2 * kvm nested virtualization support for s390x
4 * Copyright IBM Corp. 2016
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.
10 * Author(s): David Hildenbrand <dahi@linux.vnet.ibm.com>
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>
18 #include <asm/mmu_context.h>
25 struct kvm_s390_sie_block scb_s; /* 0x0000 */
26 /* the pinned originial scb */
27 struct kvm_s390_sie_block *scb_o; /* 0x0200 */
28 /* the shadow gmap in use by the vsie_page */
29 struct gmap *gmap; /* 0x0208 */
30 __u8 reserved[0x1000 - 0x0210]; /* 0x0210 */
33 /* trigger a validity icpt for the given scb */
34 static int set_validity_icpt(struct kvm_s390_sie_block *scb,
38 scb->ipb = ((__u32) reason_code) << 16;
39 scb->icptcode = ICPT_VALIDITY;
43 /* mark the prefix as unmapped, this will block the VSIE */
44 static void prefix_unmapped(struct vsie_page *vsie_page)
46 atomic_or(PROG_REQUEST, &vsie_page->scb_s.prog20);
49 /* mark the prefix as unmapped and wait until the VSIE has been left */
50 static void prefix_unmapped_sync(struct vsie_page *vsie_page)
52 prefix_unmapped(vsie_page);
53 if (vsie_page->scb_s.prog0c & PROG_IN_SIE)
54 atomic_or(CPUSTAT_STOP_INT, &vsie_page->scb_s.cpuflags);
55 while (vsie_page->scb_s.prog0c & PROG_IN_SIE)
59 /* mark the prefix as mapped, this will allow the VSIE to run */
60 static void prefix_mapped(struct vsie_page *vsie_page)
62 atomic_andnot(PROG_REQUEST, &vsie_page->scb_s.prog20);
65 /* test if the prefix is mapped into the gmap shadow */
66 static int prefix_is_mapped(struct vsie_page *vsie_page)
68 return !(atomic_read(&vsie_page->scb_s.prog20) & PROG_REQUEST);
71 /* copy the updated intervention request bits into the shadow scb */
72 static void update_intervention_requests(struct vsie_page *vsie_page)
74 const int bits = CPUSTAT_STOP_INT | CPUSTAT_IO_INT | CPUSTAT_EXT_INT;
77 cpuflags = atomic_read(&vsie_page->scb_o->cpuflags);
78 atomic_andnot(bits, &vsie_page->scb_s.cpuflags);
79 atomic_or(cpuflags & bits, &vsie_page->scb_s.cpuflags);
82 /* shadow (filter and validate) the cpuflags */
83 static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
85 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
86 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
87 int newflags, cpuflags = atomic_read(&scb_o->cpuflags);
89 /* we don't allow ESA/390 guests */
90 if (!(cpuflags & CPUSTAT_ZARCH))
91 return set_validity_icpt(scb_s, 0x0001U);
93 if (cpuflags & (CPUSTAT_RRF | CPUSTAT_MCDS))
94 return set_validity_icpt(scb_s, 0x0001U);
95 else if (cpuflags & (CPUSTAT_SLSV | CPUSTAT_SLSR))
96 return set_validity_icpt(scb_s, 0x0007U);
98 /* intervention requests will be set later */
99 newflags = CPUSTAT_ZARCH;
100 if (cpuflags & CPUSTAT_GED && test_kvm_facility(vcpu->kvm, 8))
101 newflags |= CPUSTAT_GED;
102 if (cpuflags & CPUSTAT_GED2 && test_kvm_facility(vcpu->kvm, 78)) {
103 if (cpuflags & CPUSTAT_GED)
104 return set_validity_icpt(scb_s, 0x0001U);
