6,1 | |
1513 | bdnz 1b | |
6964e6a4 PM |
1514 | /* Finally clear out the SLB */ |
1515 | li r0,0 | |
1516 | slbmte r0,r0 | |
1517 | slbia | |
1518 | ptesync | |
f4c51f84 | 1519 | 3: stw r5,VCPU_SLB_MAX(r9) |
b4072df4 | 1520 | |
cda4a147 PM |
1521 | /* load host SLB entries */ |
1522 | BEGIN_MMU_FTR_SECTION | |
1523 | b 0f | |
1524 | END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_RADIX) | |
1525 | ld r8,PACA_SLBSHADOWPTR(r13) | |
1526 | ||
1527 | .rept SLB_NUM_BOLTED | |
1528 | li r3, SLBSHADOW_SAVEAREA | |
1529 | LDX_BE r5, r8, r3 | |
1530 | addi r3, r3, 8 | |
1531 | LDX_BE r6, r8, r3 | |
1532 | andis. r7,r5,SLB_ESID_V@h | |
1533 | beq 1f | |
1534 | slbmte r6,r5 | |
1535 | 1: addi r8,r8,16 | |
1536 | .endr | |
1537 | 0: | |
1538 | ||
6964e6a4 | 1539 | guest_bypass: |
a8b48a4d | 1540 | stw r12, STACK_SLOT_TRAP(r1) |
57b8daa7 PM |
1541 | |
1542 | /* Save DEC */ | |
1543 | /* Do this before kvmhv_commence_exit so we know TB is guest TB */ | |
1544 | ld r3, HSTATE_KVM_VCORE(r13) | |
1545 | mfspr r5,SPRN_DEC | |
1546 | mftb r6 | |
1547 | /* On P9, if the guest has large decr enabled, don't sign extend */ | |
1548 | BEGIN_FTR_SECTION | |
1549 | ld r4, VCORE_LPCR(r3) | |
1550 | andis. r4, r4, LPCR_LD@h | |
1551 | bne 16f | |
1552 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) | |
1553 | extsw r5,r5 | |
1554 | 16: add r5,r5,r6 | |
1555 | /* r5 is a guest timebase value here, convert to host TB */ | |
1556 | ld r4,VCORE_TB_OFFSET_APPL(r3) | |
1557 | subf r5,r4,r5 | |
1558 | std r5,VCPU_DEC_EXPIRES(r9) | |
1559 | ||
6af27c84 | 1560 | /* Increment exit count, poke other threads to exit */ |
57b8daa7 | 1561 | mr r3, r12 |
6af27c84 | 1562 | bl kvmhv_commence_exit |
eddb60fb PM |
1563 | nop |
1564 | ld r9, HSTATE_KVM_VCPU(r13) | |
6af27c84 | 1565 | |
ec257165 PM |
1566 | /* Stop others sending VCPU interrupts to this physical CPU */ |
1567 | li r0, -1 | |
1568 | stw r0, VCPU_CPU(r9) | |
1569 | stw r0, VCPU_THREAD_CPU(r9) | |
1570 | ||
de56a948 | 1571 | /* Save guest CTRL register, set runlatch to 1 */ |
6af27c84 | 1572 | mfspr r6,SPRN_CTRLF |
de56a948 PM |
1573 | stw r6,VCPU_CTRL(r9) |
1574 | andi. r0,r6,1 | |
1575 | bne 4f | |
1576 | ori r6,r6,1 | |
1577 | mtspr SPRN_CTRLT,r6 | |
1578 | 4: | |
de56a948 PM |
1579 | /* |
1580 | * Save the guest PURR/SPURR | |
1581 | */ | |
1582 | mfspr r5,SPRN_PURR | |
1583 | mfspr r6,SPRN_SPURR | |
1584 | ld r7,VCPU_PURR(r9) | |
1585 | ld r8,VCPU_SPURR(r9) | |
1586 | std r5,VCPU_PURR(r9) | |
1587 | std r6,VCPU_SPURR(r9) | |
1588 | subf r5,r7,r5 | |
1589 | subf r6,r8,r6 | |
1590 | ||
1591 | /* | |
1592 | * Restore host PURR/SPURR and add guest times | |
1593 | * so that the time in the guest gets accounted. | |
1594 | */ | |
1595 | ld r3,HSTATE_PURR(r13) | |
1596 | ld r4,HSTATE_SPURR(r13) | |
1597 | add r3,r3,r5 | |
1598 | add r4,r4,r6 | |
1599 | mtspr SPRN_PURR,r3 | |
1600 | mtspr SPRN_SPURR,r4 | |
1601 | ||
b005255e MN |
1602 | BEGIN_FTR_SECTION |
1603 | b 8f | |
1604 | END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) | |
b005255e MN |
1605 | /* Save POWER8-specific registers */ |
1606 | mfspr r5, SPRN_IAMR | |
1607 | mfspr r6, SPRN_PSPB | |
1608 | mfspr r7, SPRN_FSCR | |
1609 | std r5, VCPU_IAMR(r9) | |
1610 | stw r6, VCPU_PSPB(r9) | |
1611 | std r7, VCPU_FSCR(r9) | |
1612 | mfspr r5, SPRN_IC | |
b005255e MN |
1613 | mfspr r7, SPRN_TAR |
1614 | std r5, VCPU_IC(r9) | |
b005255e | 1615 | std r7, VCPU_TAR(r9) |
7b490411 | 1616 | mfspr r8, SPRN_EBBHR |
b005255e MN |
1617 | std r8, VCPU_EBBHR(r9) |
1618 | mfspr r5, SPRN_EBBRR | |
1619 | mfspr r6, SPRN_BESCR | |
83677f55 PM |
1620 | mfspr r7, SPRN_PID |
1621 | mfspr r8, SPRN_WORT | |
b005255e MN |
1622 | std r5, VCPU_EBBRR(r9) |
1623 | std r6, VCPU_BESCR(r9) | |
83677f55 PM |
1624 | stw r7, VCPU_GUEST_PID(r9) |
1625 | std r8, VCPU_WORT(r9) | |
1626 | BEGIN_FTR_SECTION | |
b005255e MN |
1627 | mfspr r5, SPRN_TCSCR |
1628 | mfspr r6, SPRN_ACOP | |
83677f55 PM |
1629 | mfspr r7, SPRN_CSIGR |
1630 | mfspr r8, SPRN_TACR | |
b005255e MN |
1631 | std r5, VCPU_TCSCR(r9) |
1632 | std r6, VCPU_ACOP(r9) | |
83677f55 PM |
1633 | std r7, VCPU_CSIGR(r9) |
1634 | std r8, VCPU_TACR(r9) | |
e9cf1e08 PM |
1635 | FTR_SECTION_ELSE |
1636 | mfspr r5, SPRN_TIDR | |
1637 | mfspr r6, SPRN_PSSCR | |
1638 | std r5, VCPU_TID(r9) | |
1639 | rldicl r6, r6, 4, 50 /* r6 &= PSSCR_GUEST_VIS */ | |
1640 | rotldi r6, r6, 60 | |
1641 | std r6, VCPU_PSSCR(r9) | |
769377f7 PM |
1642 | /* Restore host HFSCR value */ |
1643 | ld r7, STACK_SLOT_HFSCR(r1) | |
1644 | mtspr SPRN_HFSCR, r7 | |
e9cf1e08 | 1645 | ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_300) |
ccec4456 PM |
1646 | /* |
1647 | * Restore various registers to 0, where non-zero values | |
1648 | * set by the guest could disrupt the host. | |
1649 | */ | |
1650 | li r0, 0 | |
4c3bb4cc | 1651 | mtspr SPRN_PSPB, r0 |
ccec4456 | 1652 | mtspr SPRN_WORT, r0 |
83677f55 PM |
1653 | BEGIN_FTR_SECTION |
1654 | mtspr SPRN_TCSCR, r0 | |
ccec4456 PM |
1655 | /* Set MMCRS to 1<<31 to freeze and disable the SPMC counters */ |
1656 | li r0, 1 | |
1657 | sldi r0, r0, 31 | |
1658 | mtspr SPRN_MMCRS, r0 | |
83677f55 | 1659 | END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300) |
b005255e | 1660 | |
c3c7470c ME |
1661 | /* Save and restore AMR, IAMR and UAMOR before turning on the MMU */ |
1662 | ld r8, STACK_SLOT_IAMR(r1) | |
1663 | mtspr SPRN_IAMR, r8 | |
1664 | ||
1665 | 8: /* Power7 jumps back in here */ | |
e0b7ec05 PM |
1666 | mfspr r5,SPRN_AMR |
1667 | mfspr r6,SPRN_UAMOR | |
1668 | std r5,VCPU_AMR(r9) | |
1669 | std r6,VCPU_UAMOR(r9) | |
c3c7470c ME |
1670 | ld r5,STACK_SLOT_AMR(r1) |
1671 | ld r6,STACK_SLOT_UAMOR(r1) | |
1672 | mtspr SPRN_AMR, r5 | |
4c3bb4cc | 1673 | mtspr SPRN_UAMOR, r6 |
e0b7ec05 PM |
1674 | |
1675 | /* Switch DSCR back to host value */ | |
e0b7ec05 PM |
1676 | mfspr r8, SPRN_DSCR |
1677 | ld r7, HSTATE_DSCR(r13) | |
1678 | std r8, VCPU_DSCR(r9) | |
1679 | mtspr SPRN_DSCR, r7 | |
e0b7ec05 PM |
1680 | |
1681 | /* Save non-volatile GPRs */ | |
1682 | std r14, VCPU_GPR(R14)(r9) | |
1683 | std r15, VCPU_GPR(R15)(r9) | |
1684 | std r16, VCPU_GPR(R16)(r9) | |
1685 | std r17, VCPU_GPR(R17)(r9) | |
1686 | std r18, VCPU_GPR(R18)(r9) | |
1687 | std r19, VCPU_GPR(R19)(r9) | |
1688 | std r20, VCPU_GPR(R20)(r9) | |
1689 | std r21, VCPU_GPR(R21)(r9) | |
1690 | std r22, VCPU_GPR(R22)(r9) | |
1691 | std r23, VCPU_GPR(R23)(r9) | |
1692 | std r24, VCPU_GPR(R24)(r9) | |
1693 | std r25, VCPU_GPR(R25)(r9) | |
1694 | std r26, VCPU_GPR(R26)(r9) | |
1695 | std r27, VCPU_GPR(R27)(r9) | |
1696 | std r28, VCPU_GPR(R28)(r9) | |
1697 | std r29, VCPU_GPR(R29)(r9) | |
1698 | std r30, VCPU_GPR(R30)(r9) | |
1699 | std r31, VCPU_GPR(R31)(r9) | |
1700 | ||
1701 | /* Save SPRGs */ | |
1702 | mfspr r3, SPRN_SPRG0 | |
1703 | mfspr r4, SPRN_SPRG1 | |
1704 | mfspr r5, SPRN_SPRG2 | |
1705 | mfspr r6, SPRN_SPRG3 | |
1706 | std r3, VCPU_SPRG0(r9) | |
1707 | std r4, VCPU_SPRG1(r9) | |
1708 | std r5, VCPU_SPRG2(r9) | |
1709 | std r6, VCPU_SPRG3(r9) | |
1710 | ||
1711 | /* save FP state */ | |
1712 | mr r3, r9 | |
1713 | bl kvmppc_save_fp | |
de56a948 | 1714 | |
0a8eccef | 1715 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
4bb3c7a0 PM |
1716 | /* |
1717 | * Branch around the call if both CPU_FTR_TM and | |
1718 | * CPU_FTR_P9_TM_HV_ASSIST are off. | |
1719 | */ | |
0a8eccef | 1720 | BEGIN_FTR_SECTION |
4bb3c7a0 PM |
1721 | b 91f |
1722 | END_FTR_SECTION(CPU_FTR_TM | CPU_FTR_P9_TM_HV_ASSIST, 0) | |
67f8a8c1 | 1723 | /* |
7854f754 | 1724 | * NOTE THAT THIS TRASHES ALL NON-VOLATILE REGISTERS (but not CR) |
67f8a8c1 | 1725 | */ |
6f597c6b SG |
1726 | mr r3, r9 |
1727 | ld r4, VCPU_MSR(r3) | |
7854f754 | 1728 | li r5, 0 /* don't preserve non-vol regs */ |
7b0e827c | 1729 | bl kvmppc_save_tm_hv |
7854f754 | 1730 | nop |
6f597c6b | 1731 | ld r9, HSTATE_KVM_VCPU(r13) |
4bb3c7a0 | 1732 | 91: |
0a8eccef PM |
1733 | #endif |
1734 | ||
e0b7ec05 PM |
1735 | /* Increment yield count if they have a VPA */ |
1736 | ld r8, VCPU_VPA(r9) /* do they have a VPA? */ | |
1737 | cmpdi r8, 0 | |
1738 | beq 25f | |
0865a583 AG |
1739 | li r4, LPPACA_YIELDCOUNT |
1740 | LWZX_BE r3, r8, r4 | |
e0b7ec05 | 1741 | addi r3, r3, 1 |
0865a583 | 1742 | STWX_BE r3, r8, r4 |
e0b7ec05 PM |
1743 | li r3, 1 |
1744 | stb r3, VCPU_VPA_DIRTY(r9) | |
1745 | 25: | |
1746 | /* Save PMU registers if requested */ | |
1747 | /* r8 and cr0.eq are live here */ | |
41f4e631 PM |
1748 | mr r3, r9 |
1749 | li r4, 1 | |
e0b7ec05 | 1750 | beq 21f /* if no VPA, save PMU stuff anyway */ |
41f4e631 PM |
1751 | lbz r4, LPPACA_PMCINUSE(r8) |
1752 | 21: bl kvmhv_save_guest_pmu | |
1753 | ld r9, HSTATE_KVM_VCPU(r13) | |
de56a948 | 1754 | |
e9cf1e08 | 1755 | /* Restore host values of some registers */ |
7ceaa6dc PM |
1756 | BEGIN_FTR_SECTION |
1757 | ld r5, STACK_SLOT_CIABR(r1) | |
1758 | ld r6, STACK_SLOT_DAWR(r1) | |
1759 | ld r7, STACK_SLOT_DAWRX(r1) | |
1760 | mtspr SPRN_CIABR, r5 | |
b53221e7 MN |
1761 | /* |
1762 | * If the DAWR doesn't work, it's ok to write these here as | |
1763 | * this value should always be zero | |
1764 | */ | |
7ceaa6dc PM |
1765 | mtspr SPRN_DAWR, r6 |
1766 | mtspr SPRN_DAWRX, r7 | |
1767 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) | |
e9cf1e08 PM |
1768 | BEGIN_FTR_SECTION |
1769 | ld r5, STACK_SLOT_TID(r1) | |
1770 | ld r6, STACK_SLOT_PSSCR(r1) | |
f4c51f84 | 1771 | ld r7, STACK_SLOT_PID(r1) |
e9cf1e08 PM |
1772 | mtspr SPRN_TIDR, r5 |
1773 | mtspr SPRN_PSSCR, r6 | |
f4c51f84 | 1774 | mtspr SPRN_PID, r7 |
e9cf1e08 | 1775 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) |
a25bd72b BH |
1776 | |
1777 | #ifdef CONFIG_PPC_RADIX_MMU | |
1778 | /* | |
1779 | * Are we running hash or radix ? | |
1780 | */ | |
67f8a8c1 PM |
1781 | ld r5, VCPU_KVM(r9) |
1782 | lbz r0, KVM_RADIX(r5) | |
1783 | cmpwi cr2, r0, 0 | |
2bf1071a | 1784 | beq cr2, 2f |
a25bd72b | 1785 | |
df158189 PM |
1786 | /* |
1787 | * Radix: do eieio; tlbsync; ptesync sequence in case we | |
1788 | * interrupted the guest between a tlbie and a ptesync. | |
1789 | */ | |
