Commit | Line | Data |
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d809aa23 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a3508fbe DH |
2 | /* |
3 | * kvm nested virtualization support for s390x | |
4 | * | |
a3da7b4a | 5 | * Copyright IBM Corp. 2016, 2018 |
a3508fbe | 6 | * |
a3508fbe DH |
7 | * Author(s): David Hildenbrand <dahi@linux.vnet.ibm.com> |
8 | */ | |
9 | #include <linux/vmalloc.h> | |
10 | #include <linux/kvm_host.h> | |
11 | #include <linux/bug.h> | |
12 | #include <linux/list.h> | |
13 | #include <linux/bitmap.h> | |
174cd4b1 IM |
14 | #include <linux/sched/signal.h> |
15 | ||
a3508fbe DH |
16 | #include <asm/gmap.h> |
17 | #include <asm/mmu_context.h> | |
18 | #include <asm/sclp.h> | |
19 | #include <asm/nmi.h> | |
66b630d5 | 20 | #include <asm/dis.h> |
a3508fbe DH |
21 | #include "kvm-s390.h" |
22 | #include "gaccess.h" | |
23 | ||
24 | struct vsie_page { | |
25 | struct kvm_s390_sie_block scb_s; /* 0x0000 */ | |
d52cd207 QH |
26 | /* |
27 | * the backup info for machine check. ensure it's at | |
28 | * the same offset as that in struct sie_page! | |
29 | */ | |
30 | struct mcck_volatile_info mcck_info; /* 0x0200 */ | |
b3ecd4aa DH |
31 | /* |
32 | * The pinned original scb. Be aware that other VCPUs can modify | |
33 | * it while we read from it. Values that are used for conditions or | |
34 | * are reused conditionally, should be accessed via READ_ONCE. | |
35 | */ | |
d52cd207 | 36 | struct kvm_s390_sie_block *scb_o; /* 0x0218 */ |
a3508fbe | 37 | /* the shadow gmap in use by the vsie_page */ |
d52cd207 | 38 | struct gmap *gmap; /* 0x0220 */ |
1b7029be | 39 | /* address of the last reported fault to guest2 */ |
d52cd207 | 40 | unsigned long fault_addr; /* 0x0228 */ |
15e5020e DH |
41 | /* calculated guest addresses of satellite control blocks */ |
42 | gpa_t sca_gpa; /* 0x0230 */ | |
43 | gpa_t itdba_gpa; /* 0x0238 */ | |
44 | gpa_t gvrd_gpa; /* 0x0240 */ | |
45 | gpa_t riccbd_gpa; /* 0x0248 */ | |
46 | gpa_t sdnx_gpa; /* 0x0250 */ | |
47 | __u8 reserved[0x0700 - 0x0258]; /* 0x0258 */ | |
bbeaa58b | 48 | struct kvm_s390_crypto_cb crycb; /* 0x0700 */ |
66b630d5 | 49 | __u8 fac[S390_ARCH_FAC_LIST_SIZE_BYTE]; /* 0x0800 */ |
1cae0255 | 50 | }; |
a3508fbe DH |
51 | |
52 | /* trigger a validity icpt for the given scb */ | |
53 | static int set_validity_icpt(struct kvm_s390_sie_block *scb, | |
54 | __u16 reason_code) | |
55 | { | |
56 | scb->ipa = 0x1000; | |
57 | scb->ipb = ((__u32) reason_code) << 16; | |
58 | scb->icptcode = ICPT_VALIDITY; | |
59 | return 1; | |
60 | } | |
61 | ||
62 | /* mark the prefix as unmapped, this will block the VSIE */ | |
63 | static void prefix_unmapped(struct vsie_page *vsie_page) | |
64 | { | |
65 | atomic_or(PROG_REQUEST, &vsie_page->scb_s.prog20); | |
66 | } | |
67 | ||
68 | /* mark the prefix as unmapped and wait until the VSIE has been left */ | |
69 | static void prefix_unmapped_sync(struct vsie_page *vsie_page) | |
70 | { | |
71 | prefix_unmapped(vsie_page); | |
72 | if (vsie_page->scb_s.prog0c & PROG_IN_SIE) | |
73 | atomic_or(CPUSTAT_STOP_INT, &vsie_page->scb_s.cpuflags); | |
74 | while (vsie_page->scb_s.prog0c & PROG_IN_SIE) | |
75 | cpu_relax(); | |
76 | } | |
77 | ||
78 | /* mark the prefix as mapped, this will allow the VSIE to run */ | |
79 | static void prefix_mapped(struct vsie_page *vsie_page) | |
80 | { | |
81 | atomic_andnot(PROG_REQUEST, &vsie_page->scb_s.prog20); | |
82 | } | |
83 | ||
06d68a6c DH |
84 | /* test if the prefix is mapped into the gmap shadow */ |
85 | static int prefix_is_mapped(struct vsie_page *vsie_page) | |
86 | { | |
87 | return !(atomic_read(&vsie_page->scb_s.prog20) & PROG_REQUEST); | |
88 | } | |
a3508fbe DH |
89 | |
90 | /* copy the updated intervention request bits into the shadow scb */ | |
91 | static void update_intervention_requests(struct vsie_page *vsie_page) | |
92 | { | |
93 | const int bits = CPUSTAT_STOP_INT | CPUSTAT_IO_INT | CPUSTAT_EXT_INT; | |
94 | int cpuflags; | |
95 | ||
96 | cpuflags = atomic_read(&vsie_page->scb_o->cpuflags); | |
97 | atomic_andnot(bits, &vsie_page->scb_s.cpuflags); | |
98 | atomic_or(cpuflags & bits, &vsie_page->scb_s.cpuflags); | |
99 | } | |
100 | ||
101 | /* shadow (filter and validate) the cpuflags */ | |
102 | static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
103 | { | |
104 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
105 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
106 | int newflags, cpuflags = atomic_read(&scb_o->cpuflags); | |
107 | ||
108 | /* we don't allow ESA/390 guests */ | |
109 | if (!(cpuflags & CPUSTAT_ZARCH)) | |
110 | return set_validity_icpt(scb_s, 0x0001U); | |
111 | ||
112 | if (cpuflags & (CPUSTAT_RRF | CPUSTAT_MCDS)) | |
113 | return set_validity_icpt(scb_s, 0x0001U); | |
114 | else if (cpuflags & (CPUSTAT_SLSV | CPUSTAT_SLSR)) | |
115 | return set_validity_icpt(scb_s, 0x0007U); | |
116 | ||
117 | /* intervention requests will be set later */ | |
118 | newflags = CPUSTAT_ZARCH; | |
535ef81c DH |
119 | if (cpuflags & CPUSTAT_GED && test_kvm_facility(vcpu->kvm, 8)) |
120 | newflags |= CPUSTAT_GED; | |
121 | if (cpuflags & CPUSTAT_GED2 && test_kvm_facility(vcpu->kvm, 78)) { | |
122 | if (cpuflags & CPUSTAT_GED) | |
123 | return set_validity_icpt(scb_s, 0x0001U); | |
124 | newflags |= CPUSTAT_GED2; | |
125 | } | |
77d18f6d DH |
126 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GPERE)) |
127 | newflags |= cpuflags & CPUSTAT_P; | |
a1b7b9b2 DH |
128 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GSLS)) |
129 | newflags |= cpuflags & CPUSTAT_SM; | |
7fd7f39d DH |
130 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IBS)) |
131 | newflags |= cpuflags & CPUSTAT_IBS; | |
730cd632 FA |
132 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_KSS)) |
133 | newflags |= cpuflags & CPUSTAT_KSS; | |
a3508fbe DH |
134 | |
135 | atomic_set(&scb_s->cpuflags, newflags); | |
136 | return 0; | |
137 | } | |
6b79de4b PM |
138 | /* Copy to APCB FORMAT1 from APCB FORMAT0 */ |
139 | static int setup_apcb10(struct kvm_vcpu *vcpu, struct kvm_s390_apcb1 *apcb_s, | |
140 | unsigned long apcb_o, struct kvm_s390_apcb1 *apcb_h) | |
141 | { | |
142 | struct kvm_s390_apcb0 tmp; | |
a3508fbe | 143 | |
6b79de4b PM |
144 | if (read_guest_real(vcpu, apcb_o, &tmp, sizeof(struct kvm_s390_apcb0))) |
145 | return -EFAULT; | |
146 | ||
147 | apcb_s->apm[0] = apcb_h->apm[0] & tmp.apm[0]; | |
148 | apcb_s->aqm[0] = apcb_h->aqm[0] & tmp.aqm[0] & 0xffff000000000000UL; | |
149 | apcb_s->adm[0] = apcb_h->adm[0] & tmp.adm[0] & 0xffff000000000000UL; | |
150 | ||
151 | return 0; | |
152 | ||
153 | } | |
a3508fbe | 154 | |
6ee74098 PM |
155 | /** |
156 | * setup_apcb00 - Copy to APCB FORMAT0 from APCB FORMAT0 | |
157 | * @vcpu: pointer to the virtual CPU | |
158 | * @apcb_s: pointer to start of apcb in the shadow crycb | |
