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10#include <linux/kvm_types.h>
11#include <linux/kvm_host.h>
12#include <linux/kernel.h>
13#include <linux/highmem.h>
14#include <linux/psp-sev.h>
15#include <linux/pagemap.h>
16#include <linux/swap.h>
17#include <linux/misc_cgroup.h>
18#include <linux/processor.h>
19#include <linux/trace_events.h>
20#include <asm/fpu/internal.h>
21
22#include <asm/pkru.h>
23#include <asm/trapnr.h>
24
25#include "x86.h"
26#include "svm.h"
27#include "svm_ops.h"
28#include "cpuid.h"
29#include "trace.h"
30
31#ifndef CONFIG_KVM_AMD_SEV
32
33
34
35
36
37
38
39
40
41
42#define MISC_CG_RES_SEV MISC_CG_RES_TYPES
43#define MISC_CG_RES_SEV_ES MISC_CG_RES_TYPES
44#endif
45
46#ifdef CONFIG_KVM_AMD_SEV
47
48static bool sev_enabled = true;
49module_param_named(sev, sev_enabled, bool, 0444);
50
51
52static bool sev_es_enabled = true;
53module_param_named(sev_es, sev_es_enabled, bool, 0444);
54#else
55#define sev_enabled false
56#define sev_es_enabled false
57#endif
58
59static u8 sev_enc_bit;
60static DECLARE_RWSEM(sev_deactivate_lock);
61static DEFINE_MUTEX(sev_bitmap_lock);
62unsigned int max_sev_asid;
63static unsigned int min_sev_asid;
64static unsigned long sev_me_mask;
65static unsigned int nr_asids;
66static unsigned long *sev_asid_bitmap;
67static unsigned long *sev_reclaim_asid_bitmap;
68
69struct enc_region {
70 struct list_head list;
71 unsigned long npages;
72 struct page **pages;
73 unsigned long uaddr;
74 unsigned long size;
75};
76
77
78static int sev_flush_asids(int min_asid, int max_asid)
79{
80 int ret, asid, error = 0;
81
82
83 asid = find_next_bit(sev_reclaim_asid_bitmap, nr_asids, min_asid);
84 if (asid > max_asid)
85 return -EBUSY;
86
87
88
89
90
91 down_write(&sev_deactivate_lock);
92
93 wbinvd_on_all_cpus();
94 ret = sev_guest_df_flush(&error);
95
96 up_write(&sev_deactivate_lock);
97
98 if (ret)
99 pr_err("SEV: DF_FLUSH failed, ret=%d, error=%#x\n", ret, error);
100
101 return ret;
102}
103
104static inline bool is_mirroring_enc_context(struct kvm *kvm)
105{
106 return !!to_kvm_svm(kvm)->sev_info.enc_context_owner;
107}
108
109
110static bool __sev_recycle_asids(int min_asid, int max_asid)
111{
112 if (sev_flush_asids(min_asid, max_asid))
113 return false;
114
115
116 bitmap_xor(sev_asid_bitmap, sev_asid_bitmap, sev_reclaim_asid_bitmap,
117 nr_asids);
118 bitmap_zero(sev_reclaim_asid_bitmap, nr_asids);
119
120 return true;
121}
122
123static int sev_asid_new(struct kvm_sev_info *sev)
124{
125 int asid, min_asid, max_asid, ret;
126 bool retry = true;
127 enum misc_res_type type;
128
129 type = sev->es_active ? MISC_CG_RES_SEV_ES : MISC_CG_RES_SEV;
130 WARN_ON(sev->misc_cg);
131 sev->misc_cg = get_current_misc_cg();
132 ret = misc_cg_try_charge(type, sev->misc_cg, 1);
133 if (ret) {
134 put_misc_cg(sev->misc_cg);
135 sev->misc_cg = NULL;
136 return ret;
137 }
138
139 mutex_lock(&sev_bitmap_lock);
140
141
142
143
144
145 min_asid = sev->es_active ? 1 : min_sev_asid;
146 max_asid = sev->es_active ? min_sev_asid - 1 : max_sev_asid;
147again:
148 asid = find_next_zero_bit(sev_asid_bitmap, max_asid + 1, min_asid);
149 if (asid > max_asid) {
150 if (retry && __sev_recycle_asids(min_asid, max_asid)) {
151 retry = false;
152 goto again;
153 }
154 mutex_unlock(&sev_bitmap_lock);
155 ret = -EBUSY;
156 goto e_uncharge;
157 }
158
159 __set_bit(asid, sev_asid_bitmap);
160
161 mutex_unlock(&sev_bitmap_lock);
162
163 return asid;
164e_uncharge:
165 misc_cg_uncharge(type, sev->misc_cg, 1);
166 put_misc_cg(sev->misc_cg);
167 sev->misc_cg = NULL;
168 return ret;
169}
170
171static int sev_get_asid(struct kvm *kvm)
172{
173 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
174
175 return sev->asid;
176}
177
178static void sev_asid_free(struct kvm_sev_info *sev)
179{
180 struct svm_cpu_data *sd;
181 int cpu;
182 enum misc_res_type type;
183
184 mutex_lock(&sev_bitmap_lock);
185
186 __set_bit(sev->asid, sev_reclaim_asid_bitmap);
187
188 for_each_possible_cpu(cpu) {
189 sd = per_cpu(svm_data, cpu);
190 sd->sev_vmcbs[sev->asid] = NULL;
191 }
192
193 mutex_unlock(&sev_bitmap_lock);
194
195 type = sev->es_active ? MISC_CG_RES_SEV_ES : MISC_CG_RES_SEV;
196 misc_cg_uncharge(type, sev->misc_cg, 1);
197 put_misc_cg(sev->misc_cg);
198 sev->misc_cg = NULL;
199}
200
201static void sev_decommission(unsigned int handle)
202{
203 struct sev_data_decommission decommission;
204
205 if (!handle)
206 return;
207
208 decommission.handle = handle;
209 sev_guest_decommission(&decommission, NULL);
210}
211
212static void sev_unbind_asid(struct kvm *kvm, unsigned int handle)
213{
214 struct sev_data_deactivate deactivate;
215
216 if (!handle)
217 return;
218
219 deactivate.handle = handle;
220
221
222 down_read(&sev_deactivate_lock);
223 sev_guest_deactivate(&deactivate, NULL);
224 up_read(&sev_deactivate_lock);
225
226 sev_decommission(handle);
227}
228
229static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
230{
231 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
232 bool es_active = argp->id == KVM_SEV_ES_INIT;
233 int asid, ret;
234
235 if (kvm->created_vcpus)
236 return -EINVAL;
237
238 ret = -EBUSY;
239 if (unlikely(sev->active))
240 return ret;
241
242 sev->es_active = es_active;
243 asid = sev_asid_new(sev);
244 if (asid < 0)
245 goto e_no_asid;
246 sev->asid = asid;
247
248 ret = sev_platform_init(&argp->error);
249 if (ret)
250 goto e_free;
251
252 sev->active = true;
253 sev->asid = asid;
254 INIT_LIST_HEAD(&sev->regions_list);
255
256 return 0;
257
258e_free:
259 sev_asid_free(sev);
260 sev->asid = 0;
261e_no_asid:
262 sev->es_active = false;
263 return ret;
264}
265
266static int sev_bind_asid(struct kvm *kvm, unsigned int handle, int *error)