1790 | eieio | |
1791 | tlbsync | |
1792 | ptesync | |
1793 | ||
a25bd72b BH |
1794 | /* Radix: Handle the case where the guest used an illegal PID */ |
1795 | LOAD_REG_ADDR(r4, mmu_base_pid) | |
1796 | lwz r3, VCPU_GUEST_PID(r9) | |
1797 | lwz r5, 0(r4) | |
1798 | cmpw cr0,r3,r5 | |
1799 | blt 2f | |
1800 | ||
1801 | /* | |
1802 | * Illegal PID, the HW might have prefetched and cached in the TLB | |
1803 | * some translations for the LPID 0 / guest PID combination which | |
1804 | * Linux doesn't know about, so we need to flush that PID out of | |
1805 | * the TLB. First we need to set LPIDR to 0 so tlbiel applies to | |
1806 | * the right context. | |
1807 | */ | |
1808 | li r0,0 | |
1809 | mtspr SPRN_LPID,r0 | |
1810 | isync | |
1811 | ||
1812 | /* Then do a congruence class local flush */ | |
1813 | ld r6,VCPU_KVM(r9) | |
1814 | lwz r0,KVM_TLB_SETS(r6) | |
1815 | mtctr r0 | |
1816 | li r7,0x400 /* IS field = 0b01 */ | |
1817 | ptesync | |
1818 | sldi r0,r3,32 /* RS has PID */ | |
1819 | 1: PPC_TLBIEL(7,0,2,1,1) /* RIC=2, PRS=1, R=1 */ | |
1820 | addi r7,r7,0x1000 | |
1821 | bdnz 1b | |
1822 | ptesync | |
1823 | ||
2bf1071a | 1824 | 2: |
a25bd72b | 1825 | #endif /* CONFIG_PPC_RADIX_MMU */ |
e9cf1e08 | 1826 | |
9e368f29 | 1827 | /* |
c17b98cf | 1828 | * POWER7/POWER8 guest -> host partition switch code. |
9e368f29 PM |
1829 | * We don't have to lock against tlbies but we do |
1830 | * have to coordinate the hardware threads. | |
a8b48a4d | 1831 | * Here STACK_SLOT_TRAP(r1) contains the trap number. |
9e368f29 | 1832 | */ |
b6c295df | 1833 | kvmhv_switch_to_host: |
371fefd6 | 1834 | /* Secondary threads wait for primary to do partition switch */ |
6af27c84 | 1835 | ld r5,HSTATE_KVM_VCORE(r13) |
e0b7ec05 PM |
1836 | ld r4,VCORE_KVM(r5) /* pointer to struct kvm */ |
1837 | lbz r3,HSTATE_PTID(r13) | |
371fefd6 PM |
1838 | cmpwi r3,0 |
1839 | beq 15f | |
1840 | HMT_LOW | |
1841 | 13: lbz r3,VCORE_IN_GUEST(r5) | |
1842 | cmpwi r3,0 | |
1843 | bne 13b | |
1844 | HMT_MEDIUM | |
1845 | b 16f | |
1846 | ||
1847 | /* Primary thread waits for all the secondaries to exit guest */ | |
1848 | 15: lwz r3,VCORE_ENTRY_EXIT(r5) | |
b4deba5c | 1849 | rlwinm r0,r3,32-8,0xff |
371fefd6 PM |
1850 | clrldi r3,r3,56 |
1851 | cmpw r3,r0 | |
1852 | bne 15b | |
1853 | isync | |
1854 | ||
b4deba5c PM |
1855 | /* Did we actually switch to the guest at all? */ |
1856 | lbz r6, VCORE_IN_GUEST(r5) | |
1857 | cmpwi r6, 0 | |
1858 | beq 19f | |
1859 | ||
371fefd6 | 1860 | /* Primary thread switches back to host partition */ |
de56a948 | 1861 | lwz r7,KVM_HOST_LPID(r4) |
7a84084c PM |
1862 | BEGIN_FTR_SECTION |
1863 | ld r6,KVM_HOST_SDR1(r4) | |
de56a948 PM |
1864 | li r8,LPID_RSVD /* switch to reserved LPID */ |
1865 | mtspr SPRN_LPID,r8 | |
1866 | ptesync | |
7a84084c PM |
1867 | mtspr SPRN_SDR1,r6 /* switch to host page table */ |
1868 | END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300) | |
de56a948 PM |
1869 | mtspr SPRN_LPID,r7 |
1870 | isync | |
93b0f4dc | 1871 | |
b005255e | 1872 | BEGIN_FTR_SECTION |
88b02cf9 | 1873 | /* DPDES and VTB are shared between threads */ |
b005255e | 1874 | mfspr r7, SPRN_DPDES |
88b02cf9 | 1875 | mfspr r8, SPRN_VTB |
b005255e | 1876 | std r7, VCORE_DPDES(r5) |
88b02cf9 | 1877 | std r8, VCORE_VTB(r5) |
b005255e MN |
1878 | /* clear DPDES so we don't get guest doorbells in the host */ |
1879 | li r8, 0 | |
1880 | mtspr SPRN_DPDES, r8 | |
1881 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) | |
1882 | ||
93b0f4dc | 1883 | /* Subtract timebase offset from timebase */ |
57b8daa7 | 1884 | ld r8, VCORE_TB_OFFSET_APPL(r5) |
93b0f4dc PM |
1885 | cmpdi r8,0 |
1886 | beq 17f | |
57b8daa7 PM |
1887 | li r0, 0 |
1888 | std r0, VCORE_TB_OFFSET_APPL(r5) | |
c5fb80d3 | 1889 | mftb r6 /* current guest timebase */ |
93b0f4dc PM |
1890 | subf r8,r8,r6 |
1891 | mtspr SPRN_TBU40,r8 /* update upper 40 bits */ | |
1892 | mftb r7 /* check if lower 24 bits overflowed */ | |
1893 | clrldi r6,r6,40 | |
1894 | clrldi r7,r7,40 | |
1895 | cmpld r7,r6 | |
1896 | bge 17f | |
1897 | addis r8,r8,0x100 /* if so, increment upper 40 bits */ | |
1898 | mtspr SPRN_TBU40,r8 | |
1899 | ||
df709a29 PM |
1900 | 17: |
1901 | /* | |
1902 | * If this is an HMI, we called kvmppc_realmode_hmi_handler | |
1903 | * above, which may or may not have already called | |
1904 | * kvmppc_subcore_exit_guest. Fortunately, all that | |
1905 | * kvmppc_subcore_exit_guest does is clear a flag, so calling | |
1906 | * it again here is benign even if kvmppc_realmode_hmi_handler | |
1907 | * has already called it. | |
1908 | */ | |
1909 | bl kvmppc_subcore_exit_guest | |
fd7bacbc MS |
1910 | nop |
1911 | 30: ld r5,HSTATE_KVM_VCORE(r13) | |
1912 | ld r4,VCORE_KVM(r5) /* pointer to struct kvm */ | |
1913 | ||
388cc6e1 | 1914 | /* Reset PCR */ |
fd7bacbc | 1915 | ld r0, VCORE_PCR(r5) |
388cc6e1 PM |
1916 | cmpdi r0, 0 |
1917 | beq 18f | |
1918 | li r0, 0 | |
1919 | mtspr SPRN_PCR, r0 | |
1920 | 18: | |
93b0f4dc | 1921 | /* Signal secondary CPUs to continue */ |
371fefd6 | 1922 | stb r0,VCORE_IN_GUEST(r5) |
b4deba5c | 1923 | 19: lis r8,0x7fff /* MAX_INT@h */ |
de56a948 PM |
1924 | mtspr SPRN_HDEC,r8 |
1925 | ||
c0101509 PM |
1926 | 16: |
1927 | BEGIN_FTR_SECTION | |
1928 | /* On POWER9 with HPT-on-radix we need to wait for all other threads */ | |
1929 | ld r3, HSTATE_SPLIT_MODE(r13) | |
1930 | cmpdi r3, 0 | |
1931 | beq 47f | |
1932 | lwz r8, KVM_SPLIT_DO_RESTORE(r3) | |
1933 | cmpwi r8, 0 | |
1934 | beq 47f | |
c0101509 PM |
1935 | bl kvmhv_p9_restore_lpcr |
1936 | nop | |
c0101509 PM |
1937 | b 48f |
1938 | 47: | |
1939 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) | |
1940 | ld r8,KVM_HOST_LPCR(r4) | |
de56a948 PM |
1941 | mtspr SPRN_LPCR,r8 |
1942 | isync | |
c0101509 | 1943 | 48: |
b6c295df PM |
1944 | #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING |
1945 | /* Finish timing, if we have a vcpu */ | |
1946 | ld r4, HSTATE_KVM_VCPU(r13) | |
1947 | cmpdi r4, 0 | |
1948 | li r3, 0 | |
1949 | beq 2f | |
1950 | bl kvmhv_accumulate_time | |
1951 | 2: | |
1952 | #endif | |
44a3add8 PM |
1953 | /* Unset guest mode */ |
1954 | li r0, KVM_GUEST_MODE_NONE | |
1955 | stb r0, HSTATE_IN_GUEST(r13) | |
1956 | ||
a8b48a4d | 1957 | lwz r12, STACK_SLOT_TRAP(r1) /* return trap # in r12 */ |
7ceaa6dc PM |
1958 | ld r0, SFS+PPC_LR_STKOFF(r1) |
1959 | addi r1, r1, SFS | |
218309b7 PM |
1960 | mtlr r0 |
1961 | blr | |
b4072df4 | 1962 | |
df709a29 PM |
1963 | kvmppc_guest_external: |
1964 | /* External interrupt, first check for host_ipi. If this is | |
1965 | * set, we know the host wants us out so let's do it now | |
1966 | */ | |
1967 | bl kvmppc_read_intr | |
1968 | ||
1969 | /* | |
1970 | * Restore the active volatile registers after returning from | |
1971 | * a C function. | |
1972 | */ | |
1973 | ld r9, HSTATE_KVM_VCPU(r13) | |
1974 | li r12, BOOK3S_INTERRUPT_EXTERNAL | |
1975 | ||
1976 | /* | |
1977 | * kvmppc_read_intr return codes: | |
1978 | * | |
1979 | * Exit to host (r3 > 0) | |
1980 | * 1 An interrupt is pending that needs to be handled by the host | |
1981 | * Exit guest and return to host by branching to guest_exit_cont | |
1982 | * | |
1983 | * 2 Passthrough that needs completion in the host | |
1984 | * Exit guest and return to host by branching to guest_exit_cont | |
1985 | * However, we also set r12 to BOOK3S_INTERRUPT_HV_RM_HARD | |
1986 | * to indicate to the host to complete handling the interrupt | |
1987 | * | |
1988 | * Before returning to guest, we check if any CPU is heading out | |
1989 | * to the host and if so, we head out also. If no CPUs are heading | |
1990 | * check return values <= 0. | |
1991 | * | |
1992 | * Return to guest (r3 <= 0) | |
1993 | * 0 No external interrupt is pending | |
1994 | * -1 A guest wakeup IPI (which has now been cleared) | |
1995 | * In either case, we return to guest to deliver any pending | |
1996 | * guest interrupts. | |
1997 | * | |
1998 | * -2 A PCI passthrough external interrupt was handled | |
1999 | * (interrupt was delivered directly to guest) | |
2000 | * Return to guest to deliver any pending guest interrupts. | |
2001 | */ | |
2002 | ||
2003 | cmpdi r3, 1 | |
2004 | ble 1f | |
2005 | ||
2006 | /* Return code = 2 */ | |
2007 | li r12, BOOK3S_INTERRUPT_HV_RM_HARD | |
2008 | stw r12, VCPU_TRAP(r9) | |
2009 | b guest_exit_cont | |
2010 | ||
2011 | 1: /* Return code <= 1 */ | |
2012 | cmpdi r3, 0 | |
2013 | bgt guest_exit_cont | |
2014 | ||
2015 | /* Return code <= 0 */ | |
2016 | maybe_reenter_guest: | |
2017 | ld r5, HSTATE_KVM_VCORE(r13) | |
2018 | lwz r0, VCORE_ENTRY_EXIT(r5) | |
2019 | cmpwi r0, 0x100 | |
2020 | mr r4, r9 | |
2021 | blt deliver_guest_interrupt | |
2022 | b guest_exit_cont | |
2023 | ||
4bb3c7a0 PM |
2024 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
2025 | /* | |
2026 | * Softpatch interrupt for transactional memory emulation cases | |
2027 | * on POWER9 DD2.2. This is early in the guest exit path - we | |
2028 | * haven't saved registers or done a treclaim yet. | |
2029 | */ | |
2030 | kvmppc_tm_emul: | |
2031 | /* Save instruction image in HEIR */ | |
2032 | mfspr r3, SPRN_HEIR | |
2033 | stw r3, VCPU_HEIR(r9) | |
2034 | ||
2035 | /* | |
2036 | * The cases we want to handle here are those where the guest | |
2037 | * is in real suspend mode and is trying to transition to | |
2038 | * transactional mode. | |
2039 | */ | |
2040 | lbz r0, HSTATE_FAKE_SUSPEND(r13) | |
2041 | cmpwi r0, 0 /* keep exiting guest if in fake suspend */ | |
2042 | bne guest_exit_cont | |
2043 | rldicl r3, r11, 64 - MSR_TS_S_LG, 62 | |
2044 | cmpwi r3, 1 /* or if not in suspend state */ | |
2045 | bne guest_exit_cont | |
2046 | ||
2047 | /* Call C code to do the emulation */ | |
2048 | mr r3, r9 | |
2049 | bl kvmhv_p9_tm_emulation_early | |
2050 | nop | |
2051 | ld r9, HSTATE_KVM_VCPU(r13) | |
2052 | li r12, BOOK3S_INTERRUPT_HV_SOFTPATCH | |
2053 | cmpwi r3, 0 | |
2054 | beq guest_exit_cont /* continue exiting if not handled */ | |
2055 | ld r10, VCPU_PC(r9) | |
2056 | ld r11, VCPU_MSR(r9) | |