159 | * @apcb_o: pointer to start of original apcb in the guest2 | |
160 | * @apcb_h: pointer to start of apcb in the guest1 | |
161 | * | |
162 | * Returns 0 and -EFAULT on error reading guest apcb | |
163 | */ | |
19fd83a6 PM |
164 | static int setup_apcb00(struct kvm_vcpu *vcpu, unsigned long *apcb_s, |
165 | unsigned long apcb_o, unsigned long *apcb_h) | |
166 | { | |
167 | if (read_guest_real(vcpu, apcb_o, apcb_s, | |
168 | sizeof(struct kvm_s390_apcb0))) | |
169 | return -EFAULT; | |
170 | ||
171 | bitmap_and(apcb_s, apcb_s, apcb_h, sizeof(struct kvm_s390_apcb0)); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
56019f9a PM |
176 | /** |
177 | * setup_apcb11 - Copy the FORMAT1 APCB from the guest to the shadow CRYCB | |
178 | * @vcpu: pointer to the virtual CPU | |
179 | * @apcb_s: pointer to start of apcb in the shadow crycb | |
180 | * @apcb_o: pointer to start of original guest apcb | |
181 | * @apcb_h: pointer to start of apcb in the host | |
182 | * | |
183 | * Returns 0 and -EFAULT on error reading guest apcb | |
184 | */ | |
185 | static int setup_apcb11(struct kvm_vcpu *vcpu, unsigned long *apcb_s, | |
186 | unsigned long apcb_o, | |
187 | unsigned long *apcb_h) | |
188 | { | |
189 | if (read_guest_real(vcpu, apcb_o, apcb_s, | |
190 | sizeof(struct kvm_s390_apcb1))) | |
191 | return -EFAULT; | |
192 | ||
193 | bitmap_and(apcb_s, apcb_s, apcb_h, sizeof(struct kvm_s390_apcb1)); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | /** | |
199 | * setup_apcb - Create a shadow copy of the apcb. | |
200 | * @vcpu: pointer to the virtual CPU | |
201 | * @crycb_s: pointer to shadow crycb | |
202 | * @crycb_o: pointer to original guest crycb | |
203 | * @crycb_h: pointer to the host crycb | |
204 | * @fmt_o: format of the original guest crycb. | |
205 | * @fmt_h: format of the host crycb. | |
206 | * | |
207 | * Checks the compatibility between the guest and host crycb and calls the | |
208 | * appropriate copy function. | |
209 | * | |
210 | * Return 0 or an error number if the guest and host crycb are incompatible. | |
211 | */ | |
212 | static int setup_apcb(struct kvm_vcpu *vcpu, struct kvm_s390_crypto_cb *crycb_s, | |
213 | const u32 crycb_o, | |
214 | struct kvm_s390_crypto_cb *crycb_h, | |
215 | int fmt_o, int fmt_h) | |
216 | { | |
217 | struct kvm_s390_crypto_cb *crycb; | |
218 | ||
219 | crycb = (struct kvm_s390_crypto_cb *) (unsigned long)crycb_o; | |
220 | ||
221 | switch (fmt_o) { | |
222 | case CRYCB_FORMAT2: | |
223 | if ((crycb_o & PAGE_MASK) != ((crycb_o + 256) & PAGE_MASK)) | |
224 | return -EACCES; | |
225 | if (fmt_h != CRYCB_FORMAT2) | |
226 | return -EINVAL; | |
227 | return setup_apcb11(vcpu, (unsigned long *)&crycb_s->apcb1, | |
228 | (unsigned long) &crycb->apcb1, | |
229 | (unsigned long *)&crycb_h->apcb1); | |
19fd83a6 | 230 | case CRYCB_FORMAT1: |
6b79de4b PM |
231 | switch (fmt_h) { |
232 | case CRYCB_FORMAT2: | |
233 | return setup_apcb10(vcpu, &crycb_s->apcb1, | |
234 | (unsigned long) &crycb->apcb0, | |
235 | &crycb_h->apcb1); | |
236 | case CRYCB_FORMAT1: | |
237 | return setup_apcb00(vcpu, | |
238 | (unsigned long *) &crycb_s->apcb0, | |
239 | (unsigned long) &crycb->apcb0, | |
240 | (unsigned long *) &crycb_h->apcb0); | |
241 | } | |
242 | break; | |
6ee74098 PM |
243 | case CRYCB_FORMAT0: |
244 | if ((crycb_o & PAGE_MASK) != ((crycb_o + 32) & PAGE_MASK)) | |
245 | return -EACCES; | |
c9ba8c2c PM |
246 | |
247 | switch (fmt_h) { | |
248 | case CRYCB_FORMAT2: | |
9ee71f20 PM |
249 | return setup_apcb10(vcpu, &crycb_s->apcb1, |
250 | (unsigned long) &crycb->apcb0, | |
251 | &crycb_h->apcb1); | |
c9ba8c2c PM |
252 | case CRYCB_FORMAT1: |
253 | case CRYCB_FORMAT0: | |
254 | return setup_apcb00(vcpu, | |
255 | (unsigned long *) &crycb_s->apcb0, | |
256 | (unsigned long) &crycb->apcb0, | |
257 | (unsigned long *) &crycb_h->apcb0); | |
258 | } | |
56019f9a PM |
259 | } |
260 | return -EINVAL; | |
261 | } | |
262 | ||
263 | /** | |
264 | * shadow_crycb - Create a shadow copy of the crycb block | |
265 | * @vcpu: a pointer to the virtual CPU | |
266 | * @vsie_page: a pointer to internal date used for the vSIE | |
267 | * | |
bbeaa58b DH |
268 | * Create a shadow copy of the crycb block and setup key wrapping, if |
269 | * requested for guest 3 and enabled for guest 2. | |
270 | * | |
56019f9a PM |
271 | * We accept format-1 or format-2, but we convert format-1 into format-2 |
272 | * in the shadow CRYCB. | |
273 | * Using format-2 enables the firmware to choose the right format when | |
274 | * scheduling the SIE. | |
bbeaa58b DH |
275 | * There is nothing to do for format-0. |
276 | * | |
56019f9a PM |
277 | * This function centralize the issuing of set_validity_icpt() for all |
278 | * the subfunctions working on the crycb. | |
279 | * | |
bbeaa58b DH |
280 | * Returns: - 0 if shadowed or nothing to do |
281 | * - > 0 if control has to be given to guest 2 | |
282 | */ | |
283 | static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
284 | { | |
285 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
286 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
b3ecd4aa DH |
287 | const uint32_t crycbd_o = READ_ONCE(scb_o->crycbd); |
288 | const u32 crycb_addr = crycbd_o & 0x7ffffff8U; | |
bbeaa58b DH |
289 | unsigned long *b1, *b2; |
290 | u8 ecb3_flags; | |
8ec2fa52 | 291 | u32 ecd_flags; |
56019f9a | 292 | int apie_h; |
bcccb8f6 | 293 | int apie_s; |
56019f9a PM |
294 | int key_msk = test_kvm_facility(vcpu->kvm, 76); |
295 | int fmt_o = crycbd_o & CRYCB_FORMAT_MASK; | |
296 | int fmt_h = vcpu->arch.sie_block->crycbd & CRYCB_FORMAT_MASK; | |
297 | int ret = 0; | |
bbeaa58b DH |
298 | |
299 | scb_s->crycbd = 0; | |
56019f9a PM |
300 | |
301 | apie_h = vcpu->arch.sie_block->eca & ECA_APIE; | |
bcccb8f6 PM |
302 | apie_s = apie_h & scb_o->eca; |
303 | if (!apie_s && (!key_msk || (fmt_o == CRYCB_FORMAT0))) | |
bbeaa58b | 304 | return 0; |
bbeaa58b | 305 | |
56019f9a | 306 | if (!crycb_addr) |
bbeaa58b DH |
307 | return set_validity_icpt(scb_s, 0x0039U); |
308 | ||
56019f9a PM |
309 | if (fmt_o == CRYCB_FORMAT1) |
310 | if ((crycb_addr & PAGE_MASK) != | |
311 | ((crycb_addr + 128) & PAGE_MASK)) | |
312 | return set_validity_icpt(scb_s, 0x003CU); | |
313 | ||
bcccb8f6 | 314 | if (apie_s) { |
56019f9a PM |
315 | ret = setup_apcb(vcpu, &vsie_page->crycb, crycb_addr, |
316 | vcpu->kvm->arch.crypto.crycb, | |
317 | fmt_o, fmt_h); | |
318 | if (ret) | |
319 | goto end; | |
320 | scb_s->eca |= scb_o->eca & ECA_APIE; | |
321 | } | |
322 | ||
bbeaa58b DH |
323 | /* we may only allow it if enabled for guest 2 */ |
324 | ecb3_flags = scb_o->ecb3 & vcpu->arch.sie_block->ecb3 & | |
325 | (ECB3_AES | ECB3_DEA); | |
8ec2fa52 CB |
326 | ecd_flags = scb_o->ecd & vcpu->arch.sie_block->ecd & ECD_ECC; |
327 | if (!ecb3_flags && !ecd_flags) | |
56019f9a | 328 | goto end; |
bbeaa58b DH |
329 | |
330 | /* copy only the wrapping keys */ | |
