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Linux/arch/s390/kvm/vsie.c

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  1 /*
  2  * kvm nested virtualization support for s390x
  3  *
  4  * Copyright IBM Corp. 2016
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License (version 2 only)
  8  * as published by the Free Software Foundation.
  9  *
 10  *    Author(s): David Hildenbrand <dahi@linux.vnet.ibm.com>
 11  */
 12 #include <linux/vmalloc.h>
 13 #include <linux/kvm_host.h>
 14 #include <linux/bug.h>
 15 #include <linux/list.h>
 16 #include <linux/bitmap.h>
 17 #include <asm/gmap.h>
 18 #include <asm/mmu_context.h>
 19 #include <asm/sclp.h>
 20 #include <asm/nmi.h>
 21 #include <asm/dis.h>
 22 #include "kvm-s390.h"
 23 #include "gaccess.h"
 24 
 25 struct vsie_page {
 26         struct kvm_s390_sie_block scb_s;        /* 0x0000 */
 27         /* the pinned originial scb */
 28         struct kvm_s390_sie_block *scb_o;       /* 0x0200 */
 29         /* the shadow gmap in use by the vsie_page */
 30         struct gmap *gmap;                      /* 0x0208 */
 31         /* address of the last reported fault to guest2 */
 32         unsigned long fault_addr;               /* 0x0210 */
 33         __u8 reserved[0x0700 - 0x0218];         /* 0x0218 */
 34         struct kvm_s390_crypto_cb crycb;        /* 0x0700 */
 35         __u8 fac[S390_ARCH_FAC_LIST_SIZE_BYTE]; /* 0x0800 */
 36 } __packed;
 37 
 38 /* trigger a validity icpt for the given scb */
 39 static int set_validity_icpt(struct kvm_s390_sie_block *scb,
 40                              __u16 reason_code)
 41 {
 42         scb->ipa = 0x1000;
 43         scb->ipb = ((__u32) reason_code) << 16;
 44         scb->icptcode = ICPT_VALIDITY;
 45         return 1;
 46 }
 47 
 48 /* mark the prefix as unmapped, this will block the VSIE */
 49 static void prefix_unmapped(struct vsie_page *vsie_page)
 50 {
 51         atomic_or(PROG_REQUEST, &vsie_page->scb_s.prog20);
 52 }
 53 
 54 /* mark the prefix as unmapped and wait until the VSIE has been left */
 55 static void prefix_unmapped_sync(struct vsie_page *vsie_page)
 56 {
 57         prefix_unmapped(vsie_page);
 58         if (vsie_page->scb_s.prog0c & PROG_IN_SIE)
 59                 atomic_or(CPUSTAT_STOP_INT, &vsie_page->scb_s.cpuflags);
 60         while (vsie_page->scb_s.prog0c & PROG_IN_SIE)
 61                 cpu_relax();
 62 }
 63 
 64 /* mark the prefix as mapped, this will allow the VSIE to run */
 65 static void prefix_mapped(struct vsie_page *vsie_page)
 66 {
 67         atomic_andnot(PROG_REQUEST, &vsie_page->scb_s.prog20);
 68 }
 69 
 70 /* test if the prefix is mapped into the gmap shadow */
 71 static int prefix_is_mapped(struct vsie_page *vsie_page)
 72 {
 73         return !(atomic_read(&vsie_page->scb_s.prog20) & PROG_REQUEST);
 74 }
 75 
 76 /* copy the updated intervention request bits into the shadow scb */
 77 static void update_intervention_requests(struct vsie_page *vsie_page)
 78 {
 79         const int bits = CPUSTAT_STOP_INT | CPUSTAT_IO_INT | CPUSTAT_EXT_INT;
 80         int cpuflags;
 81 
 82         cpuflags = atomic_read(&vsie_page->scb_o->cpuflags);
 83         atomic_andnot(bits, &vsie_page->scb_s.cpuflags);
 84         atomic_or(cpuflags & bits, &vsie_page->scb_s.cpuflags);
 85 }
 86 
 87 /* shadow (filter and validate) the cpuflags  */
 88 static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
 89 {
 90         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
 91         struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
 92         int newflags, cpuflags = atomic_read(&scb_o->cpuflags);
 93 
 94         /* we don't allow ESA/390 guests */
 95         if (!(cpuflags & CPUSTAT_ZARCH))
 96                 return set_validity_icpt(scb_s, 0x0001U);
 97 
 98         if (cpuflags & (CPUSTAT_RRF | CPUSTAT_MCDS))
 99                 return set_validity_icpt(scb_s, 0x0001U);
100         else if (cpuflags & (CPUSTAT_SLSV | CPUSTAT_SLSR))
101                 return set_validity_icpt(scb_s, 0x0007U);
102 
103         /* intervention requests will be set later */
104         newflags = CPUSTAT_ZARCH;
105         if (cpuflags & CPUSTAT_GED && test_kvm_facility(vcpu->kvm, 8))
106                 newflags |= CPUSTAT_GED;
107         if (cpuflags & CPUSTAT_GED2 && test_kvm_facility(vcpu->kvm, 78)) {
108                 if (cpuflags & CPUSTAT_GED)
109                         return set_validity_icpt(scb_s, 0x0001U);
110                 newflags |= CPUSTAT_GED2;
111         }
112         if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GPERE))
113                 newflags |= cpuflags & CPUSTAT_P;
114         if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GSLS))
115                 newflags |= cpuflags & CPUSTAT_SM;
116         if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IBS))
117                 newflags |= cpuflags & CPUSTAT_IBS;
118 
119         atomic_set(&scb_s->cpuflags, newflags);
120         return 0;
121 }
122 
123 /*
124  * Create a shadow copy of the crycb block and setup key wrapping, if
125  * requested for guest 3 and enabled for guest 2.