2057 | b fast_interrupt_c_return /* go back to guest if handled */ | |
2058 | #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ | |
2059 | ||
697d3899 PM |
2060 | /* |
2061 | * Check whether an HDSI is an HPTE not found fault or something else. | |
2062 | * If it is an HPTE not found fault that is due to the guest accessing | |
2063 | * a page that they have mapped but which we have paged out, then | |
2064 | * we continue on with the guest exit path. In all other cases, | |
2065 | * reflect the HDSI to the guest as a DSI. | |
2066 | */ | |
2067 | kvmppc_hdsi: | |
f4c51f84 PM |
2068 | ld r3, VCPU_KVM(r9) |
2069 | lbz r0, KVM_RADIX(r3) | |
697d3899 PM |
2070 | mfspr r4, SPRN_HDAR |
2071 | mfspr r6, SPRN_HDSISR | |
e001fa78 MN |
2072 | BEGIN_FTR_SECTION |
2073 | /* Look for DSISR canary. If we find it, retry instruction */ | |
2074 | cmpdi r6, 0x7fff | |
2075 | beq 6f | |
2076 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) | |
2077 | cmpwi r0, 0 | |
f4c51f84 | 2078 | bne .Lradix_hdsi /* on radix, just save DAR/DSISR/ASDR */ |
4cf302bc PM |
2079 | /* HPTE not found fault or protection fault? */ |
2080 | andis. r0, r6, (DSISR_NOHPTE | DSISR_PROTFAULT)@h | |
697d3899 | 2081 | beq 1f /* if not, send it to the guest */ |
4e5acdc2 PM |
2082 | andi. r0, r11, MSR_DR /* data relocation enabled? */ |
2083 | beq 3f | |
ef8c640c PM |
2084 | BEGIN_FTR_SECTION |
2085 | mfspr r5, SPRN_ASDR /* on POWER9, use ASDR to get VSID */ | |
2086 | b 4f | |
2087 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) | |
697d3899 | 2088 | clrrdi r0, r4, 28 |
c75df6f9 | 2089 | PPC_SLBFEE_DOT(R5, R0) /* if so, look up SLB */ |
cf29b215 PM |
2090 | li r0, BOOK3S_INTERRUPT_DATA_SEGMENT |
2091 | bne 7f /* if no SLB entry found */ | |
697d3899 PM |
2092 | 4: std r4, VCPU_FAULT_DAR(r9) |
2093 | stw r6, VCPU_FAULT_DSISR(r9) | |
2094 | ||
2095 | /* Search the hash table. */ | |
2096 | mr r3, r9 /* vcpu pointer */ | |
342d3db7 | 2097 | li r7, 1 /* data fault */ |
b1576fec | 2098 | bl kvmppc_hpte_hv_fault |
697d3899 PM |
2099 | ld r9, HSTATE_KVM_VCPU(r13) |
2100 | ld r10, VCPU_PC(r9) | |
2101 | ld r11, VCPU_MSR(r9) | |
2102 | li r12, BOOK3S_INTERRUPT_H_DATA_STORAGE | |
2103 | cmpdi r3, 0 /* retry the instruction */ | |
2104 | beq 6f | |
2105 | cmpdi r3, -1 /* handle in kernel mode */ | |
b4072df4 | 2106 | beq guest_exit_cont |
697d3899 PM |
2107 | cmpdi r3, -2 /* MMIO emulation; need instr word */ |
2108 | beq 2f | |
2109 | ||
cf29b215 | 2110 | /* Synthesize a DSI (or DSegI) for the guest */ |
697d3899 PM |
2111 | ld r4, VCPU_FAULT_DAR(r9) |
2112 | mr r6, r3 | |
cf29b215 | 2113 | 1: li r0, BOOK3S_INTERRUPT_DATA_STORAGE |
697d3899 | 2114 | mtspr SPRN_DSISR, r6 |
cf29b215 | 2115 | 7: mtspr SPRN_DAR, r4 |
697d3899 PM |
2116 | mtspr SPRN_SRR0, r10 |
2117 | mtspr SPRN_SRR1, r11 | |
cf29b215 | 2118 | mr r10, r0 |
e4e38121 | 2119 | bl kvmppc_msr_interrupt |
b4072df4 | 2120 | fast_interrupt_c_return: |
697d3899 | 2121 | 6: ld r7, VCPU_CTR(r9) |
c63517c2 | 2122 | ld r8, VCPU_XER(r9) |
697d3899 PM |
2123 | mtctr r7 |
2124 | mtxer r8 | |
2125 | mr r4, r9 | |
2126 | b fast_guest_return | |
2127 | ||
2128 | 3: ld r5, VCPU_KVM(r9) /* not relocated, use VRMA */ | |
2129 | ld r5, KVM_VRMA_SLB_V(r5) | |
2130 | b 4b | |
2131 | ||
2132 | /* If this is for emulated MMIO, load the instruction word */ | |
2133 | 2: li r8, KVM_INST_FETCH_FAILED /* In case lwz faults */ | |
2134 | ||
2135 | /* Set guest mode to 'jump over instruction' so if lwz faults | |
2136 | * we'll just continue at the next IP. */ | |
2137 | li r0, KVM_GUEST_MODE_SKIP | |
2138 | stb r0, HSTATE_IN_GUEST(r13) | |
2139 | ||
2140 | /* Do the access with MSR:DR enabled */ | |
2141 | mfmsr r3 | |
2142 | ori r4, r3, MSR_DR /* Enable paging for data */ | |
2143 | mtmsrd r4 | |
2144 | lwz r8, 0(r10) | |
2145 | mtmsrd r3 | |
2146 | ||
2147 | /* Store the result */ | |
2148 | stw r8, VCPU_LAST_INST(r9) | |
2149 | ||
2150 | /* Unset guest mode. */ | |
44a3add8 | 2151 | li r0, KVM_GUEST_MODE_HOST_HV |
697d3899 | 2152 | stb r0, HSTATE_IN_GUEST(r13) |
b4072df4 | 2153 | b guest_exit_cont |
de56a948 | 2154 | |
f4c51f84 PM |
2155 | .Lradix_hdsi: |
2156 | std r4, VCPU_FAULT_DAR(r9) | |
2157 | stw r6, VCPU_FAULT_DSISR(r9) | |
2158 | .Lradix_hisi: | |
2159 | mfspr r5, SPRN_ASDR | |
2160 | std r5, VCPU_FAULT_GPA(r9) | |
2161 | b guest_exit_cont | |
2162 | ||
342d3db7 PM |
2163 | /* |
2164 | * Similarly for an HISI, reflect it to the guest as an ISI unless | |
2165 | * it is an HPTE not found fault for a page that we have paged out. | |
2166 | */ | |
2167 | kvmppc_hisi: | |
f4c51f84 PM |
2168 | ld r3, VCPU_KVM(r9) |
2169 | lbz r0, KVM_RADIX(r3) | |
2170 | cmpwi r0, 0 | |
2171 | bne .Lradix_hisi /* for radix, just save ASDR */ | |
342d3db7 PM |
2172 | andis. r0, r11, SRR1_ISI_NOPT@h |
2173 | beq 1f | |
4e5acdc2 PM |
2174 | andi. r0, r11, MSR_IR /* instruction relocation enabled? */ |
2175 | beq 3f | |
ef8c640c PM |
2176 | BEGIN_FTR_SECTION |
2177 | mfspr r5, SPRN_ASDR /* on POWER9, use ASDR to get VSID */ | |
2178 | b 4f | |
2179 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) | |
342d3db7 | 2180 | clrrdi r0, r10, 28 |
c75df6f9 | 2181 | PPC_SLBFEE_DOT(R5, R0) /* if so, look up SLB */ |
cf29b215 PM |
2182 | li r0, BOOK3S_INTERRUPT_INST_SEGMENT |
2183 | bne 7f /* if no SLB entry found */ | |
342d3db7 PM |
2184 | 4: |
2185 | /* Search the hash table. */ | |
2186 | mr r3, r9 /* vcpu pointer */ | |
2187 | mr r4, r10 | |
2188 | mr r6, r11 | |
2189 | li r7, 0 /* instruction fault */ | |
b1576fec | 2190 | bl kvmppc_hpte_hv_fault |
342d3db7 PM |
2191 | ld r9, HSTATE_KVM_VCPU(r13) |
2192 | ld r10, VCPU_PC(r9) | |
2193 | ld r11, VCPU_MSR(r9) | |
2194 | li r12, BOOK3S_INTERRUPT_H_INST_STORAGE | |
2195 | cmpdi r3, 0 /* retry the instruction */ | |
b4072df4 | 2196 | beq fast_interrupt_c_return |
342d3db7 | 2197 | cmpdi r3, -1 /* handle in kernel mode */ |
b4072df4 | 2198 | beq guest_exit_cont |
342d3db7 | 2199 | |
cf29b215 | 2200 | /* Synthesize an ISI (or ISegI) for the guest */ |
342d3db7 | 2201 | mr r11, r3 |
cf29b215 PM |
2202 | 1: li r0, BOOK3S_INTERRUPT_INST_STORAGE |
2203 | 7: mtspr SPRN_SRR0, r10 | |
342d3db7 | 2204 | mtspr SPRN_SRR1, r11 |
cf29b215 | 2205 | mr r10, r0 |
e4e38121 | 2206 | bl kvmppc_msr_interrupt |
b4072df4 | 2207 | b fast_interrupt_c_return |
342d3db7 PM |
2208 | |
2209 | 3: ld r6, VCPU_KVM(r9) /* not relocated, use VRMA */ | |
2210 | ld r5, KVM_VRMA_SLB_V(r6) | |
2211 | b 4b | |
2212 | ||
a8606e20 PM |
2213 | /* |
2214 | * Try to handle an hcall in real mode. | |
2215 | * Returns to the guest if we handle it, or continues on up to | |
2216 | * the kernel if we can't (i.e. if we don't have a handler for | |
2217 | * it, or if the handler returns H_TOO_HARD). | |
1f09c3ed PM |
2218 | * |
2219 | * r5 - r8 contain hcall args, | |
2220 | * r9 = vcpu, r10 = pc, r11 = msr, r12 = trap, r13 = paca | |
a8606e20 | 2221 | */ |
a8606e20 | 2222 | hcall_try_real_mode: |
c75df6f9 | 2223 | ld r3,VCPU_GPR(R3)(r9) |
a8606e20 | 2224 | andi. r0,r11,MSR_PR |
27025a60 LPF |
2225 | /* sc 1 from userspace - reflect to guest syscall */ |
2226 | bne sc_1_fast_return | |
360cae31 PM |
2227 | /* sc 1 from nested guest - give it to L1 to handle */ |
2228 | ld r0, VCPU_NESTED(r9) | |
2229 | cmpdi r0, 0 | |
2230 | bne guest_exit_cont | |
a8606e20 PM |
2231 | clrrdi r3,r3,2 |
2232 | cmpldi r3,hcall_real_table_end - hcall_real_table | |
b4072df4 | 2233 | bge guest_exit_cont |
699a0ea0 PM |
2234 | /* See if this hcall is enabled for in-kernel handling */ |
2235 | ld r4, VCPU_KVM(r9) | |
2236 | srdi r0, r3, 8 /* r0 = (r3 / 4) >> 6 */ | |
2237 | sldi r0, r0, 3 /* index into kvm->arch.enabled_hcalls[] */ | |
2238 | add r4, r4, r0 | |
2239 | ld r0, KVM_ENABLED_HCALLS(r4) | |
2240 | rlwinm r4, r3, 32-2, 0x3f /* r4 = (r3 / 4) & 0x3f */ | |
2241 | srd r0, r0, r4 | |
2242 | andi. r0, r0, 1 | |
2243 | beq guest_exit_cont | |
2244 | /* Get pointer to handler, if any, and call it */ | |
a8606e20 | 2245 | LOAD_REG_ADDR(r4, hcall_real_table) |
4baa1d87 | 2246 | lwax r3,r3,r4 |
a8606e20 | 2247 | cmpwi r3,0 |
b4072df4 | 2248 | beq guest_exit_cont |
05a308c7 AB |
2249 | add r12,r3,r4 |
2250 | mtctr r12 | |
a8606e20 | 2251 | mr r3,r9 /* get vcpu pointer */ |
c75df6f9 | 2252 | ld r4,VCPU_GPR(R4)(r9) |
a8606e20 PM |
2253 | bctrl |
2254 | cmpdi r3,H_TOO_HARD | |
2255 | beq hcall_real_fallback | |
2256 | ld r4,HSTATE_KVM_VCPU(r13) | |
c75df6f9 | 2257 | std r3,VCPU_GPR(R3)(r4) |
a8606e20 PM |
2258 | ld r10,VCPU_PC(r4) |
2259 | ld r11,VCPU_MSR(r4) | |
2260 | b fast_guest_return | |
2261 | ||
27025a60 LPF |
2262 | sc_1_fast_return: |
2263 | mtspr SPRN_SRR0,r10 | |
2264 | mtspr SPRN_SRR1,r11 | |
2265 | li r10, BOOK3S_INTERRUPT_SYSCALL | |
e4e38121 | 2266 | bl kvmppc_msr_interrupt |
27025a60 LPF |
2267 | mr r4,r9 |
2268 | b fast_guest_return | |
2269 | ||
a8606e20 PM |
2270 | /* We've attempted a real mode hcall, but it's punted it back |
2271 | * to userspace. We need to restore some clobbered volatiles | |
2272 | * before resuming the pass-it-to-qemu path */ | |
2273 | hcall_real_fallback: | |
2274 | li r12,BOOK3S_INTERRUPT_SYSCALL | |
2275 | ld r9, HSTATE_KVM_VCPU(r13) | |
a8606e20 | 2276 | |
b4072df4 | 2277 | b guest_exit_cont |
a8606e20 PM |
2278 | |
2279 | .globl hcall_real_table | |
2280 | hcall_real_table: | |
2281 | .long 0 /* 0 - unused */ | |
c1fb0194 AB |
2282 | .long DOTSYM(kvmppc_h_remove) - hcall_real_table |
2283 | .long DOTSYM(kvmppc_h_enter) - hcall_real_table | |
2284 | .long DOTSYM(kvmppc_h_read) - hcall_real_table | |
cdeee518 PM |
2285 | .long DOTSYM(kvmppc_h_clear_mod) - hcall_real_table |
2286 | .long DOTSYM(kvmppc_h_clear_ref) - hcall_real_table | |
c1fb0194 | 2287 | .long DOTSYM(kvmppc_h_protect) - hcall_real_table |
e40542af | 2288 | #ifdef CONFIG_SPAPR_TCE_IOMMU |
c1fb0194 | 2289 | .long DOTSYM(kvmppc_h_get_tce) - hcall_real_table |
31217db7 | 2290 | .long DOTSYM(kvmppc_rm_h_put_tce) - hcall_real_table |
e40542af JN |
2291 | #else |
2292 | .long 0 /* 0x1c */ | |
2293 | .long 0 /* 0x20 */ | |
2294 | #endif | |