204c9724 PM |
331 | if (read_guest_real(vcpu, crycb_addr + 72, |
332 | vsie_page->crycb.dea_wrapping_key_mask, 56)) | |
bbeaa58b DH |
333 | return set_validity_icpt(scb_s, 0x0035U); |
334 | ||
335 | scb_s->ecb3 |= ecb3_flags; | |
8ec2fa52 | 336 | scb_s->ecd |= ecd_flags; |
bbeaa58b DH |
337 | |
338 | /* xor both blocks in one run */ | |
339 | b1 = (unsigned long *) vsie_page->crycb.dea_wrapping_key_mask; | |
340 | b2 = (unsigned long *) | |
341 | vcpu->kvm->arch.crypto.crycb->dea_wrapping_key_mask; | |
342 | /* as 56%8 == 0, bitmap_xor won't overwrite any data */ | |
343 | bitmap_xor(b1, b1, b2, BITS_PER_BYTE * 56); | |
56019f9a PM |
344 | end: |
345 | switch (ret) { | |
346 | case -EINVAL: | |
b2d0371d | 347 | return set_validity_icpt(scb_s, 0x0022U); |
56019f9a PM |
348 | case -EFAULT: |
349 | return set_validity_icpt(scb_s, 0x0035U); | |
350 | case -EACCES: | |
351 | return set_validity_icpt(scb_s, 0x003CU); | |
352 | } | |
353 | scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | CRYCB_FORMAT2; | |
bbeaa58b DH |
354 | return 0; |
355 | } | |
356 | ||
3573602b DH |
357 | /* shadow (round up/down) the ibc to avoid validity icpt */ |
358 | static void prepare_ibc(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
359 | { | |
360 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
361 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
b3ecd4aa DH |
362 | /* READ_ONCE does not work on bitfields - use a temporary variable */ |
363 | const uint32_t __new_ibc = scb_o->ibc; | |
364 | const uint32_t new_ibc = READ_ONCE(__new_ibc) & 0x0fffU; | |
3573602b DH |
365 | __u64 min_ibc = (sclp.ibc >> 16) & 0x0fffU; |
366 | ||
367 | scb_s->ibc = 0; | |
368 | /* ibc installed in g2 and requested for g3 */ | |
b3ecd4aa DH |
369 | if (vcpu->kvm->arch.model.ibc && new_ibc) { |
370 | scb_s->ibc = new_ibc; | |
3573602b DH |
371 | /* takte care of the minimum ibc level of the machine */ |
372 | if (scb_s->ibc < min_ibc) | |
373 | scb_s->ibc = min_ibc; | |
374 | /* take care of the maximum ibc level set for the guest */ | |
375 | if (scb_s->ibc > vcpu->kvm->arch.model.ibc) | |
376 | scb_s->ibc = vcpu->kvm->arch.model.ibc; | |
377 | } | |
378 | } | |
379 | ||
a3508fbe DH |
380 | /* unshadow the scb, copying parameters back to the real scb */ |
381 | static void unshadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
382 | { | |
383 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
384 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
385 | ||
386 | /* interception */ | |
387 | scb_o->icptcode = scb_s->icptcode; | |
388 | scb_o->icptstatus = scb_s->icptstatus; | |
389 | scb_o->ipa = scb_s->ipa; | |
390 | scb_o->ipb = scb_s->ipb; | |
391 | scb_o->gbea = scb_s->gbea; | |
392 | ||
393 | /* timer */ | |
394 | scb_o->cputm = scb_s->cputm; | |
395 | scb_o->ckc = scb_s->ckc; | |
396 | scb_o->todpr = scb_s->todpr; | |
397 | ||
398 | /* guest state */ | |
399 | scb_o->gpsw = scb_s->gpsw; | |
400 | scb_o->gg14 = scb_s->gg14; | |
401 | scb_o->gg15 = scb_s->gg15; | |
402 | memcpy(scb_o->gcr, scb_s->gcr, 128); | |
403 | scb_o->pp = scb_s->pp; | |
404 | ||
35b3fde6 CB |
405 | /* branch prediction */ |
406 | if (test_kvm_facility(vcpu->kvm, 82)) { | |
407 | scb_o->fpf &= ~FPF_BPBC; | |
408 | scb_o->fpf |= scb_s->fpf & FPF_BPBC; | |
409 | } | |
410 | ||
a3508fbe DH |
411 | /* interrupt intercept */ |
412 | switch (scb_s->icptcode) { | |
413 | case ICPT_PROGI: | |
414 | case ICPT_INSTPROGI: | |
415 | case ICPT_EXTINT: | |
416 | memcpy((void *)((u64)scb_o + 0xc0), | |
417 | (void *)((u64)scb_s + 0xc0), 0xf0 - 0xc0); | |
418 | break; | |
419 | case ICPT_PARTEXEC: | |
420 | /* MVPG only */ | |
421 | memcpy((void *)((u64)scb_o + 0xc0), | |
422 | (void *)((u64)scb_s + 0xc0), 0xd0 - 0xc0); | |
423 | break; | |
424 | } | |
425 | ||
426 | if (scb_s->ihcpu != 0xffffU) | |
427 | scb_o->ihcpu = scb_s->ihcpu; | |
428 | } | |
429 | ||
430 | /* | |
431 | * Setup the shadow scb by copying and checking the relevant parts of the g2 | |
432 | * provided scb. | |
433 | * | |
434 | * Returns: - 0 if the scb has been shadowed | |
435 | * - > 0 if control has to be given to guest 2 | |
436 | */ | |
437 | static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
438 | { | |
439 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
440 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
b3ecd4aa DH |
441 | /* READ_ONCE does not work on bitfields - use a temporary variable */ |
442 | const uint32_t __new_prefix = scb_o->prefix; | |
443 | const uint32_t new_prefix = READ_ONCE(__new_prefix); | |
444 | const bool wants_tx = READ_ONCE(scb_o->ecb) & ECB_TE; | |
0c9d8683 | 445 | bool had_tx = scb_s->ecb & ECB_TE; |
a1b7b9b2 | 446 | unsigned long new_mso = 0; |
a3508fbe DH |
447 | int rc; |
448 | ||
449 | /* make sure we don't have any leftovers when reusing the scb */ | |
450 | scb_s->icptcode = 0; | |
451 | scb_s->eca = 0; | |
452 | scb_s->ecb = 0; | |
453 | scb_s->ecb2 = 0; | |
454 | scb_s->ecb3 = 0; | |
455 | scb_s->ecd = 0; | |
66b630d5 | 456 | scb_s->fac = 0; |
35b3fde6 | 457 | scb_s->fpf = 0; |
a3508fbe DH |
458 | |
459 | rc = prepare_cpuflags(vcpu, vsie_page); | |
460 | if (rc) | |
461 | goto out; | |
462 | ||
463 | /* timer */ | |
464 | scb_s->cputm = scb_o->cputm; | |
465 | scb_s->ckc = scb_o->ckc; | |
466 | scb_s->todpr = scb_o->todpr; | |
467 | scb_s->epoch = scb_o->epoch; | |
468 | ||
469 | /* guest state */ | |
470 | scb_s->gpsw = scb_o->gpsw; | |
471 | scb_s->gg14 = scb_o->gg14; | |
472 | scb_s->gg15 = scb_o->gg15; | |
473 | memcpy(scb_s->gcr, scb_o->gcr, 128); | |
474 | scb_s->pp = scb_o->pp; | |
475 | ||
476 | /* interception / execution handling */ | |
477 | scb_s->gbea = scb_o->gbea; | |
478 | scb_s->lctl = scb_o->lctl; | |
479 | scb_s->svcc = scb_o->svcc; | |
480 | scb_s->ictl = scb_o->ictl; | |
481 | /* | |
482 | * SKEY handling functions can't deal with false setting of PTE invalid | |
483 | * bits. Therefore we cannot provide interpretation and would later | |
484 | * have to provide own emulation handlers. | |
485 | */ | |
730cd632 FA |
486 | if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_KSS)) |
487 | scb_s->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; | |
488 | ||
a3508fbe DH |
489 | scb_s->icpua = scb_o->icpua; |
490 | ||
a1b7b9b2 | 491 | if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_SM)) |
b3ecd4aa | 492 | new_mso = READ_ONCE(scb_o->mso) & 0xfffffffffff00000UL; |
06d68a6c | 493 | /* if the hva of the prefix changes, we have to remap the prefix */ |
b3ecd4aa | 494 | if (scb_s->mso != new_mso || scb_s->prefix != new_prefix) |
06d68a6c | 495 | prefix_unmapped(vsie_page); |
a3508fbe DH |
496 | /* SIE will do mso/msl validity and exception checks for us */ |
497 | scb_s->msl = scb_o->msl & 0xfffffffffff00000UL; | |
06d68a6c | 498 | scb_s->mso = new_mso; |
b3ecd4aa | 499 | scb_s->prefix = new_prefix; |