267{
268 struct sev_data_activate activate;
269 int asid = sev_get_asid(kvm);
270 int ret;
271
272
273 activate.handle = handle;
274 activate.asid = asid;
275 ret = sev_guest_activate(&activate, error);
276
277 return ret;
278}
279
280static int __sev_issue_cmd(int fd, int id, void *data, int *error)
281{
282 struct fd f;
283 int ret;
284
285 f = fdget(fd);
286 if (!f.file)
287 return -EBADF;
288
289 ret = sev_issue_cmd_external_user(f.file, id, data, error);
290
291 fdput(f);
292 return ret;
293}
294
295static int sev_issue_cmd(struct kvm *kvm, int id, void *data, int *error)
296{
297 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
298
299 return __sev_issue_cmd(sev->fd, id, data, error);
300}
301
302static int sev_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
303{
304 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
305 struct sev_data_launch_start start;
306 struct kvm_sev_launch_start params;
307 void *dh_blob, *session_blob;
308 int *error = &argp->error;
309 int ret;
310
311 if (!sev_guest(kvm))
312 return -ENOTTY;
313
314 if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params)))
315 return -EFAULT;
316
317 memset(&start, 0, sizeof(start));
318
319 dh_blob = NULL;
320 if (params.dh_uaddr) {
321 dh_blob = psp_copy_user_blob(params.dh_uaddr, params.dh_len);
322 if (IS_ERR(dh_blob))
323 return PTR_ERR(dh_blob);
324
325 start.dh_cert_address = __sme_set(__pa(dh_blob));
326 start.dh_cert_len = params.dh_len;
327 }
328
329 session_blob = NULL;
330 if (params.session_uaddr) {
331 session_blob = psp_copy_user_blob(params.session_uaddr, params.session_len);
332 if (IS_ERR(session_blob)) {
333 ret = PTR_ERR(session_blob);
334 goto e_free_dh;
335 }
336
337 start.session_address = __sme_set(__pa(session_blob));
338 start.session_len = params.session_len;
339 }
340
341 start.handle = params.handle;
342 start.policy = params.policy;
343
344
345 ret = __sev_issue_cmd(argp->sev_fd, SEV_CMD_LAUNCH_START, &start, error);
346 if (ret)
347 goto e_free_session;
348
349
350 ret = sev_bind_asid(kvm, start.handle, error);
351 if (ret) {
352 sev_decommission(start.handle);
353 goto e_free_session;
354 }
355
356
357 params.handle = start.handle;
358 if (copy_to_user((void __user *)(uintptr_t)argp->data, ¶ms, sizeof(params))) {
359 sev_unbind_asid(kvm, start.handle);
360 ret = -EFAULT;
361 goto e_free_session;
362 }
363
364 sev->handle = start.handle;
365 sev->fd = argp->sev_fd;
366
367e_free_session:
368 kfree(session_blob);
369e_free_dh:
370 kfree(dh_blob);
371 return ret;
372}
373
374static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr,
375 unsigned long ulen, unsigned long *n,
376 int write)
377{
378 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
379 unsigned long npages, size;
380 int npinned;
381 unsigned long locked, lock_limit;
382 struct page **pages;
383 unsigned long first, last;
384 int ret;
385
386 lockdep_assert_held(&kvm->lock);
387
388 if (ulen == 0 || uaddr + ulen < uaddr)
389 return ERR_PTR(-EINVAL);
390
391
392 first = (uaddr & PAGE_MASK) >> PAGE_SHIFT;
393 last = ((uaddr + ulen - 1) & PAGE_MASK) >> PAGE_SHIFT;
394 npages = (last - first + 1);
395
396 locked = sev->pages_locked + npages;
397 lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
398 if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
399 pr_err("SEV: %lu locked pages exceed the lock limit of %lu.\n", locked, lock_limit);
400 return ERR_PTR(-ENOMEM);
401 }
402
403 if (WARN_ON_ONCE(npages > INT_MAX))
404 return ERR_PTR(-EINVAL);
405
406
407 size = npages * sizeof(struct page *);
408 if (size > PAGE_SIZE)
409 pages = __vmalloc(size, GFP_KERNEL_ACCOUNT | __GFP_ZERO);
410 else
411 pages = kmalloc(size, GFP_KERNEL_ACCOUNT);
412
413 if (!pages)
414 return ERR_PTR(-ENOMEM);
415
416
417 npinned = pin_user_pages_fast(uaddr, npages, write ? FOLL_WRITE : 0, pages);
418 if (npinned != npages) {
419 pr_err("SEV: Failure locking %lu pages.\n", npages);
420 ret = -ENOMEM;
421 goto err;
422 }
423
424 *n = npages;
425 sev->pages_locked = locked;
426
427 return pages;
428
429err:
430 if (npinned > 0)
431 unpin_user_pages(pages, npinned);
432
433 kvfree(pages);
434 return ERR_PTR(ret);
435}
436
437static void sev_unpin_memory(struct kvm *kvm, struct page **pages,
438 unsigned long npages)
439{
440 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
441
442 unpin_user_pages(pages, npages);
443 kvfree(pages);
444 sev->pages_locked -= npages;
445}
446
447static void sev_clflush_pages(struct page *pages[], unsigned long npages)
448{
449 uint8_t *page_virtual;
450 unsigned long i;
451
452 if (this_cpu_has(X86_FEATURE_SME_COHERENT) || npages == 0 ||
453 pages == NULL)
454 return;
455
456 for (i = 0; i < npages; i++) {
457 page_virtual = kmap_atomic(pages[i]);
458 clflush_cache_range(page_virtual, PAGE_SIZE);
459 kunmap_atomic(page_virtual);
460 }
461}
462
463static unsigned long get_num_contig_pages(unsigned long idx,
464 struct page **inpages, unsigned long npages)
465{
466 unsigned long paddr, next_paddr;
467 unsigned long i = idx + 1, pages = 1;
468
469
470 paddr = __sme_page_pa(inpages[idx]);
471 while (i < npages) {
472 next_paddr = __sme_page_pa(inpages[i++]);
473 if ((paddr + PAGE_SIZE) == next_paddr) {
474 pages++;
475 paddr = next_paddr;
476 continue;
477 }
478 break;
479 }
480
481 return pages;
482}
483
484static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
485{
486 unsigned long vaddr, vaddr_end, next_vaddr, npages, pages, size, i;
487 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
488 struct kvm_sev_launch_update_data params;
489 struct sev_data_launch_update_data data;
490 struct page **inpages;
491 int ret;
