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d809aa23 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a3508fbe DH |
2 | /* |
3 | * kvm nested virtualization support for s390x | |
4 | * | |
5 | * Copyright IBM Corp. 2016 | |
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 */ | |
a3508fbe | 31 | /* the pinned originial scb */ |
d52cd207 | 32 | struct kvm_s390_sie_block *scb_o; /* 0x0218 */ |
a3508fbe | 33 | /* the shadow gmap in use by the vsie_page */ |
d52cd207 | 34 | struct gmap *gmap; /* 0x0220 */ |
1b7029be | 35 | /* address of the last reported fault to guest2 */ |
d52cd207 QH |
36 | unsigned long fault_addr; /* 0x0228 */ |
37 | __u8 reserved[0x0700 - 0x0230]; /* 0x0230 */ | |
bbeaa58b | 38 | struct kvm_s390_crypto_cb crycb; /* 0x0700 */ |
66b630d5 | 39 | __u8 fac[S390_ARCH_FAC_LIST_SIZE_BYTE]; /* 0x0800 */ |
1cae0255 | 40 | }; |
a3508fbe DH |
41 | |
42 | /* trigger a validity icpt for the given scb */ | |
43 | static int set_validity_icpt(struct kvm_s390_sie_block *scb, | |
44 | __u16 reason_code) | |
45 | { | |
46 | scb->ipa = 0x1000; | |
47 | scb->ipb = ((__u32) reason_code) << 16; | |
48 | scb->icptcode = ICPT_VALIDITY; | |
49 | return 1; | |
50 | } | |
51 | ||
52 | /* mark the prefix as unmapped, this will block the VSIE */ | |
53 | static void prefix_unmapped(struct vsie_page *vsie_page) | |
54 | { | |
55 | atomic_or(PROG_REQUEST, &vsie_page->scb_s.prog20); | |
56 | } | |
57 | ||
58 | /* mark the prefix as unmapped and wait until the VSIE has been left */ | |
59 | static void prefix_unmapped_sync(struct vsie_page *vsie_page) | |
60 | { | |
61 | prefix_unmapped(vsie_page); | |
62 | if (vsie_page->scb_s.prog0c & PROG_IN_SIE) | |
63 | atomic_or(CPUSTAT_STOP_INT, &vsie_page->scb_s.cpuflags); | |
64 | while (vsie_page->scb_s.prog0c & PROG_IN_SIE) | |
65 | cpu_relax(); | |
66 | } | |
67 | ||
68 | /* mark the prefix as mapped, this will allow the VSIE to run */ | |
69 | static void prefix_mapped(struct vsie_page *vsie_page) | |
70 | { | |
71 | atomic_andnot(PROG_REQUEST, &vsie_page->scb_s.prog20); | |
72 | } | |
73 | ||
06d68a6c DH |
74 | /* test if the prefix is mapped into the gmap shadow */ |
75 | static int prefix_is_mapped(struct vsie_page *vsie_page) | |
76 | { | |
77 | return !(atomic_read(&vsie_page->scb_s.prog20) & PROG_REQUEST); | |
78 | } | |
a3508fbe DH |
79 | |
80 | /* copy the updated intervention request bits into the shadow scb */ | |
81 | static void update_intervention_requests(struct vsie_page *vsie_page) | |
82 | { | |
83 | const int bits = CPUSTAT_STOP_INT | CPUSTAT_IO_INT | CPUSTAT_EXT_INT; | |
84 | int cpuflags; | |
85 | ||
86 | cpuflags = atomic_read(&vsie_page->scb_o->cpuflags); | |
87 | atomic_andnot(bits, &vsie_page->scb_s.cpuflags); | |
88 | atomic_or(cpuflags & bits, &vsie_page->scb_s.cpuflags); | |
89 | } | |
90 | ||
91 | /* shadow (filter and validate) the cpuflags */ | |
92 | static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
93 | { | |
94 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
95 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
96 | int newflags, cpuflags = atomic_read(&scb_o->cpuflags); | |
97 | ||
98 | /* we don't allow ESA/390 guests */ | |
99 | if (!(cpuflags & CPUSTAT_ZARCH)) | |
100 | return set_validity_icpt(scb_s, 0x0001U); | |
101 | ||
102 | if (cpuflags & (CPUSTAT_RRF | CPUSTAT_MCDS)) | |
103 | return set_validity_icpt(scb_s, 0x0001U); | |
104 | else if (cpuflags & (CPUSTAT_SLSV | CPUSTAT_SLSR)) | |
105 | return set_validity_icpt(scb_s, 0x0007U); | |
106 | ||
107 | /* intervention requests will be set later */ | |
108 | newflags = CPUSTAT_ZARCH; | |
535ef81c DH |
109 | if (cpuflags & CPUSTAT_GED && test_kvm_facility(vcpu->kvm, 8)) |
110 | newflags |= CPUSTAT_GED; | |
111 | if (cpuflags & CPUSTAT_GED2 && test_kvm_facility(vcpu->kvm, 78)) { | |
112 | if (cpuflags & CPUSTAT_GED) | |
113 | return set_validity_icpt(scb_s, 0x0001U); | |
114 | newflags |= CPUSTAT_GED2; | |
115 | } | |
77d18f6d DH |
116 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GPERE)) |
117 | newflags |= cpuflags & CPUSTAT_P; | |
a1b7b9b2 DH |
118 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GSLS)) |
119 | newflags |= cpuflags & CPUSTAT_SM; | |
7fd7f39d DH |
120 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IBS)) |
121 | newflags |= cpuflags & CPUSTAT_IBS; | |
730cd632 FA |
122 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_KSS)) |
123 | newflags |= cpuflags & CPUSTAT_KSS; | |
a3508fbe DH |
124 | |
125 | atomic_set(&scb_s->cpuflags, newflags); | |
126 | return 0; | |
127 | } | |
128 | ||
bbeaa58b DH |
129 | /* |
130 | * Create a shadow copy of the crycb block and setup key wrapping, if | |
131 | * requested for guest 3 and enabled for guest 2. | |
132 | * | |
133 | * We only accept format-1 (no AP in g2), but convert it into format-2 | |
134 | * There is nothing to do for format-0. | |
135 | * | |
136 | * Returns: - 0 if shadowed or nothing to do | |
137 | * - > 0 if control has to be given to guest 2 | |
138 | */ | |
139 | static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
140 | { | |
141 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
142 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
143 | u32 crycb_addr = scb_o->crycbd & 0x7ffffff8U; | |
144 | unsigned long *b1, *b2; | |
145 | u8 ecb3_flags; | |
146 | ||
147 | scb_s->crycbd = 0; | |
148 | if (!(scb_o->crycbd & vcpu->arch.sie_block->crycbd & CRYCB_FORMAT1)) | |