a3508fbe DH |
500 | |
501 | /* We have to definetly flush the tlb if this scb never ran */ | |
502 | if (scb_s->ihcpu != 0xffffU) | |
503 | scb_s->ihcpu = scb_o->ihcpu; | |
504 | ||
505 | /* MVPG and Protection Exception Interpretation are always available */ | |
0c9d8683 | 506 | scb_s->eca |= scb_o->eca & (ECA_MVPGI | ECA_PROTEXCI); |
4ceafa90 DH |
507 | /* Host-protection-interruption introduced with ESOP */ |
508 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_ESOP)) | |
0c9d8683 | 509 | scb_s->ecb |= scb_o->ecb & ECB_HOSTPROTINT; |
166ecb3d | 510 | /* transactional execution */ |
b3ecd4aa | 511 | if (test_kvm_facility(vcpu->kvm, 73) && wants_tx) { |
166ecb3d | 512 | /* remap the prefix is tx is toggled on */ |
b3ecd4aa | 513 | if (!had_tx) |
166ecb3d | 514 | prefix_unmapped(vsie_page); |
b3ecd4aa | 515 | scb_s->ecb |= ECB_TE; |
166ecb3d | 516 | } |
35b3fde6 CB |
517 | /* branch prediction */ |
518 | if (test_kvm_facility(vcpu->kvm, 82)) | |
519 | scb_s->fpf |= scb_o->fpf & FPF_BPBC; | |
c9bc1eab DH |
520 | /* SIMD */ |
521 | if (test_kvm_facility(vcpu->kvm, 129)) { | |
0c9d8683 DH |
522 | scb_s->eca |= scb_o->eca & ECA_VX; |
523 | scb_s->ecd |= scb_o->ecd & ECD_HOSTREGMGMT; | |
c9bc1eab | 524 | } |
588438cb DH |
525 | /* Run-time-Instrumentation */ |
526 | if (test_kvm_facility(vcpu->kvm, 64)) | |
0c9d8683 | 527 | scb_s->ecb3 |= scb_o->ecb3 & ECB3_RI; |
cd1836f5 JF |
528 | /* Instruction Execution Prevention */ |
529 | if (test_kvm_facility(vcpu->kvm, 130)) | |
0c9d8683 | 530 | scb_s->ecb2 |= scb_o->ecb2 & ECB2_IEP; |
4e0b1ab7 FZ |
531 | /* Guarded Storage */ |
532 | if (test_kvm_facility(vcpu->kvm, 133)) { | |
533 | scb_s->ecb |= scb_o->ecb & ECB_GS; | |
534 | scb_s->ecd |= scb_o->ecd & ECD_HOSTREGMGMT; | |
535 | } | |
0615a326 | 536 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIIF)) |
0c9d8683 | 537 | scb_s->eca |= scb_o->eca & ECA_SII; |
5630a8e8 | 538 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IB)) |
0c9d8683 | 539 | scb_s->eca |= scb_o->eca & ECA_IB; |
13ee3f67 | 540 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_CEI)) |
0c9d8683 | 541 | scb_s->eca |= scb_o->eca & ECA_CEI; |
8fa1696e CW |
542 | /* Epoch Extension */ |
543 | if (test_kvm_facility(vcpu->kvm, 139)) | |
544 | scb_s->ecd |= scb_o->ecd & ECD_MEF; | |
a3508fbe | 545 | |
a3da7b4a CB |
546 | /* etoken */ |
547 | if (test_kvm_facility(vcpu->kvm, 156)) | |
548 | scb_s->ecd |= scb_o->ecd & ECD_ETOKENF; | |
549 | ||
67d49d52 CW |
550 | scb_s->hpid = HPID_VSIE; |
551 | ||
3573602b | 552 | prepare_ibc(vcpu, vsie_page); |
bbeaa58b | 553 | rc = shadow_crycb(vcpu, vsie_page); |
a3508fbe DH |
554 | out: |
555 | if (rc) | |
556 | unshadow_scb(vcpu, vsie_page); | |
557 | return rc; | |
558 | } | |
559 | ||
560 | void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start, | |
561 | unsigned long end) | |
562 | { | |
563 | struct kvm *kvm = gmap->private; | |
564 | struct vsie_page *cur; | |
565 | unsigned long prefix; | |
566 | struct page *page; | |
567 | int i; | |
568 | ||
569 | if (!gmap_is_shadow(gmap)) | |
570 | return; | |
571 | if (start >= 1UL << 31) | |
572 | /* We are only interested in prefix pages */ | |
573 | return; | |
574 | ||
575 | /* | |
576 | * Only new shadow blocks are added to the list during runtime, | |
577 | * therefore we can safely reference them all the time. | |
578 | */ | |
579 | for (i = 0; i < kvm->arch.vsie.page_count; i++) { | |
580 | page = READ_ONCE(kvm->arch.vsie.pages[i]); | |
581 | if (!page) | |
582 | continue; | |
583 | cur = page_to_virt(page); | |
584 | if (READ_ONCE(cur->gmap) != gmap) | |
585 | continue; | |
586 | prefix = cur->scb_s.prefix << GUEST_PREFIX_SHIFT; | |
587 | /* with mso/msl, the prefix lies at an offset */ | |
588 | prefix += cur->scb_s.mso; | |
166ecb3d | 589 | if (prefix <= end && start <= prefix + 2 * PAGE_SIZE - 1) |
a3508fbe DH |
590 | prefix_unmapped_sync(cur); |
591 | } | |
592 | } | |
593 | ||
594 | /* | |
166ecb3d | 595 | * Map the first prefix page and if tx is enabled also the second prefix page. |
a3508fbe DH |
596 | * |
597 | * The prefix will be protected, a gmap notifier will inform about unmaps. | |
598 | * The shadow scb must not be executed until the prefix is remapped, this is | |
599 | * guaranteed by properly handling PROG_REQUEST. | |
600 | * | |
601 | * Returns: - 0 on if successfully mapped or already mapped | |
602 | * - > 0 if control has to be given to guest 2 | |
603 | * - -EAGAIN if the caller can retry immediately | |
604 | * - -ENOMEM if out of memory | |
605 | */ | |
606 | static int map_prefix(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
607 | { | |
608 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
609 | u64 prefix = scb_s->prefix << GUEST_PREFIX_SHIFT; | |
610 | int rc; | |
611 | ||
06d68a6c DH |
612 | if (prefix_is_mapped(vsie_page)) |
613 | return 0; | |
614 | ||
a3508fbe DH |
615 | /* mark it as mapped so we can catch any concurrent unmappers */ |
616 | prefix_mapped(vsie_page); | |
617 | ||
618 | /* with mso/msl, the prefix lies at offset *mso* */ | |
619 | prefix += scb_s->mso; | |
620 | ||
621 | rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, prefix); | |
0c9d8683 | 622 | if (!rc && (scb_s->ecb & ECB_TE)) |
166ecb3d DH |
623 | rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, |
624 | prefix + PAGE_SIZE); | |
a3508fbe DH |
625 | /* |
626 | * We don't have to mprotect, we will be called for all unshadows. | |
627 | * SIE will detect if protection applies and trigger a validity. | |
628 | */ | |
629 | if (rc) | |
630 | prefix_unmapped(vsie_page); | |
631 | if (rc > 0 || rc == -EFAULT) | |
632 | rc = set_validity_icpt(scb_s, 0x0037U); | |
633 | return rc; | |
634 | } | |
635 | ||
636 | /* | |
637 | * Pin the guest page given by gpa and set hpa to the pinned host address. | |
638 | * Will always be pinned writable. | |
639 | * | |
640 | * Returns: - 0 on success | |
641 | * - -EINVAL if the gpa is not valid guest storage | |
a3508fbe DH |
642 | */ |
643 | static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa) | |
644 | { | |
645 | struct page *page; | |
a3508fbe | 646 | |
f7a6509f DH |
647 | page = gfn_to_page(kvm, gpa_to_gfn(gpa)); |
648 | if (is_error_page(page)) | |
a3508fbe | 649 | return -EINVAL; |
a3508fbe DH |
650 | *hpa = (hpa_t) page_to_virt(page) + (gpa & ~PAGE_MASK); |
651 | return 0; | |
652 | } | |
653 | ||
654 | /* Unpins a page previously pinned via pin_guest_page, marking it as dirty. */ | |
655 | static void unpin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t hpa) | |
656 | { | |
f7a6509f | 657 | kvm_release_pfn_dirty(hpa >> PAGE_SHIFT); |
a3508fbe DH |
658 | /* mark the page always as dirty for migration */ |
659 | mark_page_dirty(kvm, gpa_to_gfn(gpa)); | |
660 | } | |
661 | ||
662 | /* unpin all blocks previously pinned by pin_blocks(), marking them dirty */ | |