492
493 if (!sev_guest(kvm))
494 return -ENOTTY;
495
496 if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params)))
497 return -EFAULT;
498
499 vaddr = params.uaddr;
500 size = params.len;
501 vaddr_end = vaddr + size;
502
503
504 inpages = sev_pin_memory(kvm, vaddr, size, &npages, 1);
505 if (IS_ERR(inpages))
506 return PTR_ERR(inpages);
507
508
509
510
511
512 sev_clflush_pages(inpages, npages);
513
514 data.reserved = 0;
515 data.handle = sev->handle;
516
517 for (i = 0; vaddr < vaddr_end; vaddr = next_vaddr, i += pages) {
518 int offset, len;
519
520
521
522
523
524 offset = vaddr & (PAGE_SIZE - 1);
525
526
527 pages = get_num_contig_pages(i, inpages, npages);
528
529 len = min_t(size_t, ((pages * PAGE_SIZE) - offset), size);
530
531 data.len = len;
532 data.address = __sme_page_pa(inpages[i]) + offset;
533 ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_DATA, &data, &argp->error);
534 if (ret)
535 goto e_unpin;
536
537 size -= len;
538 next_vaddr = vaddr + len;
539 }
540
541e_unpin:
542
543 for (i = 0; i < npages; i++) {
544 set_page_dirty_lock(inpages[i]);
545 mark_page_accessed(inpages[i]);
546 }
547
548 sev_unpin_memory(kvm, inpages, npages);
549 return ret;
550}
551
552static int sev_es_sync_vmsa(struct vcpu_svm *svm)
553{
554 struct vmcb_save_area *save = &svm->vmcb->save;
555
556
557 if (svm->vcpu.guest_debug || (save->dr7 & ~DR7_FIXED_1))
558 return -EINVAL;
559
560
561 save->rax = svm->vcpu.arch.regs[VCPU_REGS_RAX];
562 save->rbx = svm->vcpu.arch.regs[VCPU_REGS_RBX];
563 save->rcx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
564 save->rdx = svm->vcpu.arch.regs[VCPU_REGS_RDX];
565 save->rsp = svm->vcpu.arch.regs[VCPU_REGS_RSP];
566 save->rbp = svm->vcpu.arch.regs[VCPU_REGS_RBP];
567 save->rsi = svm->vcpu.arch.regs[VCPU_REGS_RSI];
568 save->rdi = svm->vcpu.arch.regs[VCPU_REGS_RDI];
569#ifdef CONFIG_X86_64
570 save->r8 = svm->vcpu.arch.regs[VCPU_REGS_R8];
571 save->r9 = svm->vcpu.arch.regs[VCPU_REGS_R9];
572 save->r10 = svm->vcpu.arch.regs[VCPU_REGS_R10];
573 save->r11 = svm->vcpu.arch.regs[VCPU_REGS_R11];
574 save->r12 = svm->vcpu.arch.regs[VCPU_REGS_R12];
575 save->r13 = svm->vcpu.arch.regs[VCPU_REGS_R13];
576 save->r14 = svm->vcpu.arch.regs[VCPU_REGS_R14];
577 save->r15 = svm->vcpu.arch.regs[VCPU_REGS_R15];
578#endif
579 save->rip = svm->vcpu.arch.regs[VCPU_REGS_RIP];
580
581
582 save->xcr0 = svm->vcpu.arch.xcr0;
583 save->pkru = svm->vcpu.arch.pkru;
584 save->xss = svm->vcpu.arch.ia32_xss;
585 save->dr6 = svm->vcpu.arch.dr6;
586
587
588
589
590
591
592
593 memcpy(svm->vmsa, save, sizeof(*save));
594
595 return 0;
596}
597
598static int __sev_launch_update_vmsa(struct kvm *kvm, struct kvm_vcpu *vcpu,
599 int *error)
600{
601 struct sev_data_launch_update_vmsa vmsa;
602 struct vcpu_svm *svm = to_svm(vcpu);
603 int ret;
604
605
606 ret = sev_es_sync_vmsa(svm);
607 if (ret)
608 return ret;
609
610
611
612
613
614
615 clflush_cache_range(svm->vmsa, PAGE_SIZE);
616
617 vmsa.reserved = 0;
618 vmsa.handle = to_kvm_svm(kvm)->sev_info.handle;
619 vmsa.address = __sme_pa(svm->vmsa);
620 vmsa.len = PAGE_SIZE;
621 ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_VMSA, &vmsa, error);
622 if (ret)
623 return ret;
624
625 vcpu->arch.guest_state_protected = true;
626 return 0;
627}
628
629static int sev_launch_update_vmsa(struct kvm *kvm, struct kvm_sev_cmd *argp)
630{
631 struct kvm_vcpu *vcpu;
632 int i, ret;
633
634 if (!sev_es_guest(kvm))
635 return -ENOTTY;
636
637 kvm_for_each_vcpu(i, vcpu, kvm) {
638 ret = mutex_lock_killable(&vcpu->mutex);
639 if (ret)
640 return ret;
641
642 ret = __sev_launch_update_vmsa(kvm, vcpu, &argp->error);
643
644 mutex_unlock(&vcpu->mutex);
645 if (ret)
646 return ret;
647 }
648
649 return 0;
650}
651
652static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp)
653{
654 void __user *measure = (void __user *)(uintptr_t)argp->data;
655 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
656 struct sev_data_launch_measure data;
657 struct kvm_sev_launch_measure params;
658 void __user *p = NULL;
659 void *blob = NULL;
660 int ret;
661
662 if (!sev_guest(kvm))
663 return -ENOTTY;
664
665 if (copy_from_user(¶ms, measure, sizeof(params)))
666 return -EFAULT;
667
668 memset(&data, 0, sizeof(data));
669
670
671 if (!params.len)
672 goto cmd;
673
674 p = (void __user *)(uintptr_t)params.uaddr;
675 if (p) {
676 if (params.len > SEV_FW_BLOB_MAX_SIZE)
677 return -EINVAL;
678
679 blob = kmalloc(params.len, GFP_KERNEL_ACCOUNT);
680 if (!blob)
681 return -ENOMEM;
682
683 data.address = __psp_pa(blob);
684 data.len = params.len;
685 }
686
687cmd:
688 data.handle = sev->handle;
689 ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_MEASURE, &data, &argp->error);
690
691
692
693
694 if (!params.len)
695 goto done;
696
697 if (ret)
698 goto e_free_blob;
699
700 if (blob) {
701 if (copy_to_user(p, blob, params.len))
702 ret = -EFAULT;
703 }
704
705done:
706 params.len = data.len;
707 if (copy_to_user(measure, ¶ms, sizeof(params)))
708 ret = -EFAULT;
709e_free_blob:
710 kfree(blob);
711 return ret;
712}
713
714static int sev_launch_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
715{
716 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
717 struct sev_data_launch_finish data;
718
719 if (!sev_guest(kvm))
720 return -ENOTTY;
721
722 data.handle = sev->handle;
723 return sev_issue_cmd(kvm, SEV_CMD_LAUNCH_FINISH, &data, &argp->error);
724}
725
726static int sev_guest_status(struct kvm *kvm, struct kvm_sev_cmd *argp)
727{
728 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
729 struct kvm_sev_guest_status params;
730 struct sev_data_guest_status data;
731 int ret;
732
733 if (!sev_guest(kvm))