105 newflags |= CPUSTAT_GED2;
108 atomic_set(&scb_s->cpuflags, newflags);
112 /* shadow (round up/down) the ibc to avoid validity icpt */
113 static void prepare_ibc(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
115 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
116 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
117 __u64 min_ibc = (sclp.ibc >> 16) & 0x0fffU;
120 /* ibc installed in g2 and requested for g3 */
121 if (vcpu->kvm->arch.model.ibc && (scb_o->ibc & 0x0fffU)) {
122 scb_s->ibc = scb_o->ibc & 0x0fffU;
123 /* takte care of the minimum ibc level of the machine */
124 if (scb_s->ibc < min_ibc)
125 scb_s->ibc = min_ibc;
126 /* take care of the maximum ibc level set for the guest */
127 if (scb_s->ibc > vcpu->kvm->arch.model.ibc)
128 scb_s->ibc = vcpu->kvm->arch.model.ibc;
132 /* unshadow the scb, copying parameters back to the real scb */
133 static void unshadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
135 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
136 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
139 scb_o->icptcode = scb_s->icptcode;
140 scb_o->icptstatus = scb_s->icptstatus;
141 scb_o->ipa = scb_s->ipa;
142 scb_o->ipb = scb_s->ipb;
143 scb_o->gbea = scb_s->gbea;
146 scb_o->cputm = scb_s->cputm;
147 scb_o->ckc = scb_s->ckc;
148 scb_o->todpr = scb_s->todpr;
151 scb_o->gpsw = scb_s->gpsw;
152 scb_o->gg14 = scb_s->gg14;
153 scb_o->gg15 = scb_s->gg15;
154 memcpy(scb_o->gcr, scb_s->gcr, 128);
155 scb_o->pp = scb_s->pp;
157 /* interrupt intercept */
158 switch (scb_s->icptcode) {
162 memcpy((void *)((u64)scb_o + 0xc0),
163 (void *)((u64)scb_s + 0xc0), 0xf0 - 0xc0);
167 memcpy((void *)((u64)scb_o + 0xc0),
168 (void *)((u64)scb_s + 0xc0), 0xd0 - 0xc0);
172 if (scb_s->ihcpu != 0xffffU)
173 scb_o->ihcpu = scb_s->ihcpu;
177 * Setup the shadow scb by copying and checking the relevant parts of the g2
180 * Returns: - 0 if the scb has been shadowed
181 * - > 0 if control has to be given to guest 2
183 static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
185 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
186 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
187 unsigned long new_mso;
190 /* make sure we don't have any leftovers when reusing the scb */
198 rc = prepare_cpuflags(vcpu, vsie_page);
203 scb_s->cputm = scb_o->cputm;
204 scb_s->ckc = scb_o->ckc;
205 scb_s->todpr = scb_o->todpr;
206 scb_s->epoch = scb_o->epoch;
209 scb_s->gpsw = scb_o->gpsw;
210 scb_s->gg14 = scb_o->gg14;
211 scb_s->gg15 = scb_o->gg15;
212 memcpy(scb_s->gcr, scb_o->gcr, 128);
213 scb_s->pp = scb_o->pp;
215 /* interception / execution handling */
216 scb_s->gbea = scb_o->gbea;
217 scb_s->lctl = scb_o->lctl;
218 scb_s->svcc = scb_o->svcc;
219 scb_s->ictl = scb_o->ictl;
221 * SKEY handling functions can't deal with false setting of PTE invalid
222 * bits. Therefore we cannot provide interpretation and would later
223 * have to provide own emulation handlers.