149 | return 0; | |
150 | /* format-1 is supported with message-security-assist extension 3 */ | |
151 | if (!test_kvm_facility(vcpu->kvm, 76)) | |
152 | return 0; | |
153 | /* we may only allow it if enabled for guest 2 */ | |
154 | ecb3_flags = scb_o->ecb3 & vcpu->arch.sie_block->ecb3 & | |
155 | (ECB3_AES | ECB3_DEA); | |
156 | if (!ecb3_flags) | |
157 | return 0; | |
158 | ||
159 | if ((crycb_addr & PAGE_MASK) != ((crycb_addr + 128) & PAGE_MASK)) | |
160 | return set_validity_icpt(scb_s, 0x003CU); | |
161 | else if (!crycb_addr) | |
162 | return set_validity_icpt(scb_s, 0x0039U); | |
163 | ||
164 | /* copy only the wrapping keys */ | |
165 | if (read_guest_real(vcpu, crycb_addr + 72, &vsie_page->crycb, 56)) | |
166 | return set_validity_icpt(scb_s, 0x0035U); | |
167 | ||
168 | scb_s->ecb3 |= ecb3_flags; | |
169 | scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | CRYCB_FORMAT1 | | |
170 | CRYCB_FORMAT2; | |
171 | ||
172 | /* xor both blocks in one run */ | |
173 | b1 = (unsigned long *) vsie_page->crycb.dea_wrapping_key_mask; | |
174 | b2 = (unsigned long *) | |
175 | vcpu->kvm->arch.crypto.crycb->dea_wrapping_key_mask; | |
176 | /* as 56%8 == 0, bitmap_xor won't overwrite any data */ | |
177 | bitmap_xor(b1, b1, b2, BITS_PER_BYTE * 56); | |
178 | return 0; | |
179 | } | |
180 | ||
3573602b DH |
181 | /* shadow (round up/down) the ibc to avoid validity icpt */ |
182 | static void prepare_ibc(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
183 | { | |
184 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
185 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
186 | __u64 min_ibc = (sclp.ibc >> 16) & 0x0fffU; | |
187 | ||
188 | scb_s->ibc = 0; | |
189 | /* ibc installed in g2 and requested for g3 */ | |
190 | if (vcpu->kvm->arch.model.ibc && (scb_o->ibc & 0x0fffU)) { | |
191 | scb_s->ibc = scb_o->ibc & 0x0fffU; | |
192 | /* takte care of the minimum ibc level of the machine */ | |
193 | if (scb_s->ibc < min_ibc) | |
194 | scb_s->ibc = min_ibc; | |
195 | /* take care of the maximum ibc level set for the guest */ | |
196 | if (scb_s->ibc > vcpu->kvm->arch.model.ibc) | |
197 | scb_s->ibc = vcpu->kvm->arch.model.ibc; | |
198 | } | |
199 | } | |
200 | ||
a3508fbe DH |
201 | /* unshadow the scb, copying parameters back to the real scb */ |
202 | static void unshadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
203 | { | |
204 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
205 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
206 | ||
207 | /* interception */ | |
208 | scb_o->icptcode = scb_s->icptcode; | |
209 | scb_o->icptstatus = scb_s->icptstatus; | |
210 | scb_o->ipa = scb_s->ipa; | |
211 | scb_o->ipb = scb_s->ipb; | |
212 | scb_o->gbea = scb_s->gbea; | |
213 | ||
214 | /* timer */ | |
215 | scb_o->cputm = scb_s->cputm; | |
216 | scb_o->ckc = scb_s->ckc; | |
217 | scb_o->todpr = scb_s->todpr; | |
218 | ||
219 | /* guest state */ | |
220 | scb_o->gpsw = scb_s->gpsw; | |
221 | scb_o->gg14 = scb_s->gg14; | |
222 | scb_o->gg15 = scb_s->gg15; | |
223 | memcpy(scb_o->gcr, scb_s->gcr, 128); | |
224 | scb_o->pp = scb_s->pp; | |
225 | ||
226 | /* interrupt intercept */ | |
227 | switch (scb_s->icptcode) { | |
228 | case ICPT_PROGI: | |
229 | case ICPT_INSTPROGI: | |
230 | case ICPT_EXTINT: | |
231 | memcpy((void *)((u64)scb_o + 0xc0), | |
232 | (void *)((u64)scb_s + 0xc0), 0xf0 - 0xc0); | |
233 | break; | |
234 | case ICPT_PARTEXEC: | |
235 | /* MVPG only */ | |
236 | memcpy((void *)((u64)scb_o + 0xc0), | |
237 | (void *)((u64)scb_s + 0xc0), 0xd0 - 0xc0); | |
238 | break; | |
239 | } | |
240 | ||
241 | if (scb_s->ihcpu != 0xffffU) | |
242 | scb_o->ihcpu = scb_s->ihcpu; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Setup the shadow scb by copying and checking the relevant parts of the g2 | |
247 | * provided scb. | |
248 | * | |
249 | * Returns: - 0 if the scb has been shadowed | |
250 | * - > 0 if control has to be given to guest 2 | |
251 | */ | |
252 | static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
253 | { | |
254 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
255 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
0c9d8683 | 256 | bool had_tx = scb_s->ecb & ECB_TE; |
a1b7b9b2 | 257 | unsigned long new_mso = 0; |
a3508fbe DH |
258 | int rc; |
259 | ||
260 | /* make sure we don't have any leftovers when reusing the scb */ | |
261 | scb_s->icptcode = 0; | |
262 | scb_s->eca = 0; | |
263 | scb_s->ecb = 0; | |
264 | scb_s->ecb2 = 0; | |
265 | scb_s->ecb3 = 0; | |
266 | scb_s->ecd = 0; | |
66b630d5 | 267 | scb_s->fac = 0; |
a3508fbe DH |
268 | |
269 | rc = prepare_cpuflags(vcpu, vsie_page); | |
270 | if (rc) | |
271 | goto out; | |
272 | ||
273 | /* timer */ | |
274 | scb_s->cputm = scb_o->cputm; | |
275 | scb_s->ckc = scb_o->ckc; | |
276 | scb_s->todpr = scb_o->todpr; | |
277 | scb_s->epoch = scb_o->epoch; | |
278 | ||
279 | /* guest state */ | |
280 | scb_s->gpsw = scb_o->gpsw; | |
281 | scb_s->gg14 = scb_o->gg14; | |
282 | scb_s->gg15 = scb_o->gg15; | |
283 | memcpy(scb_s->gcr, scb_o->gcr, 128); | |
284 | scb_s->pp = scb_o->pp; | |
285 | ||
286 | /* interception / execution handling */ | |
287 | scb_s->gbea = scb_o->gbea; | |
288 | scb_s->lctl = scb_o->lctl; | |
289 | scb_s->svcc = scb_o->svcc; | |
290 | scb_s->ictl = scb_o->ictl; | |
291 | /* | |
292 | * SKEY handling functions can't deal with false setting of PTE invalid | |