126  *
127  * We only accept format-1 (no AP in g2), but convert it into format-2
128  * There is nothing to do for format-0.
129  *
130  * Returns: - 0 if shadowed or nothing to do
131  *          - > 0 if control has to be given to guest 2
132  */
133 static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
134 {
135         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
136         struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
137         u32 crycb_addr = scb_o->crycbd & 0x7ffffff8U;
138         unsigned long *b1, *b2;
139         u8 ecb3_flags;
140 
141         scb_s->crycbd = 0;
142         if (!(scb_o->crycbd & vcpu->arch.sie_block->crycbd & CRYCB_FORMAT1))
143                 return 0;
144         /* format-1 is supported with message-security-assist extension 3 */
145         if (!test_kvm_facility(vcpu->kvm, 76))
146                 return 0;
147         /* we may only allow it if enabled for guest 2 */
148         ecb3_flags = scb_o->ecb3 & vcpu->arch.sie_block->ecb3 &
149                      (ECB3_AES | ECB3_DEA);
150         if (!ecb3_flags)
151                 return 0;
152 
153         if ((crycb_addr & PAGE_MASK) != ((crycb_addr + 128) & PAGE_MASK))
154                 return set_validity_icpt(scb_s, 0x003CU);
155         else if (!crycb_addr)
156                 return set_validity_icpt(scb_s, 0x0039U);
157 
158         /* copy only the wrapping keys */
159         if (read_guest_real(vcpu, crycb_addr + 72, &vsie_page->crycb, 56))
160                 return set_validity_icpt(scb_s, 0x0035U);
161 
162         scb_s->ecb3 |= ecb3_flags;
163         scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | CRYCB_FORMAT1 |
164                         CRYCB_FORMAT2;
165 
166         /* xor both blocks in one run */
167         b1 = (unsigned long *) vsie_page->crycb.dea_wrapping_key_mask;
168         b2 = (unsigned long *)
169                             vcpu->kvm->arch.crypto.crycb->dea_wrapping_key_mask;
170         /* as 56%8 == 0, bitmap_xor won't overwrite any data */
171         bitmap_xor(b1, b1, b2, BITS_PER_BYTE * 56);
172         return 0;
173 }
174 
175 /* shadow (round up/down) the ibc to avoid validity icpt */
176 static void prepare_ibc(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
177 {
178         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
179         struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
180         __u64 min_ibc = (sclp.ibc >> 16) & 0x0fffU;
181 
182         scb_s->ibc = 0;
183         /* ibc installed in g2 and requested for g3 */
184         if (vcpu->kvm->arch.model.ibc && (scb_o->ibc & 0x0fffU)) {
185                 scb_s->ibc = scb_o->ibc & 0x0fffU;
186                 /* takte care of the minimum ibc level of the machine */
187                 if (scb_s->ibc < min_ibc)
188                         scb_s->ibc = min_ibc;
189                 /* take care of the maximum ibc level set for the guest */
190                 if (scb_s->ibc > vcpu->kvm->arch.model.ibc)
191                         scb_s->ibc = vcpu->kvm->arch.model.ibc;
192         }
193 }
194 
195 /* unshadow the scb, copying parameters back to the real scb */
196 static void unshadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
197 {
198         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
199         struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
200 
201         /* interception */
202         scb_o->icptcode = scb_s->icptcode;
203         scb_o->icptstatus = scb_s->icptstatus;
204         scb_o->ipa = scb_s->ipa;
205         scb_o->ipb = scb_s->ipb;
206         scb_o->gbea = scb_s->gbea;
207 
208         /* timer */
209         scb_o->cputm = scb_s->cputm;
210         scb_o->ckc = scb_s->ckc;
211         scb_o->todpr = scb_s->todpr;
212 
213         /* guest state */
214         scb_o->gpsw = scb_s->gpsw;
215         scb_o->gg14 = scb_s->gg14;
216         scb_o->gg15 = scb_s->gg15;
217         memcpy(scb_o->gcr, scb_s->gcr, 128);
218         scb_o->pp = scb_s->pp;
219 
220         /* interrupt intercept */
221         switch (scb_s->icptcode) {
222         case ICPT_PROGI:
223         case ICPT_INSTPROGI:
224         case ICPT_EXTINT:
225                 memcpy((void *)((u64)scb_o + 0xc0),
226                        (void *)((u64)scb_s + 0xc0), 0xf0 - 0xc0);
227                 break;
228         case ICPT_PARTEXEC:
229                 /* MVPG only */
230                 memcpy((void *)((u64)scb_o + 0xc0),
231                        (void *)((u64)scb_s + 0xc0), 0xd0 - 0xc0);
232                 break;
233         }
234 
235         if (scb_s->ihcpu != 0xffffU)
236                 scb_o->ihcpu = scb_s->ihcpu;
237 }
238 
239 /*
240  * Setup the shadow scb by copying and checking the relevant parts of the g2
241  * provided scb.