734 return -ENOTTY;
735
736 memset(&data, 0, sizeof(data));
737
738 data.handle = sev->handle;
739 ret = sev_issue_cmd(kvm, SEV_CMD_GUEST_STATUS, &data, &argp->error);
740 if (ret)
741 return ret;
742
743 params.policy = data.policy;
744 params.state = data.state;
745 params.handle = data.handle;
746
747 if (copy_to_user((void __user *)(uintptr_t)argp->data, ¶ms, sizeof(params)))
748 ret = -EFAULT;
749
750 return ret;
751}
752
753static int __sev_issue_dbg_cmd(struct kvm *kvm, unsigned long src,
754 unsigned long dst, int size,
755 int *error, bool enc)
756{
757 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
758 struct sev_data_dbg data;
759
760 data.reserved = 0;
761 data.handle = sev->handle;
762 data.dst_addr = dst;
763 data.src_addr = src;
764 data.len = size;
765
766 return sev_issue_cmd(kvm,
767 enc ? SEV_CMD_DBG_ENCRYPT : SEV_CMD_DBG_DECRYPT,
768 &data, error);
769}
770
771static int __sev_dbg_decrypt(struct kvm *kvm, unsigned long src_paddr,
772 unsigned long dst_paddr, int sz, int *err)
773{
774 int offset;
775
776
777
778
779
780 offset = src_paddr & 15;
781 src_paddr = round_down(src_paddr, 16);
782 sz = round_up(sz + offset, 16);
783
784 return __sev_issue_dbg_cmd(kvm, src_paddr, dst_paddr, sz, err, false);
785}
786
787static int __sev_dbg_decrypt_user(struct kvm *kvm, unsigned long paddr,
788 void __user *dst_uaddr,
789 unsigned long dst_paddr,
790 int size, int *err)
791{
792 struct page *tpage = NULL;
793 int ret, offset;
794
795
796 if (!IS_ALIGNED(dst_paddr, 16) ||
797 !IS_ALIGNED(paddr, 16) ||
798 !IS_ALIGNED(size, 16)) {
799 tpage = (void *)alloc_page(GFP_KERNEL);
800 if (!tpage)
801 return -ENOMEM;
802
803 dst_paddr = __sme_page_pa(tpage);
804 }
805
806 ret = __sev_dbg_decrypt(kvm, paddr, dst_paddr, size, err);
807 if (ret)
808 goto e_free;
809
810 if (tpage) {
811 offset = paddr & 15;
812 if (copy_to_user(dst_uaddr, page_address(tpage) + offset, size))
813 ret = -EFAULT;
814 }
815
816e_free:
817 if (tpage)
818 __free_page(tpage);
819
820 return ret;
821}
822
823static int __sev_dbg_encrypt_user(struct kvm *kvm, unsigned long paddr,
824 void __user *vaddr,
825 unsigned long dst_paddr,
826 void __user *dst_vaddr,
827 int size, int *error)
828{
829 struct page *src_tpage = NULL;
830 struct page *dst_tpage = NULL;
831 int ret, len = size;
832
833
834 if (!IS_ALIGNED((unsigned long)vaddr, 16)) {
835 src_tpage = alloc_page(GFP_KERNEL);
836 if (!src_tpage)
837 return -ENOMEM;
838
839 if (copy_from_user(page_address(src_tpage), vaddr, size)) {
840 __free_page(src_tpage);
841 return -EFAULT;
842 }
843
844 paddr = __sme_page_pa(src_tpage);
845 }
846
847
848
849
850
851
852
853 if (!IS_ALIGNED((unsigned long)dst_vaddr, 16) || !IS_ALIGNED(size, 16)) {
854 int dst_offset;
855
856 dst_tpage = alloc_page(GFP_KERNEL);
857 if (!dst_tpage) {
858 ret = -ENOMEM;
859 goto e_free;
860 }
861
862 ret = __sev_dbg_decrypt(kvm, dst_paddr,
863 __sme_page_pa(dst_tpage), size, error);
864 if (ret)
865 goto e_free;
866
867
868
869
870
871 dst_offset = dst_paddr & 15;
872
873 if (src_tpage)
874 memcpy(page_address(dst_tpage) + dst_offset,
875 page_address(src_tpage), size);
876 else {
877 if (copy_from_user(page_address(dst_tpage) + dst_offset,
878 vaddr, size)) {
879 ret = -EFAULT;
880 goto e_free;
881 }
882 }
883
884 paddr = __sme_page_pa(dst_tpage);
885 dst_paddr = round_down(dst_paddr, 16);
886 len = round_up(size, 16);
887 }
888
889 ret = __sev_issue_dbg_cmd(kvm, paddr, dst_paddr, len, error, true);
890
891e_free:
892 if (src_tpage)
893 __free_page(src_tpage);
894 if (dst_tpage)
895 __free_page(dst_tpage);
896 return ret;
897}
898
899static int sev_dbg_crypt(struct kvm *kvm, struct kvm_sev_cmd *argp, bool dec)
900{
901 unsigned long vaddr, vaddr_end, next_vaddr;
902 unsigned long dst_vaddr;
903 struct page **src_p, **dst_p;
904 struct kvm_sev_dbg debug;
905 unsigned long n;
906 unsigned int size;
907 int ret;
908
909 if (!sev_guest(kvm))
910 return -ENOTTY;
911
912 if (copy_from_user(&debug, (void __user *)(uintptr_t)argp->data, sizeof(debug)))
913 return -EFAULT;
914
915 if (!debug.len || debug.src_uaddr + debug.len < debug.src_uaddr)
916 return -EINVAL;
917 if (!debug.dst_uaddr)
918 return -EINVAL;
919
920 vaddr = debug.src_uaddr;
921 size = debug.len;
922 vaddr_end = vaddr + size;
923 dst_vaddr = debug.dst_uaddr;
924
925 for (; vaddr < vaddr_end; vaddr = next_vaddr) {
926 int len, s_off, d_off;
927
928
929 src_p = sev_pin_memory(kvm, vaddr & PAGE_MASK, PAGE_SIZE, &n, 0);
930 if (IS_ERR(src_p))
931 return PTR_ERR(src_p);
932
933 dst_p = sev_pin_memory(kvm, dst_vaddr & PAGE_MASK, PAGE_SIZE, &n, 1);
934 if (IS_ERR(dst_p)) {
935 sev_unpin_memory(kvm, src_p, n);
936 return PTR_ERR(dst_p);
937 }
938
939
940
941
942
943
944 sev_clflush_pages(src_p, 1);
945 sev_clflush_pages(dst_p, 1);
946
947
948
949
950
951 s_off = vaddr & ~PAGE_MASK;
952 d_off = dst_vaddr & ~PAGE_MASK;
953 len = min_t(size_t, (PAGE_SIZE - s_off), size);
954
955 if (dec)
956 ret = __sev_dbg_decrypt_user(kvm,
957 __sme_page_pa(src_p[0]) + s_off,
958 (void __user *)dst_vaddr,
959 __sme_page_pa(dst_p[0]) + d_off,
960 len, &argp->error);
961 else
962 ret = __sev_dbg_encrypt_user(kvm,
963 __sme_page_pa(src_p[0]) + s_off,
964 (void __user *)vaddr,
965 __sme_page_pa(dst_p[0]) + d_off,
966 (void __user *)dst_vaddr,
967 len, &argp->error);
968
969 sev_unpin_memory(kvm, src_p, n);
970 sev_unpin_memory(kvm, dst_p, n);
971
972 if (ret)
973 goto err;
974
975 next_vaddr = vaddr + len;
976 dst_vaddr = dst_vaddr + len;
977 size -= len;
978 }
979err:
980 return ret;
981}
982
983static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
984{
985 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