293 | * bits. Therefore we cannot provide interpretation and would later | |
294 | * have to provide own emulation handlers. | |
295 | */ | |
730cd632 FA |
296 | if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_KSS)) |
297 | scb_s->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; | |
298 | ||
a3508fbe DH |
299 | scb_s->icpua = scb_o->icpua; |
300 | ||
a1b7b9b2 DH |
301 | if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_SM)) |
302 | new_mso = scb_o->mso & 0xfffffffffff00000UL; | |
06d68a6c DH |
303 | /* if the hva of the prefix changes, we have to remap the prefix */ |
304 | if (scb_s->mso != new_mso || scb_s->prefix != scb_o->prefix) | |
305 | prefix_unmapped(vsie_page); | |
a3508fbe DH |
306 | /* SIE will do mso/msl validity and exception checks for us */ |
307 | scb_s->msl = scb_o->msl & 0xfffffffffff00000UL; | |
06d68a6c | 308 | scb_s->mso = new_mso; |
a3508fbe DH |
309 | scb_s->prefix = scb_o->prefix; |
310 | ||
311 | /* We have to definetly flush the tlb if this scb never ran */ | |
312 | if (scb_s->ihcpu != 0xffffU) | |
313 | scb_s->ihcpu = scb_o->ihcpu; | |
314 | ||
315 | /* MVPG and Protection Exception Interpretation are always available */ | |
0c9d8683 | 316 | scb_s->eca |= scb_o->eca & (ECA_MVPGI | ECA_PROTEXCI); |
4ceafa90 DH |
317 | /* Host-protection-interruption introduced with ESOP */ |
318 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_ESOP)) | |
0c9d8683 | 319 | scb_s->ecb |= scb_o->ecb & ECB_HOSTPROTINT; |
166ecb3d DH |
320 | /* transactional execution */ |
321 | if (test_kvm_facility(vcpu->kvm, 73)) { | |
322 | /* remap the prefix is tx is toggled on */ | |
0c9d8683 | 323 | if ((scb_o->ecb & ECB_TE) && !had_tx) |
166ecb3d | 324 | prefix_unmapped(vsie_page); |
0c9d8683 | 325 | scb_s->ecb |= scb_o->ecb & ECB_TE; |
166ecb3d | 326 | } |
c9bc1eab DH |
327 | /* SIMD */ |
328 | if (test_kvm_facility(vcpu->kvm, 129)) { | |
0c9d8683 DH |
329 | scb_s->eca |= scb_o->eca & ECA_VX; |
330 | scb_s->ecd |= scb_o->ecd & ECD_HOSTREGMGMT; | |
c9bc1eab | 331 | } |
588438cb DH |
332 | /* Run-time-Instrumentation */ |
333 | if (test_kvm_facility(vcpu->kvm, 64)) | |
0c9d8683 | 334 | scb_s->ecb3 |= scb_o->ecb3 & ECB3_RI; |
cd1836f5 JF |
335 | /* Instruction Execution Prevention */ |
336 | if (test_kvm_facility(vcpu->kvm, 130)) | |
0c9d8683 | 337 | scb_s->ecb2 |= scb_o->ecb2 & ECB2_IEP; |
4e0b1ab7 FZ |
338 | /* Guarded Storage */ |
339 | if (test_kvm_facility(vcpu->kvm, 133)) { | |
340 | scb_s->ecb |= scb_o->ecb & ECB_GS; | |
341 | scb_s->ecd |= scb_o->ecd & ECD_HOSTREGMGMT; | |
342 | } | |
0615a326 | 343 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIIF)) |
0c9d8683 | 344 | scb_s->eca |= scb_o->eca & ECA_SII; |
5630a8e8 | 345 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IB)) |
0c9d8683 | 346 | scb_s->eca |= scb_o->eca & ECA_IB; |
13ee3f67 | 347 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_CEI)) |
0c9d8683 | 348 | scb_s->eca |= scb_o->eca & ECA_CEI; |
8fa1696e CW |
349 | /* Epoch Extension */ |
350 | if (test_kvm_facility(vcpu->kvm, 139)) | |
351 | scb_s->ecd |= scb_o->ecd & ECD_MEF; | |
a3508fbe | 352 | |
3573602b | 353 | prepare_ibc(vcpu, vsie_page); |
bbeaa58b | 354 | rc = shadow_crycb(vcpu, vsie_page); |
a3508fbe DH |
355 | out: |
356 | if (rc) | |
357 | unshadow_scb(vcpu, vsie_page); | |
358 | return rc; | |
359 | } | |
360 | ||
361 | void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start, | |
362 | unsigned long end) | |
363 | { | |
364 | struct kvm *kvm = gmap->private; | |
365 | struct vsie_page *cur; | |
366 | unsigned long prefix; | |
367 | struct page *page; | |
368 | int i; | |
369 | ||
370 | if (!gmap_is_shadow(gmap)) | |
371 | return; | |
372 | if (start >= 1UL << 31) | |
373 | /* We are only interested in prefix pages */ | |
374 | return; | |
375 | ||
376 | /* | |
377 | * Only new shadow blocks are added to the list during runtime, | |
378 | * therefore we can safely reference them all the time. | |
379 | */ | |
380 | for (i = 0; i < kvm->arch.vsie.page_count; i++) { | |
381 | page = READ_ONCE(kvm->arch.vsie.pages[i]); | |
382 | if (!page) | |
383 | continue; | |
384 | cur = page_to_virt(page); | |
385 | if (READ_ONCE(cur->gmap) != gmap) | |
386 | continue; | |
387 | prefix = cur->scb_s.prefix << GUEST_PREFIX_SHIFT; | |
388 | /* with mso/msl, the prefix lies at an offset */ | |
389 | prefix += cur->scb_s.mso; | |
166ecb3d | 390 | if (prefix <= end && start <= prefix + 2 * PAGE_SIZE - 1) |
a3508fbe DH |
391 | prefix_unmapped_sync(cur); |
392 | } | |
393 | } | |
394 | ||
395 | /* | |
166ecb3d | 396 | * Map the first prefix page and if tx is enabled also the second prefix page. |
a3508fbe DH |
397 | * |
398 | * The prefix will be protected, a gmap notifier will inform about unmaps. | |
399 | * The shadow scb must not be executed until the prefix is remapped, this is | |
400 | * guaranteed by properly handling PROG_REQUEST. | |
401 | * | |
402 | * Returns: - 0 on if successfully mapped or already mapped | |
403 | * - > 0 if control has to be given to guest 2 | |
404 | * - -EAGAIN if the caller can retry immediately | |
405 | * - -ENOMEM if out of memory | |
406 | */ | |
407 | static int map_prefix(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
408 | { | |
409 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
410 | u64 prefix = scb_s->prefix << GUEST_PREFIX_SHIFT; | |
411 | int rc; | |
412 | ||
06d68a6c DH |
413 | if (prefix_is_mapped(vsie_page)) |