242  *
243  * Returns: - 0 if the scb has been shadowed
244  *          - > 0 if control has to be given to guest 2
245  */
246 static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
247 {
248         struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
249         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
250         bool had_tx = scb_s->ecb & 0x10U;
251         unsigned long new_mso = 0;
252         int rc;
253 
254         /* make sure we don't have any leftovers when reusing the scb */
255         scb_s->icptcode = 0;
256         scb_s->eca = 0;
257         scb_s->ecb = 0;
258         scb_s->ecb2 = 0;
259         scb_s->ecb3 = 0;
260         scb_s->ecd = 0;
261         scb_s->fac = 0;
262 
263         rc = prepare_cpuflags(vcpu, vsie_page);
264         if (rc)
265                 goto out;
266 
267         /* timer */
268         scb_s->cputm = scb_o->cputm;
269         scb_s->ckc = scb_o->ckc;
270         scb_s->todpr = scb_o->todpr;
271         scb_s->epoch = scb_o->epoch;
272 
273         /* guest state */
274         scb_s->gpsw = scb_o->gpsw;
275         scb_s->gg14 = scb_o->gg14;
276         scb_s->gg15 = scb_o->gg15;
277         memcpy(scb_s->gcr, scb_o->gcr, 128);
278         scb_s->pp = scb_o->pp;
279 
280         /* interception / execution handling */
281         scb_s->gbea = scb_o->gbea;
282         scb_s->lctl = scb_o->lctl;
283         scb_s->svcc = scb_o->svcc;
284         scb_s->ictl = scb_o->ictl;
285         /*
286          * SKEY handling functions can't deal with false setting of PTE invalid
287          * bits. Therefore we cannot provide interpretation and would later
288          * have to provide own emulation handlers.
289          */
290         scb_s->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
291         scb_s->icpua = scb_o->icpua;
292 
293         if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_SM))
294                 new_mso = scb_o->mso & 0xfffffffffff00000UL;
295         /* if the hva of the prefix changes, we have to remap the prefix */
296         if (scb_s->mso != new_mso || scb_s->prefix != scb_o->prefix)
297                 prefix_unmapped(vsie_page);
298          /* SIE will do mso/msl validity and exception checks for us */
299         scb_s->msl = scb_o->msl & 0xfffffffffff00000UL;
300         scb_s->mso = new_mso;
301         scb_s->prefix = scb_o->prefix;
302 
303         /* We have to definetly flush the tlb if this scb never ran */
304         if (scb_s->ihcpu != 0xffffU)
305                 scb_s->ihcpu = scb_o->ihcpu;
306 
307         /* MVPG and Protection Exception Interpretation are always available */
308         scb_s->eca |= scb_o->eca & 0x01002000U;
309         /* Host-protection-interruption introduced with ESOP */
310         if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_ESOP))
311                 scb_s->ecb |= scb_o->ecb & 0x02U;
312         /* transactional execution */
313         if (test_kvm_facility(vcpu->kvm, 73)) {
314                 /* remap the prefix is tx is toggled on */
315                 if ((scb_o->ecb & 0x10U) && !had_tx)
316                         prefix_unmapped(vsie_page);
317                 scb_s->ecb |= scb_o->ecb & 0x10U;
318         }
319         /* SIMD */
320         if (test_kvm_facility(vcpu->kvm, 129)) {
321                 scb_s->eca |= scb_o->eca & 0x00020000U;
322                 scb_s->ecd |= scb_o->ecd & 0x20000000U;
323         }
324         /* Run-time-Instrumentation */
325         if (test_kvm_facility(vcpu->kvm, 64))
326                 scb_s->ecb3 |= scb_o->ecb3 & 0x01U;
327         if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIIF))
328                 scb_s->eca |= scb_o->eca & 0x00000001U;
329         if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IB))
330                 scb_s->eca |= scb_o->eca & 0x40000000U;
331         if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_CEI))
332                 scb_s->eca |= scb_o->eca & 0x80000000U;
333 
334         prepare_ibc(vcpu, vsie_page);
335         rc = shadow_crycb(vcpu, vsie_page);
336 out:
337         if (rc)
338                 unshadow_scb(vcpu, vsie_page);
339         return rc;
340 }
341 
342 void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start,
343                                  unsigned long end)
344 {
345         struct kvm *kvm = gmap->private;
346         struct vsie_page *cur;
347         unsigned long prefix;
348         struct page *page;
349         int i;
350 
351         if (!gmap_is_shadow(gmap))
352                 return;
353         if (start >= 1UL << 31)
354                 /* We are only interested in prefix pages */
355                 return;
356 
357         /*
358          * Only new shadow blocks are added to the list during runtime,
359          * therefore we can safely reference them all the time.
360          */
361         for (i = 0; i < kvm->arch.vsie.page_count; i++) {
362                 page = READ_ONCE(kvm->arch.vsie.pages[i]);
363                 if (!page)
364                         continue;
365                 cur = page_to_virt(page);
366                 if (READ_ONCE(cur->gmap) != gmap)
367                         continue;
368                 prefix = cur->scb_s.prefix << GUEST_PREFIX_SHIFT;
369                 /* with mso/msl, the prefix lies at an offset */
370                 prefix += cur->scb_s.mso;
371                 if (prefix <= end && start <= prefix + 2 * PAGE_SIZE - 1)
372                         prefix_unmapped_sync(cur);
373         }
374 }
375 
376 /*
377  * Map the first prefix page and if tx is enabled also the second prefix page.