225 scb_s->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
226 scb_s->icpua = scb_o->icpua;
228 new_mso = scb_o->mso & 0xfffffffffff00000UL;
229 /* if the hva of the prefix changes, we have to remap the prefix */
230 if (scb_s->mso != new_mso || scb_s->prefix != scb_o->prefix)
231 prefix_unmapped(vsie_page);
232 /* SIE will do mso/msl validity and exception checks for us */
233 scb_s->msl = scb_o->msl & 0xfffffffffff00000UL;
234 scb_s->mso = new_mso;
235 scb_s->prefix = scb_o->prefix;
237 /* We have to definetly flush the tlb if this scb never ran */
238 if (scb_s->ihcpu != 0xffffU)
239 scb_s->ihcpu = scb_o->ihcpu;
241 /* MVPG and Protection Exception Interpretation are always available */
242 scb_s->eca |= scb_o->eca & 0x01002000U;
243 /* Host-protection-interruption introduced with ESOP */
244 if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_ESOP))
245 scb_s->ecb |= scb_o->ecb & 0x02U;
247 prepare_ibc(vcpu, vsie_page);
250 unshadow_scb(vcpu, vsie_page);
254 void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start,
257 struct kvm *kvm = gmap->private;
258 struct vsie_page *cur;
259 unsigned long prefix;
263 if (!gmap_is_shadow(gmap))
265 if (start >= 1UL << 31)
266 /* We are only interested in prefix pages */
270 * Only new shadow blocks are added to the list during runtime,
271 * therefore we can safely reference them all the time.
273 for (i = 0; i < kvm->arch.vsie.page_count; i++) {
274 page = READ_ONCE(kvm->arch.vsie.pages[i]);
277 cur = page_to_virt(page);
278 if (READ_ONCE(cur->gmap) != gmap)
280 prefix = cur->scb_s.prefix << GUEST_PREFIX_SHIFT;
281 /* with mso/msl, the prefix lies at an offset */
282 prefix += cur->scb_s.mso;
283 if (prefix <= end && start <= prefix + PAGE_SIZE - 1)
284 prefix_unmapped_sync(cur);
289 * Map the first prefix page.
291 * The prefix will be protected, a gmap notifier will inform about unmaps.
292 * The shadow scb must not be executed until the prefix is remapped, this is
293 * guaranteed by properly handling PROG_REQUEST.
295 * Returns: - 0 on if successfully mapped or already mapped
296 * - > 0 if control has to be given to guest 2
297 * - -EAGAIN if the caller can retry immediately
298 * - -ENOMEM if out of memory
300 static int map_prefix(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
302 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
303 u64 prefix = scb_s->prefix << GUEST_PREFIX_SHIFT;
306 if (prefix_is_mapped(vsie_page))
309 /* mark it as mapped so we can catch any concurrent unmappers */
310 prefix_mapped(vsie_page);
312 /* with mso/msl, the prefix lies at offset *mso* */
313 prefix += scb_s->mso;
315 rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, prefix);
317 * We don't have to mprotect, we will be called for all unshadows.
318 * SIE will detect if protection applies and trigger a validity.
321 prefix_unmapped(vsie_page);
322 if (rc > 0 || rc == -EFAULT)
323 rc = set_validity_icpt(scb_s, 0x0037U);
328 * Pin the guest page given by gpa and set hpa to the pinned host address.
329 * Will always be pinned writable.
331 * Returns: - 0 on success
332 * - -EINVAL if the gpa is not valid guest storage
333 * - -ENOMEM if out of memory
335 static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa)
341 hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));
342 if (kvm_is_error_hva(hva))
344 rc = get_user_pages_fast(hva, 1, 1, &page);
349 *hpa = (hpa_t) page_to_virt(page) + (gpa & ~PAGE_MASK);
353 /* Unpins a page previously pinned via pin_guest_page, marking it as dirty. */
354 static void unpin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t hpa)
358 page = virt_to_page(hpa);
359 set_page_dirty_lock(page);
361 /* mark the page always as dirty for migration */
362 mark_page_dirty(kvm, gpa_to_gfn(gpa));
365 /* unpin all blocks previously pinned by pin_blocks(), marking them dirty */
366 static void unpin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
368 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
369 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
373 hpa = (u64) scb_s->scaoh << 32 | scb_s->scaol;
375 gpa = scb_o->scaol & ~0xfUL;
376 unpin_guest_page(vcpu->kvm, gpa, hpa);
383 * Instead of shadowing some blocks, we can simply forward them because the
384 * addresses in the scb are 64 bit long.