663 | static void unpin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
664 | { | |
a3508fbe DH |
665 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; |
666 | hpa_t hpa; | |
a3508fbe DH |
667 | |
668 | hpa = (u64) scb_s->scaoh << 32 | scb_s->scaol; | |
669 | if (hpa) { | |
15e5020e DH |
670 | unpin_guest_page(vcpu->kvm, vsie_page->sca_gpa, hpa); |
671 | vsie_page->sca_gpa = 0; | |
a3508fbe DH |
672 | scb_s->scaol = 0; |
673 | scb_s->scaoh = 0; | |
674 | } | |
166ecb3d DH |
675 | |
676 | hpa = scb_s->itdba; | |
677 | if (hpa) { | |
15e5020e DH |
678 | unpin_guest_page(vcpu->kvm, vsie_page->itdba_gpa, hpa); |
679 | vsie_page->itdba_gpa = 0; | |
166ecb3d DH |
680 | scb_s->itdba = 0; |
681 | } | |
c9bc1eab DH |
682 | |
683 | hpa = scb_s->gvrd; | |
684 | if (hpa) { | |
15e5020e DH |
685 | unpin_guest_page(vcpu->kvm, vsie_page->gvrd_gpa, hpa); |
686 | vsie_page->gvrd_gpa = 0; | |
c9bc1eab DH |
687 | scb_s->gvrd = 0; |
688 | } | |
588438cb DH |
689 | |
690 | hpa = scb_s->riccbd; | |
691 | if (hpa) { | |
15e5020e DH |
692 | unpin_guest_page(vcpu->kvm, vsie_page->riccbd_gpa, hpa); |
693 | vsie_page->riccbd_gpa = 0; | |
588438cb DH |
694 | scb_s->riccbd = 0; |
695 | } | |
4e0b1ab7 FZ |
696 | |
697 | hpa = scb_s->sdnxo; | |
698 | if (hpa) { | |
15e5020e DH |
699 | unpin_guest_page(vcpu->kvm, vsie_page->sdnx_gpa, hpa); |
700 | vsie_page->sdnx_gpa = 0; | |
4e0b1ab7 FZ |
701 | scb_s->sdnxo = 0; |
702 | } | |
a3508fbe DH |
703 | } |
704 | ||
705 | /* | |
706 | * Instead of shadowing some blocks, we can simply forward them because the | |
707 | * addresses in the scb are 64 bit long. | |
708 | * | |
709 | * This works as long as the data lies in one page. If blocks ever exceed one | |
710 | * page, we have to fall back to shadowing. | |
711 | * | |
712 | * As we reuse the sca, the vcpu pointers contained in it are invalid. We must | |
713 | * therefore not enable any facilities that access these pointers (e.g. SIGPIF). | |
714 | * | |
715 | * Returns: - 0 if all blocks were pinned. | |
716 | * - > 0 if control has to be given to guest 2 | |
717 | * - -ENOMEM if out of memory | |
718 | */ | |
719 | static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
720 | { | |
721 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
722 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
723 | hpa_t hpa; | |
724 | gpa_t gpa; | |
725 | int rc = 0; | |
726 | ||
b3ecd4aa | 727 | gpa = READ_ONCE(scb_o->scaol) & ~0xfUL; |
19c439b5 | 728 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO)) |
b3ecd4aa | 729 | gpa |= (u64) READ_ONCE(scb_o->scaoh) << 32; |
a3508fbe | 730 | if (gpa) { |
2c8180e8 | 731 | if (gpa < 2 * PAGE_SIZE) |
a3508fbe DH |
732 | rc = set_validity_icpt(scb_s, 0x0038U); |
733 | else if ((gpa & ~0x1fffUL) == kvm_s390_get_prefix(vcpu)) | |
734 | rc = set_validity_icpt(scb_s, 0x0011U); | |
735 | else if ((gpa & PAGE_MASK) != | |
736 | ((gpa + sizeof(struct bsca_block) - 1) & PAGE_MASK)) | |
737 | rc = set_validity_icpt(scb_s, 0x003bU); | |
738 | if (!rc) { | |
739 | rc = pin_guest_page(vcpu->kvm, gpa, &hpa); | |
f7a6509f | 740 | if (rc) |
a3508fbe DH |
741 | rc = set_validity_icpt(scb_s, 0x0034U); |
742 | } | |
743 | if (rc) | |
744 | goto unpin; | |
15e5020e | 745 | vsie_page->sca_gpa = gpa; |
a3508fbe DH |
746 | scb_s->scaoh = (u32)((u64)hpa >> 32); |
747 | scb_s->scaol = (u32)(u64)hpa; | |
748 | } | |
166ecb3d | 749 | |
b3ecd4aa | 750 | gpa = READ_ONCE(scb_o->itdba) & ~0xffUL; |
0c9d8683 | 751 | if (gpa && (scb_s->ecb & ECB_TE)) { |
2c8180e8 | 752 | if (gpa < 2 * PAGE_SIZE) { |
166ecb3d DH |
753 | rc = set_validity_icpt(scb_s, 0x0080U); |
754 | goto unpin; | |
755 | } | |
756 | /* 256 bytes cannot cross page boundaries */ | |
757 | rc = pin_guest_page(vcpu->kvm, gpa, &hpa); | |
f7a6509f | 758 | if (rc) { |
166ecb3d | 759 | rc = set_validity_icpt(scb_s, 0x0080U); |
166ecb3d | 760 | goto unpin; |
f7a6509f | 761 | } |
15e5020e | 762 | vsie_page->itdba_gpa = gpa; |
166ecb3d DH |
763 | scb_s->itdba = hpa; |
764 | } | |
c9bc1eab | 765 | |
b3ecd4aa | 766 | gpa = READ_ONCE(scb_o->gvrd) & ~0x1ffUL; |
0c9d8683 | 767 | if (gpa && (scb_s->eca & ECA_VX) && !(scb_s->ecd & ECD_HOSTREGMGMT)) { |
2c8180e8 | 768 | if (gpa < 2 * PAGE_SIZE) { |
c9bc1eab DH |
769 | rc = set_validity_icpt(scb_s, 0x1310U); |
770 | goto unpin; | |
771 | } | |
772 | /* | |
773 | * 512 bytes vector registers cannot cross page boundaries | |
774 | * if this block gets bigger, we have to shadow it. | |
775 | */ | |
776 | rc = pin_guest_page(vcpu->kvm, gpa, &hpa); | |
f7a6509f | 777 | if (rc) { |
c9bc1eab | 778 | rc = set_validity_icpt(scb_s, 0x1310U); |
c9bc1eab | 779 | goto unpin; |
f7a6509f | 780 | } |
15e5020e | 781 | vsie_page->gvrd_gpa = gpa; |
c9bc1eab DH |
782 | scb_s->gvrd = hpa; |
783 | } | |
588438cb | 784 | |
b3ecd4aa | 785 | gpa = READ_ONCE(scb_o->riccbd) & ~0x3fUL; |
0c9d8683 | 786 | if (gpa && (scb_s->ecb3 & ECB3_RI)) { |
2c8180e8 | 787 | if (gpa < 2 * PAGE_SIZE) { |
588438cb DH |
788 | rc = set_validity_icpt(scb_s, 0x0043U); |
789 | goto unpin; | |
790 | } | |
791 | /* 64 bytes cannot cross page boundaries */ | |
792 | rc = pin_guest_page(vcpu->kvm, gpa, &hpa); | |
f7a6509f | 793 | if (rc) { |
588438cb | 794 | rc = set_validity_icpt(scb_s, 0x0043U); |
588438cb | 795 | goto unpin; |
f7a6509f DH |
796 | } |
797 | /* Validity 0x0044 will be checked by SIE */ | |
15e5020e | 798 | vsie_page->riccbd_gpa = gpa; |
4d21cef3 | 799 | scb_s->riccbd = hpa; |
588438cb | 800 | } |
a3da7b4a CB |
801 | if (((scb_s->ecb & ECB_GS) && !(scb_s->ecd & ECD_HOSTREGMGMT)) || |
802 | (scb_s->ecd & ECD_ETOKENF)) { | |
4e0b1ab7 FZ |
803 | unsigned long sdnxc; |
804 | ||
b3ecd4aa DH |
805 | gpa = READ_ONCE(scb_o->sdnxo) & ~0xfUL; |
806 | sdnxc = READ_ONCE(scb_o->sdnxo) & 0xfUL; | |
2c8180e8 | 807 | if (!gpa || gpa < 2 * PAGE_SIZE) { |
4e0b1ab7 FZ |
808 | rc = set_validity_icpt(scb_s, 0x10b0U); |
809 | goto unpin; | |
810 | } | |
811 | if (sdnxc < 6 || sdnxc > 12) { | |
812 | rc = set_validity_icpt(scb_s, 0x10b1U); | |
813 | goto unpin; | |
814 | } | |
815 | if (gpa & ((1 << sdnxc) - 1)) { | |
816 | rc = set_validity_icpt(scb_s, 0x10b2U); | |
817 | goto unpin; | |
818 | } | |
819 | /* Due to alignment rules (checked above) this cannot | |
820 | * cross page boundaries | |
821 | */ | |
822 | rc = pin_guest_page(vcpu->kvm, gpa, &hpa); | |
f7a6509f | 823 | if (rc) { |
4e0b1ab7 | 824 | rc = set_validity_icpt(scb_s, 0x10b0U); |
4e0b1ab7 | 825 | goto unpin; |
f7a6509f | 826 | } |
15e5020e | 827 | vsie_page->sdnx_gpa = gpa; |
fe722d13 | 828 | scb_s->sdnxo = hpa | sdnxc; |
4e0b1ab7 | 829 | } |
a3508fbe DH |
830 | return 0; |
831 | unpin: | |
832 | unpin_blocks(vcpu, vsie_page); | |
833 | return rc; | |
834 | } | |
835 | ||
836 | /* unpin the scb provided by guest 2, marking it as dirty */ | |
837 | static void unpin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, | |
838 | gpa_t gpa) | |