378  *
379  * The prefix will be protected, a gmap notifier will inform about unmaps.
380  * The shadow scb must not be executed until the prefix is remapped, this is
381  * guaranteed by properly handling PROG_REQUEST.
382  *
383  * Returns: - 0 on if successfully mapped or already mapped
384  *          - > 0 if control has to be given to guest 2
385  *          - -EAGAIN if the caller can retry immediately
386  *          - -ENOMEM if out of memory
387  */
388 static int map_prefix(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
389 {
390         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
391         u64 prefix = scb_s->prefix << GUEST_PREFIX_SHIFT;
392         int rc;
393 
394         if (prefix_is_mapped(vsie_page))
395                 return 0;
396 
397         /* mark it as mapped so we can catch any concurrent unmappers */
398         prefix_mapped(vsie_page);
399 
400         /* with mso/msl, the prefix lies at offset *mso* */
401         prefix += scb_s->mso;
402 
403         rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, prefix);
404         if (!rc && (scb_s->ecb & 0x10U))
405                 rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap,
406                                            prefix + PAGE_SIZE);
407         /*
408          * We don't have to mprotect, we will be called for all unshadows.
409          * SIE will detect if protection applies and trigger a validity.
410          */
411         if (rc)
412                 prefix_unmapped(vsie_page);
413         if (rc > 0 || rc == -EFAULT)
414                 rc = set_validity_icpt(scb_s, 0x0037U);
415         return rc;
416 }
417 
418 /*
419  * Pin the guest page given by gpa and set hpa to the pinned host address.
420  * Will always be pinned writable.
421  *
422  * Returns: - 0 on success
423  *          - -EINVAL if the gpa is not valid guest storage
424  *          - -ENOMEM if out of memory
425  */
426 static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa)
427 {
428         struct page *page;
429         hva_t hva;
430         int rc;
431 
432         hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));
433         if (kvm_is_error_hva(hva))
434                 return -EINVAL;
435         rc = get_user_pages_fast(hva, 1, 1, &page);
436         if (rc < 0)
437                 return rc;
438         else if (rc != 1)
439                 return -ENOMEM;
440         *hpa = (hpa_t) page_to_virt(page) + (gpa & ~PAGE_MASK);
441         return 0;
442 }
443 
444 /* Unpins a page previously pinned via pin_guest_page, marking it as dirty. */
445 static void unpin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t hpa)
446 {
447         struct page *page;
448 
449         page = virt_to_page(hpa);
450         set_page_dirty_lock(page);
451         put_page(page);
452         /* mark the page always as dirty for migration */
453         mark_page_dirty(kvm, gpa_to_gfn(gpa));
454 }
455 
456 /* unpin all blocks previously pinned by pin_blocks(), marking them dirty */
457 static void unpin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
458 {
459         struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
460         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
461         hpa_t hpa;
462         gpa_t gpa;
463 
464         hpa = (u64) scb_s->scaoh << 32 | scb_s->scaol;
465         if (hpa) {
466                 gpa = scb_o->scaol & ~0xfUL;
467                 if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO))
468                         gpa |= (u64) scb_o->scaoh << 32;
469                 unpin_guest_page(vcpu->kvm, gpa, hpa);
470                 scb_s->scaol = 0;
471                 scb_s->scaoh = 0;
472         }
473 
474         hpa = scb_s->itdba;
475         if (hpa) {
476                 gpa = scb_o->itdba & ~0xffUL;
477                 unpin_guest_page(vcpu->kvm, gpa, hpa);
478                 scb_s->itdba = 0;
479         }
480 
481         hpa = scb_s->gvrd;
482         if (hpa) {
483                 gpa = scb_o->gvrd & ~0x1ffUL;
484                 unpin_guest_page(vcpu->kvm, gpa, hpa);
485                 scb_s->gvrd = 0;
486         }
487 
488         hpa = scb_s->riccbd;
489         if (hpa) {
490                 gpa = scb_o->riccbd & ~0x3fUL;
491                 unpin_guest_page(vcpu->kvm, gpa, hpa);
492                 scb_s->riccbd = 0;
493         }
494 }
495 
496 /*
497  * Instead of shadowing some blocks, we can simply forward them because the
498  * addresses in the scb are 64 bit long.
499  *
500  * This works as long as the data lies in one page. If blocks ever exceed one
501  * page, we have to fall back to shadowing.
502  *
503  * As we reuse the sca, the vcpu pointers contained in it are invalid. We must
504  * therefore not enable any facilities that access these pointers (e.g. SIGPIF).
505  *
506  * Returns: - 0 if all blocks were pinned.