986 struct sev_data_launch_secret data;
987 struct kvm_sev_launch_secret params;
988 struct page **pages;
989 void *blob, *hdr;
990 unsigned long n, i;
991 int ret, offset;
992
993 if (!sev_guest(kvm))
994 return -ENOTTY;
995
996 if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params)))
997 return -EFAULT;
998
999 pages = sev_pin_memory(kvm, params.guest_uaddr, params.guest_len, &n, 1);
1000 if (IS_ERR(pages))
1001 return PTR_ERR(pages);
1002
1003
1004
1005
1006
1007 sev_clflush_pages(pages, n);
1008
1009
1010
1011
1012
1013 if (get_num_contig_pages(0, pages, n) != n) {
1014 ret = -EINVAL;
1015 goto e_unpin_memory;
1016 }
1017
1018 memset(&data, 0, sizeof(data));
1019
1020 offset = params.guest_uaddr & (PAGE_SIZE - 1);
1021 data.guest_address = __sme_page_pa(pages[0]) + offset;
1022 data.guest_len = params.guest_len;
1023
1024 blob = psp_copy_user_blob(params.trans_uaddr, params.trans_len);
1025 if (IS_ERR(blob)) {
1026 ret = PTR_ERR(blob);
1027 goto e_unpin_memory;
1028 }
1029
1030 data.trans_address = __psp_pa(blob);
1031 data.trans_len = params.trans_len;
1032
1033 hdr = psp_copy_user_blob(params.hdr_uaddr, params.hdr_len);
1034 if (IS_ERR(hdr)) {
1035 ret = PTR_ERR(hdr);
1036 goto e_free_blob;
1037 }
1038 data.hdr_address = __psp_pa(hdr);
1039 data.hdr_len = params.hdr_len;
1040
1041 data.handle = sev->handle;
1042 ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_SECRET, &data, &argp->error);
1043
1044 kfree(hdr);
1045
1046e_free_blob:
1047 kfree(blob);
1048e_unpin_memory:
1049
1050 for (i = 0; i < n; i++) {
1051 set_page_dirty_lock(pages[i]);
1052 mark_page_accessed(pages[i]);
1053 }
1054 sev_unpin_memory(kvm, pages, n);
1055 return ret;
1056}
1057
1058static int sev_get_attestation_report(struct kvm *kvm, struct kvm_sev_cmd *argp)
1059{
1060 void __user *report = (void __user *)(uintptr_t)argp->data;
1061 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1062 struct sev_data_attestation_report data;
1063 struct kvm_sev_attestation_report params;
1064 void __user *p;
1065 void *blob = NULL;
1066 int ret;
1067
1068 if (!sev_guest(kvm))
1069 return -ENOTTY;
1070
1071 if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params)))
1072 return -EFAULT;
1073
1074 memset(&data, 0, sizeof(data));
1075
1076
1077 if (!params.len)
1078 goto cmd;
1079
1080 p = (void __user *)(uintptr_t)params.uaddr;
1081 if (p) {
1082 if (params.len > SEV_FW_BLOB_MAX_SIZE)
1083 return -EINVAL;
1084
1085 blob = kmalloc(params.len, GFP_KERNEL_ACCOUNT);
1086 if (!blob)
1087 return -ENOMEM;
1088
1089 data.address = __psp_pa(blob);
1090 data.len = params.len;
1091 memcpy(data.mnonce, params.mnonce, sizeof(params.mnonce));
1092 }
1093cmd:
1094 data.handle = sev->handle;
1095 ret = sev_issue_cmd(kvm, SEV_CMD_ATTESTATION_REPORT, &data, &argp->error);
1096
1097
1098
1099 if (!params.len)
1100 goto done;
1101
1102 if (ret)
1103 goto e_free_blob;
1104
1105 if (blob) {
1106 if (copy_to_user(p, blob, params.len))
1107 ret = -EFAULT;
1108 }
1109
1110done:
1111 params.len = data.len;
1112 if (copy_to_user(report, ¶ms, sizeof(params)))
1113 ret = -EFAULT;
1114e_free_blob:
1115 kfree(blob);
1116 return ret;
1117}
1118
1119
1120static int
1121__sev_send_start_query_session_length(struct kvm *kvm, struct kvm_sev_cmd *argp,
1122 struct kvm_sev_send_start *params)
1123{
1124 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1125 struct sev_data_send_start data;
1126 int ret;
1127
1128 memset(&data, 0, sizeof(data));
1129 data.handle = sev->handle;
1130 ret = sev_issue_cmd(kvm, SEV_CMD_SEND_START, &data, &argp->error);
1131
1132 params->session_len = data.session_len;
1133 if (copy_to_user((void __user *)(uintptr_t)argp->data, params,
1134 sizeof(struct kvm_sev_send_start)))
1135 ret = -EFAULT;
1136
1137 return ret;
1138}
1139
1140static int sev_send_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
1141{
1142 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1143 struct sev_data_send_start data;
1144 struct kvm_sev_send_start params;
1145 void *amd_certs, *session_data;
1146 void *pdh_cert, *plat_certs;
1147 int ret;
1148
1149 if (!sev_guest(kvm))
1150 return -ENOTTY;
1151
1152 if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data,
1153 sizeof(struct kvm_sev_send_start)))
1154 return -EFAULT;
1155
1156
1157 if (!params.session_len)
1158 return __sev_send_start_query_session_length(kvm, argp,
1159 ¶ms);
1160
1161
1162 if (!params.pdh_cert_uaddr || !params.pdh_cert_len ||
1163 !params.session_uaddr || params.session_len > SEV_FW_BLOB_MAX_SIZE)
1164 return -EINVAL;
1165
1166
1167 session_data = kmalloc(params.session_len, GFP_KERNEL_ACCOUNT);
1168 if (!session_data)
1169 return -ENOMEM;
1170
1171
1172 pdh_cert = psp_copy_user_blob(params.pdh_cert_uaddr,
1173 params.pdh_cert_len);
1174 if (IS_ERR(pdh_cert)) {
1175 ret = PTR_ERR(pdh_cert);
1176 goto e_free_session;
1177 }
1178
1179 plat_certs = psp_copy_user_blob(params.plat_certs_uaddr,
1180 params.plat_certs_len);
1181 if (IS_ERR(plat_certs)) {
1182 ret = PTR_ERR(plat_certs);
1183 goto e_free_pdh;
1184 }
1185
1186 amd_certs = psp_copy_user_blob(params.amd_certs_uaddr,
1187 params.amd_certs_len);
1188 if (IS_ERR(amd_certs)) {
1189 ret = PTR_ERR(amd_certs);
1190 goto e_free_plat_cert;
1191 }
1192
1193
1194 memset(&data, 0, sizeof(data));
1195 data.pdh_cert_address = __psp_pa(pdh_cert);
1196 data.pdh_cert_len = params.pdh_cert_len;
1197 data.plat_certs_address = __psp_pa(plat_certs);
1198 data.plat_certs_len = params.plat_certs_len;
1199 data.amd_certs_address = __psp_pa(amd_certs);
1200 data.amd_certs_len = params.amd_certs_len;
1201 data.session_address = __psp_pa(session_data);
1202 data.session_len = params.session_len;