839 | { | |
840 | hpa_t hpa = (hpa_t) vsie_page->scb_o; | |
841 | ||
842 | if (hpa) | |
843 | unpin_guest_page(vcpu->kvm, gpa, hpa); | |
844 | vsie_page->scb_o = NULL; | |
845 | } | |
846 | ||
847 | /* | |
848 | * Pin the scb at gpa provided by guest 2 at vsie_page->scb_o. | |
849 | * | |
850 | * Returns: - 0 if the scb was pinned. | |
851 | * - > 0 if control has to be given to guest 2 | |
a3508fbe DH |
852 | */ |
853 | static int pin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, | |
854 | gpa_t gpa) | |
855 | { | |
856 | hpa_t hpa; | |
857 | int rc; | |
858 | ||
859 | rc = pin_guest_page(vcpu->kvm, gpa, &hpa); | |
f7a6509f | 860 | if (rc) { |
a3508fbe | 861 | rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
f7a6509f DH |
862 | WARN_ON_ONCE(rc); |
863 | return 1; | |
a3508fbe | 864 | } |
f7a6509f DH |
865 | vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa; |
866 | return 0; | |
a3508fbe DH |
867 | } |
868 | ||
869 | /* | |
870 | * Inject a fault into guest 2. | |
871 | * | |
872 | * Returns: - > 0 if control has to be given to guest 2 | |
873 | * < 0 if an error occurred during injection. | |
874 | */ | |
875 | static int inject_fault(struct kvm_vcpu *vcpu, __u16 code, __u64 vaddr, | |
876 | bool write_flag) | |
877 | { | |
878 | struct kvm_s390_pgm_info pgm = { | |
879 | .code = code, | |
880 | .trans_exc_code = | |
881 | /* 0-51: virtual address */ | |
882 | (vaddr & 0xfffffffffffff000UL) | | |
883 | /* 52-53: store / fetch */ | |
884 | (((unsigned int) !write_flag) + 1) << 10, | |
885 | /* 62-63: asce id (alway primary == 0) */ | |
886 | .exc_access_id = 0, /* always primary */ | |
887 | .op_access_id = 0, /* not MVPG */ | |
888 | }; | |
889 | int rc; | |
890 | ||
891 | if (code == PGM_PROTECTION) | |
892 | pgm.trans_exc_code |= 0x4UL; | |
893 | ||
894 | rc = kvm_s390_inject_prog_irq(vcpu, &pgm); | |
895 | return rc ? rc : 1; | |
896 | } | |
897 | ||
898 | /* | |
899 | * Handle a fault during vsie execution on a gmap shadow. | |
900 | * | |
901 | * Returns: - 0 if the fault was resolved | |
902 | * - > 0 if control has to be given to guest 2 | |
903 | * - < 0 if an error occurred | |
904 | */ | |
905 | static int handle_fault(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
906 | { | |
907 | int rc; | |
908 | ||
909 | if (current->thread.gmap_int_code == PGM_PROTECTION) | |
910 | /* we can directly forward all protection exceptions */ | |
911 | return inject_fault(vcpu, PGM_PROTECTION, | |
912 | current->thread.gmap_addr, 1); | |
913 | ||
914 | rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, | |
915 | current->thread.gmap_addr); | |
916 | if (rc > 0) { | |
917 | rc = inject_fault(vcpu, rc, | |
918 | current->thread.gmap_addr, | |
919 | current->thread.gmap_write_flag); | |
1b7029be DH |
920 | if (rc >= 0) |
921 | vsie_page->fault_addr = current->thread.gmap_addr; | |
a3508fbe DH |
922 | } |
923 | return rc; | |
924 | } | |
925 | ||
1b7029be DH |
926 | /* |
927 | * Retry the previous fault that required guest 2 intervention. This avoids | |
928 | * one superfluous SIE re-entry and direct exit. | |
929 | * | |
930 | * Will ignore any errors. The next SIE fault will do proper fault handling. | |
931 | */ | |
932 | static void handle_last_fault(struct kvm_vcpu *vcpu, | |
933 | struct vsie_page *vsie_page) | |
934 | { | |
935 | if (vsie_page->fault_addr) | |
936 | kvm_s390_shadow_fault(vcpu, vsie_page->gmap, | |
937 | vsie_page->fault_addr); | |
938 | vsie_page->fault_addr = 0; | |
939 | } | |
940 | ||
a3508fbe DH |
941 | static inline void clear_vsie_icpt(struct vsie_page *vsie_page) |
942 | { | |
943 | vsie_page->scb_s.icptcode = 0; | |
944 | } | |
945 | ||
66b630d5 DH |
946 | /* rewind the psw and clear the vsie icpt, so we can retry execution */ |
947 | static void retry_vsie_icpt(struct vsie_page *vsie_page) | |
948 | { | |
949 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
950 | int ilen = insn_length(scb_s->ipa >> 8); | |
951 | ||
952 | /* take care of EXECUTE instructions */ | |
953 | if (scb_s->icptstatus & 1) { | |
954 | ilen = (scb_s->icptstatus >> 4) & 0x6; | |
955 | if (!ilen) | |
956 | ilen = 4; | |
957 | } | |
958 | scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, ilen); | |
959 | clear_vsie_icpt(vsie_page); | |
960 | } | |
961 | ||
962 | /* | |
963 | * Try to shadow + enable the guest 2 provided facility list. | |
964 | * Retry instruction execution if enabled for and provided by guest 2. | |
965 | * | |
966 | * Returns: - 0 if handled (retry or guest 2 icpt) | |
967 | * - > 0 if control has to be given to guest 2 | |
968 | */ | |
969 | static int handle_stfle(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
970 | { | |
971 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
b3ecd4aa | 972 | __u32 fac = READ_ONCE(vsie_page->scb_o->fac) & 0x7ffffff8U; |
66b630d5 DH |
973 | |
974 | if (fac && test_kvm_facility(vcpu->kvm, 7)) { | |
975 | retry_vsie_icpt(vsie_page); | |
976 | if (read_guest_real(vcpu, fac, &vsie_page->fac, | |
977 | sizeof(vsie_page->fac))) | |
978 | return set_validity_icpt(scb_s, 0x1090U); | |
979 | scb_s->fac = (__u32)(__u64) &vsie_page->fac; | |
980 | } | |
981 | return 0; | |
982 | } | |
983 | ||
a3508fbe DH |
984 | /* |
985 | * Run the vsie on a shadow scb and a shadow gmap, without any further | |
986 | * sanity checks, handling SIE faults. | |
987 | * | |
988 | * Returns: - 0 everything went fine | |
989 | * - > 0 if control has to be given to guest 2 | |
990 | * - < 0 if an error occurred | |
991 | */ | |
992 | static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
63747bf7 CB |
993 | __releases(vcpu->kvm->srcu) |
994 | __acquires(vcpu->kvm->srcu) | |
a3508fbe DH |
995 | { |
996 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
997 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
f315104a | 998 | int guest_bp_isolation; |
9ea59728 | 999 | int rc = 0; |
a3508fbe | 1000 | |
1b7029be DH |
1001 | handle_last_fault(vcpu, vsie_page); |
1002 | ||
a3508fbe DH |
1003 | if (need_resched()) |
1004 | schedule(); | |
1005 | if (test_cpu_flag(CIF_MCCK_PENDING)) | |
1006 | s390_handle_mcck(); | |
1007 | ||
1008 | srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); | |
f315104a CB |
1009 | |
1010 | /* save current guest state of bp isolation override */ | |
1011 | guest_bp_isolation = test_thread_flag(TIF_ISOLATE_BP_GUEST); | |
1012 | ||
1013 | /* | |
1014 | * The guest is running with BPBC, so we have to force it on for our | |
1015 | * nested guest. This is done by enabling BPBC globally, so the BPBC | |
1016 | * control in the SCB (which the nested guest can modify) is simply | |
1017 | * ignored. | |
1018 | */ | |
1019 | if (test_kvm_facility(vcpu->kvm, 82) && | |
1020 | vcpu->arch.sie_block->fpf & FPF_BPBC) | |
1021 | set_thread_flag(TIF_ISOLATE_BP_GUEST); | |
1022 | ||
a3508fbe | 1023 | local_irq_disable(); |