a8606e20 | 2295 | .long 0 /* 0x24 - H_SET_SPRG0 */ |
c1fb0194 | 2296 | .long DOTSYM(kvmppc_h_set_dabr) - hcall_real_table |
eadfb1c5 | 2297 | .long DOTSYM(kvmppc_rm_h_page_init) - hcall_real_table |
a8606e20 PM |
2298 | .long 0 /* 0x30 */ |
2299 | .long 0 /* 0x34 */ | |
2300 | .long 0 /* 0x38 */ | |
2301 | .long 0 /* 0x3c */ | |
2302 | .long 0 /* 0x40 */ | |
2303 | .long 0 /* 0x44 */ | |
2304 | .long 0 /* 0x48 */ | |
2305 | .long 0 /* 0x4c */ | |
2306 | .long 0 /* 0x50 */ | |
2307 | .long 0 /* 0x54 */ | |
2308 | .long 0 /* 0x58 */ | |
2309 | .long 0 /* 0x5c */ | |
2310 | .long 0 /* 0x60 */ | |
e7d26f28 | 2311 | #ifdef CONFIG_KVM_XICS |
c1fb0194 AB |
2312 | .long DOTSYM(kvmppc_rm_h_eoi) - hcall_real_table |
2313 | .long DOTSYM(kvmppc_rm_h_cppr) - hcall_real_table | |
2314 | .long DOTSYM(kvmppc_rm_h_ipi) - hcall_real_table | |
5af50993 | 2315 | .long DOTSYM(kvmppc_rm_h_ipoll) - hcall_real_table |
c1fb0194 | 2316 | .long DOTSYM(kvmppc_rm_h_xirr) - hcall_real_table |
e7d26f28 BH |
2317 | #else |
2318 | .long 0 /* 0x64 - H_EOI */ | |
2319 | .long 0 /* 0x68 - H_CPPR */ | |
2320 | .long 0 /* 0x6c - H_IPI */ | |
2321 | .long 0 /* 0x70 - H_IPOLL */ | |
2322 | .long 0 /* 0x74 - H_XIRR */ | |
2323 | #endif | |
a8606e20 PM |
2324 | .long 0 /* 0x78 */ |
2325 | .long 0 /* 0x7c */ | |
2326 | .long 0 /* 0x80 */ | |
2327 | .long 0 /* 0x84 */ | |
2328 | .long 0 /* 0x88 */ | |
2329 | .long 0 /* 0x8c */ | |
2330 | .long 0 /* 0x90 */ | |
2331 | .long 0 /* 0x94 */ | |
2332 | .long 0 /* 0x98 */ | |
2333 | .long 0 /* 0x9c */ | |
2334 | .long 0 /* 0xa0 */ | |
2335 | .long 0 /* 0xa4 */ | |
2336 | .long 0 /* 0xa8 */ | |
2337 | .long 0 /* 0xac */ | |
2338 | .long 0 /* 0xb0 */ | |
2339 | .long 0 /* 0xb4 */ | |
2340 | .long 0 /* 0xb8 */ | |
2341 | .long 0 /* 0xbc */ | |
2342 | .long 0 /* 0xc0 */ | |
2343 | .long 0 /* 0xc4 */ | |
2344 | .long 0 /* 0xc8 */ | |
2345 | .long 0 /* 0xcc */ | |
2346 | .long 0 /* 0xd0 */ | |
2347 | .long 0 /* 0xd4 */ | |
2348 | .long 0 /* 0xd8 */ | |
2349 | .long 0 /* 0xdc */ | |
c1fb0194 | 2350 | .long DOTSYM(kvmppc_h_cede) - hcall_real_table |
90fd09f8 | 2351 | .long DOTSYM(kvmppc_rm_h_confer) - hcall_real_table |
a8606e20 PM |
2352 | .long 0 /* 0xe8 */ |
2353 | .long 0 /* 0xec */ | |
2354 | .long 0 /* 0xf0 */ | |
2355 | .long 0 /* 0xf4 */ | |
2356 | .long 0 /* 0xf8 */ | |
2357 | .long 0 /* 0xfc */ | |
2358 | .long 0 /* 0x100 */ | |
2359 | .long 0 /* 0x104 */ | |
2360 | .long 0 /* 0x108 */ | |
2361 | .long 0 /* 0x10c */ | |
2362 | .long 0 /* 0x110 */ | |
2363 | .long 0 /* 0x114 */ | |
2364 | .long 0 /* 0x118 */ | |
2365 | .long 0 /* 0x11c */ | |
2366 | .long 0 /* 0x120 */ | |
c1fb0194 | 2367 | .long DOTSYM(kvmppc_h_bulk_remove) - hcall_real_table |
8563bf52 PM |
2368 | .long 0 /* 0x128 */ |
2369 | .long 0 /* 0x12c */ | |
2370 | .long 0 /* 0x130 */ | |
c1fb0194 | 2371 | .long DOTSYM(kvmppc_h_set_xdabr) - hcall_real_table |
e40542af | 2372 | #ifdef CONFIG_SPAPR_TCE_IOMMU |
31217db7 | 2373 | .long DOTSYM(kvmppc_rm_h_stuff_tce) - hcall_real_table |
d3695aa4 | 2374 | .long DOTSYM(kvmppc_rm_h_put_tce_indirect) - hcall_real_table |
e40542af JN |
2375 | #else |
2376 | .long 0 /* 0x138 */ | |
2377 | .long 0 /* 0x13c */ | |
2378 | #endif | |
e928e9cb ME |
2379 | .long 0 /* 0x140 */ |
2380 | .long 0 /* 0x144 */ | |
2381 | .long 0 /* 0x148 */ | |
2382 | .long 0 /* 0x14c */ | |
2383 | .long 0 /* 0x150 */ | |
2384 | .long 0 /* 0x154 */ | |
2385 | .long 0 /* 0x158 */ | |
2386 | .long 0 /* 0x15c */ | |
2387 | .long 0 /* 0x160 */ | |
2388 | .long 0 /* 0x164 */ | |
2389 | .long 0 /* 0x168 */ | |
2390 | .long 0 /* 0x16c */ | |
2391 | .long 0 /* 0x170 */ | |
2392 | .long 0 /* 0x174 */ | |
2393 | .long 0 /* 0x178 */ | |
2394 | .long 0 /* 0x17c */ | |
2395 | .long 0 /* 0x180 */ | |
2396 | .long 0 /* 0x184 */ | |
2397 | .long 0 /* 0x188 */ | |
2398 | .long 0 /* 0x18c */ | |
2399 | .long 0 /* 0x190 */ | |
2400 | .long 0 /* 0x194 */ | |
2401 | .long 0 /* 0x198 */ | |
2402 | .long 0 /* 0x19c */ | |
2403 | .long 0 /* 0x1a0 */ | |
2404 | .long 0 /* 0x1a4 */ | |
2405 | .long 0 /* 0x1a8 */ | |
2406 | .long 0 /* 0x1ac */ | |
2407 | .long 0 /* 0x1b0 */ | |
2408 | .long 0 /* 0x1b4 */ | |
2409 | .long 0 /* 0x1b8 */ | |
2410 | .long 0 /* 0x1bc */ | |
2411 | .long 0 /* 0x1c0 */ | |
2412 | .long 0 /* 0x1c4 */ | |
2413 | .long 0 /* 0x1c8 */ | |
2414 | .long 0 /* 0x1cc */ | |
2415 | .long 0 /* 0x1d0 */ | |
2416 | .long 0 /* 0x1d4 */ | |
2417 | .long 0 /* 0x1d8 */ | |
2418 | .long 0 /* 0x1dc */ | |
2419 | .long 0 /* 0x1e0 */ | |
2420 | .long 0 /* 0x1e4 */ | |
2421 | .long 0 /* 0x1e8 */ | |
2422 | .long 0 /* 0x1ec */ | |
2423 | .long 0 /* 0x1f0 */ | |
2424 | .long 0 /* 0x1f4 */ | |
2425 | .long 0 /* 0x1f8 */ | |
2426 | .long 0 /* 0x1fc */ | |
2427 | .long 0 /* 0x200 */ | |
2428 | .long 0 /* 0x204 */ | |
2429 | .long 0 /* 0x208 */ | |
2430 | .long 0 /* 0x20c */ | |
2431 | .long 0 /* 0x210 */ | |
2432 | .long 0 /* 0x214 */ | |
2433 | .long 0 /* 0x218 */ | |
2434 | .long 0 /* 0x21c */ | |
2435 | .long 0 /* 0x220 */ | |
2436 | .long 0 /* 0x224 */ | |
2437 | .long 0 /* 0x228 */ | |
2438 | .long 0 /* 0x22c */ | |
2439 | .long 0 /* 0x230 */ | |
2440 | .long 0 /* 0x234 */ | |
2441 | .long 0 /* 0x238 */ | |
2442 | .long 0 /* 0x23c */ | |
2443 | .long 0 /* 0x240 */ | |
2444 | .long 0 /* 0x244 */ | |
2445 | .long 0 /* 0x248 */ | |
2446 | .long 0 /* 0x24c */ | |
2447 | .long 0 /* 0x250 */ | |
2448 | .long 0 /* 0x254 */ | |
2449 | .long 0 /* 0x258 */ | |
2450 | .long 0 /* 0x25c */ | |
2451 | .long 0 /* 0x260 */ | |
2452 | .long 0 /* 0x264 */ | |
2453 | .long 0 /* 0x268 */ | |
2454 | .long 0 /* 0x26c */ | |
2455 | .long 0 /* 0x270 */ | |
2456 | .long 0 /* 0x274 */ | |
2457 | .long 0 /* 0x278 */ | |
2458 | .long 0 /* 0x27c */ | |
2459 | .long 0 /* 0x280 */ | |
2460 | .long 0 /* 0x284 */ | |
2461 | .long 0 /* 0x288 */ | |
2462 | .long 0 /* 0x28c */ | |
2463 | .long 0 /* 0x290 */ | |
2464 | .long 0 /* 0x294 */ | |
2465 | .long 0 /* 0x298 */ | |
2466 | .long 0 /* 0x29c */ | |
2467 | .long 0 /* 0x2a0 */ | |
2468 | .long 0 /* 0x2a4 */ | |
2469 | .long 0 /* 0x2a8 */ | |
2470 | .long 0 /* 0x2ac */ | |
2471 | .long 0 /* 0x2b0 */ | |
2472 | .long 0 /* 0x2b4 */ | |
2473 | .long 0 /* 0x2b8 */ | |
2474 | .long 0 /* 0x2bc */ | |
2475 | .long 0 /* 0x2c0 */ | |
2476 | .long 0 /* 0x2c4 */ | |
2477 | .long 0 /* 0x2c8 */ | |
2478 | .long 0 /* 0x2cc */ | |
2479 | .long 0 /* 0x2d0 */ | |
2480 | .long 0 /* 0x2d4 */ | |
2481 | .long 0 /* 0x2d8 */ | |
2482 | .long 0 /* 0x2dc */ | |
2483 | .long 0 /* 0x2e0 */ | |
2484 | .long 0 /* 0x2e4 */ | |
2485 | .long 0 /* 0x2e8 */ | |
2486 | .long 0 /* 0x2ec */ | |
2487 | .long 0 /* 0x2f0 */ | |
2488 | .long 0 /* 0x2f4 */ | |
2489 | .long 0 /* 0x2f8 */ | |
5af50993 BH |
2490 | #ifdef CONFIG_KVM_XICS |
2491 | .long DOTSYM(kvmppc_rm_h_xirr_x) - hcall_real_table | |
2492 | #else | |
2493 | .long 0 /* 0x2fc - H_XIRR_X*/ | |
2494 | #endif | |
e928e9cb | 2495 | .long DOTSYM(kvmppc_h_random) - hcall_real_table |
ae2113a4 | 2496 | .globl hcall_real_table_end |
a8606e20 PM |
2497 | hcall_real_table_end: |
2498 | ||
8563bf52 | 2499 | _GLOBAL(kvmppc_h_set_xdabr) |
4bad7779 | 2500 | EXPORT_SYMBOL_GPL(kvmppc_h_set_xdabr) |
8563bf52 PM |
2501 | andi. r0, r5, DABRX_USER | DABRX_KERNEL |
2502 | beq 6f | |
2503 | li r0, DABRX_USER | DABRX_KERNEL | DABRX_BTI | |
2504 | andc. r0, r5, r0 | |
2505 | beq 3f | |
2506 | 6: li r3, H_PARAMETER | |
2507 | blr | |
2508 | ||
a8606e20 | 2509 | _GLOBAL(kvmppc_h_set_dabr) |
4bad7779 | 2510 | EXPORT_SYMBOL_GPL(kvmppc_h_set_dabr) |
8563bf52 PM |
2511 | li r5, DABRX_USER | DABRX_KERNEL |
2512 | 3: | |
eee7ff9d MN |
2513 | BEGIN_FTR_SECTION |
2514 | b 2f | |
2515 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) | |
a8606e20 | 2516 | std r4,VCPU_DABR(r3) |
8563bf52 PM |
2517 | stw r5, VCPU_DABRX(r3) |
2518 | mtspr SPRN_DABRX, r5 | |
8943633c PM |
2519 | /* Work around P7 bug where DABR can get corrupted on mtspr */ |
2520 | 1: mtspr SPRN_DABR,r4 | |
2521 | mfspr r5, SPRN_DABR | |
2522 | cmpd r4, r5 | |
2523 | bne 1b | |
2524 | isync | |
a8606e20 PM |
2525 | li r3,0 |
2526 | blr | |
2527 | ||
e8ebedbf | 2528 | 2: |
c1fe190c MN |
2529 | LOAD_REG_ADDR(r11, dawr_force_enable) |
2530 | lbz r11, 0(r11) | |
2531 | cmpdi r11, 0 | |
fabb2efc | 2532 | bne 3f |
ca9a16c3 | 2533 | li r3, H_HARDWARE |
fabb2efc MN |
2534 | blr |
2535 | 3: | |
8563bf52 | 2536 | /* Emulate H_SET_DABR/X on P8 for the sake of compat mode guests */ |
e8ebedbf | 2537 | rlwimi r5, r4, 5, DAWRX_DR | DAWRX_DW |
760a7364 | 2538 | rlwimi r5, r4, 2, DAWRX_WT |
8563bf52 PM |
2539 | clrrdi r4, r4, 3 |
2540 | std r4, VCPU_DAWR(r3) | |
2541 | std r5, VCPU_DAWRX(r3) | |
84b02824 SJS |
2542 | /* |
2543 | * If came in through the real mode hcall handler then it is necessary | |
2544 | * to write the registers since the return path won't. Otherwise it is | |
2545 | * sufficient to store then in the vcpu struct as they will be loaded | |
2546 | * next time the vcpu is run. | |
2547 | */ | |
2548 | mfmsr r6 | |
2549 | andi. r6, r6, MSR_DR /* in real mode? */ | |
2550 | bne 4f | |
8563bf52 PM |
2551 | mtspr SPRN_DAWR, r4 |
2552 | mtspr SPRN_DAWRX, r5 | |
84b02824 | 2553 | 4: li r3, 0 |
a8606e20 PM |
2554 | blr |
2555 | ||
1f09c3ed | 2556 | _GLOBAL(kvmppc_h_cede) /* r3 = vcpu pointer, r11 = msr, r13 = paca */ |
19ccb76a PM |
2557 | ori r11,r11,MSR_EE |
2558 | std r11,VCPU_MSR(r3) | |
2559 | li r0,1 | |
2560 | stb r0,VCPU_CEDED(r3) | |
2561 | sync /* order setting ceded vs. testing prodded */ | |
2562 | lbz r5,VCPU_PRODDED(r3) | |
2563 | cmpwi r5,0 | |
04f995a5 | 2564 | bne kvm_cede_prodded |
6af27c84 PM |
2565 | li r12,0 /* set trap to 0 to say hcall is handled */ |
2566 | stw r12,VCPU_TRAP(r3) | |
19ccb76a | 2567 | li r0,H_SUCCESS |
c75df6f9 | 2568 | std r0,VCPU_GPR(R3)(r3) |
19ccb76a PM |
2569 | |
2570 | /* | |
2571 | * Set our bit in the bitmask of napping threads unless all the | |
2572 | * other threads are already napping, in which case we send this | |
2573 | * up to the host. | |
2574 | */ | |
2575 | ld r5,HSTATE_KVM_VCORE(r13) | |
e0b7ec05 | 2576 | lbz r6,HSTATE_PTID(r13) |
19ccb76a PM |