414 | return 0; | |
415 | ||
a3508fbe DH |
416 | /* mark it as mapped so we can catch any concurrent unmappers */ |
417 | prefix_mapped(vsie_page); | |
418 | ||
419 | /* with mso/msl, the prefix lies at offset *mso* */ | |
420 | prefix += scb_s->mso; | |
421 | ||
422 | rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, prefix); | |
0c9d8683 | 423 | if (!rc && (scb_s->ecb & ECB_TE)) |
166ecb3d DH |
424 | rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, |
425 | prefix + PAGE_SIZE); | |
a3508fbe DH |
426 | /* |
427 | * We don't have to mprotect, we will be called for all unshadows. | |
428 | * SIE will detect if protection applies and trigger a validity. | |
429 | */ | |
430 | if (rc) | |
431 | prefix_unmapped(vsie_page); | |
432 | if (rc > 0 || rc == -EFAULT) | |
433 | rc = set_validity_icpt(scb_s, 0x0037U); | |
434 | return rc; | |
435 | } | |
436 | ||
437 | /* | |
438 | * Pin the guest page given by gpa and set hpa to the pinned host address. | |
439 | * Will always be pinned writable. | |
440 | * | |
441 | * Returns: - 0 on success | |
442 | * - -EINVAL if the gpa is not valid guest storage | |
a3508fbe DH |
443 | */ |
444 | static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa) | |
445 | { | |
446 | struct page *page; | |
a3508fbe | 447 | |
f7a6509f DH |
448 | page = gfn_to_page(kvm, gpa_to_gfn(gpa)); |
449 | if (is_error_page(page)) | |
a3508fbe | 450 | return -EINVAL; |
a3508fbe DH |
451 | *hpa = (hpa_t) page_to_virt(page) + (gpa & ~PAGE_MASK); |
452 | return 0; | |
453 | } | |
454 | ||
455 | /* Unpins a page previously pinned via pin_guest_page, marking it as dirty. */ | |
456 | static void unpin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t hpa) | |
457 | { | |
f7a6509f | 458 | kvm_release_pfn_dirty(hpa >> PAGE_SHIFT); |
a3508fbe DH |
459 | /* mark the page always as dirty for migration */ |
460 | mark_page_dirty(kvm, gpa_to_gfn(gpa)); | |
461 | } | |
462 | ||
463 | /* unpin all blocks previously pinned by pin_blocks(), marking them dirty */ | |
464 | static void unpin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
465 | { | |
466 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
467 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
468 | hpa_t hpa; | |
469 | gpa_t gpa; | |
470 | ||
471 | hpa = (u64) scb_s->scaoh << 32 | scb_s->scaol; | |
472 | if (hpa) { | |
473 | gpa = scb_o->scaol & ~0xfUL; | |
19c439b5 DH |
474 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO)) |
475 | gpa |= (u64) scb_o->scaoh << 32; | |
a3508fbe DH |
476 | unpin_guest_page(vcpu->kvm, gpa, hpa); |
477 | scb_s->scaol = 0; | |
478 | scb_s->scaoh = 0; | |
479 | } | |
166ecb3d DH |
480 | |
481 | hpa = scb_s->itdba; | |
482 | if (hpa) { | |
483 | gpa = scb_o->itdba & ~0xffUL; | |
484 | unpin_guest_page(vcpu->kvm, gpa, hpa); | |
485 | scb_s->itdba = 0; | |
486 | } | |
c9bc1eab DH |
487 | |
488 | hpa = scb_s->gvrd; | |
489 | if (hpa) { | |
490 | gpa = scb_o->gvrd & ~0x1ffUL; | |
491 | unpin_guest_page(vcpu->kvm, gpa, hpa); | |
492 | scb_s->gvrd = 0; | |
493 | } | |
588438cb DH |
494 | |
495 | hpa = scb_s->riccbd; | |
496 | if (hpa) { | |
497 | gpa = scb_o->riccbd & ~0x3fUL; | |
498 | unpin_guest_page(vcpu->kvm, gpa, hpa); | |
499 | scb_s->riccbd = 0; | |
500 | } | |
4e0b1ab7 FZ |
501 | |
502 | hpa = scb_s->sdnxo; | |
503 | if (hpa) { | |
504 | gpa = scb_o->sdnxo; | |
505 | unpin_guest_page(vcpu->kvm, gpa, hpa); | |
506 | scb_s->sdnxo = 0; | |
507 | } | |
a3508fbe DH |
508 | } |
509 | ||
510 | /* | |
511 | * Instead of shadowing some blocks, we can simply forward them because the | |
512 | * addresses in the scb are 64 bit long. | |
513 | * | |
514 | * This works as long as the data lies in one page. If blocks ever exceed one | |
515 | * page, we have to fall back to shadowing. | |
516 | * | |
517 | * As we reuse the sca, the vcpu pointers contained in it are invalid. We must | |
518 | * therefore not enable any facilities that access these pointers (e.g. SIGPIF). | |
519 | * | |
520 | * Returns: - 0 if all blocks were pinned. | |
521 | * - > 0 if control has to be given to guest 2 | |
522 | * - -ENOMEM if out of memory | |
523 | */ | |
524 | static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
525 | { | |
526 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
527 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
528 | hpa_t hpa; | |
529 | gpa_t gpa; | |
530 | int rc = 0; | |
531 | ||
532 | gpa = scb_o->scaol & ~0xfUL; | |
19c439b5 DH |
533 | if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO)) |
534 | gpa |= (u64) scb_o->scaoh << 32; | |
a3508fbe DH |
535 | if (gpa) { |
536 | if (!(gpa & ~0x1fffUL)) | |
537 | rc = set_validity_icpt(scb_s, 0x0038U); | |
538 | else if ((gpa & ~0x1fffUL) == kvm_s390_get_prefix(vcpu)) | |
539 | rc = set_validity_icpt(scb_s, 0x0011U); | |
540 | else if ((gpa & PAGE_MASK) != | |
541 | ((gpa + sizeof(struct bsca_block) - 1) & PAGE_MASK)) | |
542 | rc = set_validity_icpt(scb_s, 0x003bU); | |
543 | if (!rc) { | |
544 | rc = pin_guest_page(vcpu->kvm, gpa, &hpa); | |
f7a6509f | 545 | if (rc) |
a3508fbe DH |
546 | rc = set_validity_icpt(scb_s, 0x0034U); |
547 | } | |
548 | if (rc) | |
549 | goto unpin; | |
550 | scb_s->scaoh = (u32)((u64)hpa >> 32); | |
551 | scb_s->scaol = (u32)(u64)hpa; | |
552 | } | |
166ecb3d DH |
553 | |
554 | gpa = scb_o->itdba & ~0xffUL; | |
0c9d8683 | 555 | if (gpa && (scb_s->ecb & ECB_TE)) { |
166ecb3d DH |
556 | if (!(gpa & ~0x1fffU)) { |