1203 data.handle = sev->handle;
1204
1205 ret = sev_issue_cmd(kvm, SEV_CMD_SEND_START, &data, &argp->error);
1206
1207 if (!ret && copy_to_user((void __user *)(uintptr_t)params.session_uaddr,
1208 session_data, params.session_len)) {
1209 ret = -EFAULT;
1210 goto e_free_amd_cert;
1211 }
1212
1213 params.policy = data.policy;
1214 params.session_len = data.session_len;
1215 if (copy_to_user((void __user *)(uintptr_t)argp->data, ¶ms,
1216 sizeof(struct kvm_sev_send_start)))
1217 ret = -EFAULT;
1218
1219e_free_amd_cert:
1220 kfree(amd_certs);
1221e_free_plat_cert:
1222 kfree(plat_certs);
1223e_free_pdh:
1224 kfree(pdh_cert);
1225e_free_session:
1226 kfree(session_data);
1227 return ret;
1228}
1229
1230
1231static int
1232__sev_send_update_data_query_lengths(struct kvm *kvm, struct kvm_sev_cmd *argp,
1233 struct kvm_sev_send_update_data *params)
1234{
1235 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1236 struct sev_data_send_update_data data;
1237 int ret;
1238
1239 memset(&data, 0, sizeof(data));
1240 data.handle = sev->handle;
1241 ret = sev_issue_cmd(kvm, SEV_CMD_SEND_UPDATE_DATA, &data, &argp->error);
1242
1243 params->hdr_len = data.hdr_len;
1244 params->trans_len = data.trans_len;
1245
1246 if (copy_to_user((void __user *)(uintptr_t)argp->data, params,
1247 sizeof(struct kvm_sev_send_update_data)))
1248 ret = -EFAULT;
1249
1250 return ret;
1251}
1252
1253static int sev_send_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
1254{
1255 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1256 struct sev_data_send_update_data data;
1257 struct kvm_sev_send_update_data params;
1258 void *hdr, *trans_data;
1259 struct page **guest_page;
1260 unsigned long n;
1261 int ret, offset;
1262
1263 if (!sev_guest(kvm))
1264 return -ENOTTY;
1265
1266 if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data,
1267 sizeof(struct kvm_sev_send_update_data)))
1268 return -EFAULT;
1269
1270
1271 if (!params.trans_len || !params.hdr_len)
1272 return __sev_send_update_data_query_lengths(kvm, argp, ¶ms);
1273
1274 if (!params.trans_uaddr || !params.guest_uaddr ||
1275 !params.guest_len || !params.hdr_uaddr)
1276 return -EINVAL;
1277
1278
1279 offset = params.guest_uaddr & (PAGE_SIZE - 1);
1280 if ((params.guest_len + offset > PAGE_SIZE))
1281 return -EINVAL;
1282
1283
1284 guest_page = sev_pin_memory(kvm, params.guest_uaddr & PAGE_MASK,
1285 PAGE_SIZE, &n, 0);
1286 if (IS_ERR(guest_page))
1287 return PTR_ERR(guest_page);
1288
1289
1290 ret = -ENOMEM;
1291 hdr = kmalloc(params.hdr_len, GFP_KERNEL_ACCOUNT);
1292 if (!hdr)
1293 goto e_unpin;
1294
1295 trans_data = kmalloc(params.trans_len, GFP_KERNEL_ACCOUNT);
1296 if (!trans_data)
1297 goto e_free_hdr;
1298
1299 memset(&data, 0, sizeof(data));
1300 data.hdr_address = __psp_pa(hdr);
1301 data.hdr_len = params.hdr_len;
1302 data.trans_address = __psp_pa(trans_data);
1303 data.trans_len = params.trans_len;
1304
1305
1306 data.guest_address = (page_to_pfn(guest_page[0]) << PAGE_SHIFT) + offset;
1307 data.guest_address |= sev_me_mask;
1308 data.guest_len = params.guest_len;
1309 data.handle = sev->handle;
1310
1311 ret = sev_issue_cmd(kvm, SEV_CMD_SEND_UPDATE_DATA, &data, &argp->error);
1312
1313 if (ret)
1314 goto e_free_trans_data;
1315
1316
1317 if (copy_to_user((void __user *)(uintptr_t)params.trans_uaddr,
1318 trans_data, params.trans_len)) {
1319 ret = -EFAULT;
1320 goto e_free_trans_data;
1321 }
1322
1323
1324 if (copy_to_user((void __user *)(uintptr_t)params.hdr_uaddr, hdr,
1325 params.hdr_len))
1326 ret = -EFAULT;
1327
1328e_free_trans_data:
1329 kfree(trans_data);
1330e_free_hdr:
1331 kfree(hdr);
1332e_unpin:
1333 sev_unpin_memory(kvm, guest_page, n);
1334
1335 return ret;
1336}
1337
1338static int sev_send_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
1339{
1340 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1341 struct sev_data_send_finish data;
1342
1343 if (!sev_guest(kvm))
1344 return -ENOTTY;
1345
1346 data.handle = sev->handle;
1347 return sev_issue_cmd(kvm, SEV_CMD_SEND_FINISH, &data, &argp->error);
1348}
1349
1350static int sev_send_cancel(struct kvm *kvm, struct kvm_sev_cmd *argp)
1351{
1352 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1353 struct sev_data_send_cancel data;
1354
1355 if (!sev_guest(kvm))
1356 return -ENOTTY;
1357
1358 data.handle = sev->handle;
1359 return sev_issue_cmd(kvm, SEV_CMD_SEND_CANCEL, &data, &argp->error);
1360}
1361
1362static int sev_receive_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
1363{
1364 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1365 struct sev_data_receive_start start;
1366 struct kvm_sev_receive_start params;
1367 int *error = &argp->error;
1368 void *session_data;
1369 void *pdh_data;
1370 int ret;
1371
1372 if (!sev_guest(kvm))
1373 return -ENOTTY;
1374
1375
1376 if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data,
1377 sizeof(struct kvm_sev_receive_start)))
1378 return -EFAULT;
1379
1380
1381 if (!params.pdh_uaddr || !params.pdh_len ||
1382 !params.session_uaddr || !params.session_len)
1383 return -EINVAL;
1384
1385 pdh_data = psp_copy_user_blob(params.pdh_uaddr, params.pdh_len);
1386 if (IS_ERR(pdh_data))
1387 return PTR_ERR(pdh_data);
1388
1389 session_data = psp_copy_user_blob(params.session_uaddr,
1390 params.session_len);
1391 if (IS_ERR(session_data)) {
1392 ret = PTR_ERR(session_data);
1393 goto e_free_pdh;
1394 }
1395
1396 memset(&start, 0, sizeof(start));
1397 start.handle = params.handle;
1398 start.policy = params.policy;
1399 start.pdh_cert_address = __psp_pa(pdh_data);
1400 start.pdh_cert_len = params.pdh_len;
1401 start.session_address = __psp_pa(session_data);