2577 | lwz r8,VCORE_ENTRY_EXIT(r5) |
2578 | clrldi r8,r8,56 | |
2579 | li r0,1 | |
2580 | sld r0,r0,r6 | |
2581 | addi r6,r5,VCORE_NAPPING_THREADS | |
2582 | 31: lwarx r4,0,r6 | |
2583 | or r4,r4,r0 | |
7d6c40da PM |
2584 | cmpw r4,r8 |
2585 | beq kvm_cede_exit | |
19ccb76a PM |
2586 | stwcx. r4,0,r6 |
2587 | bne 31b | |
7d6c40da | 2588 | /* order napping_threads update vs testing entry_exit_map */ |
f019b7ad | 2589 | isync |
e0b7ec05 | 2590 | li r0,NAPPING_CEDE |
19ccb76a | 2591 | stb r0,HSTATE_NAPPING(r13) |
19ccb76a PM |
2592 | lwz r7,VCORE_ENTRY_EXIT(r5) |
2593 | cmpwi r7,0x100 | |
2594 | bge 33f /* another thread already exiting */ | |
2595 | ||
2596 | /* | |
2597 | * Although not specifically required by the architecture, POWER7 | |
2598 | * preserves the following registers in nap mode, even if an SMT mode | |
2599 | * switch occurs: SLB entries, PURR, SPURR, AMOR, UAMOR, AMR, SPRG0-3, | |
2600 | * DAR, DSISR, DABR, DABRX, DSCR, PMCx, MMCRx, SIAR, SDAR. | |
2601 | */ | |
2602 | /* Save non-volatile GPRs */ | |
c75df6f9 MN |
2603 | std r14, VCPU_GPR(R14)(r3) |
2604 | std r15, VCPU_GPR(R15)(r3) | |
2605 | std r16, VCPU_GPR(R16)(r3) | |
2606 | std r17, VCPU_GPR(R17)(r3) | |
2607 | std r18, VCPU_GPR(R18)(r3) | |
2608 | std r19, VCPU_GPR(R19)(r3) | |
2609 | std r20, VCPU_GPR(R20)(r3) | |
2610 | std r21, VCPU_GPR(R21)(r3) | |
2611 | std r22, VCPU_GPR(R22)(r3) | |
2612 | std r23, VCPU_GPR(R23)(r3) | |
2613 | std r24, VCPU_GPR(R24)(r3) | |
2614 | std r25, VCPU_GPR(R25)(r3) | |
2615 | std r26, VCPU_GPR(R26)(r3) | |
2616 | std r27, VCPU_GPR(R27)(r3) | |
2617 | std r28, VCPU_GPR(R28)(r3) | |
2618 | std r29, VCPU_GPR(R29)(r3) | |
2619 | std r30, VCPU_GPR(R30)(r3) | |
2620 | std r31, VCPU_GPR(R31)(r3) | |
19ccb76a PM |
2621 | |
2622 | /* save FP state */ | |
595e4f7e | 2623 | bl kvmppc_save_fp |
19ccb76a | 2624 | |
93d17397 | 2625 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
4bb3c7a0 PM |
2626 | /* |
2627 | * Branch around the call if both CPU_FTR_TM and | |
2628 | * CPU_FTR_P9_TM_HV_ASSIST are off. | |
2629 | */ | |
93d17397 | 2630 | BEGIN_FTR_SECTION |
4bb3c7a0 PM |
2631 | b 91f |
2632 | END_FTR_SECTION(CPU_FTR_TM | CPU_FTR_P9_TM_HV_ASSIST, 0) | |
67f8a8c1 | 2633 | /* |
7854f754 | 2634 | * NOTE THAT THIS TRASHES ALL NON-VOLATILE REGISTERS (but not CR) |
67f8a8c1 | 2635 | */ |
6f597c6b SG |
2636 | ld r3, HSTATE_KVM_VCPU(r13) |
2637 | ld r4, VCPU_MSR(r3) | |
7854f754 | 2638 | li r5, 0 /* don't preserve non-vol regs */ |
7b0e827c | 2639 | bl kvmppc_save_tm_hv |
7854f754 | 2640 | nop |
4bb3c7a0 | 2641 | 91: |
93d17397 PM |
2642 | #endif |
2643 | ||
fd6d53b1 PM |
2644 | /* |
2645 | * Set DEC to the smaller of DEC and HDEC, so that we wake | |
2646 | * no later than the end of our timeslice (HDEC interrupts | |
2647 | * don't wake us from nap). | |
2648 | */ | |
2649 | mfspr r3, SPRN_DEC | |
2650 | mfspr r4, SPRN_HDEC | |
2651 | mftb r5 | |
1bc3fe81 PM |
2652 | BEGIN_FTR_SECTION |
2653 | /* On P9 check whether the guest has large decrementer mode enabled */ | |
2654 | ld r6, HSTATE_KVM_VCORE(r13) | |
2655 | ld r6, VCORE_LPCR(r6) | |
2656 | andis. r6, r6, LPCR_LD@h | |
2657 | bne 68f | |
2658 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) | |
2f272463 | 2659 | extsw r3, r3 |
1bc3fe81 | 2660 | 68: EXTEND_HDEC(r4) |
2f272463 | 2661 | cmpd r3, r4 |
fd6d53b1 PM |
2662 | ble 67f |
2663 | mtspr SPRN_DEC, r4 | |
2664 | 67: | |
2665 | /* save expiry time of guest decrementer */ | |
fd6d53b1 PM |
2666 | add r3, r3, r5 |
2667 | ld r4, HSTATE_KVM_VCPU(r13) | |
2668 | ld r5, HSTATE_KVM_VCORE(r13) | |
57b8daa7 | 2669 | ld r6, VCORE_TB_OFFSET_APPL(r5) |
fd6d53b1 PM |
2670 | subf r3, r6, r3 /* convert to host TB value */ |
2671 | std r3, VCPU_DEC_EXPIRES(r4) | |
2672 | ||
b6c295df PM |
2673 | #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING |
2674 | ld r4, HSTATE_KVM_VCPU(r13) | |
2675 | addi r3, r4, VCPU_TB_CEDE | |
2676 | bl kvmhv_accumulate_time | |
2677 | #endif | |
2678 | ||
ccc07772 PM |
2679 | lis r3, LPCR_PECEDP@h /* Do wake on privileged doorbell */ |
2680 | ||
10d91611 NP |
2681 | /* Go back to host stack */ |
2682 | ld r1, HSTATE_HOST_R1(r13) | |
2683 | ||
19ccb76a | 2684 | /* |
aa31e843 | 2685 | * Take a nap until a decrementer or external or doobell interrupt |
ccc07772 | 2686 | * occurs, with PECE1 and PECE0 set in LPCR. |
66feed61 | 2687 | * On POWER8, set PECEDH, and if we are ceding, also set PECEDP. |
ccc07772 | 2688 | * Also clear the runlatch bit before napping. |
19ccb76a | 2689 | */ |
56548fc0 | 2690 | kvm_do_nap: |
1f09c3ed PM |
2691 | mfspr r0, SPRN_CTRLF |
2692 | clrrdi r0, r0, 1 | |
2693 | mtspr SPRN_CTRLT, r0 | |
582b910e | 2694 | |
f0888f70 PM |
2695 | li r0,1 |
2696 | stb r0,HSTATE_HWTHREAD_REQ(r13) | |
19ccb76a PM |
2697 | mfspr r5,SPRN_LPCR |
2698 | ori r5,r5,LPCR_PECE0 | LPCR_PECE1 | |
aa31e843 | 2699 | BEGIN_FTR_SECTION |
66feed61 | 2700 | ori r5, r5, LPCR_PECEDH |
ccc07772 | 2701 | rlwimi r5, r3, 0, LPCR_PECEDP |
aa31e843 | 2702 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) |
bf53c88e PM |
2703 | |
2704 | kvm_nap_sequence: /* desired LPCR value in r5 */ | |
2705 | BEGIN_FTR_SECTION | |
2706 | /* | |
2707 | * PSSCR bits: exit criterion = 1 (wakeup based on LPCR at sreset) | |
2708 | * enable state loss = 1 (allow SMT mode switch) | |
2709 | * requested level = 0 (just stop dispatching) | |
2710 | */ | |
2711 | lis r3, (PSSCR_EC | PSSCR_ESL)@h | |
bf53c88e PM |
2712 | /* Set LPCR_PECE_HVEE bit to enable wakeup by HV interrupts */ |
2713 | li r4, LPCR_PECE_HVEE@higher | |
2714 | sldi r4, r4, 32 | |
2715 | or r5, r5, r4 | |
10d91611 NP |
2716 | FTR_SECTION_ELSE |
2717 | li r3, PNV_THREAD_NAP | |
2718 | ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300) | |
19ccb76a PM |
2719 | mtspr SPRN_LPCR,r5 |
2720 | isync | |
10d91611 | 2721 | |
bf53c88e | 2722 | BEGIN_FTR_SECTION |
10d91611 | 2723 | bl isa300_idle_stop_mayloss |
bf53c88e | 2724 | FTR_SECTION_ELSE |
10d91611 NP |
2725 | bl isa206_idle_insn_mayloss |
2726 | ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300) | |
2727 | ||
2728 | mfspr r0, SPRN_CTRLF | |
2729 | ori r0, r0, 1 | |
2730 | mtspr SPRN_CTRLT, r0 | |
2731 | ||
2732 | mtspr SPRN_SRR1, r3 | |
2733 | ||
2734 | li r0, 0 | |
2735 | stb r0, PACA_FTRACE_ENABLED(r13) | |
2736 | ||
2737 | li r0, KVM_HWTHREAD_IN_KVM | |
2738 | stb r0, HSTATE_HWTHREAD_STATE(r13) | |
2739 | ||
2740 | lbz r0, HSTATE_NAPPING(r13) | |
2741 | cmpwi r0, NAPPING_CEDE | |
2742 | beq kvm_end_cede | |
2743 | cmpwi r0, NAPPING_NOVCPU | |
2744 | beq kvm_novcpu_wakeup | |
2745 | cmpwi r0, NAPPING_UNSPLIT | |
2746 | beq kvm_unsplit_wakeup | |
2747 | twi 31,0,0 /* Nap state must not be zero */ | |
19ccb76a | 2748 | |
e3bbbbfa PM |
2749 | 33: mr r4, r3 |
2750 | li r3, 0 | |
2751 | li r12, 0 | |
2752 | b 34f | |
2753 | ||
19ccb76a | 2754 | kvm_end_cede: |
10d91611 NP |
2755 | /* Woken by external or decrementer interrupt */ |
2756 | ||
4619ac88 PM |
2757 | /* get vcpu pointer */ |
2758 | ld r4, HSTATE_KVM_VCPU(r13) | |
2759 | ||
b6c295df PM |
2760 | #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING |
2761 | addi r3, r4, VCPU_TB_RMINTR | |
2762 | bl kvmhv_accumulate_time | |
2763 | #endif | |
2764 | ||
93d17397 | 2765 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
4bb3c7a0 PM |
2766 | /* |
2767 | * Branch around the call if both CPU_FTR_TM and | |
2768 | * CPU_FTR_P9_TM_HV_ASSIST are off. | |
2769 | */ | |
93d17397 | 2770 | BEGIN_FTR_SECTION |
4bb3c7a0 PM |
2771 | b 91f |
2772 | END_FTR_SECTION(CPU_FTR_TM | CPU_FTR_P9_TM_HV_ASSIST, 0) | |
67f8a8c1 | 2773 | /* |
7854f754 | 2774 | * NOTE THAT THIS TRASHES ALL NON-VOLATILE REGISTERS (but not CR) |
67f8a8c1 | 2775 | */ |
6f597c6b SG |
2776 | mr r3, r4 |
2777 | ld r4, VCPU_MSR(r3) | |
7854f754 | 2778 | li r5, 0 /* don't preserve non-vol regs */ |
7b0e827c | 2779 | bl kvmppc_restore_tm_hv |
7854f754 | 2780 | nop |
6f597c6b | 2781 | ld r4, HSTATE_KVM_VCPU(r13) |
4bb3c7a0 | 2782 | 91: |
93d17397 PM |
2783 | #endif |
2784 | ||
19ccb76a PM |
2785 | /* load up FP state */ |
2786 | bl kvmppc_load_fp | |
2787 | ||
fd6d53b1 PM |
2788 | /* Restore guest decrementer */ |
2789 | ld r3, VCPU_DEC_EXPIRES(r4) | |
2790 | ld r5, HSTATE_KVM_VCORE(r13) | |
57b8daa7 | 2791 | ld r6, VCORE_TB_OFFSET_APPL(r5) |
fd6d53b1 PM |
2792 | add r3, r3, r6 /* convert host TB to guest TB value */ |
2793 | mftb r7 | |
2794 | subf r3, r7, r3 | |
2795 | mtspr SPRN_DEC, r3 | |
2796 | ||
19ccb76a | 2797 | /* Load NV GPRS */ |
c75df6f9 MN |
2798 | ld r14, VCPU_GPR(R14)(r4) |
2799 | ld r15, VCPU_GPR(R15)(r4) | |
2800 | ld r16, VCPU_GPR(R16)(r4) | |
2801 | ld r17, VCPU_GPR(R17)(r4) | |
2802 | ld r18, VCPU_GPR(R18)(r4) | |
2803 | ld r19, VCPU_GPR(R19)(r4) | |
2804 | ld r20, VCPU_GPR(R20)(r4) | |
2805 | ld r21, VCPU_GPR(R21)(r4) | |
2806 | ld r22, VCPU_GPR(R22)(r4) | |
2807 | ld r23, VCPU_GPR(R23)(r4) | |
2808 | ld r24, VCPU_GPR(R24)(r4) | |
2809 | ld r25, VCPU_GPR(R25)(r4) | |
2810 | ld r26, VCPU_GPR(R26)(r4) | |
2811 | ld r27, VCPU_GPR(R27)(r4) | |
2812 | ld r28, VCPU_GPR(R28)(r4) | |
2813 | ld r29, VCPU_GPR(R29)(r4) | |
2814 | ld r30, VCPU_GPR(R30)(r4) | |
2815 | ld r31, VCPU_GPR(R31)(r4) | |
37f55d30 | 2816 | |
e3bbbbfa PM |
2817 | /* Check the wake reason in SRR1 to see why we got here */ |
2818 | bl kvmppc_check_wake_reason | |
19ccb76a | 2819 | |
37f55d30 SW |
2820 | /* |
2821 | * Restore volatile registers since we could have called a | |
2822 | * C routine in kvmppc_check_wake_reason | |
2823 | * r4 = VCPU | |
2824 | * r3 tells us whether we need to return to host or not | |
2825 | * WARNING: it gets checked further down: | |
2826 | * should not modify r3 until this check is done. | |
2827 | */ | |
2828 | ld r4, HSTATE_KVM_VCPU(r13) | |
2829 | ||
19ccb76a | 2830 | /* clear our bit in vcore->napping_threads */ |
e3bbbbfa PM |
2831 | 34: ld r5,HSTATE_KVM_VCORE(r13) |
2832 | lbz r7,HSTATE_PTID(r13) | |
19ccb76a | 2833 | li r0,1 |
e3bbbbfa | 2834 | sld r0,r0,r7 |
19ccb76a PM |
2835 | addi r6,r5,VCORE_NAPPING_THREADS |
2836 | 32: lwarx r7,0,r6 | |
2837 | andc r7,r7,r0 | |
2838 | stwcx. r7,0,r6 | |