507  *          - > 0 if control has to be given to guest 2
508  *          - -ENOMEM if out of memory
509  */
510 static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
511 {
512         struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
513         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
514         hpa_t hpa;
515         gpa_t gpa;
516         int rc = 0;
517 
518         gpa = scb_o->scaol & ~0xfUL;
519         if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO))
520                 gpa |= (u64) scb_o->scaoh << 32;
521         if (gpa) {
522                 if (!(gpa & ~0x1fffUL))
523                         rc = set_validity_icpt(scb_s, 0x0038U);
524                 else if ((gpa & ~0x1fffUL) == kvm_s390_get_prefix(vcpu))
525                         rc = set_validity_icpt(scb_s, 0x0011U);
526                 else if ((gpa & PAGE_MASK) !=
527                          ((gpa + sizeof(struct bsca_block) - 1) & PAGE_MASK))
528                         rc = set_validity_icpt(scb_s, 0x003bU);
529                 if (!rc) {
530                         rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
531                         if (rc == -EINVAL)
532                                 rc = set_validity_icpt(scb_s, 0x0034U);
533                 }
534                 if (rc)
535                         goto unpin;
536                 scb_s->scaoh = (u32)((u64)hpa >> 32);
537                 scb_s->scaol = (u32)(u64)hpa;
538         }
539 
540         gpa = scb_o->itdba & ~0xffUL;
541         if (gpa && (scb_s->ecb & 0x10U)) {
542                 if (!(gpa & ~0x1fffU)) {
543                         rc = set_validity_icpt(scb_s, 0x0080U);
544                         goto unpin;
545                 }
546                 /* 256 bytes cannot cross page boundaries */
547                 rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
548                 if (rc == -EINVAL)
549                         rc = set_validity_icpt(scb_s, 0x0080U);
550                 if (rc)
551                         goto unpin;
552                 scb_s->itdba = hpa;
553         }
554 
555         gpa = scb_o->gvrd & ~0x1ffUL;
556         if (gpa && (scb_s->eca & 0x00020000U) &&
557             !(scb_s->ecd & 0x20000000U)) {
558                 if (!(gpa & ~0x1fffUL)) {
559                         rc = set_validity_icpt(scb_s, 0x1310U);
560                         goto unpin;
561                 }
562                 /*
563                  * 512 bytes vector registers cannot cross page boundaries
564                  * if this block gets bigger, we have to shadow it.
565                  */
566                 rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
567                 if (rc == -EINVAL)
568                         rc = set_validity_icpt(scb_s, 0x1310U);
569                 if (rc)
570                         goto unpin;
571                 scb_s->gvrd = hpa;
572         }
573 
574         gpa = scb_o->riccbd & ~0x3fUL;
575         if (gpa && (scb_s->ecb3 & 0x01U)) {
576                 if (!(gpa & ~0x1fffUL)) {
577                         rc = set_validity_icpt(scb_s, 0x0043U);
578                         goto unpin;
579                 }
580                 /* 64 bytes cannot cross page boundaries */
581                 rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
582                 if (rc == -EINVAL)
583                         rc = set_validity_icpt(scb_s, 0x0043U);
584                 /* Validity 0x0044 will be checked by SIE */
585                 if (rc)
586                         goto unpin;
587                 scb_s->riccbd = hpa;
588         }
589         return 0;
590 unpin:
591         unpin_blocks(vcpu, vsie_page);
592         return rc;
593 }
594 
595 /* unpin the scb provided by guest 2, marking it as dirty */
596 static void unpin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page,
597                       gpa_t gpa)
598 {
599         hpa_t hpa = (hpa_t) vsie_page->scb_o;
600 
601         if (hpa)
602                 unpin_guest_page(vcpu->kvm, gpa, hpa);
603         vsie_page->scb_o = NULL;
604 }
605 
606 /*
607  * Pin the scb at gpa provided by guest 2 at vsie_page->scb_o.
608  *
609  * Returns: - 0 if the scb was pinned.
610  *          - > 0 if control has to be given to guest 2
611  *          - -ENOMEM if out of memory
612  */
613 static int pin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page,
614                    gpa_t gpa)
615 {
616         hpa_t hpa;
617         int rc;
618 
619         rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
620         if (rc == -EINVAL) {
621                 rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
622                 if (!rc)
623                         rc = 1;
624         }
625         if (!rc)
626                 vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa;
627         return rc;
628 }
629 
630 /*
631  * Inject a fault into guest 2.
632  *
633  * Returns: - > 0 if control has to be given to guest 2
634  *            < 0 if an error occurred during injection.
635  */
636 static int inject_fault(struct kvm_vcpu *vcpu, __u16 code, __u64 vaddr,
637                         bool write_flag)
638 {
639         struct kvm_s390_pgm_info pgm = {
640                 .code = code,
641                 .trans_exc_code =
642                         /* 0-51: virtual address */
643                         (vaddr & 0xfffffffffffff000UL) |
644                         /* 52-53: store / fetch */
645                         (((unsigned int) !write_flag) + 1) << 10,
646                         /* 62-63: asce id (alway primary == 0) */
647                 .exc_access_id = 0, /* always primary */
648                 .op_access_id = 0, /* not MVPG */
649         };
650         int rc;
651 
652         if (code == PGM_PROTECTION)
653                 pgm.trans_exc_code |= 0x4UL;
654 
655         rc = kvm_s390_inject_prog_irq(vcpu, &pgm);
656         return rc ? rc : 1;
657 }
658 
659 /*
660  * Handle a fault during vsie execution on a gmap shadow.