386 * This works as long as the data lies in one page. If blocks ever exceed one
387 * page, we have to fall back to shadowing.
389 * As we reuse the sca, the vcpu pointers contained in it are invalid. We must
390 * therefore not enable any facilities that access these pointers (e.g. SIGPIF).
392 * Returns: - 0 if all blocks were pinned.
393 * - > 0 if control has to be given to guest 2
394 * - -ENOMEM if out of memory
396 static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
398 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
399 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
404 gpa = scb_o->scaol & ~0xfUL;
406 if (!(gpa & ~0x1fffUL))
407 rc = set_validity_icpt(scb_s, 0x0038U);
408 else if ((gpa & ~0x1fffUL) == kvm_s390_get_prefix(vcpu))
409 rc = set_validity_icpt(scb_s, 0x0011U);
410 else if ((gpa & PAGE_MASK) !=
411 ((gpa + sizeof(struct bsca_block) - 1) & PAGE_MASK))
412 rc = set_validity_icpt(scb_s, 0x003bU);
414 rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
416 rc = set_validity_icpt(scb_s, 0x0034U);
420 scb_s->scaoh = (u32)((u64)hpa >> 32);
421 scb_s->scaol = (u32)(u64)hpa;
425 unpin_blocks(vcpu, vsie_page);
429 /* unpin the scb provided by guest 2, marking it as dirty */
430 static void unpin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page,
433 hpa_t hpa = (hpa_t) vsie_page->scb_o;
436 unpin_guest_page(vcpu->kvm, gpa, hpa);
437 vsie_page->scb_o = NULL;
441 * Pin the scb at gpa provided by guest 2 at vsie_page->scb_o.
443 * Returns: - 0 if the scb was pinned.
444 * - > 0 if control has to be given to guest 2
445 * - -ENOMEM if out of memory
447 static int pin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page,
453 rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
455 rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
460 vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa;
465 * Inject a fault into guest 2.
467 * Returns: - > 0 if control has to be given to guest 2
468 * < 0 if an error occurred during injection.
470 static int inject_fault(struct kvm_vcpu *vcpu, __u16 code, __u64 vaddr,
473 struct kvm_s390_pgm_info pgm = {
476 /* 0-51: virtual address */
477 (vaddr & 0xfffffffffffff000UL) |
478 /* 52-53: store / fetch */
479 (((unsigned int) !write_flag) + 1) << 10,
480 /* 62-63: asce id (alway primary == 0) */
481 .exc_access_id = 0, /* always primary */
482 .op_access_id = 0, /* not MVPG */
486 if (code == PGM_PROTECTION)
487 pgm.trans_exc_code |= 0x4UL;
489 rc = kvm_s390_inject_prog_irq(vcpu, &pgm);
494 * Handle a fault during vsie execution on a gmap shadow.
496 * Returns: - 0 if the fault was resolved
497 * - > 0 if control has to be given to guest 2
498 * - < 0 if an error occurred
500 static int handle_fault(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
504 if (current->thread.gmap_int_code == PGM_PROTECTION)
505 /* we can directly forward all protection exceptions */
506 return inject_fault(vcpu, PGM_PROTECTION,
507 current->thread.gmap_addr, 1);
509 rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap,
510 current->thread.gmap_addr);
512 rc = inject_fault(vcpu, rc,
513 current->thread.gmap_addr,
514 current->thread.gmap_write_flag);
519 static inline void clear_vsie_icpt(struct vsie_page *vsie_page)
521 vsie_page->scb_s.icptcode = 0;
525 * Run the vsie on a shadow scb and a shadow gmap, without any further
526 * sanity checks, handling SIE faults.