557 | rc = set_validity_icpt(scb_s, 0x0080U); | |
558 | goto unpin; | |
559 | } | |
560 | /* 256 bytes cannot cross page boundaries */ | |
561 | rc = pin_guest_page(vcpu->kvm, gpa, &hpa); | |
f7a6509f | 562 | if (rc) { |
166ecb3d | 563 | rc = set_validity_icpt(scb_s, 0x0080U); |
166ecb3d | 564 | goto unpin; |
f7a6509f | 565 | } |
166ecb3d DH |
566 | scb_s->itdba = hpa; |
567 | } | |
c9bc1eab DH |
568 | |
569 | gpa = scb_o->gvrd & ~0x1ffUL; | |
0c9d8683 | 570 | if (gpa && (scb_s->eca & ECA_VX) && !(scb_s->ecd & ECD_HOSTREGMGMT)) { |
c9bc1eab DH |
571 | if (!(gpa & ~0x1fffUL)) { |
572 | rc = set_validity_icpt(scb_s, 0x1310U); | |
573 | goto unpin; | |
574 | } | |
575 | /* | |
576 | * 512 bytes vector registers cannot cross page boundaries | |
577 | * if this block gets bigger, we have to shadow it. | |
578 | */ | |
579 | rc = pin_guest_page(vcpu->kvm, gpa, &hpa); | |
f7a6509f | 580 | if (rc) { |
c9bc1eab | 581 | rc = set_validity_icpt(scb_s, 0x1310U); |
c9bc1eab | 582 | goto unpin; |
f7a6509f | 583 | } |
c9bc1eab DH |
584 | scb_s->gvrd = hpa; |
585 | } | |
588438cb DH |
586 | |
587 | gpa = scb_o->riccbd & ~0x3fUL; | |
0c9d8683 | 588 | if (gpa && (scb_s->ecb3 & ECB3_RI)) { |
588438cb DH |
589 | if (!(gpa & ~0x1fffUL)) { |
590 | rc = set_validity_icpt(scb_s, 0x0043U); | |
591 | goto unpin; | |
592 | } | |
593 | /* 64 bytes cannot cross page boundaries */ | |
594 | rc = pin_guest_page(vcpu->kvm, gpa, &hpa); | |
f7a6509f | 595 | if (rc) { |
588438cb | 596 | rc = set_validity_icpt(scb_s, 0x0043U); |
588438cb | 597 | goto unpin; |
f7a6509f DH |
598 | } |
599 | /* Validity 0x0044 will be checked by SIE */ | |
4d21cef3 | 600 | scb_s->riccbd = hpa; |
588438cb | 601 | } |
4e0b1ab7 FZ |
602 | if ((scb_s->ecb & ECB_GS) && !(scb_s->ecd & ECD_HOSTREGMGMT)) { |
603 | unsigned long sdnxc; | |
604 | ||
605 | gpa = scb_o->sdnxo & ~0xfUL; | |
606 | sdnxc = scb_o->sdnxo & 0xfUL; | |
607 | if (!gpa || !(gpa & ~0x1fffUL)) { | |
608 | rc = set_validity_icpt(scb_s, 0x10b0U); | |
609 | goto unpin; | |
610 | } | |
611 | if (sdnxc < 6 || sdnxc > 12) { | |
612 | rc = set_validity_icpt(scb_s, 0x10b1U); | |
613 | goto unpin; | |
614 | } | |
615 | if (gpa & ((1 << sdnxc) - 1)) { | |
616 | rc = set_validity_icpt(scb_s, 0x10b2U); | |
617 | goto unpin; | |
618 | } | |
619 | /* Due to alignment rules (checked above) this cannot | |
620 | * cross page boundaries | |
621 | */ | |
622 | rc = pin_guest_page(vcpu->kvm, gpa, &hpa); | |
f7a6509f | 623 | if (rc) { |
4e0b1ab7 | 624 | rc = set_validity_icpt(scb_s, 0x10b0U); |
4e0b1ab7 | 625 | goto unpin; |
f7a6509f | 626 | } |
fe722d13 | 627 | scb_s->sdnxo = hpa | sdnxc; |
4e0b1ab7 | 628 | } |
a3508fbe DH |
629 | return 0; |
630 | unpin: | |
631 | unpin_blocks(vcpu, vsie_page); | |
632 | return rc; | |
633 | } | |
634 | ||
635 | /* unpin the scb provided by guest 2, marking it as dirty */ | |
636 | static void unpin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, | |
637 | gpa_t gpa) | |
638 | { | |
639 | hpa_t hpa = (hpa_t) vsie_page->scb_o; | |
640 | ||
641 | if (hpa) | |
642 | unpin_guest_page(vcpu->kvm, gpa, hpa); | |
643 | vsie_page->scb_o = NULL; | |
644 | } | |
645 | ||
646 | /* | |
647 | * Pin the scb at gpa provided by guest 2 at vsie_page->scb_o. | |
648 | * | |
649 | * Returns: - 0 if the scb was pinned. | |
650 | * - > 0 if control has to be given to guest 2 | |
a3508fbe DH |
651 | */ |
652 | static int pin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, | |
653 | gpa_t gpa) | |
654 | { | |
655 | hpa_t hpa; | |
656 | int rc; | |
657 | ||
658 | rc = pin_guest_page(vcpu->kvm, gpa, &hpa); | |
f7a6509f | 659 | if (rc) { |
a3508fbe | 660 | rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
f7a6509f DH |
661 | WARN_ON_ONCE(rc); |
662 | return 1; | |
a3508fbe | 663 | } |
f7a6509f DH |
664 | vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa; |
665 | return 0; | |
a3508fbe DH |
666 | } |
667 | ||
668 | /* | |
669 | * Inject a fault into guest 2. | |
670 | * | |
671 | * Returns: - > 0 if control has to be given to guest 2 | |
672 | * < 0 if an error occurred during injection. | |
673 | */ | |
674 | static int inject_fault(struct kvm_vcpu *vcpu, __u16 code, __u64 vaddr, | |
675 | bool write_flag) | |
676 | { | |
677 | struct kvm_s390_pgm_info pgm = { | |
678 | .code = code, | |
679 | .trans_exc_code = | |
680 | /* 0-51: virtual address */ | |
681 | (vaddr & 0xfffffffffffff000UL) | | |
682 | /* 52-53: store / fetch */ | |
683 | (((unsigned int) !write_flag) + 1) << 10, | |
684 | /* 62-63: asce id (alway primary == 0) */ | |
685 | .exc_access_id = 0, /* always primary */ | |
686 | .op_access_id = 0, /* not MVPG */ | |
687 | }; | |
688 | int rc; | |
689 | ||
690 | if (code == PGM_PROTECTION) | |
691 | pgm.trans_exc_code |= 0x4UL; | |
692 | ||
693 | rc = kvm_s390_inject_prog_irq(vcpu, &pgm); | |
694 | return rc ? rc : 1; | |
695 | } | |
696 | ||
697 | /* | |
698 | * Handle a fault during vsie execution on a gmap shadow. | |
699 | * | |
700 | * Returns: - 0 if the fault was resolved | |
701 | * - > 0 if control has to be given to guest 2 | |
702 | * - < 0 if an error occurred | |
703 | */ | |
704 | static int handle_fault(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
705 | { | |
706 | int rc; | |
707 | ||
708 | if (current->thread.gmap_int_code == PGM_PROTECTION) | |
709 | /* we can directly forward all protection exceptions */ | |
710 | return inject_fault(vcpu, PGM_PROTECTION, | |