661  *
662  * Returns: - 0 if the fault was resolved
663  *          - > 0 if control has to be given to guest 2
664  *          - < 0 if an error occurred
665  */
666 static int handle_fault(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
667 {
668         int rc;
669 
670         if (current->thread.gmap_int_code == PGM_PROTECTION)
671                 /* we can directly forward all protection exceptions */
672                 return inject_fault(vcpu, PGM_PROTECTION,
673                                     current->thread.gmap_addr, 1);
674 
675         rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap,
676                                    current->thread.gmap_addr);
677         if (rc > 0) {
678                 rc = inject_fault(vcpu, rc,
679                                   current->thread.gmap_addr,
680                                   current->thread.gmap_write_flag);
681                 if (rc >= 0)
682                         vsie_page->fault_addr = current->thread.gmap_addr;
683         }
684         return rc;
685 }
686 
687 /*
688  * Retry the previous fault that required guest 2 intervention. This avoids
689  * one superfluous SIE re-entry and direct exit.
690  *
691  * Will ignore any errors. The next SIE fault will do proper fault handling.
692  */
693 static void handle_last_fault(struct kvm_vcpu *vcpu,
694                               struct vsie_page *vsie_page)
695 {
696         if (vsie_page->fault_addr)
697                 kvm_s390_shadow_fault(vcpu, vsie_page->gmap,
698                                       vsie_page->fault_addr);
699         vsie_page->fault_addr = 0;
700 }
701 
702 static inline void clear_vsie_icpt(struct vsie_page *vsie_page)
703 {
704         vsie_page->scb_s.icptcode = 0;
705 }
706 
707 /* rewind the psw and clear the vsie icpt, so we can retry execution */
708 static void retry_vsie_icpt(struct vsie_page *vsie_page)
709 {
710         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
711         int ilen = insn_length(scb_s->ipa >> 8);
712 
713         /* take care of EXECUTE instructions */
714         if (scb_s->icptstatus & 1) {
715                 ilen = (scb_s->icptstatus >> 4) & 0x6;
716                 if (!ilen)
717                         ilen = 4;
718         }
719         scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, ilen);
720         clear_vsie_icpt(vsie_page);
721 }
722 
723 /*
724  * Try to shadow + enable the guest 2 provided facility list.
725  * Retry instruction execution if enabled for and provided by guest 2.
726  *
727  * Returns: - 0 if handled (retry or guest 2 icpt)
728  *          - > 0 if control has to be given to guest 2
729  */
730 static int handle_stfle(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
731 {
732         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
733         __u32 fac = vsie_page->scb_o->fac & 0x7ffffff8U;
734 
735         if (fac && test_kvm_facility(vcpu->kvm, 7)) {
736                 retry_vsie_icpt(vsie_page);
737                 if (read_guest_real(vcpu, fac, &vsie_page->fac,
738                                     sizeof(vsie_page->fac)))
739                         return set_validity_icpt(scb_s, 0x1090U);
740                 scb_s->fac = (__u32)(__u64) &vsie_page->fac;
741         }
742         return 0;
743 }
744 
745 /*
746  * Run the vsie on a shadow scb and a shadow gmap, without any further
747  * sanity checks, handling SIE faults.
748  *
749  * Returns: - 0 everything went fine
750  *          - > 0 if control has to be given to guest 2
751  *          - < 0 if an error occurred
752  */
753 static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
754 {
755         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
756         struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
757         int rc;
758 
759         handle_last_fault(vcpu, vsie_page);
760 
761         if (need_resched())
762                 schedule();
763         if (test_cpu_flag(CIF_MCCK_PENDING))
764                 s390_handle_mcck();
765 
766         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
767         local_irq_disable();
768         guest_enter_irqoff();
769         local_irq_enable();
770 
771         rc = sie64a(scb_s, vcpu->run->s.regs.gprs);
772 
773         local_irq_disable();
774         guest_exit_irqoff();
775         local_irq_enable();
776         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
777 
778         if (rc > 0)
779                 rc = 0; /* we could still have an icpt */
780         else if (rc == -EFAULT)
781                 return handle_fault(vcpu, vsie_page);
782 
783         switch (scb_s->icptcode) {
784         case ICPT_INST:
785                 if (scb_s->ipa == 0xb2b0)
786                         rc = handle_stfle(vcpu, vsie_page);
787                 break;
788         case ICPT_STOP:
789                 /* stop not requested by g2 - must have been a kick */
790                 if (!(atomic_read(&scb_o->cpuflags) & CPUSTAT_STOP_INT))
791                         clear_vsie_icpt(vsie_page);
792                 break;
793         case ICPT_VALIDITY:
794                 if ((scb_s->ipa & 0xf000) != 0xf000)
795                         scb_s->ipa += 0x1000;
796                 break;
797         }
798         return rc;
799 }
800 
801 static void release_gmap_shadow(struct vsie_page *vsie_page)
802 {
803         if (vsie_page->gmap)
804                 gmap_put(vsie_page->gmap);
805         WRITE_ONCE(vsie_page->gmap, NULL);
806         prefix_unmapped(vsie_page);
807 }
808 
809 static int acquire_gmap_shadow(struct kvm_vcpu *vcpu,
810                                struct vsie_page *vsie_page)
811 {
812         unsigned long asce;
813         union ctlreg0 cr0;
814         struct gmap *gmap;
815         int edat;
816 
817         asce = vcpu->arch.sie_block->gcr[1];
818         cr0.val = vcpu->arch.sie_block->gcr[0];
819         edat = cr0.edat && test_kvm_facility(vcpu->kvm, 8);
820         edat += edat && test_kvm_facility(vcpu->kvm, 78);
821 
822         /*
823          * ASCE or EDAT could have changed since last icpt, or the gmap
824          * we're holding has been unshadowed. If the gmap is still valid,
825          * we can safely reuse it.