528 * Returns: - 0 everything went fine
529 * - > 0 if control has to be given to guest 2
530 * - < 0 if an error occurred
532 static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
534 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
535 struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
540 if (test_cpu_flag(CIF_MCCK_PENDING))
543 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
548 rc = sie64a(scb_s, vcpu->run->s.regs.gprs);
553 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
556 rc = 0; /* we could still have an icpt */
557 else if (rc == -EFAULT)
558 return handle_fault(vcpu, vsie_page);
560 switch (scb_s->icptcode) {
562 /* stop not requested by g2 - must have been a kick */
563 if (!(atomic_read(&scb_o->cpuflags) & CPUSTAT_STOP_INT))
564 clear_vsie_icpt(vsie_page);
567 if ((scb_s->ipa & 0xf000) != 0xf000)
568 scb_s->ipa += 0x1000;
574 static void release_gmap_shadow(struct vsie_page *vsie_page)
577 gmap_put(vsie_page->gmap);
578 WRITE_ONCE(vsie_page->gmap, NULL);
579 prefix_unmapped(vsie_page);
582 static int acquire_gmap_shadow(struct kvm_vcpu *vcpu,
583 struct vsie_page *vsie_page)
590 asce = vcpu->arch.sie_block->gcr[1];
591 cr0.val = vcpu->arch.sie_block->gcr[0];
592 edat = cr0.edat && test_kvm_facility(vcpu->kvm, 8);
593 edat += edat && test_kvm_facility(vcpu->kvm, 78);
596 * ASCE or EDAT could have changed since last icpt, or the gmap
597 * we're holding has been unshadowed. If the gmap is still valid,
598 * we can safely reuse it.
600 if (vsie_page->gmap && gmap_shadow_valid(vsie_page->gmap, asce, edat))
603 /* release the old shadow - if any, and mark the prefix as unmapped */
604 release_gmap_shadow(vsie_page);
605 gmap = gmap_shadow(vcpu->arch.gmap, asce, edat);
607 return PTR_ERR(gmap);
608 gmap->private = vcpu->kvm;
609 WRITE_ONCE(vsie_page->gmap, gmap);
614 * Run the vsie on a shadowed scb, managing the gmap shadow, handling
615 * prefix pages and faults.
617 * Returns: - 0 if no errors occurred
618 * - > 0 if control has to be given to guest 2
619 * - -ENOMEM if out of memory
621 static int vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
623 struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
627 rc = acquire_gmap_shadow(vcpu, vsie_page);
629 rc = map_prefix(vcpu, vsie_page);
631 gmap_enable(vsie_page->gmap);
632 update_intervention_requests(vsie_page);
633 rc = do_vsie_run(vcpu, vsie_page);
634 gmap_enable(vcpu->arch.gmap);
639 if (rc || scb_s->icptcode || signal_pending(current) ||
640 kvm_s390_vcpu_has_irq(vcpu, 0))
646 * Addressing exceptions are always presentes as intercepts.
647 * As addressing exceptions are suppressing and our guest 3 PSW
648 * points at the responsible instruction, we have to
649 * forward the PSW and set the ilc. If we can't read guest 3
650 * instruction, we can use an arbitrary ilc. Let's always use
651 * ilen = 4 for now, so we can avoid reading in guest 3 virtual
652 * memory. (we could also fake the shadow so the hardware
655 scb_s->icptcode = ICPT_PROGI;
656 scb_s->iprcc = PGM_ADDRESSING;
658 scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, 4);
664 * Get or create a vsie page for a scb address.
666 * Returns: - address of a vsie page (cached or new one)
667 * - NULL if the same scb address is already used by another VCPU
668 * - ERR_PTR(-ENOMEM) if out of memory
670 static struct vsie_page *get_vsie_page(struct kvm *kvm, unsigned long addr)
672 struct vsie_page *vsie_page;
677 page = radix_tree_lookup(&kvm->arch.vsie.addr_to_page, addr >> 9);
680 if (page_ref_inc_return(page) == 2)
681 return page_to_virt(page);
686 * We want at least #online_vcpus shadows, so every VCPU can execute
687 * the VSIE in parallel.