2839 | bne 32b | |
2840 | li r0,0 | |
2841 | stb r0,HSTATE_NAPPING(r13) | |
2842 | ||
37f55d30 | 2843 | /* See if the wake reason saved in r3 means we need to exit */ |
e3bbbbfa | 2844 | stw r12, VCPU_TRAP(r4) |
4619ac88 | 2845 | mr r9, r4 |
e3bbbbfa PM |
2846 | cmpdi r3, 0 |
2847 | bgt guest_exit_cont | |
df709a29 | 2848 | b maybe_reenter_guest |
19ccb76a PM |
2849 | |
2850 | /* cede when already previously prodded case */ | |
04f995a5 PM |
2851 | kvm_cede_prodded: |
2852 | li r0,0 | |
19ccb76a PM |
2853 | stb r0,VCPU_PRODDED(r3) |
2854 | sync /* order testing prodded vs. clearing ceded */ | |
2855 | stb r0,VCPU_CEDED(r3) | |
2856 | li r3,H_SUCCESS | |
2857 | blr | |
2858 | ||
2859 | /* we've ceded but we want to give control to the host */ | |
04f995a5 | 2860 | kvm_cede_exit: |
6af27c84 | 2861 | ld r9, HSTATE_KVM_VCPU(r13) |
9b9b13a6 | 2862 | #ifdef CONFIG_KVM_XICS |
959c5d51 PM |
2863 | /* are we using XIVE with single escalation? */ |
2864 | ld r10, VCPU_XIVE_ESC_VADDR(r9) | |
2865 | cmpdi r10, 0 | |
2866 | beq 3f | |
2867 | li r6, XIVE_ESB_SET_PQ_00 | |
2868 | /* | |
2869 | * If we still have a pending escalation, abort the cede, | |
2870 | * and we must set PQ to 10 rather than 00 so that we don't | |
2871 | * potentially end up with two entries for the escalation | |
2872 | * interrupt in the XIVE interrupt queue. In that case | |
2873 | * we also don't want to set xive_esc_on to 1 here in | |
2874 | * case we race with xive_esc_irq(). | |
2875 | */ | |
9b9b13a6 BH |
2876 | lbz r5, VCPU_XIVE_ESC_ON(r9) |
2877 | cmpwi r5, 0 | |
959c5d51 | 2878 | beq 4f |
9b9b13a6 BH |
2879 | li r0, 0 |
2880 | stb r0, VCPU_CEDED(r9) | |
959c5d51 PM |
2881 | li r6, XIVE_ESB_SET_PQ_10 |
2882 | b 5f | |
2883 | 4: li r0, 1 | |
2884 | stb r0, VCPU_XIVE_ESC_ON(r9) | |
2885 | /* make sure store to xive_esc_on is seen before xive_esc_irq runs */ | |
2886 | sync | |
2887 | 5: /* Enable XIVE escalation */ | |
9b9b13a6 BH |
2888 | mfmsr r0 |
2889 | andi. r0, r0, MSR_DR /* in real mode? */ | |
2890 | beq 1f | |
959c5d51 | 2891 | ldx r0, r10, r6 |
9b9b13a6 BH |
2892 | b 2f |
2893 | 1: ld r10, VCPU_XIVE_ESC_RADDR(r9) | |
959c5d51 | 2894 | ldcix r0, r10, r6 |
9b9b13a6 | 2895 | 2: sync |
9b9b13a6 BH |
2896 | #endif /* CONFIG_KVM_XICS */ |
2897 | 3: b guest_exit_cont | |
19ccb76a | 2898 | |
884dfb72 | 2899 | /* Try to do machine check recovery in real mode */ |
b4072df4 PM |
2900 | machine_check_realmode: |
2901 | mr r3, r9 /* get vcpu pointer */ | |
b1576fec | 2902 | bl kvmppc_realmode_machine_check |
b4072df4 | 2903 | nop |
884dfb72 | 2904 | /* all machine checks go to virtual mode for further handling */ |
b4072df4 PM |
2905 | ld r9, HSTATE_KVM_VCPU(r13) |
2906 | li r12, BOOK3S_INTERRUPT_MACHINE_CHECK | |
884dfb72 | 2907 | b guest_exit_cont |
b4072df4 | 2908 | |
df709a29 PM |
2909 | /* |
2910 | * Call C code to handle a HMI in real mode. | |
2911 | * Only the primary thread does the call, secondary threads are handled | |
2912 | * by calling hmi_exception_realmode() after kvmppc_hv_entry returns. | |
2913 | * r9 points to the vcpu on entry | |
2914 | */ | |
2915 | hmi_realmode: | |
2916 | lbz r0, HSTATE_PTID(r13) | |
2917 | cmpwi r0, 0 | |
2918 | bne guest_exit_cont | |
2919 | bl kvmppc_realmode_hmi_handler | |
2920 | ld r9, HSTATE_KVM_VCPU(r13) | |
2921 | li r12, BOOK3S_INTERRUPT_HMI | |
2922 | b guest_exit_cont | |
2923 | ||
e3bbbbfa PM |
2924 | /* |
2925 | * Check the reason we woke from nap, and take appropriate action. | |
1f09c3ed | 2926 | * Returns (in r3): |
e3bbbbfa PM |
2927 | * 0 if nothing needs to be done |
2928 | * 1 if something happened that needs to be handled by the host | |
66feed61 | 2929 | * -1 if there was a guest wakeup (IPI or msgsnd) |
e3c13e56 SW |
2930 | * -2 if we handled a PCI passthrough interrupt (returned by |
2931 | * kvmppc_read_intr only) | |
e3bbbbfa PM |
2932 | * |
2933 | * Also sets r12 to the interrupt vector for any interrupt that needs | |
2934 | * to be handled now by the host (0x500 for external interrupt), or zero. | |
37f55d30 SW |
2935 | * Modifies all volatile registers (since it may call a C function). |
2936 | * This routine calls kvmppc_read_intr, a C function, if an external | |
2937 | * interrupt is pending. | |
e3bbbbfa PM |
2938 | */ |
2939 | kvmppc_check_wake_reason: | |
2940 | mfspr r6, SPRN_SRR1 | |
aa31e843 PM |
2941 | BEGIN_FTR_SECTION |
2942 | rlwinm r6, r6, 45-31, 0xf /* extract wake reason field (P8) */ | |
2943 | FTR_SECTION_ELSE | |
2944 | rlwinm r6, r6, 45-31, 0xe /* P7 wake reason field is 3 bits */ | |
2945 | ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_207S) | |
2946 | cmpwi r6, 8 /* was it an external interrupt? */ | |
37f55d30 | 2947 | beq 7f /* if so, see what it was */ |
e3bbbbfa PM |
2948 | li r3, 0 |
2949 | li r12, 0 | |
2950 | cmpwi r6, 6 /* was it the decrementer? */ | |
2951 | beq 0f | |
aa31e843 PM |
2952 | BEGIN_FTR_SECTION |
2953 | cmpwi r6, 5 /* privileged doorbell? */ | |
2954 | beq 0f | |
5d00f66b PM |
2955 | cmpwi r6, 3 /* hypervisor doorbell? */ |
2956 | beq 3f | |
aa31e843 | 2957 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) |
fd7bacbc MS |
2958 | cmpwi r6, 0xa /* Hypervisor maintenance ? */ |
2959 | beq 4f | |
e3bbbbfa PM |
2960 | li r3, 1 /* anything else, return 1 */ |
2961 | 0: blr | |
2962 | ||
5d00f66b PM |
2963 | /* hypervisor doorbell */ |
2964 | 3: li r12, BOOK3S_INTERRUPT_H_DOORBELL | |
70aa3961 GS |
2965 | |
2966 | /* | |
2967 | * Clear the doorbell as we will invoke the handler | |
2968 | * explicitly in the guest exit path. | |
2969 | */ | |
2970 | lis r6, (PPC_DBELL_SERVER << (63-36))@h | |
2971 | PPC_MSGCLR(6) | |
66feed61 | 2972 | /* see if it's a host IPI */ |
5d00f66b | 2973 | li r3, 1 |
2cde3716 NP |
2974 | BEGIN_FTR_SECTION |
2975 | PPC_MSGSYNC | |
2976 | lwsync | |
2977 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) | |
66feed61 PM |
2978 | lbz r0, HSTATE_HOST_IPI(r13) |
2979 | cmpwi r0, 0 | |
2980 | bnelr | |
70aa3961 | 2981 | /* if not, return -1 */ |
66feed61 | 2982 | li r3, -1 |
5d00f66b PM |
2983 | blr |
2984 | ||
fd7bacbc MS |
2985 | /* Woken up due to Hypervisor maintenance interrupt */ |
2986 | 4: li r12, BOOK3S_INTERRUPT_HMI | |
2987 | li r3, 1 | |
2988 | blr | |
2989 | ||
37f55d30 SW |
2990 | /* external interrupt - create a stack frame so we can call C */ |
2991 | 7: mflr r0 | |
2992 | std r0, PPC_LR_STKOFF(r1) | |
2993 | stdu r1, -PPC_MIN_STKFRM(r1) | |
2994 | bl kvmppc_read_intr | |
2995 | nop | |
2996 | li r12, BOOK3S_INTERRUPT_EXTERNAL | |
f7af5209 SW |
2997 | cmpdi r3, 1 |
2998 | ble 1f | |
2999 | ||
3000 | /* | |
3001 | * Return code of 2 means PCI passthrough interrupt, but | |
3002 | * we need to return back to host to complete handling the | |
3003 | * interrupt. Trap reason is expected in r12 by guest | |
3004 | * exit code. | |
3005 | */ | |
3006 | li r12, BOOK3S_INTERRUPT_HV_RM_HARD | |
3007 | 1: | |
37f55d30 SW |
3008 | ld r0, PPC_MIN_STKFRM+PPC_LR_STKOFF(r1) |
3009 | addi r1, r1, PPC_MIN_STKFRM | |
3010 | mtlr r0 | |
3011 | blr | |
371fefd6 | 3012 | |
de56a948 PM |
3013 | /* |
3014 | * Save away FP, VMX and VSX registers. | |
3015 | * r3 = vcpu pointer | |
595e4f7e PM |
3016 | * N.B. r30 and r31 are volatile across this function, |
3017 | * thus it is not callable from C. | |
a8606e20 | 3018 | */ |
595e4f7e PM |
3019 | kvmppc_save_fp: |
3020 | mflr r30 | |
3021 | mr r31,r3 | |
8943633c PM |
3022 | mfmsr r5 |
3023 | ori r8,r5,MSR_FP | |
de56a948 PM |
3024 | #ifdef CONFIG_ALTIVEC |
3025 | BEGIN_FTR_SECTION | |
3026 | oris r8,r8,MSR_VEC@h | |
3027 | END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) | |
3028 | #endif | |
3029 | #ifdef CONFIG_VSX | |
3030 | BEGIN_FTR_SECTION | |
3031 | oris r8,r8,MSR_VSX@h | |
3032 | END_FTR_SECTION_IFSET(CPU_FTR_VSX) | |
3033 | #endif | |
3034 | mtmsrd r8 | |
595e4f7e | 3035 | addi r3,r3,VCPU_FPRS |
9bf163f8 | 3036 | bl store_fp_state |
de56a948 PM |
3037 | #ifdef CONFIG_ALTIVEC |
3038 | BEGIN_FTR_SECTION | |
595e4f7e | 3039 | addi r3,r31,VCPU_VRS |
9bf163f8 | 3040 | bl store_vr_state |
de56a948 PM |
3041 | END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) |
3042 | #endif | |
3043 | mfspr r6,SPRN_VRSAVE | |
e724f080 | 3044 | stw r6,VCPU_VRSAVE(r31) |
595e4f7e | 3045 | mtlr r30 |
de56a948 PM |
3046 | blr |
3047 | ||
3048 | /* | |
3049 | * Load up FP, VMX and VSX registers | |
3050 | * r4 = vcpu pointer | |
595e4f7e PM |
3051 | * N.B. r30 and r31 are volatile across this function, |
3052 | * thus it is not callable from C. | |
de56a948 | 3053 | */ |
de56a948 | 3054 | kvmppc_load_fp: |
595e4f7e PM |
3055 | mflr r30 |
3056 | mr r31,r4 | |
de56a948 PM |
3057 | mfmsr r9 |
3058 | ori r8,r9,MSR_FP | |
3059 | #ifdef CONFIG_ALTIVEC | |
3060 | BEGIN_FTR_SECTION | |
3061 | oris r8,r8,MSR_VEC@h | |
3062 | END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) | |
3063 | #endif | |
3064 | #ifdef CONFIG_VSX | |
3065 | BEGIN_FTR_SECTION | |
3066 | oris r8,r8,MSR_VSX@h | |
3067 | END_FTR_SECTION_IFSET(CPU_FTR_VSX) | |
3068 | #endif | |
3069 | mtmsrd r8 | |
595e4f7e | 3070 | addi r3,r4,VCPU_FPRS |
9bf163f8 | 3071 | bl load_fp_state |
de56a948 PM |
3072 | #ifdef CONFIG_ALTIVEC |
3073 | BEGIN_FTR_SECTION | |
595e4f7e | 3074 | addi r3,r31,VCPU_VRS |
9bf163f8 | 3075 | bl load_vr_state |
de56a948 PM |
3076 | END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) |
3077 | #endif | |
e724f080 | 3078 | lwz r7,VCPU_VRSAVE(r31) |
de56a948 | 3079 | mtspr SPRN_VRSAVE,r7 |
595e4f7e PM |
3080 | mtlr r30 |
3081 | mr r4,r31 | |
de56a948 | 3082 | blr |
44a3add8 | 3083 | |
f024ee09 PM |
3084 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
3085 | /* | |
3086 | * Save transactional state and TM-related registers. | |
6f597c6b SG |
3087 | * Called with r3 pointing to the vcpu struct and r4 containing |
3088 | * the guest MSR value. | |
7854f754 PM |
3089 | * r5 is non-zero iff non-volatile register state needs to be maintained. |
3090 | * If r5 == 0, this can modify all checkpointed registers, but | |
6f597c6b | 3091 | * restores r1 and r2 before exit. |