711 | current->thread.gmap_addr, 1); | |
712 | ||
713 | rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, | |
714 | current->thread.gmap_addr); | |
715 | if (rc > 0) { | |
716 | rc = inject_fault(vcpu, rc, | |
717 | current->thread.gmap_addr, | |
718 | current->thread.gmap_write_flag); | |
1b7029be DH |
719 | if (rc >= 0) |
720 | vsie_page->fault_addr = current->thread.gmap_addr; | |
a3508fbe DH |
721 | } |
722 | return rc; | |
723 | } | |
724 | ||
1b7029be DH |
725 | /* |
726 | * Retry the previous fault that required guest 2 intervention. This avoids | |
727 | * one superfluous SIE re-entry and direct exit. | |
728 | * | |
729 | * Will ignore any errors. The next SIE fault will do proper fault handling. | |
730 | */ | |
731 | static void handle_last_fault(struct kvm_vcpu *vcpu, | |
732 | struct vsie_page *vsie_page) | |
733 | { | |
734 | if (vsie_page->fault_addr) | |
735 | kvm_s390_shadow_fault(vcpu, vsie_page->gmap, | |
736 | vsie_page->fault_addr); | |
737 | vsie_page->fault_addr = 0; | |
738 | } | |
739 | ||
a3508fbe DH |
740 | static inline void clear_vsie_icpt(struct vsie_page *vsie_page) |
741 | { | |
742 | vsie_page->scb_s.icptcode = 0; | |
743 | } | |
744 | ||
66b630d5 DH |
745 | /* rewind the psw and clear the vsie icpt, so we can retry execution */ |
746 | static void retry_vsie_icpt(struct vsie_page *vsie_page) | |
747 | { | |
748 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
749 | int ilen = insn_length(scb_s->ipa >> 8); | |
750 | ||
751 | /* take care of EXECUTE instructions */ | |
752 | if (scb_s->icptstatus & 1) { | |
753 | ilen = (scb_s->icptstatus >> 4) & 0x6; | |
754 | if (!ilen) | |
755 | ilen = 4; | |
756 | } | |
757 | scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, ilen); | |
758 | clear_vsie_icpt(vsie_page); | |
759 | } | |
760 | ||
761 | /* | |
762 | * Try to shadow + enable the guest 2 provided facility list. | |
763 | * Retry instruction execution if enabled for and provided by guest 2. | |
764 | * | |
765 | * Returns: - 0 if handled (retry or guest 2 icpt) | |
766 | * - > 0 if control has to be given to guest 2 | |
767 | */ | |
768 | static int handle_stfle(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
769 | { | |
770 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
771 | __u32 fac = vsie_page->scb_o->fac & 0x7ffffff8U; | |
772 | ||
773 | if (fac && test_kvm_facility(vcpu->kvm, 7)) { | |
774 | retry_vsie_icpt(vsie_page); | |
775 | if (read_guest_real(vcpu, fac, &vsie_page->fac, | |
776 | sizeof(vsie_page->fac))) | |
777 | return set_validity_icpt(scb_s, 0x1090U); | |
778 | scb_s->fac = (__u32)(__u64) &vsie_page->fac; | |
779 | } | |
780 | return 0; | |
781 | } | |
782 | ||
a3508fbe DH |
783 | /* |
784 | * Run the vsie on a shadow scb and a shadow gmap, without any further | |
785 | * sanity checks, handling SIE faults. | |
786 | * | |
787 | * Returns: - 0 everything went fine | |
788 | * - > 0 if control has to be given to guest 2 | |
789 | * - < 0 if an error occurred | |
790 | */ | |
791 | static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
792 | { | |
793 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
794 | struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; | |
795 | int rc; | |
796 | ||
1b7029be DH |
797 | handle_last_fault(vcpu, vsie_page); |
798 | ||
a3508fbe DH |
799 | if (need_resched()) |
800 | schedule(); | |
801 | if (test_cpu_flag(CIF_MCCK_PENDING)) | |
802 | s390_handle_mcck(); | |
803 | ||
804 | srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); | |
805 | local_irq_disable(); | |
6edaa530 | 806 | guest_enter_irqoff(); |
a3508fbe DH |
807 | local_irq_enable(); |
808 | ||
809 | rc = sie64a(scb_s, vcpu->run->s.regs.gprs); | |
810 | ||
811 | local_irq_disable(); | |
6edaa530 | 812 | guest_exit_irqoff(); |
a3508fbe DH |
813 | local_irq_enable(); |
814 | vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); | |
815 | ||
d52cd207 QH |
816 | if (rc == -EINTR) { |
817 | VCPU_EVENT(vcpu, 3, "%s", "machine check"); | |
c95c8953 | 818 | kvm_s390_reinject_machine_check(vcpu, &vsie_page->mcck_info); |
d52cd207 QH |
819 | return 0; |
820 | } | |
821 | ||
a3508fbe DH |
822 | if (rc > 0) |
823 | rc = 0; /* we could still have an icpt */ | |
824 | else if (rc == -EFAULT) | |
825 | return handle_fault(vcpu, vsie_page); | |
826 | ||
827 | switch (scb_s->icptcode) { | |
66b630d5 DH |
828 | case ICPT_INST: |
829 | if (scb_s->ipa == 0xb2b0) | |
830 | rc = handle_stfle(vcpu, vsie_page); | |
831 | break; | |
a3508fbe DH |
832 | case ICPT_STOP: |
833 | /* stop not requested by g2 - must have been a kick */ | |
834 | if (!(atomic_read(&scb_o->cpuflags) & CPUSTAT_STOP_INT)) | |
835 | clear_vsie_icpt(vsie_page); | |
836 | break; | |
837 | case ICPT_VALIDITY: | |
838 | if ((scb_s->ipa & 0xf000) != 0xf000) | |
839 | scb_s->ipa += 0x1000; | |
840 | break; | |
841 | } | |
842 | return rc; | |
843 | } | |
844 | ||
845 | static void release_gmap_shadow(struct vsie_page *vsie_page) | |
846 | { | |
847 | if (vsie_page->gmap) | |
848 | gmap_put(vsie_page->gmap); | |
849 | WRITE_ONCE(vsie_page->gmap, NULL); | |
06d68a6c | 850 | prefix_unmapped(vsie_page); |
a3508fbe DH |
851 | } |
852 | ||
853 | static int acquire_gmap_shadow(struct kvm_vcpu *vcpu, | |
854 | struct vsie_page *vsie_page) | |
855 | { | |
856 | unsigned long asce; | |
857 | union ctlreg0 cr0; | |
858 | struct gmap *gmap; | |
859 | int edat; | |
860 | ||