6edaa530 | 1024 | guest_enter_irqoff(); |
a3508fbe DH |
1025 | local_irq_enable(); |
1026 | ||
9ea59728 DH |
1027 | /* |
1028 | * Simulate a SIE entry of the VCPU (see sie64a), so VCPU blocking | |
1029 | * and VCPU requests also hinder the vSIE from running and lead | |
1030 | * to an immediate exit. kvm_s390_vsie_kick() has to be used to | |
1031 | * also kick the vSIE. | |
1032 | */ | |
1033 | vcpu->arch.sie_block->prog0c |= PROG_IN_SIE; | |
1034 | barrier(); | |
1035 | if (!kvm_s390_vcpu_sie_inhibited(vcpu)) | |
1036 | rc = sie64a(scb_s, vcpu->run->s.regs.gprs); | |
1037 | barrier(); | |
1038 | vcpu->arch.sie_block->prog0c &= ~PROG_IN_SIE; | |
a3508fbe DH |
1039 | |
1040 | local_irq_disable(); | |
6edaa530 | 1041 | guest_exit_irqoff(); |
a3508fbe | 1042 | local_irq_enable(); |
f315104a CB |
1043 | |
1044 | /* restore guest state for bp isolation override */ | |
1045 | if (!guest_bp_isolation) | |
1046 | clear_thread_flag(TIF_ISOLATE_BP_GUEST); | |
1047 | ||
a3508fbe DH |
1048 | vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); |
1049 | ||
d52cd207 QH |
1050 | if (rc == -EINTR) { |
1051 | VCPU_EVENT(vcpu, 3, "%s", "machine check"); | |
c95c8953 | 1052 | kvm_s390_reinject_machine_check(vcpu, &vsie_page->mcck_info); |
d52cd207 QH |
1053 | return 0; |
1054 | } | |
1055 | ||
a3508fbe DH |
1056 | if (rc > 0) |
1057 | rc = 0; /* we could still have an icpt */ | |
1058 | else if (rc == -EFAULT) | |
1059 | return handle_fault(vcpu, vsie_page); | |
1060 | ||
1061 | switch (scb_s->icptcode) { | |
66b630d5 DH |
1062 | case ICPT_INST: |
1063 | if (scb_s->ipa == 0xb2b0) | |
1064 | rc = handle_stfle(vcpu, vsie_page); | |
1065 | break; | |
a3508fbe DH |
1066 | case ICPT_STOP: |
1067 | /* stop not requested by g2 - must have been a kick */ | |
1068 | if (!(atomic_read(&scb_o->cpuflags) & CPUSTAT_STOP_INT)) | |
1069 | clear_vsie_icpt(vsie_page); | |
1070 | break; | |
1071 | case ICPT_VALIDITY: | |
1072 | if ((scb_s->ipa & 0xf000) != 0xf000) | |
1073 | scb_s->ipa += 0x1000; | |
1074 | break; | |
1075 | } | |
1076 | return rc; | |
1077 | } | |
1078 | ||
1079 | static void release_gmap_shadow(struct vsie_page *vsie_page) | |
1080 | { | |
1081 | if (vsie_page->gmap) | |
1082 | gmap_put(vsie_page->gmap); | |
1083 | WRITE_ONCE(vsie_page->gmap, NULL); | |
06d68a6c | 1084 | prefix_unmapped(vsie_page); |
a3508fbe DH |
1085 | } |
1086 | ||
1087 | static int acquire_gmap_shadow(struct kvm_vcpu *vcpu, | |
1088 | struct vsie_page *vsie_page) | |
1089 | { | |
1090 | unsigned long asce; | |
1091 | union ctlreg0 cr0; | |
1092 | struct gmap *gmap; | |
1093 | int edat; | |
1094 | ||
1095 | asce = vcpu->arch.sie_block->gcr[1]; | |
1096 | cr0.val = vcpu->arch.sie_block->gcr[0]; | |
1097 | edat = cr0.edat && test_kvm_facility(vcpu->kvm, 8); | |
1098 | edat += edat && test_kvm_facility(vcpu->kvm, 78); | |
1099 | ||
06d68a6c DH |
1100 | /* |
1101 | * ASCE or EDAT could have changed since last icpt, or the gmap | |
1102 | * we're holding has been unshadowed. If the gmap is still valid, | |
1103 | * we can safely reuse it. | |
1104 | */ | |
1105 | if (vsie_page->gmap && gmap_shadow_valid(vsie_page->gmap, asce, edat)) | |
1106 | return 0; | |
1107 | ||
1108 | /* release the old shadow - if any, and mark the prefix as unmapped */ | |
1109 | release_gmap_shadow(vsie_page); | |
a3508fbe DH |
1110 | gmap = gmap_shadow(vcpu->arch.gmap, asce, edat); |
1111 | if (IS_ERR(gmap)) | |
1112 | return PTR_ERR(gmap); | |
1113 | gmap->private = vcpu->kvm; | |
1114 | WRITE_ONCE(vsie_page->gmap, gmap); | |
1115 | return 0; | |
1116 | } | |
1117 | ||
adbf1698 DH |
1118 | /* |
1119 | * Register the shadow scb at the VCPU, e.g. for kicking out of vsie. | |
1120 | */ | |
1121 | static void register_shadow_scb(struct kvm_vcpu *vcpu, | |
1122 | struct vsie_page *vsie_page) | |
1123 | { | |
91473b48 DH |
1124 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; |
1125 | ||
adbf1698 | 1126 | WRITE_ONCE(vcpu->arch.vsie_block, &vsie_page->scb_s); |
b917ae57 DH |
1127 | /* |
1128 | * External calls have to lead to a kick of the vcpu and | |
1129 | * therefore the vsie -> Simulate Wait state. | |
1130 | */ | |
ef8f4f49 | 1131 | kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT); |
91473b48 DH |
1132 | /* |
1133 | * We have to adjust the g3 epoch by the g2 epoch. The epoch will | |
1134 | * automatically be adjusted on tod clock changes via kvm_sync_clock. | |
1135 | */ | |
1136 | preempt_disable(); | |
1137 | scb_s->epoch += vcpu->kvm->arch.epoch; | |
8fa1696e CW |
1138 | |
1139 | if (scb_s->ecd & ECD_MEF) { | |
1140 | scb_s->epdx += vcpu->kvm->arch.epdx; | |
1141 | if (scb_s->epoch < vcpu->kvm->arch.epoch) | |
1142 | scb_s->epdx += 1; | |
1143 | } | |
1144 | ||
91473b48 | 1145 | preempt_enable(); |
adbf1698 DH |
1146 | } |
1147 | ||
1148 | /* | |
1149 | * Unregister a shadow scb from a VCPU. | |
1150 | */ | |
1151 | static void unregister_shadow_scb(struct kvm_vcpu *vcpu) | |
1152 | { | |
9daecfc6 | 1153 | kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT); |
adbf1698 DH |
1154 | WRITE_ONCE(vcpu->arch.vsie_block, NULL); |
1155 | } | |
1156 | ||
a3508fbe DH |
1157 | /* |
1158 | * Run the vsie on a shadowed scb, managing the gmap shadow, handling | |
1159 | * prefix pages and faults. | |
1160 | * | |
1161 | * Returns: - 0 if no errors occurred | |
1162 | * - > 0 if control has to be given to guest 2 | |
1163 | * - -ENOMEM if out of memory | |
1164 | */ | |
1165 | static int vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
1166 | { | |
1167 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
1168 | int rc = 0; | |
1169 | ||
1170 | while (1) { | |
1171 | rc = acquire_gmap_shadow(vcpu, vsie_page); | |
1172 | if (!rc) | |
1173 | rc = map_prefix(vcpu, vsie_page); | |
1174 | if (!rc) { | |
1175 | gmap_enable(vsie_page->gmap); | |
1176 | update_intervention_requests(vsie_page); | |
1177 | rc = do_vsie_run(vcpu, vsie_page); | |
1178 | gmap_enable(vcpu->arch.gmap); | |
1179 | } | |
adbf1698 | 1180 | atomic_andnot(PROG_BLOCK_SIE, &scb_s->prog20); |
a3508fbe DH |
1181 | |
1182 | if (rc == -EAGAIN) | |
1183 | rc = 0; | |
1184 | if (rc || scb_s->icptcode || signal_pending(current) || | |
9ea59728 DH |
1185 | kvm_s390_vcpu_has_irq(vcpu, 0) || |
1186 | kvm_s390_vcpu_sie_inhibited(vcpu)) | |
a3508fbe | 1187 | break; |
0b925159 | 1188 | } |
a3508fbe DH |
1189 | |
1190 | if (rc == -EFAULT) { | |
1191 | /* | |
1192 | * Addressing exceptions are always presentes as intercepts. | |
1193 | * As addressing exceptions are suppressing and our guest 3 PSW | |
1194 | * points at the responsible instruction, we have to | |
1195 | * forward the PSW and set the ilc. If we can't read guest 3 | |
1196 | * instruction, we can use an arbitrary ilc. Let's always use | |
1197 | * ilen = 4 for now, so we can avoid reading in guest 3 virtual | |
1198 | * memory. (we could also fake the shadow so the hardware | |