689 nr_vcpus = atomic_read(&kvm->online_vcpus);
691 mutex_lock(&kvm->arch.vsie.mutex);
692 if (kvm->arch.vsie.page_count < nr_vcpus) {
693 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
695 mutex_unlock(&kvm->arch.vsie.mutex);
696 return ERR_PTR(-ENOMEM);
699 kvm->arch.vsie.pages[kvm->arch.vsie.page_count] = page;
700 kvm->arch.vsie.page_count++;
702 /* reuse an existing entry that belongs to nobody */
704 page = kvm->arch.vsie.pages[kvm->arch.vsie.next];
705 if (page_ref_inc_return(page) == 2)
708 kvm->arch.vsie.next++;
709 kvm->arch.vsie.next %= nr_vcpus;
711 radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9);
714 /* double use of the same address */
715 if (radix_tree_insert(&kvm->arch.vsie.addr_to_page, addr >> 9, page)) {
717 mutex_unlock(&kvm->arch.vsie.mutex);
720 mutex_unlock(&kvm->arch.vsie.mutex);
722 vsie_page = page_to_virt(page);
723 memset(&vsie_page->scb_s, 0, sizeof(struct kvm_s390_sie_block));
724 release_gmap_shadow(vsie_page);
725 vsie_page->scb_s.ihcpu = 0xffffU;
729 /* put a vsie page acquired via get_vsie_page */
730 static void put_vsie_page(struct kvm *kvm, struct vsie_page *vsie_page)
732 struct page *page = pfn_to_page(__pa(vsie_page) >> PAGE_SHIFT);
737 int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu)
739 struct vsie_page *vsie_page;
740 unsigned long scb_addr;
743 vcpu->stat.instruction_sie++;
744 if (!test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIEF2))
746 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
747 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
749 BUILD_BUG_ON(sizeof(struct vsie_page) != 4096);
750 scb_addr = kvm_s390_get_base_disp_s(vcpu, NULL);
752 /* 512 byte alignment */
753 if (unlikely(scb_addr & 0x1ffUL))
754 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
756 if (signal_pending(current) || kvm_s390_vcpu_has_irq(vcpu, 0))
759 vsie_page = get_vsie_page(vcpu->kvm, scb_addr);
760 if (IS_ERR(vsie_page))
761 return PTR_ERR(vsie_page);
763 /* double use of sie control block - simply do nothing */
766 rc = pin_scb(vcpu, vsie_page, scb_addr);
769 rc = shadow_scb(vcpu, vsie_page);
772 rc = pin_blocks(vcpu, vsie_page);
775 rc = vsie_run(vcpu, vsie_page);
776 unpin_blocks(vcpu, vsie_page);
778 unshadow_scb(vcpu, vsie_page);
780 unpin_scb(vcpu, vsie_page, scb_addr);
782 put_vsie_page(vcpu->kvm, vsie_page);
784 return rc < 0 ? rc : 0;
787 /* Init the vsie data structures. To be called when a vm is initialized. */
788 void kvm_s390_vsie_init(struct kvm *kvm)
790 mutex_init(&kvm->arch.vsie.mutex);
791 INIT_RADIX_TREE(&kvm->arch.vsie.addr_to_page, GFP_KERNEL);
794 /* Destroy the vsie data structures. To be called when a vm is destroyed. */
795 void kvm_s390_vsie_destroy(struct kvm *kvm)
797 struct vsie_page *vsie_page;
801 mutex_lock(&kvm->arch.vsie.mutex);
802 for (i = 0; i < kvm->arch.vsie.page_count; i++) {
803 page = kvm->arch.vsie.pages[i];
804 kvm->arch.vsie.pages[i] = NULL;
805 vsie_page = page_to_virt(page);
806 release_gmap_shadow(vsie_page);
807 /* free the radix tree entry */
808 radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9);
811 kvm->arch.vsie.page_count = 0;
812 mutex_unlock(&kvm->arch.vsie.mutex);