1402 start.session_len = params.session_len;
1403
1404
1405 ret = __sev_issue_cmd(argp->sev_fd, SEV_CMD_RECEIVE_START, &start,
1406 error);
1407 if (ret)
1408 goto e_free_session;
1409
1410
1411 ret = sev_bind_asid(kvm, start.handle, error);
1412 if (ret) {
1413 sev_decommission(start.handle);
1414 goto e_free_session;
1415 }
1416
1417 params.handle = start.handle;
1418 if (copy_to_user((void __user *)(uintptr_t)argp->data,
1419 ¶ms, sizeof(struct kvm_sev_receive_start))) {
1420 ret = -EFAULT;
1421 sev_unbind_asid(kvm, start.handle);
1422 goto e_free_session;
1423 }
1424
1425 sev->handle = start.handle;
1426 sev->fd = argp->sev_fd;
1427
1428e_free_session:
1429 kfree(session_data);
1430e_free_pdh:
1431 kfree(pdh_data);
1432
1433 return ret;
1434}
1435
1436static int sev_receive_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
1437{
1438 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1439 struct kvm_sev_receive_update_data params;
1440 struct sev_data_receive_update_data data;
1441 void *hdr = NULL, *trans = NULL;
1442 struct page **guest_page;
1443 unsigned long n;
1444 int ret, offset;
1445
1446 if (!sev_guest(kvm))
1447 return -EINVAL;
1448
1449 if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data,
1450 sizeof(struct kvm_sev_receive_update_data)))
1451 return -EFAULT;
1452
1453 if (!params.hdr_uaddr || !params.hdr_len ||
1454 !params.guest_uaddr || !params.guest_len ||
1455 !params.trans_uaddr || !params.trans_len)
1456 return -EINVAL;
1457
1458
1459 offset = params.guest_uaddr & (PAGE_SIZE - 1);
1460 if ((params.guest_len + offset > PAGE_SIZE))
1461 return -EINVAL;
1462
1463 hdr = psp_copy_user_blob(params.hdr_uaddr, params.hdr_len);
1464 if (IS_ERR(hdr))
1465 return PTR_ERR(hdr);
1466
1467 trans = psp_copy_user_blob(params.trans_uaddr, params.trans_len);
1468 if (IS_ERR(trans)) {
1469 ret = PTR_ERR(trans);
1470 goto e_free_hdr;
1471 }
1472
1473 memset(&data, 0, sizeof(data));
1474 data.hdr_address = __psp_pa(hdr);
1475 data.hdr_len = params.hdr_len;
1476 data.trans_address = __psp_pa(trans);
1477 data.trans_len = params.trans_len;
1478
1479
1480 guest_page = sev_pin_memory(kvm, params.guest_uaddr & PAGE_MASK,
1481 PAGE_SIZE, &n, 1);
1482 if (IS_ERR(guest_page)) {
1483 ret = PTR_ERR(guest_page);
1484 goto e_free_trans;
1485 }
1486
1487
1488
1489
1490
1491
1492 sev_clflush_pages(guest_page, n);
1493
1494
1495 data.guest_address = (page_to_pfn(guest_page[0]) << PAGE_SHIFT) + offset;
1496 data.guest_address |= sev_me_mask;
1497 data.guest_len = params.guest_len;
1498 data.handle = sev->handle;
1499
1500 ret = sev_issue_cmd(kvm, SEV_CMD_RECEIVE_UPDATE_DATA, &data,
1501 &argp->error);
1502
1503 sev_unpin_memory(kvm, guest_page, n);
1504
1505e_free_trans:
1506 kfree(trans);
1507e_free_hdr:
1508 kfree(hdr);
1509
1510 return ret;
1511}
1512
1513static int sev_receive_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
1514{
1515 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1516 struct sev_data_receive_finish data;
1517
1518 if (!sev_guest(kvm))
1519 return -ENOTTY;
1520
1521 data.handle = sev->handle;
1522 return sev_issue_cmd(kvm, SEV_CMD_RECEIVE_FINISH, &data, &argp->error);
1523}
1524
1525static bool cmd_allowed_from_miror(u32 cmd_id)
1526{
1527
1528
1529
1530
1531 if (cmd_id == KVM_SEV_LAUNCH_UPDATE_VMSA ||
1532 cmd_id == KVM_SEV_GUEST_STATUS || cmd_id == KVM_SEV_DBG_DECRYPT ||
1533 cmd_id == KVM_SEV_DBG_ENCRYPT)
1534 return true;
1535
1536 return false;
1537}
1538
1539int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
1540{
1541 struct kvm_sev_cmd sev_cmd;
1542 int r;
1543
1544 if (!sev_enabled)
1545 return -ENOTTY;
1546
1547 if (!argp)
1548 return 0;
1549
1550 if (copy_from_user(&sev_cmd, argp, sizeof(struct kvm_sev_cmd)))
1551 return -EFAULT;
1552
1553 mutex_lock(&kvm->lock);
1554
1555
1556 if (is_mirroring_enc_context(kvm) &&
1557 !cmd_allowed_from_miror(sev_cmd.id)) {
1558 r = -EINVAL;
1559 goto out;
1560 }
1561
1562 switch (sev_cmd.id) {
1563 case KVM_SEV_ES_INIT:
1564 if (!sev_es_enabled) {
1565 r = -ENOTTY;
1566 goto out;
1567 }
1568 fallthrough;
1569 case KVM_SEV_INIT:
1570 r = sev_guest_init(kvm, &sev_cmd);
1571 break;
1572 case KVM_SEV_LAUNCH_START:
1573 r = sev_launch_start(kvm, &sev_cmd);
1574 break;
1575 case KVM_SEV_LAUNCH_UPDATE_DATA:
1576 r = sev_launch_update_data(kvm, &sev_cmd);
1577 break;
1578 case KVM_SEV_LAUNCH_UPDATE_VMSA:
1579 r = sev_launch_update_vmsa(kvm, &sev_cmd);
1580 break;
1581 case KVM_SEV_LAUNCH_MEASURE:
1582 r = sev_launch_measure(kvm, &sev_cmd);
1583 break;
1584 case KVM_SEV_LAUNCH_FINISH:
1585 r = sev_launch_finish(kvm, &sev_cmd);
1586 break;
1587 case KVM_SEV_GUEST_STATUS:
1588 r = sev_guest_status(kvm, &sev_cmd);
1589 break;
1590 case KVM_SEV_DBG_DECRYPT:
1591 r = sev_dbg_crypt(kvm, &sev_cmd, true);
1592 break;
1593 case KVM_SEV_DBG_ENCRYPT:
1594 r = sev_dbg_crypt(kvm, &sev_cmd, false);
1595 break;
1596 case KVM_SEV_LAUNCH_SECRET:
1597 r = sev_launch_secret(kvm, &sev_cmd);
1598 break;
1599 case KVM_SEV_GET_ATTESTATION_REPORT:
1600 r = sev_get_attestation_report(kvm, &sev_cmd);
1601 break;
1602 case KVM_SEV_SEND_START:
1603 r = sev_send_start(kvm, &sev_cmd);
1604 break;
1605 case KVM_SEV_SEND_UPDATE_DATA:
1606 r = sev_send_update_data(kvm, &sev_cmd);
1607 break;
1608 case KVM_SEV_SEND_FINISH:
1609 r = sev_send_finish(kvm, &sev_cmd);
1610 break;
1611 case KVM_SEV_SEND_CANCEL:
1612 r = sev_send_cancel(kvm, &sev_cmd);
1613 break;
1614 case KVM_SEV_RECEIVE_START:
1615 r = sev_receive_start(kvm, &sev_cmd);
1616 break;
1617 case KVM_SEV_RECEIVE_UPDATE_DATA:
1618 r = sev_receive_update_data(kvm, &sev_cmd);
1619 break;
1620 case KVM_SEV_RECEIVE_FINISH:
1621 r = sev_receive_finish(kvm, &sev_cmd);