1199 | * handles it). | |
1200 | */ | |
1201 | scb_s->icptcode = ICPT_PROGI; | |
1202 | scb_s->iprcc = PGM_ADDRESSING; | |
1203 | scb_s->pgmilc = 4; | |
1204 | scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, 4); | |
1205 | } | |
1206 | return rc; | |
1207 | } | |
1208 | ||
1209 | /* | |
1210 | * Get or create a vsie page for a scb address. | |
1211 | * | |
1212 | * Returns: - address of a vsie page (cached or new one) | |
1213 | * - NULL if the same scb address is already used by another VCPU | |
1214 | * - ERR_PTR(-ENOMEM) if out of memory | |
1215 | */ | |
1216 | static struct vsie_page *get_vsie_page(struct kvm *kvm, unsigned long addr) | |
1217 | { | |
1218 | struct vsie_page *vsie_page; | |
1219 | struct page *page; | |
1220 | int nr_vcpus; | |
1221 | ||
1222 | rcu_read_lock(); | |
1223 | page = radix_tree_lookup(&kvm->arch.vsie.addr_to_page, addr >> 9); | |
1224 | rcu_read_unlock(); | |
1225 | if (page) { | |
1226 | if (page_ref_inc_return(page) == 2) | |
1227 | return page_to_virt(page); | |
1228 | page_ref_dec(page); | |
1229 | } | |
1230 | ||
1231 | /* | |
1232 | * We want at least #online_vcpus shadows, so every VCPU can execute | |
1233 | * the VSIE in parallel. | |
1234 | */ | |
1235 | nr_vcpus = atomic_read(&kvm->online_vcpus); | |
1236 | ||
1237 | mutex_lock(&kvm->arch.vsie.mutex); | |
1238 | if (kvm->arch.vsie.page_count < nr_vcpus) { | |
66b630d5 | 1239 | page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA); |
a3508fbe DH |
1240 | if (!page) { |
1241 | mutex_unlock(&kvm->arch.vsie.mutex); | |
1242 | return ERR_PTR(-ENOMEM); | |
1243 | } | |
1244 | page_ref_inc(page); | |
1245 | kvm->arch.vsie.pages[kvm->arch.vsie.page_count] = page; | |
1246 | kvm->arch.vsie.page_count++; | |
1247 | } else { | |
1248 | /* reuse an existing entry that belongs to nobody */ | |
1249 | while (true) { | |
1250 | page = kvm->arch.vsie.pages[kvm->arch.vsie.next]; | |
1251 | if (page_ref_inc_return(page) == 2) | |
1252 | break; | |
1253 | page_ref_dec(page); | |
1254 | kvm->arch.vsie.next++; | |
1255 | kvm->arch.vsie.next %= nr_vcpus; | |
1256 | } | |
1257 | radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9); | |
1258 | } | |
1259 | page->index = addr; | |
1260 | /* double use of the same address */ | |
1261 | if (radix_tree_insert(&kvm->arch.vsie.addr_to_page, addr >> 9, page)) { | |
1262 | page_ref_dec(page); | |
1263 | mutex_unlock(&kvm->arch.vsie.mutex); | |
1264 | return NULL; | |
1265 | } | |
1266 | mutex_unlock(&kvm->arch.vsie.mutex); | |
1267 | ||
1268 | vsie_page = page_to_virt(page); | |
1269 | memset(&vsie_page->scb_s, 0, sizeof(struct kvm_s390_sie_block)); | |
06d68a6c | 1270 | release_gmap_shadow(vsie_page); |
1b7029be | 1271 | vsie_page->fault_addr = 0; |
a3508fbe DH |
1272 | vsie_page->scb_s.ihcpu = 0xffffU; |
1273 | return vsie_page; | |
1274 | } | |
1275 | ||
1276 | /* put a vsie page acquired via get_vsie_page */ | |
1277 | static void put_vsie_page(struct kvm *kvm, struct vsie_page *vsie_page) | |
1278 | { | |
1279 | struct page *page = pfn_to_page(__pa(vsie_page) >> PAGE_SHIFT); | |
1280 | ||
1281 | page_ref_dec(page); | |
1282 | } | |
1283 | ||
1284 | int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu) | |
1285 | { | |
1286 | struct vsie_page *vsie_page; | |
1287 | unsigned long scb_addr; | |
1288 | int rc; | |
1289 | ||
1290 | vcpu->stat.instruction_sie++; | |
1291 | if (!test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIEF2)) | |
1292 | return -EOPNOTSUPP; | |
1293 | if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) | |
1294 | return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); | |
1295 | ||
58cdf5eb | 1296 | BUILD_BUG_ON(sizeof(struct vsie_page) != PAGE_SIZE); |
a3508fbe DH |
1297 | scb_addr = kvm_s390_get_base_disp_s(vcpu, NULL); |
1298 | ||
1299 | /* 512 byte alignment */ | |
1300 | if (unlikely(scb_addr & 0x1ffUL)) | |
1301 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
1302 | ||
9ea59728 DH |
1303 | if (signal_pending(current) || kvm_s390_vcpu_has_irq(vcpu, 0) || |
1304 | kvm_s390_vcpu_sie_inhibited(vcpu)) | |
a3508fbe DH |
1305 | return 0; |
1306 | ||
1307 | vsie_page = get_vsie_page(vcpu->kvm, scb_addr); | |
1308 | if (IS_ERR(vsie_page)) | |
1309 | return PTR_ERR(vsie_page); | |
1310 | else if (!vsie_page) | |
1311 | /* double use of sie control block - simply do nothing */ | |
1312 | return 0; | |
1313 | ||
1314 | rc = pin_scb(vcpu, vsie_page, scb_addr); | |
1315 | if (rc) | |
1316 | goto out_put; | |
1317 | rc = shadow_scb(vcpu, vsie_page); | |
1318 | if (rc) | |
1319 | goto out_unpin_scb; | |
1320 | rc = pin_blocks(vcpu, vsie_page); | |
1321 | if (rc) | |
1322 | goto out_unshadow; | |
adbf1698 | 1323 | register_shadow_scb(vcpu, vsie_page); |
a3508fbe | 1324 | rc = vsie_run(vcpu, vsie_page); |
adbf1698 | 1325 | unregister_shadow_scb(vcpu); |
a3508fbe DH |
1326 | unpin_blocks(vcpu, vsie_page); |
1327 | out_unshadow: | |
1328 | unshadow_scb(vcpu, vsie_page); | |
1329 | out_unpin_scb: | |
1330 | unpin_scb(vcpu, vsie_page, scb_addr); | |
1331 | out_put: | |
1332 | put_vsie_page(vcpu->kvm, vsie_page); | |
1333 | ||
1334 | return rc < 0 ? rc : 0; | |
1335 | } | |
1336 | ||
1337 | /* Init the vsie data structures. To be called when a vm is initialized. */ | |
1338 | void kvm_s390_vsie_init(struct kvm *kvm) | |
1339 | { | |
1340 | mutex_init(&kvm->arch.vsie.mutex); | |
1341 | INIT_RADIX_TREE(&kvm->arch.vsie.addr_to_page, GFP_KERNEL); | |
1342 | } | |
1343 | ||
1344 | /* Destroy the vsie data structures. To be called when a vm is destroyed. */ | |
1345 | void kvm_s390_vsie_destroy(struct kvm *kvm) | |
1346 | { | |
06d68a6c | 1347 | struct vsie_page *vsie_page; |
a3508fbe DH |
1348 | struct page *page; |
1349 | int i; | |
1350 | ||
1351 | mutex_lock(&kvm->arch.vsie.mutex); | |
1352 | for (i = 0; i < kvm->arch.vsie.page_count; i++) { | |
1353 | page = kvm->arch.vsie.pages[i]; | |
1354 | kvm->arch.vsie.pages[i] = NULL; | |
06d68a6c DH |
1355 | vsie_page = page_to_virt(page); |
1356 | release_gmap_shadow(vsie_page); | |
a3508fbe DH |
1357 | /* free the radix tree entry */ |
1358 | radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9); | |
1359 | __free_page(page); | |
1360 | } | |
1361 | kvm->arch.vsie.page_count = 0; | |
1362 | mutex_unlock(&kvm->arch.vsie.mutex); | |
1363 | } | |
adbf1698 DH |
1364 | |
1365 | void kvm_s390_vsie_kick(struct kvm_vcpu *vcpu) | |
1366 | { | |
1367 | struct kvm_s390_sie_block *scb = READ_ONCE(vcpu->arch.vsie_block); | |
1368 | ||
1369 | /* | |
1370 | * Even if the VCPU lets go of the shadow sie block reference, it is | |
1371 | * still valid in the cache. So we can safely kick it. | |
1372 | */ | |
1373 | if (scb) { | |
1374 | atomic_or(PROG_BLOCK_SIE, &scb->prog20); | |
1375 | if (scb->prog0c & PROG_IN_SIE) | |
1376 | atomic_or(CPUSTAT_STOP_INT, &scb->cpuflags); | |
1377 | } | |
1378 | } |