f024ee09 | 3092 | */ |
7854f754 PM |
3093 | _GLOBAL_TOC(kvmppc_save_tm_hv) |
3094 | EXPORT_SYMBOL_GPL(kvmppc_save_tm_hv) | |
7b0e827c PM |
3095 | /* See if we need to handle fake suspend mode */ |
3096 | BEGIN_FTR_SECTION | |
caa3be92 | 3097 | b __kvmppc_save_tm |
7b0e827c PM |
3098 | END_FTR_SECTION_IFCLR(CPU_FTR_P9_TM_HV_ASSIST) |
3099 | ||
3100 | lbz r0, HSTATE_FAKE_SUSPEND(r13) /* Were we fake suspended? */ | |
3101 | cmpwi r0, 0 | |
caa3be92 | 3102 | beq __kvmppc_save_tm |
7b0e827c PM |
3103 | |
3104 | /* The following code handles the fake_suspend = 1 case */ | |
f024ee09 PM |
3105 | mflr r0 |
3106 | std r0, PPC_LR_STKOFF(r1) | |
87a11bb6 | 3107 | stdu r1, -PPC_MIN_STKFRM(r1) |
f024ee09 PM |
3108 | |
3109 | /* Turn on TM. */ | |
3110 | mfmsr r8 | |
3111 | li r0, 1 | |
3112 | rldimi r8, r0, MSR_TM_LG, 63-MSR_TM_LG | |
3113 | mtmsrd r8 | |
3114 | ||
87a11bb6 SJS |
3115 | rldicl. r8, r8, 64 - MSR_TS_S_LG, 62 /* Did we actually hrfid? */ |
3116 | beq 4f | |
7b0e827c | 3117 | BEGIN_FTR_SECTION |
87a11bb6 | 3118 | bl pnv_power9_force_smt4_catch |
7b0e827c | 3119 | END_FTR_SECTION_IFSET(CPU_FTR_P9_TM_XER_SO_BUG) |
87a11bb6 | 3120 | nop |
4bb3c7a0 | 3121 | |
7b0e827c PM |
3122 | /* We have to treclaim here because that's the only way to do S->N */ |
3123 | li r3, TM_CAUSE_KVM_RESCHED | |
f024ee09 PM |
3124 | TRECLAIM(R3) |
3125 | ||
4bb3c7a0 PM |
3126 | /* |
3127 | * We were in fake suspend, so we are not going to save the | |
3128 | * register state as the guest checkpointed state (since | |
3129 | * we already have it), therefore we can now use any volatile GPR. | |
7854f754 PM |
3130 | * In fact treclaim in fake suspend state doesn't modify |
3131 | * any registers. | |
4bb3c7a0 | 3132 | */ |
7b0e827c | 3133 | |
7854f754 | 3134 | BEGIN_FTR_SECTION |
87a11bb6 | 3135 | bl pnv_power9_force_smt4_release |
7854f754 | 3136 | END_FTR_SECTION_IFSET(CPU_FTR_P9_TM_XER_SO_BUG) |
87a11bb6 SJS |
3137 | nop |
3138 | ||
3139 | 4: | |
4bb3c7a0 PM |
3140 | mfspr r3, SPRN_PSSCR |
3141 | /* PSSCR_FAKE_SUSPEND is a write-only bit, but clear it anyway */ | |
3142 | li r0, PSSCR_FAKE_SUSPEND | |
3143 | andc r3, r3, r0 | |
3144 | mtspr SPRN_PSSCR, r3 | |
4bb3c7a0 | 3145 | |
681c617b | 3146 | /* Don't save TEXASR, use value from last exit in real suspend state */ |
f024ee09 | 3147 | ld r9, HSTATE_KVM_VCPU(r13) |
f024ee09 PM |
3148 | mfspr r5, SPRN_TFHAR |
3149 | mfspr r6, SPRN_TFIAR | |
f024ee09 PM |
3150 | std r5, VCPU_TFHAR(r9) |
3151 | std r6, VCPU_TFIAR(r9) | |
f024ee09 | 3152 | |
87a11bb6 | 3153 | addi r1, r1, PPC_MIN_STKFRM |
f024ee09 PM |
3154 | ld r0, PPC_LR_STKOFF(r1) |
3155 | mtlr r0 | |
3156 | blr | |
3157 | ||
3158 | /* | |
3159 | * Restore transactional state and TM-related registers. | |
6f597c6b SG |
3160 | * Called with r3 pointing to the vcpu struct |
3161 | * and r4 containing the guest MSR value. | |
7854f754 | 3162 | * r5 is non-zero iff non-volatile register state needs to be maintained. |
f024ee09 | 3163 | * This potentially modifies all checkpointed registers. |
6f597c6b | 3164 | * It restores r1 and r2 from the PACA. |
f024ee09 | 3165 | */ |
7854f754 PM |
3166 | _GLOBAL_TOC(kvmppc_restore_tm_hv) |
3167 | EXPORT_SYMBOL_GPL(kvmppc_restore_tm_hv) | |
7b0e827c PM |
3168 | /* |
3169 | * If we are doing TM emulation for the guest on a POWER9 DD2, | |
3170 | * then we don't actually do a trechkpt -- we either set up | |
3171 | * fake-suspend mode, or emulate a TM rollback. | |
3172 | */ | |
3173 | BEGIN_FTR_SECTION | |
caa3be92 | 3174 | b __kvmppc_restore_tm |
7b0e827c | 3175 | END_FTR_SECTION_IFCLR(CPU_FTR_P9_TM_HV_ASSIST) |
f024ee09 PM |
3176 | mflr r0 |
3177 | std r0, PPC_LR_STKOFF(r1) | |
3178 | ||
7b0e827c PM |
3179 | li r0, 0 |
3180 | stb r0, HSTATE_FAKE_SUSPEND(r13) | |
3181 | ||
3182 | /* Turn on TM so we can restore TM SPRs */ | |
f024ee09 | 3183 | mfmsr r5 |
7b0e827c PM |
3184 | li r0, 1 |
3185 | rldimi r5, r0, MSR_TM_LG, 63-MSR_TM_LG | |
f024ee09 PM |
3186 | mtmsrd r5 |
3187 | ||
3188 | /* | |
3189 | * The user may change these outside of a transaction, so they must | |
3190 | * always be context switched. | |
3191 | */ | |
6f597c6b SG |
3192 | ld r5, VCPU_TFHAR(r3) |
3193 | ld r6, VCPU_TFIAR(r3) | |
3194 | ld r7, VCPU_TEXASR(r3) | |
f024ee09 PM |
3195 | mtspr SPRN_TFHAR, r5 |
3196 | mtspr SPRN_TFIAR, r6 | |
3197 | mtspr SPRN_TEXASR, r7 | |
3198 | ||
6f597c6b | 3199 | rldicl. r5, r4, 64 - MSR_TS_S_LG, 62 |
f024ee09 | 3200 | beqlr /* TM not active in guest */ |
f024ee09 | 3201 | |
7b0e827c | 3202 | /* Make sure the failure summary is set */ |
f024ee09 PM |
3203 | oris r7, r7, (TEXASR_FS)@h |
3204 | mtspr SPRN_TEXASR, r7 | |
3205 | ||
4bb3c7a0 PM |
3206 | cmpwi r5, 1 /* check for suspended state */ |
3207 | bgt 10f | |
3208 | stb r5, HSTATE_FAKE_SUSPEND(r13) | |
7b0e827c | 3209 | b 9f /* and return */ |
4bb3c7a0 PM |
3210 | 10: stdu r1, -PPC_MIN_STKFRM(r1) |
3211 | /* guest is in transactional state, so simulate rollback */ | |
4bb3c7a0 PM |
3212 | bl kvmhv_emulate_tm_rollback |
3213 | nop | |
4bb3c7a0 | 3214 | addi r1, r1, PPC_MIN_STKFRM |
7b0e827c PM |
3215 | 9: ld r0, PPC_LR_STKOFF(r1) |
3216 | mtlr r0 | |
3217 | blr | |
7b0e827c | 3218 | #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ |
f024ee09 | 3219 | |
44a3add8 PM |
3220 | /* |
3221 | * We come here if we get any exception or interrupt while we are | |
3222 | * executing host real mode code while in guest MMU context. | |
857b99e1 PM |
3223 | * r12 is (CR << 32) | vector |
3224 | * r13 points to our PACA | |
3225 | * r12 is saved in HSTATE_SCRATCH0(r13) | |
3226 | * ctr is saved in HSTATE_SCRATCH1(r13) if RELOCATABLE | |
3227 | * r9 is saved in HSTATE_SCRATCH2(r13) | |
3228 | * r13 is saved in HSPRG1 | |
3229 | * cfar is saved in HSTATE_CFAR(r13) | |
3230 | * ppr is saved in HSTATE_PPR(r13) | |
44a3add8 PM |
3231 | */ |
3232 | kvmppc_bad_host_intr: | |
857b99e1 PM |
3233 | /* |
3234 | * Switch to the emergency stack, but start half-way down in | |
3235 | * case we were already on it. | |
3236 | */ | |
3237 | mr r9, r1 | |
3238 | std r1, PACAR1(r13) | |
3239 | ld r1, PACAEMERGSP(r13) | |
3240 | subi r1, r1, THREAD_SIZE/2 + INT_FRAME_SIZE | |
3241 | std r9, 0(r1) | |
3242 | std r0, GPR0(r1) | |
3243 | std r9, GPR1(r1) | |
3244 | std r2, GPR2(r1) | |
3245 | SAVE_4GPRS(3, r1) | |
3246 | SAVE_2GPRS(7, r1) | |
3247 | srdi r0, r12, 32 | |
3248 | clrldi r12, r12, 32 | |
3249 | std r0, _CCR(r1) | |
3250 | std r12, _TRAP(r1) | |
3251 | andi. r0, r12, 2 | |
3252 | beq 1f | |
3253 | mfspr r3, SPRN_HSRR0 | |
3254 | mfspr r4, SPRN_HSRR1 | |
3255 | mfspr r5, SPRN_HDAR | |
3256 | mfspr r6, SPRN_HDSISR | |
3257 | b 2f | |
3258 | 1: mfspr r3, SPRN_SRR0 | |
3259 | mfspr r4, SPRN_SRR1 | |
3260 | mfspr r5, SPRN_DAR | |
3261 | mfspr r6, SPRN_DSISR | |
3262 | 2: std r3, _NIP(r1) | |
3263 | std r4, _MSR(r1) | |
3264 | std r5, _DAR(r1) | |
3265 | std r6, _DSISR(r1) | |
3266 | ld r9, HSTATE_SCRATCH2(r13) | |
3267 | ld r12, HSTATE_SCRATCH0(r13) | |
3268 | GET_SCRATCH0(r0) | |
3269 | SAVE_4GPRS(9, r1) | |
3270 | std r0, GPR13(r1) | |
3271 | SAVE_NVGPRS(r1) | |
3272 | ld r5, HSTATE_CFAR(r13) | |
3273 | std r5, ORIG_GPR3(r1) | |
3274 | mflr r3 | |
3275 | #ifdef CONFIG_RELOCATABLE | |
3276 | ld r4, HSTATE_SCRATCH1(r13) | |
3277 | #else | |
3278 | mfctr r4 | |
3279 | #endif | |
3280 | mfxer r5 | |
4e26bc4a | 3281 | lbz r6, PACAIRQSOFTMASK(r13) |
857b99e1 PM |
3282 | std r3, _LINK(r1) |
3283 | std r4, _CTR(r1) | |
3284 | std r5, _XER(r1) | |
3285 | std r6, SOFTE(r1) | |
3286 | ld r2, PACATOC(r13) | |
3287 | LOAD_REG_IMMEDIATE(3, 0x7265677368657265) | |
3288 | std r3, STACK_FRAME_OVERHEAD-16(r1) | |
3289 | ||
3290 | /* | |
3291 | * On POWER9 do a minimal restore of the MMU and call C code, | |
3292 | * which will print a message and panic. | |
3293 | * XXX On POWER7 and POWER8, we just spin here since we don't | |
3294 | * know what the other threads are doing (and we don't want to | |
3295 | * coordinate with them) - but at least we now have register state | |
3296 | * in memory that we might be able to look at from another CPU. | |
3297 | */ | |
3298 | BEGIN_FTR_SECTION | |
44a3add8 | 3299 | b . |
857b99e1 PM |
3300 | END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300) |
3301 | ld r9, HSTATE_KVM_VCPU(r13) | |
3302 | ld r10, VCPU_KVM(r9) | |
3303 | ||
3304 | li r0, 0 | |
3305 | mtspr SPRN_AMR, r0 | |
3306 | mtspr SPRN_IAMR, r0 | |
3307 | mtspr SPRN_CIABR, r0 | |
3308 | mtspr SPRN_DAWRX, r0 | |
3309 | ||
857b99e1 PM |
3310 | BEGIN_MMU_FTR_SECTION |
3311 | b 4f | |
3312 | END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_RADIX) | |
3313 | ||
3314 | slbmte r0, r0 | |
3315 | slbia | |
3316 | ptesync | |
3317 | ld r8, PACA_SLBSHADOWPTR(r13) | |
3318 | .rept SLB_NUM_BOLTED | |
3319 | li r3, SLBSHADOW_SAVEAREA | |
3320 | LDX_BE r5, r8, r3 | |
3321 | addi r3, r3, 8 | |
3322 | LDX_BE r6, r8, r3 | |
3323 | andis. r7, r5, SLB_ESID_V@h | |
3324 | beq 3f | |
3325 | slbmte r6, r5 | |
3326 | 3: addi r8, r8, 16 | |
3327 | .endr | |
3328 | ||
3329 | 4: lwz r7, KVM_HOST_LPID(r10) | |
3330 | mtspr SPRN_LPID, r7 | |
3331 | mtspr SPRN_PID, r0 | |
3332 | ld r8, KVM_HOST_LPCR(r10) | |
3333 | mtspr SPRN_LPCR, r8 | |
3334 | isync | |
3335 | li r0, KVM_GUEST_MODE_NONE | |
3336 | stb r0, HSTATE_IN_GUEST(r13) | |
3337 | ||
3338 | /* | |
3339 | * Turn on the MMU and jump to C code | |
3340 | */ | |
3341 | bcl 20, 31, .+4 | |
3342 | 5: mflr r3 | |
3343 | addi r3, r3, 9f - 5b | |
eadce3b4 NP |
3344 | li r4, -1 |
3345 | rldimi r3, r4, 62, 0 /* ensure 0xc000000000000000 bits are set */ | |
857b99e1 PM |
3346 | ld r4, PACAKMSR(r13) |
3347 | mtspr SPRN_SRR0, r3 | |
3348 | mtspr SPRN_SRR1, r4 | |
222f20f1 | 3349 | RFI_TO_KERNEL |
857b99e1 PM |
3350 | 9: addi r3, r1, STACK_FRAME_OVERHEAD |
3351 | bl kvmppc_bad_interrupt | |
3352 | b 9b | |
e4e38121 MN |
3353 | |
3354 | /* | |
3355 | * This mimics the MSR transition on IRQ delivery. The new guest MSR is taken | |
3356 | * from VCPU_INTR_MSR and is modified based on the required TM state changes. | |
3357 | * r11 has the guest MSR value (in/out) | |