861 | asce = vcpu->arch.sie_block->gcr[1]; | |
862 | cr0.val = vcpu->arch.sie_block->gcr[0]; | |
863 | edat = cr0.edat && test_kvm_facility(vcpu->kvm, 8); | |
864 | edat += edat && test_kvm_facility(vcpu->kvm, 78); | |
865 | ||
06d68a6c DH |
866 | /* |
867 | * ASCE or EDAT could have changed since last icpt, or the gmap | |
868 | * we're holding has been unshadowed. If the gmap is still valid, | |
869 | * we can safely reuse it. | |
870 | */ | |
871 | if (vsie_page->gmap && gmap_shadow_valid(vsie_page->gmap, asce, edat)) | |
872 | return 0; | |
873 | ||
874 | /* release the old shadow - if any, and mark the prefix as unmapped */ | |
875 | release_gmap_shadow(vsie_page); | |
a3508fbe DH |
876 | gmap = gmap_shadow(vcpu->arch.gmap, asce, edat); |
877 | if (IS_ERR(gmap)) | |
878 | return PTR_ERR(gmap); | |
879 | gmap->private = vcpu->kvm; | |
880 | WRITE_ONCE(vsie_page->gmap, gmap); | |
881 | return 0; | |
882 | } | |
883 | ||
adbf1698 DH |
884 | /* |
885 | * Register the shadow scb at the VCPU, e.g. for kicking out of vsie. | |
886 | */ | |
887 | static void register_shadow_scb(struct kvm_vcpu *vcpu, | |
888 | struct vsie_page *vsie_page) | |
889 | { | |
91473b48 DH |
890 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; |
891 | ||
adbf1698 | 892 | WRITE_ONCE(vcpu->arch.vsie_block, &vsie_page->scb_s); |
b917ae57 DH |
893 | /* |
894 | * External calls have to lead to a kick of the vcpu and | |
895 | * therefore the vsie -> Simulate Wait state. | |
896 | */ | |
897 | atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); | |
91473b48 DH |
898 | /* |
899 | * We have to adjust the g3 epoch by the g2 epoch. The epoch will | |
900 | * automatically be adjusted on tod clock changes via kvm_sync_clock. | |
901 | */ | |
902 | preempt_disable(); | |
903 | scb_s->epoch += vcpu->kvm->arch.epoch; | |
8fa1696e CW |
904 | |
905 | if (scb_s->ecd & ECD_MEF) { | |
906 | scb_s->epdx += vcpu->kvm->arch.epdx; | |
907 | if (scb_s->epoch < vcpu->kvm->arch.epoch) | |
908 | scb_s->epdx += 1; | |
909 | } | |
910 | ||
91473b48 | 911 | preempt_enable(); |
adbf1698 DH |
912 | } |
913 | ||
914 | /* | |
915 | * Unregister a shadow scb from a VCPU. | |
916 | */ | |
917 | static void unregister_shadow_scb(struct kvm_vcpu *vcpu) | |
918 | { | |
b917ae57 | 919 | atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); |
adbf1698 DH |
920 | WRITE_ONCE(vcpu->arch.vsie_block, NULL); |
921 | } | |
922 | ||
a3508fbe DH |
923 | /* |
924 | * Run the vsie on a shadowed scb, managing the gmap shadow, handling | |
925 | * prefix pages and faults. | |
926 | * | |
927 | * Returns: - 0 if no errors occurred | |
928 | * - > 0 if control has to be given to guest 2 | |
929 | * - -ENOMEM if out of memory | |
930 | */ | |
931 | static int vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) | |
932 | { | |
933 | struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; | |
934 | int rc = 0; | |
935 | ||
936 | while (1) { | |
937 | rc = acquire_gmap_shadow(vcpu, vsie_page); | |
938 | if (!rc) | |
939 | rc = map_prefix(vcpu, vsie_page); | |
940 | if (!rc) { | |
941 | gmap_enable(vsie_page->gmap); | |
942 | update_intervention_requests(vsie_page); | |
943 | rc = do_vsie_run(vcpu, vsie_page); | |
944 | gmap_enable(vcpu->arch.gmap); | |
945 | } | |
adbf1698 | 946 | atomic_andnot(PROG_BLOCK_SIE, &scb_s->prog20); |
a3508fbe DH |
947 | |
948 | if (rc == -EAGAIN) | |
949 | rc = 0; | |
950 | if (rc || scb_s->icptcode || signal_pending(current) || | |
951 | kvm_s390_vcpu_has_irq(vcpu, 0)) | |
952 | break; | |
0b925159 | 953 | } |
a3508fbe DH |
954 | |
955 | if (rc == -EFAULT) { | |
956 | /* | |
957 | * Addressing exceptions are always presentes as intercepts. | |
958 | * As addressing exceptions are suppressing and our guest 3 PSW | |
959 | * points at the responsible instruction, we have to | |
960 | * forward the PSW and set the ilc. If we can't read guest 3 | |
961 | * instruction, we can use an arbitrary ilc. Let's always use | |
962 | * ilen = 4 for now, so we can avoid reading in guest 3 virtual | |
963 | * memory. (we could also fake the shadow so the hardware | |
964 | * handles it). | |
965 | */ | |
966 | scb_s->icptcode = ICPT_PROGI; | |
967 | scb_s->iprcc = PGM_ADDRESSING; | |
968 | scb_s->pgmilc = 4; | |
969 | scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, 4); | |
970 | } | |
971 | return rc; | |
972 | } | |
973 | ||
974 | /* | |
975 | * Get or create a vsie page for a scb address. | |
976 | * | |
977 | * Returns: - address of a vsie page (cached or new one) | |
978 | * - NULL if the same scb address is already used by another VCPU | |
979 | * - ERR_PTR(-ENOMEM) if out of memory | |
980 | */ | |
981 | static struct vsie_page *get_vsie_page(struct kvm *kvm, unsigned long addr) | |
982 | { | |
983 | struct vsie_page *vsie_page; | |
984 | struct page *page; | |
985 | int nr_vcpus; | |
986 | ||
987 | rcu_read_lock(); | |
988 | page = radix_tree_lookup(&kvm->arch.vsie.addr_to_page, addr >> 9); | |
989 | rcu_read_unlock(); | |
990 | if (page) { | |
991 | if (page_ref_inc_return(page) == 2) | |
992 | return page_to_virt(page); | |
993 | page_ref_dec(page); | |
994 | } | |
995 | ||
996 | /* | |
997 | * We want at least #online_vcpus shadows, so every VCPU can execute | |
998 | * the VSIE in parallel. | |
999 | */ | |
1000 | nr_vcpus = atomic_read(&kvm->online_vcpus); | |
1001 | ||
1002 | mutex_lock(&kvm->arch.vsie.mutex); | |
1003 | if (kvm->arch.vsie.page_count < nr_vcpus) { | |
