arm64: KVM: Describe data or unified caches as having 1 set and 1 way
[linux-2.6-block.git] / arch / arm64 / include / asm / kvm_emulate.h
1 /*
2  * Copyright (C) 2012,2013 - ARM Ltd
3  * Author: Marc Zyngier <marc.zyngier@arm.com>
4  *
5  * Derived from arch/arm/include/kvm_emulate.h
6  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
7  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
20  */
21
22 #ifndef __ARM64_KVM_EMULATE_H__
23 #define __ARM64_KVM_EMULATE_H__
24
25 #include <linux/kvm_host.h>
26
27 #include <asm/debug-monitors.h>
28 #include <asm/esr.h>
29 #include <asm/kvm_arm.h>
30 #include <asm/kvm_hyp.h>
31 #include <asm/kvm_mmio.h>
32 #include <asm/ptrace.h>
33 #include <asm/cputype.h>
34 #include <asm/virt.h>
35
36 unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num);
37 unsigned long vcpu_read_spsr32(const struct kvm_vcpu *vcpu);
38 void vcpu_write_spsr32(struct kvm_vcpu *vcpu, unsigned long v);
39
40 bool kvm_condition_valid32(const struct kvm_vcpu *vcpu);
41 void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr);
42
43 void kvm_inject_undefined(struct kvm_vcpu *vcpu);
44 void kvm_inject_vabt(struct kvm_vcpu *vcpu);
45 void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
46 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
47 void kvm_inject_undef32(struct kvm_vcpu *vcpu);
48 void kvm_inject_dabt32(struct kvm_vcpu *vcpu, unsigned long addr);
49 void kvm_inject_pabt32(struct kvm_vcpu *vcpu, unsigned long addr);
50
51 static inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
52 {
53         return !(vcpu->arch.hcr_el2 & HCR_RW);
54 }
55
56 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
57 {
58         vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
59         if (is_kernel_in_hyp_mode())
60                 vcpu->arch.hcr_el2 |= HCR_E2H;
61         if (cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) {
62                 /* route synchronous external abort exceptions to EL2 */
63                 vcpu->arch.hcr_el2 |= HCR_TEA;
64                 /* trap error record accesses */
65                 vcpu->arch.hcr_el2 |= HCR_TERR;
66         }
67         if (cpus_have_const_cap(ARM64_HAS_STAGE2_FWB))
68                 vcpu->arch.hcr_el2 |= HCR_FWB;
69
70         if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features))
71                 vcpu->arch.hcr_el2 &= ~HCR_RW;
72
73         /*
74          * TID3: trap feature register accesses that we virtualise.
75          * For now this is conditional, since no AArch32 feature regs
76          * are currently virtualised.
77          */
78         if (!vcpu_el1_is_32bit(vcpu))
79                 vcpu->arch.hcr_el2 |= HCR_TID3;
80
81         if (cpus_have_const_cap(ARM64_MISMATCHED_CACHE_TYPE) ||
82             vcpu_el1_is_32bit(vcpu))
83                 vcpu->arch.hcr_el2 |= HCR_TID2;
84 }
85
86 static inline unsigned long *vcpu_hcr(struct kvm_vcpu *vcpu)
87 {
88         return (unsigned long *)&vcpu->arch.hcr_el2;
89 }
90
91 static inline void vcpu_clear_wfe_traps(struct kvm_vcpu *vcpu)
92 {
93         vcpu->arch.hcr_el2 &= ~HCR_TWE;
94 }
95
96 static inline void vcpu_set_wfe_traps(struct kvm_vcpu *vcpu)
97 {
98         vcpu->arch.hcr_el2 |= HCR_TWE;
99 }
100
101 static inline unsigned long vcpu_get_vsesr(struct kvm_vcpu *vcpu)
102 {
103         return vcpu->arch.vsesr_el2;
104 }
105
106 static inline void vcpu_set_vsesr(struct kvm_vcpu *vcpu, u64 vsesr)
107 {
108         vcpu->arch.vsesr_el2 = vsesr;
109 }
110
111 static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu)
112 {
113         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc;
114 }
115
116 static inline unsigned long *__vcpu_elr_el1(const struct kvm_vcpu *vcpu)
117 {
118         return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1;
119 }
120
121 static inline unsigned long vcpu_read_elr_el1(const struct kvm_vcpu *vcpu)
122 {
123         if (vcpu->arch.sysregs_loaded_on_cpu)
124                 return read_sysreg_el1(elr);
125         else
126                 return *__vcpu_elr_el1(vcpu);
127 }
128
129 static inline void vcpu_write_elr_el1(const struct kvm_vcpu *vcpu, unsigned long v)
130 {
131         if (vcpu->arch.sysregs_loaded_on_cpu)
132                 write_sysreg_el1(v, elr);
133         else
134                 *__vcpu_elr_el1(vcpu) = v;
135 }
136
137 static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
138 {
139         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate;
140 }
141
142 static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
143 {
144         return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT);
145 }
146
147 static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
148 {
149         if (vcpu_mode_is_32bit(vcpu))
150                 return kvm_condition_valid32(vcpu);
151
152         return true;
153 }
154
155 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
156 {
157         *vcpu_cpsr(vcpu) |= PSR_AA32_T_BIT;
158 }
159
160 /*
161  * vcpu_get_reg and vcpu_set_reg should always be passed a register number
162  * coming from a read of ESR_EL2. Otherwise, it may give the wrong result on
163  * AArch32 with banked registers.