826          */
827         if (vsie_page->gmap && gmap_shadow_valid(vsie_page->gmap, asce, edat))
828                 return 0;
829 
830         /* release the old shadow - if any, and mark the prefix as unmapped */
831         release_gmap_shadow(vsie_page);
832         gmap = gmap_shadow(vcpu->arch.gmap, asce, edat);
833         if (IS_ERR(gmap))
834                 return PTR_ERR(gmap);
835         gmap->private = vcpu->kvm;
836         WRITE_ONCE(vsie_page->gmap, gmap);
837         return 0;
838 }
839 
840 /*
841  * Register the shadow scb at the VCPU, e.g. for kicking out of vsie.
842  */
843 static void register_shadow_scb(struct kvm_vcpu *vcpu,
844                                 struct vsie_page *vsie_page)
845 {
846         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
847 
848         WRITE_ONCE(vcpu->arch.vsie_block, &vsie_page->scb_s);
849         /*
850          * External calls have to lead to a kick of the vcpu and
851          * therefore the vsie -> Simulate Wait state.
852          */
853         atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
854         /*
855          * We have to adjust the g3 epoch by the g2 epoch. The epoch will
856          * automatically be adjusted on tod clock changes via kvm_sync_clock.
857          */
858         preempt_disable();
859         scb_s->epoch += vcpu->kvm->arch.epoch;
860         preempt_enable();
861 }
862 
863 /*
864  * Unregister a shadow scb from a VCPU.
865  */
866 static void unregister_shadow_scb(struct kvm_vcpu *vcpu)
867 {
868         atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
869         WRITE_ONCE(vcpu->arch.vsie_block, NULL);
870 }
871 
872 /*
873  * Run the vsie on a shadowed scb, managing the gmap shadow, handling
874  * prefix pages and faults.
875  *
876  * Returns: - 0 if no errors occurred
877  *          - > 0 if control has to be given to guest 2
878  *          - -ENOMEM if out of memory
879  */
880 static int vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
881 {
882         struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
883         int rc = 0;
884 
885         while (1) {
886                 rc = acquire_gmap_shadow(vcpu, vsie_page);
887                 if (!rc)
888                         rc = map_prefix(vcpu, vsie_page);
889                 if (!rc) {
890                         gmap_enable(vsie_page->gmap);
891                         update_intervention_requests(vsie_page);
892                         rc = do_vsie_run(vcpu, vsie_page);
893                         gmap_enable(vcpu->arch.gmap);
894                 }
895                 atomic_andnot(PROG_BLOCK_SIE, &scb_s->prog20);
896 
897                 if (rc == -EAGAIN)
898                         rc = 0;
899                 if (rc || scb_s->icptcode || signal_pending(current) ||
900                     kvm_s390_vcpu_has_irq(vcpu, 0))
901                         break;
902         };
903 
904         if (rc == -EFAULT) {
905                 /*
906                  * Addressing exceptions are always presentes as intercepts.
907                  * As addressing exceptions are suppressing and our guest 3 PSW
908                  * points at the responsible instruction, we have to
909                  * forward the PSW and set the ilc. If we can't read guest 3
910                  * instruction, we can use an arbitrary ilc. Let's always use
911                  * ilen = 4 for now, so we can avoid reading in guest 3 virtual
912                  * memory. (we could also fake the shadow so the hardware
913                  * handles it).
914                  */
915                 scb_s->icptcode = ICPT_PROGI;
916                 scb_s->iprcc = PGM_ADDRESSING;
917                 scb_s->pgmilc = 4;
918                 scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, 4);
919         }
920         return rc;
921 }
922 
923 /*
924  * Get or create a vsie page for a scb address.
925  *
926  * Returns: - address of a vsie page (cached or new one)
927  *          - NULL if the same scb address is already used by another VCPU
928  *          - ERR_PTR(-ENOMEM) if out of memory
929  */
930 static struct vsie_page *get_vsie_page(struct kvm *kvm, unsigned long addr)
931 {
932         struct vsie_page *vsie_page;
933         struct page *page;
934         int nr_vcpus;
935 
936         rcu_read_lock();
937         page = radix_tree_lookup(&kvm->arch.vsie.addr_to_page, addr >> 9);
938         rcu_read_unlock();
939         if (page) {
940                 if (page_ref_inc_return(page) == 2)
941                         return page_to_virt(page);
942                 page_ref_dec(page);
943         }
944 
945         /*
946          * We want at least #online_vcpus shadows, so every VCPU can execute
947          * the VSIE in parallel.