3358 | * r9 has a vcpu pointer (in) | |
3359 | * r0 is used as a scratch register | |
3360 | */ | |
3361 | kvmppc_msr_interrupt: | |
3362 | rldicl r0, r11, 64 - MSR_TS_S_LG, 62 | |
3363 | cmpwi r0, 2 /* Check if we are in transactional state.. */ | |
3364 | ld r11, VCPU_INTR_MSR(r9) | |
3365 | bne 1f | |
3366 | /* ... if transactional, change to suspended */ | |
3367 | li r0, 1 | |
3368 | 1: rldimi r11, r0, MSR_TS_S_LG, 63 - MSR_TS_T_LG | |
3369 | blr | |
9bc01a9b | 3370 | |
41f4e631 PM |
3371 | /* |
3372 | * Load up guest PMU state. R3 points to the vcpu struct. | |
3373 | */ | |
3374 | _GLOBAL(kvmhv_load_guest_pmu) | |
3375 | EXPORT_SYMBOL_GPL(kvmhv_load_guest_pmu) | |
3376 | mr r4, r3 | |
3377 | mflr r0 | |
3378 | li r3, 1 | |
3379 | sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ | |
3380 | mtspr SPRN_MMCR0, r3 /* freeze all counters, disable ints */ | |
3381 | isync | |
3382 | BEGIN_FTR_SECTION | |
3383 | ld r3, VCPU_MMCR(r4) | |
3384 | andi. r5, r3, MMCR0_PMAO_SYNC | MMCR0_PMAO | |
3385 | cmpwi r5, MMCR0_PMAO | |
3386 | beql kvmppc_fix_pmao | |
3387 | END_FTR_SECTION_IFSET(CPU_FTR_PMAO_BUG) | |
3388 | lwz r3, VCPU_PMC(r4) /* always load up guest PMU registers */ | |
3389 | lwz r5, VCPU_PMC + 4(r4) /* to prevent information leak */ | |
3390 | lwz r6, VCPU_PMC + 8(r4) | |
3391 | lwz r7, VCPU_PMC + 12(r4) | |
3392 | lwz r8, VCPU_PMC + 16(r4) | |
3393 | lwz r9, VCPU_PMC + 20(r4) | |
3394 | mtspr SPRN_PMC1, r3 | |
3395 | mtspr SPRN_PMC2, r5 | |
3396 | mtspr SPRN_PMC3, r6 | |
3397 | mtspr SPRN_PMC4, r7 | |
3398 | mtspr SPRN_PMC5, r8 | |
3399 | mtspr SPRN_PMC6, r9 | |
3400 | ld r3, VCPU_MMCR(r4) | |
3401 | ld r5, VCPU_MMCR + 8(r4) | |
3402 | ld r6, VCPU_MMCR + 16(r4) | |
3403 | ld r7, VCPU_SIAR(r4) | |
3404 | ld r8, VCPU_SDAR(r4) | |
3405 | mtspr SPRN_MMCR1, r5 | |
3406 | mtspr SPRN_MMCRA, r6 | |
3407 | mtspr SPRN_SIAR, r7 | |
3408 | mtspr SPRN_SDAR, r8 | |
3409 | BEGIN_FTR_SECTION | |
3410 | ld r5, VCPU_MMCR + 24(r4) | |
3411 | ld r6, VCPU_SIER(r4) | |
3412 | mtspr SPRN_MMCR2, r5 | |
3413 | mtspr SPRN_SIER, r6 | |
3414 | BEGIN_FTR_SECTION_NESTED(96) | |
3415 | lwz r7, VCPU_PMC + 24(r4) | |
3416 | lwz r8, VCPU_PMC + 28(r4) | |
3417 | ld r9, VCPU_MMCR + 32(r4) | |
3418 | mtspr SPRN_SPMC1, r7 | |
3419 | mtspr SPRN_SPMC2, r8 | |
3420 | mtspr SPRN_MMCRS, r9 | |
3421 | END_FTR_SECTION_NESTED(CPU_FTR_ARCH_300, 0, 96) | |
3422 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) | |
3423 | mtspr SPRN_MMCR0, r3 | |
3424 | isync | |
3425 | mtlr r0 | |
3426 | blr | |
3427 | ||
3428 | /* | |
3429 | * Reload host PMU state saved in the PACA by kvmhv_save_host_pmu. | |
3430 | */ | |
3431 | _GLOBAL(kvmhv_load_host_pmu) | |
3432 | EXPORT_SYMBOL_GPL(kvmhv_load_host_pmu) | |
3433 | mflr r0 | |
3434 | lbz r4, PACA_PMCINUSE(r13) /* is the host using the PMU? */ | |
3435 | cmpwi r4, 0 | |
3436 | beq 23f /* skip if not */ | |
3437 | BEGIN_FTR_SECTION | |
3438 | ld r3, HSTATE_MMCR0(r13) | |
3439 | andi. r4, r3, MMCR0_PMAO_SYNC | MMCR0_PMAO | |
3440 | cmpwi r4, MMCR0_PMAO | |
3441 | beql kvmppc_fix_pmao | |
3442 | END_FTR_SECTION_IFSET(CPU_FTR_PMAO_BUG) | |
3443 | lwz r3, HSTATE_PMC1(r13) | |
3444 | lwz r4, HSTATE_PMC2(r13) | |
3445 | lwz r5, HSTATE_PMC3(r13) | |
3446 | lwz r6, HSTATE_PMC4(r13) | |
3447 | lwz r8, HSTATE_PMC5(r13) | |
3448 | lwz r9, HSTATE_PMC6(r13) | |
3449 | mtspr SPRN_PMC1, r3 | |
3450 | mtspr SPRN_PMC2, r4 | |
3451 | mtspr SPRN_PMC3, r5 | |
3452 | mtspr SPRN_PMC4, r6 | |
3453 | mtspr SPRN_PMC5, r8 | |
3454 | mtspr SPRN_PMC6, r9 | |
3455 | ld r3, HSTATE_MMCR0(r13) | |
3456 | ld r4, HSTATE_MMCR1(r13) | |
3457 | ld r5, HSTATE_MMCRA(r13) | |
3458 | ld r6, HSTATE_SIAR(r13) | |
3459 | ld r7, HSTATE_SDAR(r13) | |
3460 | mtspr SPRN_MMCR1, r4 | |
3461 | mtspr SPRN_MMCRA, r5 | |
3462 | mtspr SPRN_SIAR, r6 | |
3463 | mtspr SPRN_SDAR, r7 | |
3464 | BEGIN_FTR_SECTION | |
3465 | ld r8, HSTATE_MMCR2(r13) | |
3466 | ld r9, HSTATE_SIER(r13) | |
3467 | mtspr SPRN_MMCR2, r8 | |
3468 | mtspr SPRN_SIER, r9 | |
3469 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) | |
3470 | mtspr SPRN_MMCR0, r3 | |
3471 | isync | |
3472 | mtlr r0 | |
3473 | 23: blr | |
3474 | ||
3475 | /* | |
3476 | * Save guest PMU state into the vcpu struct. | |
3477 | * r3 = vcpu, r4 = full save flag (PMU in use flag set in VPA) | |
3478 | */ | |
3479 | _GLOBAL(kvmhv_save_guest_pmu) | |
3480 | EXPORT_SYMBOL_GPL(kvmhv_save_guest_pmu) | |
3481 | mr r9, r3 | |
3482 | mr r8, r4 | |
3483 | BEGIN_FTR_SECTION | |
3484 | /* | |
3485 | * POWER8 seems to have a hardware bug where setting | |
3486 | * MMCR0[PMAE] along with MMCR0[PMC1CE] and/or MMCR0[PMCjCE] | |
3487 | * when some counters are already negative doesn't seem | |
3488 | * to cause a performance monitor alert (and hence interrupt). | |
3489 | * The effect of this is that when saving the PMU state, | |
3490 | * if there is no PMU alert pending when we read MMCR0 | |
3491 | * before freezing the counters, but one becomes pending | |
3492 | * before we read the counters, we lose it. | |
3493 | * To work around this, we need a way to freeze the counters | |
3494 | * before reading MMCR0. Normally, freezing the counters | |
3495 | * is done by writing MMCR0 (to set MMCR0[FC]) which | |
3496 | * unavoidably writes MMCR0[PMA0] as well. On POWER8, | |
3497 | * we can also freeze the counters using MMCR2, by writing | |
3498 | * 1s to all the counter freeze condition bits (there are | |
3499 | * 9 bits each for 6 counters). | |
3500 | */ | |
3501 | li r3, -1 /* set all freeze bits */ | |
3502 | clrrdi r3, r3, 10 | |
3503 | mfspr r10, SPRN_MMCR2 | |
3504 | mtspr SPRN_MMCR2, r3 | |
3505 | isync | |
3506 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) | |
3507 | li r3, 1 | |
3508 | sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ | |
3509 | mfspr r4, SPRN_MMCR0 /* save MMCR0 */ | |
3510 | mtspr SPRN_MMCR0, r3 /* freeze all counters, disable ints */ | |
3511 | mfspr r6, SPRN_MMCRA | |
3512 | /* Clear MMCRA in order to disable SDAR updates */ | |
3513 | li r7, 0 | |
3514 | mtspr SPRN_MMCRA, r7 | |
3515 | isync | |
3516 | cmpwi r8, 0 /* did they ask for PMU stuff to be saved? */ | |
3517 | bne 21f | |
3518 | std r3, VCPU_MMCR(r9) /* if not, set saved MMCR0 to FC */ | |
3519 | b 22f | |
3520 | 21: mfspr r5, SPRN_MMCR1 | |
3521 | mfspr r7, SPRN_SIAR | |
3522 | mfspr r8, SPRN_SDAR | |
3523 | std r4, VCPU_MMCR(r9) | |
3524 | std r5, VCPU_MMCR + 8(r9) | |
3525 | std r6, VCPU_MMCR + 16(r9) | |
3526 | BEGIN_FTR_SECTION | |
3527 | std r10, VCPU_MMCR + 24(r9) | |
3528 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) | |
3529 | std r7, VCPU_SIAR(r9) | |
3530 | std r8, VCPU_SDAR(r9) | |
3531 | mfspr r3, SPRN_PMC1 | |
3532 | mfspr r4, SPRN_PMC2 | |
3533 | mfspr r5, SPRN_PMC3 | |
3534 | mfspr r6, SPRN_PMC4 | |
3535 | mfspr r7, SPRN_PMC5 | |
3536 | mfspr r8, SPRN_PMC6 | |
3537 | stw r3, VCPU_PMC(r9) | |
3538 | stw r4, VCPU_PMC + 4(r9) | |
3539 | stw r5, VCPU_PMC + 8(r9) | |
3540 | stw r6, VCPU_PMC + 12(r9) | |
3541 | stw r7, VCPU_PMC + 16(r9) | |
3542 | stw r8, VCPU_PMC + 20(r9) | |
3543 | BEGIN_FTR_SECTION | |
3544 | mfspr r5, SPRN_SIER | |
3545 | std r5, VCPU_SIER(r9) | |
3546 | BEGIN_FTR_SECTION_NESTED(96) | |
3547 | mfspr r6, SPRN_SPMC1 | |
3548 | mfspr r7, SPRN_SPMC2 | |
3549 | mfspr r8, SPRN_MMCRS | |
3550 | stw r6, VCPU_PMC + 24(r9) | |
3551 | stw r7, VCPU_PMC + 28(r9) | |
3552 | std r8, VCPU_MMCR + 32(r9) | |
3553 | lis r4, 0x8000 | |
3554 | mtspr SPRN_MMCRS, r4 | |
3555 | END_FTR_SECTION_NESTED(CPU_FTR_ARCH_300, 0, 96) | |
3556 | END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) | |
3557 | 22: blr | |
3558 | ||
9bc01a9b PM |
3559 | /* |
3560 | * This works around a hardware bug on POWER8E processors, where | |
3561 | * writing a 1 to the MMCR0[PMAO] bit doesn't generate a | |
3562 | * performance monitor interrupt. Instead, when we need to have | |
3563 | * an interrupt pending, we have to arrange for a counter to overflow. | |
3564 | */ | |
3565 | kvmppc_fix_pmao: | |
3566 | li r3, 0 | |
3567 | mtspr SPRN_MMCR2, r3 | |
3568 | lis r3, (MMCR0_PMXE | MMCR0_FCECE)@h | |
3569 | ori r3, r3, MMCR0_PMCjCE | MMCR0_C56RUN | |
3570 | mtspr SPRN_MMCR0, r3 | |
3571 | lis r3, 0x7fff | |
3572 | ori r3, r3, 0xffff | |
3573 | mtspr SPRN_PMC6, r3 | |
3574 | isync | |
3575 | blr | |
b6c295df PM |
3576 | |
3577 | #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING | |
3578 | /* | |
3579 | * Start timing an activity | |
3580 | * r3 = pointer to time accumulation struct, r4 = vcpu | |
3581 | */ | |
3582 | kvmhv_start_timing: | |
3583 | ld r5, HSTATE_KVM_VCORE(r13) | |
57b8daa7 PM |
3584 | ld r6, VCORE_TB_OFFSET_APPL(r5) |
3585 | mftb r5 | |
3586 | subf r5, r6, r5 /* subtract current timebase offset */ | |
b6c295df PM |
3587 | std r3, VCPU_CUR_ACTIVITY(r4) |
3588 | std r5, VCPU_ACTIVITY_START(r4) | |
3589 | blr | |
3590 | ||
3591 | /* | |
3592 | * Accumulate time to one activity and start another. | |
3593 | * r3 = pointer to new time accumulation struct, r4 = vcpu | |
3594 | */ | |
3595 | kvmhv_accumulate_time: | |
3596 | ld r5, HSTATE_KVM_VCORE(r13) | |
57b8daa7 PM |
3597 | ld r8, VCORE_TB_OFFSET_APPL(r5) |
3598 | ld r5, VCPU_CUR_ACTIVITY(r4) | |
b6c295df PM |
3599 | ld r6, VCPU_ACTIVITY_START(r4) |
3600 | std r3, VCPU_CUR_ACTIVITY(r4) | |
3601 | mftb r7 | |
57b8daa7 | 3602 | subf r7, r8, r7 /* subtract current timebase offset */ |
b6c295df PM |
3603 | std r7, VCPU_ACTIVITY_START(r4) |
3604 | cmpdi r5, 0 | |
3605 | beqlr | |
3606 | subf r3, r6, r7 | |
3607 | ld r8, TAS_SEQCOUNT(r5) | |
3608 | cmpdi r8, 0 | |
3609 | addi r8, r8, 1 | |
3610 | std r8, TAS_SEQCOUNT(r5) | |
3611 | lwsync | |
3612 | ld r7, TAS_TOTAL(r5) | |
3613 | add r7, r7, r3 | |
3614 | std r7, TAS_TOTAL(r5) | |
3615 | ld r6, TAS_MIN(r5) | |
3616 | ld r7, TAS_MAX(r5) | |
3617 | beq 3f | |
3618 | cmpd r3, r6 | |
3619 | bge 1f | |
3620 | 3: std r3, TAS_MIN(r5) | |
3621 | 1: cmpd r3, r7 | |
3622 | ble 2f | |
3623 | std r3, TAS_MAX(r5) | |
3624 | 2: lwsync | |
3625 | addi r8, r8, 1 | |
3626 | std r8, TAS_SEQCOUNT(r5) | |
3627 | blr | |
3628 | #endif |