164  */
165 static inline unsigned long vcpu_get_reg(const struct kvm_vcpu *vcpu,
166                                          u8 reg_num)
167 {
168         return (reg_num == 31) ? 0 : vcpu_gp_regs(vcpu)->regs.regs[reg_num];
169 }
170
171 static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
172                                 unsigned long val)
173 {
174         if (reg_num != 31)
175                 vcpu_gp_regs(vcpu)->regs.regs[reg_num] = val;
176 }
177
178 static inline unsigned long vcpu_read_spsr(const struct kvm_vcpu *vcpu)
179 {
180         if (vcpu_mode_is_32bit(vcpu))
181                 return vcpu_read_spsr32(vcpu);
182
183         if (vcpu->arch.sysregs_loaded_on_cpu)
184                 return read_sysreg_el1(spsr);
185         else
186                 return vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1];
187 }
188
189 static inline void vcpu_write_spsr(struct kvm_vcpu *vcpu, unsigned long v)
190 {
191         if (vcpu_mode_is_32bit(vcpu)) {
192                 vcpu_write_spsr32(vcpu, v);
193                 return;
194         }
195
196         if (vcpu->arch.sysregs_loaded_on_cpu)
197                 write_sysreg_el1(v, spsr);
198         else
199                 vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1] = v;
200 }
201
202 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
203 {
204         u32 mode;
205
206         if (vcpu_mode_is_32bit(vcpu)) {
207                 mode = *vcpu_cpsr(vcpu) & PSR_AA32_MODE_MASK;
208                 return mode > PSR_AA32_MODE_USR;
209         }
210
211         mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
212
213         return mode != PSR_MODE_EL0t;
214 }
215
216 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu)
217 {
218         return vcpu->arch.fault.esr_el2;
219 }
220
221 static inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu)
222 {
223         u32 esr = kvm_vcpu_get_hsr(vcpu);
224
225         if (esr & ESR_ELx_CV)
226                 return (esr & ESR_ELx_COND_MASK) >> ESR_ELx_COND_SHIFT;
227
228         return -1;
229 }
230
231 static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu)
232 {
233         return vcpu->arch.fault.far_el2;
234 }
235
236 static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu)
237 {
238         return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8;
239 }
240
241 static inline u64 kvm_vcpu_get_disr(const struct kvm_vcpu *vcpu)
242 {
243         return vcpu->arch.fault.disr_el1;
244 }
245
246 static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu)
247 {
248         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_xVC_IMM_MASK;
249 }
250
251 static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
252 {
253         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISV);
254 }
255
256 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu)
257 {
258         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE);
259 }
260
261 static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
262 {
263         return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT;
264 }
265
266 static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu)
267 {
268         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_S1PTW);
269 }
270
271 static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
272 {
273         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WNR) ||
274                 kvm_vcpu_dabt_iss1tw(vcpu); /* AF/DBM update */
275 }
276
277 static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu)
278 {
279         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_CM);
280 }
281
282 static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
283 {
284         return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT);
285 }
286
287 /* This one is not specific to Data Abort */
288 static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu)
289 {
290         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_IL);
291 }
292
293 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu)
294 {
295         return ESR_ELx_EC(kvm_vcpu_get_hsr(vcpu));
296 }
297
298 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu)
299 {
300         return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW;
301 }
302
303 static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
304 {
305         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC;
306 }
307
308 static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu)
309 {
310         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC_TYPE;
311 }
312
313 static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu)
314 {
315         switch (kvm_vcpu_trap_get_fault(vcpu)) {
316         case FSC_SEA:
317         case FSC_SEA_TTW0:
318         case FSC_SEA_TTW1:
319         case FSC_SEA_TTW2:
320         case FSC_SEA_TTW3:
321         case FSC_SECC:
322         case FSC_SECC_TTW0:
323         case FSC_SECC_TTW1:
324         case FSC_SECC_TTW2:
325         case FSC_SECC_TTW3:
326                 return true;
327         default:
328                 return false;
329         }
330 }
331
332 static inline int kvm_vcpu_sys_get_rt(struct kvm_vcpu *vcpu)
333 {
334         u32 esr = kvm_vcpu_get_hsr(vcpu);
335         return ESR_ELx_SYS64_ISS_RT(esr);
336 }
337
338 static inline bool kvm_is_write_fault(struct kvm_vcpu *vcpu)
339 {
340         if (kvm_vcpu_trap_is_iabt(vcpu))
341                 return false;
342
343         return kvm_vcpu_dabt_iswrite(vcpu);
344 }
345
346 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
347 {
348         return vcpu_read_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK;
349 }
350
351 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
352 {
353         if (vcpu_mode_is_32bit(vcpu)) {
354                 *vcpu_cpsr(vcpu) |= PSR_AA32_E_BIT;
355         } else {
356                 u64 sctlr = vcpu_read_sys_reg(vcpu, SCTLR_EL1);
357                 sctlr |= (1 << 25);
358                 vcpu_write_sys_reg(vcpu, sctlr, SCTLR_EL1);
359         }
360 }
361
362 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
363 {
364         if (vcpu_mode_is_32bit(vcpu))
365                 return !!(*vcpu_cpsr(vcpu) & PSR_AA32_E_BIT);
366
367         return !!(vcpu_read_sys_reg(vcpu, SCTLR_EL1) & (1 << 25));
368 }
369
370 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
371                                                     unsigned long data,
372                                                     unsigned int len)
373 {
374         if (kvm_vcpu_is_be(vcpu)) {
375                 switch (len) {
376                 case 1:
377                         return data & 0xff;
378                 case 2:
379                         return be16_to_cpu(data & 0xffff);
380                 case 4:
381                         return be32_to_cpu(data & 0xffffffff);
382                 default:
383                         return be64_to_cpu(data);
384                 }
385         } else {
386                 switch (len) {
387                 case 1:
388                         return data & 0xff;
389                 case 2:
390                         return le16_to_cpu(data & 0xffff);
391                 case 4:
392                         return le32_to_cpu(data & 0xffffffff);
393                 default:
394                         return le64_to_cpu(data);
395                 }
396         }
397
398         return data;            /* Leave LE untouched */
399 }
400
401 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
402                                                     unsigned long data,
403                                                     unsigned int len)
404 {
405         if (kvm_vcpu_is_be(vcpu)) {
406                 switch (len) {
407                 case 1:
408                         return data & 0xff;
409                 case 2:
410                         return cpu_to_be16(data & 0xffff);
411                 case 4:
412                         return cpu_to_be32(data & 0xffffffff);
413                 default:
414                         return cpu_to_be64(data);
415                 }
416         } else {
417                 switch (len) {
418                 case 1:
419                         return data & 0xff;
420                 case 2:
421                         return cpu_to_le16(data & 0xffff);
422                 case 4:
423                         return cpu_to_le32(data & 0xffffffff);
424                 default:
425                         return cpu_to_le64(data);
426                 }
427         }
428
429         return data;            /* Leave LE untouched */
430 }
431
432 static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
433 {
434         if (vcpu_mode_is_32bit(vcpu))
435                 kvm_skip_instr32(vcpu, is_wide_instr);
436         else
437                 *vcpu_pc(vcpu) += 4;
438
439         /* advance the singlestep state machine */
440         *vcpu_cpsr(vcpu) &= ~DBG_SPSR_SS;
441 }
442
443 /*
444  * Skip an instruction which has been emulated at hyp while most guest sysregs
445  * are live.
446  */
447 static inline void __hyp_text __kvm_skip_instr(struct kvm_vcpu *vcpu)
448 {
449         *vcpu_pc(vcpu) = read_sysreg_el2(elr);
450         vcpu->arch.ctxt.gp_regs.regs.pstate = read_sysreg_el2(spsr);
451
452         kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
453
454         write_sysreg_el2(vcpu->arch.ctxt.gp_regs.regs.pstate, spsr);
455         write_sysreg_el2(*vcpu_pc(vcpu), elr);
456 }
457
458 #endif /* __ARM64_KVM_EMULATE_H__ */