66b630d5 | 1004 | page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA); |
a3508fbe DH |
1005 | if (!page) { |
1006 | mutex_unlock(&kvm->arch.vsie.mutex); | |
1007 | return ERR_PTR(-ENOMEM); | |
1008 | } | |
1009 | page_ref_inc(page); | |
1010 | kvm->arch.vsie.pages[kvm->arch.vsie.page_count] = page; | |
1011 | kvm->arch.vsie.page_count++; | |
1012 | } else { | |
1013 | /* reuse an existing entry that belongs to nobody */ | |
1014 | while (true) { | |
1015 | page = kvm->arch.vsie.pages[kvm->arch.vsie.next]; | |
1016 | if (page_ref_inc_return(page) == 2) | |
1017 | break; | |
1018 | page_ref_dec(page); | |
1019 | kvm->arch.vsie.next++; | |
1020 | kvm->arch.vsie.next %= nr_vcpus; | |
1021 | } | |
1022 | radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9); | |
1023 | } | |
1024 | page->index = addr; | |
1025 | /* double use of the same address */ | |
1026 | if (radix_tree_insert(&kvm->arch.vsie.addr_to_page, addr >> 9, page)) { | |
1027 | page_ref_dec(page); | |
1028 | mutex_unlock(&kvm->arch.vsie.mutex); | |
1029 | return NULL; | |
1030 | } | |
1031 | mutex_unlock(&kvm->arch.vsie.mutex); | |
1032 | ||
1033 | vsie_page = page_to_virt(page); | |
1034 | memset(&vsie_page->scb_s, 0, sizeof(struct kvm_s390_sie_block)); | |
06d68a6c | 1035 | release_gmap_shadow(vsie_page); |
1b7029be | 1036 | vsie_page->fault_addr = 0; |
a3508fbe DH |
1037 | vsie_page->scb_s.ihcpu = 0xffffU; |
1038 | return vsie_page; | |
1039 | } | |
1040 | ||
1041 | /* put a vsie page acquired via get_vsie_page */ | |
1042 | static void put_vsie_page(struct kvm *kvm, struct vsie_page *vsie_page) | |
1043 | { | |
1044 | struct page *page = pfn_to_page(__pa(vsie_page) >> PAGE_SHIFT); | |
1045 | ||
1046 | page_ref_dec(page); | |
1047 | } | |
1048 | ||
1049 | int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu) | |
1050 | { | |
1051 | struct vsie_page *vsie_page; | |
1052 | unsigned long scb_addr; | |
1053 | int rc; | |
1054 | ||
1055 | vcpu->stat.instruction_sie++; | |
1056 | if (!test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIEF2)) | |
1057 | return -EOPNOTSUPP; | |
1058 | if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) | |
1059 | return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); | |
1060 | ||
58cdf5eb | 1061 | BUILD_BUG_ON(sizeof(struct vsie_page) != PAGE_SIZE); |
a3508fbe DH |
1062 | scb_addr = kvm_s390_get_base_disp_s(vcpu, NULL); |
1063 | ||
1064 | /* 512 byte alignment */ | |
1065 | if (unlikely(scb_addr & 0x1ffUL)) | |
1066 | return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); | |
1067 | ||
1068 | if (signal_pending(current) || kvm_s390_vcpu_has_irq(vcpu, 0)) | |
1069 | return 0; | |
1070 | ||
1071 | vsie_page = get_vsie_page(vcpu->kvm, scb_addr); | |
1072 | if (IS_ERR(vsie_page)) | |
1073 | return PTR_ERR(vsie_page); | |
1074 | else if (!vsie_page) | |
1075 | /* double use of sie control block - simply do nothing */ | |
1076 | return 0; | |
1077 | ||
1078 | rc = pin_scb(vcpu, vsie_page, scb_addr); | |
1079 | if (rc) | |
1080 | goto out_put; | |
1081 | rc = shadow_scb(vcpu, vsie_page); | |
1082 | if (rc) | |
1083 | goto out_unpin_scb; | |
1084 | rc = pin_blocks(vcpu, vsie_page); | |
1085 | if (rc) | |
1086 | goto out_unshadow; | |
adbf1698 | 1087 | register_shadow_scb(vcpu, vsie_page); |
a3508fbe | 1088 | rc = vsie_run(vcpu, vsie_page); |
adbf1698 | 1089 | unregister_shadow_scb(vcpu); |
a3508fbe DH |
1090 | unpin_blocks(vcpu, vsie_page); |
1091 | out_unshadow: | |
1092 | unshadow_scb(vcpu, vsie_page); | |
1093 | out_unpin_scb: | |
1094 | unpin_scb(vcpu, vsie_page, scb_addr); | |
1095 | out_put: | |
1096 | put_vsie_page(vcpu->kvm, vsie_page); | |
1097 | ||
1098 | return rc < 0 ? rc : 0; | |
1099 | } | |
1100 | ||
1101 | /* Init the vsie data structures. To be called when a vm is initialized. */ | |
1102 | void kvm_s390_vsie_init(struct kvm *kvm) | |
1103 | { | |
1104 | mutex_init(&kvm->arch.vsie.mutex); | |
1105 | INIT_RADIX_TREE(&kvm->arch.vsie.addr_to_page, GFP_KERNEL); | |
1106 | } | |
1107 | ||
1108 | /* Destroy the vsie data structures. To be called when a vm is destroyed. */ | |
1109 | void kvm_s390_vsie_destroy(struct kvm *kvm) | |
1110 | { | |
06d68a6c | 1111 | struct vsie_page *vsie_page; |
a3508fbe DH |
1112 | struct page *page; |
1113 | int i; | |
1114 | ||
1115 | mutex_lock(&kvm->arch.vsie.mutex); | |
1116 | for (i = 0; i < kvm->arch.vsie.page_count; i++) { | |
1117 | page = kvm->arch.vsie.pages[i]; | |
1118 | kvm->arch.vsie.pages[i] = NULL; | |
06d68a6c DH |
1119 | vsie_page = page_to_virt(page); |
1120 | release_gmap_shadow(vsie_page); | |
a3508fbe DH |
1121 | /* free the radix tree entry */ |
1122 | radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9); | |
1123 | __free_page(page); | |
1124 | } | |
1125 | kvm->arch.vsie.page_count = 0; | |
1126 | mutex_unlock(&kvm->arch.vsie.mutex); | |
1127 | } | |
adbf1698 DH |
1128 | |
1129 | void kvm_s390_vsie_kick(struct kvm_vcpu *vcpu) | |
1130 | { | |
1131 | struct kvm_s390_sie_block *scb = READ_ONCE(vcpu->arch.vsie_block); | |
1132 | ||
1133 | /* | |
1134 | * Even if the VCPU lets go of the shadow sie block reference, it is | |
1135 | * still valid in the cache. So we can safely kick it. | |
1136 | */ | |
1137 | if (scb) { | |
1138 | atomic_or(PROG_BLOCK_SIE, &scb->prog20); | |
1139 | if (scb->prog0c & PROG_IN_SIE) | |
1140 | atomic_or(CPUSTAT_STOP_INT, &scb->cpuflags); | |
1141 | } | |
1142 | } |