948          */
949         nr_vcpus = atomic_read(&kvm->online_vcpus);
950 
951         mutex_lock(&kvm->arch.vsie.mutex);
952         if (kvm->arch.vsie.page_count < nr_vcpus) {
953                 page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA);
954                 if (!page) {
955                         mutex_unlock(&kvm->arch.vsie.mutex);
956                         return ERR_PTR(-ENOMEM);
957                 }
958                 page_ref_inc(page);
959                 kvm->arch.vsie.pages[kvm->arch.vsie.page_count] = page;
960                 kvm->arch.vsie.page_count++;
961         } else {
962                 /* reuse an existing entry that belongs to nobody */
963                 while (true) {
964                         page = kvm->arch.vsie.pages[kvm->arch.vsie.next];
965                         if (page_ref_inc_return(page) == 2)
966                                 break;
967                         page_ref_dec(page);
968                         kvm->arch.vsie.next++;
969                         kvm->arch.vsie.next %= nr_vcpus;
970                 }
971                 radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9);
972         }
973         page->index = addr;
974         /* double use of the same address */
975         if (radix_tree_insert(&kvm->arch.vsie.addr_to_page, addr >> 9, page)) {
976                 page_ref_dec(page);
977                 mutex_unlock(&kvm->arch.vsie.mutex);
978                 return NULL;
979         }
980         mutex_unlock(&kvm->arch.vsie.mutex);
981 
982         vsie_page = page_to_virt(page);
983         memset(&vsie_page->scb_s, 0, sizeof(struct kvm_s390_sie_block));
984         release_gmap_shadow(vsie_page);
985         vsie_page->fault_addr = 0;
986         vsie_page->scb_s.ihcpu = 0xffffU;
987         return vsie_page;
988 }
989 
990 /* put a vsie page acquired via get_vsie_page */
991 static void put_vsie_page(struct kvm *kvm, struct vsie_page *vsie_page)
992 {
993         struct page *page = pfn_to_page(__pa(vsie_page) >> PAGE_SHIFT);
994 
995         page_ref_dec(page);
996 }
997 
998 int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu)
999 {
1000         struct vsie_page *vsie_page;
1001         unsigned long scb_addr;
1002         int rc;
1003 
1004         vcpu->stat.instruction_sie++;
1005         if (!test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIEF2))
1006                 return -EOPNOTSUPP;
1007         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1008                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1009 
1010         BUILD_BUG_ON(sizeof(struct vsie_page) != 4096);
1011         scb_addr = kvm_s390_get_base_disp_s(vcpu, NULL);
1012 
1013         /* 512 byte alignment */
1014         if (unlikely(scb_addr & 0x1ffUL))
1015                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1016 
1017         if (signal_pending(current) || kvm_s390_vcpu_has_irq(vcpu, 0))
1018                 return 0;
1019 
1020         vsie_page = get_vsie_page(vcpu->kvm, scb_addr);
1021         if (IS_ERR(vsie_page))
1022                 return PTR_ERR(vsie_page);
1023         else if (!vsie_page)
1024                 /* double use of sie control block - simply do nothing */
1025                 return 0;
1026 
1027         rc = pin_scb(vcpu, vsie_page, scb_addr);
1028         if (rc)
1029                 goto out_put;
1030         rc = shadow_scb(vcpu, vsie_page);
1031         if (rc)
1032                 goto out_unpin_scb;
1033         rc = pin_blocks(vcpu, vsie_page);
1034         if (rc)
1035                 goto out_unshadow;
1036         register_shadow_scb(vcpu, vsie_page);
1037         rc = vsie_run(vcpu, vsie_page);
1038         unregister_shadow_scb(vcpu);
1039         unpin_blocks(vcpu, vsie_page);
1040 out_unshadow:
1041         unshadow_scb(vcpu, vsie_page);
1042 out_unpin_scb:
1043         unpin_scb(vcpu, vsie_page, scb_addr);
1044 out_put:
1045         put_vsie_page(vcpu->kvm, vsie_page);
1046 
1047         return rc < 0 ? rc : 0;
1048 }
1049 
1050 /* Init the vsie data structures. To be called when a vm is initialized. */
1051 void kvm_s390_vsie_init(struct kvm *kvm)
1052 {
1053         mutex_init(&kvm->arch.vsie.mutex);
1054         INIT_RADIX_TREE(&kvm->arch.vsie.addr_to_page, GFP_KERNEL);
1055 }
1056 
1057 /* Destroy the vsie data structures. To be called when a vm is destroyed. */
1058 void kvm_s390_vsie_destroy(struct kvm *kvm)
1059 {
1060         struct vsie_page *vsie_page;
1061         struct page *page;
1062         int i;
1063 
1064         mutex_lock(&kvm->arch.vsie.mutex);
1065         for (i = 0; i < kvm->arch.vsie.page_count; i++) {
1066                 page = kvm->arch.vsie.pages[i];
1067                 kvm->arch.vsie.pages[i] = NULL;
1068                 vsie_page = page_to_virt(page);
1069                 release_gmap_shadow(vsie_page);
1070                 /* free the radix tree entry */
1071                 radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9);
1072                 __free_page(page);
1073         }
1074         kvm->arch.vsie.page_count = 0;
1075         mutex_unlock(&kvm->arch.vsie.mutex);
1076 }
1077 
1078 void kvm_s390_vsie_kick(struct kvm_vcpu *vcpu)
1079 {
1080         struct kvm_s390_sie_block *scb = READ_ONCE(vcpu->arch.vsie_block);
1081 
1082         /*
1083          * Even if the VCPU lets go of the shadow sie block reference, it is
1084          * still valid in the cache. So we can safely kick it.
1085          */
1086         if (scb) {
1087                 atomic_or(PROG_BLOCK_SIE, &scb->prog20);
1088                 if (scb->prog0c & PROG_IN_SIE)
1089                         atomic_or(CPUSTAT_STOP_INT, &scb->cpuflags);
1090         }
1091 }
1092 

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