1622 break;
1623 default:
1624 r = -EINVAL;
1625 goto out;
1626 }
1627
1628 if (copy_to_user(argp, &sev_cmd, sizeof(struct kvm_sev_cmd)))
1629 r = -EFAULT;
1630
1631out:
1632 mutex_unlock(&kvm->lock);
1633 return r;
1634}
1635
1636int svm_register_enc_region(struct kvm *kvm,
1637 struct kvm_enc_region *range)
1638{
1639 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1640 struct enc_region *region;
1641 int ret = 0;
1642
1643 if (!sev_guest(kvm))
1644 return -ENOTTY;
1645
1646
1647 if (is_mirroring_enc_context(kvm))
1648 return -EINVAL;
1649
1650 if (range->addr > ULONG_MAX || range->size > ULONG_MAX)
1651 return -EINVAL;
1652
1653 region = kzalloc(sizeof(*region), GFP_KERNEL_ACCOUNT);
1654 if (!region)
1655 return -ENOMEM;
1656
1657 mutex_lock(&kvm->lock);
1658 region->pages = sev_pin_memory(kvm, range->addr, range->size, ®ion->npages, 1);
1659 if (IS_ERR(region->pages)) {
1660 ret = PTR_ERR(region->pages);
1661 mutex_unlock(&kvm->lock);
1662 goto e_free;
1663 }
1664
1665 region->uaddr = range->addr;
1666 region->size = range->size;
1667
1668 list_add_tail(®ion->list, &sev->regions_list);
1669 mutex_unlock(&kvm->lock);
1670
1671
1672
1673
1674
1675
1676
1677 sev_clflush_pages(region->pages, region->npages);
1678
1679 return ret;
1680
1681e_free:
1682 kfree(region);
1683 return ret;
1684}
1685
1686static struct enc_region *
1687find_enc_region(struct kvm *kvm, struct kvm_enc_region *range)
1688{
1689 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1690 struct list_head *head = &sev->regions_list;
1691 struct enc_region *i;
1692
1693 list_for_each_entry(i, head, list) {
1694 if (i->uaddr == range->addr &&
1695 i->size == range->size)
1696 return i;
1697 }
1698
1699 return NULL;
1700}
1701
1702static void __unregister_enc_region_locked(struct kvm *kvm,
1703 struct enc_region *region)
1704{
1705 sev_unpin_memory(kvm, region->pages, region->npages);
1706 list_del(®ion->list);
1707 kfree(region);
1708}
1709
1710int svm_unregister_enc_region(struct kvm *kvm,
1711 struct kvm_enc_region *range)
1712{
1713 struct enc_region *region;
1714 int ret;
1715
1716
1717 if (is_mirroring_enc_context(kvm))
1718 return -EINVAL;
1719
1720 mutex_lock(&kvm->lock);
1721
1722 if (!sev_guest(kvm)) {
1723 ret = -ENOTTY;
1724 goto failed;
1725 }
1726
1727 region = find_enc_region(kvm, range);
1728 if (!region) {
1729 ret = -EINVAL;
1730 goto failed;
1731 }
1732
1733
1734
1735
1736
1737
1738 wbinvd_on_all_cpus();
1739
1740 __unregister_enc_region_locked(kvm, region);
1741
1742 mutex_unlock(&kvm->lock);
1743 return 0;
1744
1745failed:
1746 mutex_unlock(&kvm->lock);
1747 return ret;
1748}
1749
1750int svm_vm_copy_asid_from(struct kvm *kvm, unsigned int source_fd)
1751{
1752 struct file *source_kvm_file;
1753 struct kvm *source_kvm;
1754 struct kvm_sev_info source_sev, *mirror_sev;
1755 int ret;
1756
1757 source_kvm_file = fget(source_fd);
1758 if (!file_is_kvm(source_kvm_file)) {
1759 ret = -EBADF;
1760 goto e_source_put;
1761 }
1762
1763 source_kvm = source_kvm_file->private_data;
1764 mutex_lock(&source_kvm->lock);
1765
1766 if (!sev_guest(source_kvm)) {
1767 ret = -EINVAL;
1768 goto e_source_unlock;
1769 }
1770
1771
1772 if (is_mirroring_enc_context(source_kvm) || source_kvm == kvm) {
1773 ret = -EINVAL;
1774 goto e_source_unlock;
1775 }
1776
1777 memcpy(&source_sev, &to_kvm_svm(source_kvm)->sev_info,
1778 sizeof(source_sev));
1779
1780
1781
1782
1783
1784 kvm_get_kvm(source_kvm);
1785
1786 fput(source_kvm_file);
1787 mutex_unlock(&source_kvm->lock);
1788 mutex_lock(&kvm->lock);
1789
1790 if (sev_guest(kvm)) {
1791 ret = -EINVAL;
1792 goto e_mirror_unlock;
1793 }
1794
1795
1796 mirror_sev = &to_kvm_svm(kvm)->sev_info;
1797 mirror_sev->enc_context_owner = source_kvm;
1798 mirror_sev->active = true;
1799 mirror_sev->asid = source_sev.asid;
1800 mirror_sev->fd = source_sev.fd;
1801 mirror_sev->es_active = source_sev.es_active;
1802 mirror_sev->handle = source_sev.handle;
1803
1804
1805
1806
1807
1808
1809 mutex_unlock(&kvm->lock);
1810 return 0;
1811
1812e_mirror_unlock:
1813 mutex_unlock(&kvm->lock);
1814 kvm_put_kvm(source_kvm);
1815 return ret;
1816e_source_unlock:
1817 mutex_unlock(&source_kvm->lock);
1818e_source_put:
1819 if (source_kvm_file)
1820 fput(source_kvm_file);
1821 return ret;
1822}
1823
1824void sev_vm_destroy(struct kvm *kvm)
1825{
1826 struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1827 struct list_head *head = &sev->regions_list;
1828 struct list_head *pos, *q;
1829
1830 if (!sev_guest(kvm))
1831 return;
1832
1833
1834 if (is_mirroring_enc_context(kvm)) {
1835 kvm_put_kvm(sev->enc_context_owner);
1836 return;
1837 }
1838
1839 mutex_lock(&kvm->lock);
1840
1841
1842
1843
1844
1845
1846 wbinvd_on_all_cpus();
1847
1848
1849
1850
1851
1852 if (!list_empty(head)) {
1853 list_for_each_safe(pos, q, head) {
1854 __unregister_enc_region_locked(kvm,
1855 list_entry(pos, struct enc_region, list));
1856 cond_resched();
1857 }
1858 }
1859
1860 mutex_unlock(&kvm->lock);
1861
1862 sev_unbind_asid(kvm, sev->handle);
1863 sev_asid_free(sev);
1864}
1865
1866void __init sev_set_cpu_caps(void)
1867{
1868 if (!sev_enabled)
1869 kvm_cpu_cap_clear(X86_FEATURE_SEV);
1870 if (!sev_es_enabled)
1871 kvm_cpu_cap_clear(X86_FEATURE_SEV_ES);
1872}
1873
1874void __init sev_hardware_setup(void)
1875{
1876#ifdef CONFIG_KVM_AMD_SEV
1877 unsigned int eax, ebx, ecx, edx, sev_asid_count, sev_es_asid_count;
1878 bool sev_es_supported = false;
1879 bool sev_supported = false;
1880
1881 if (!sev_enabled || !npt_enabled)
1882 goto out;
1883
1884
1885 if (!boot_cpu_has(X86_FEATURE_SEV))
1886 goto out;
1887
1888
1889 cpuid(0x8000001f, &eax, &ebx, &ecx, &edx);
1890
1891
1892 sev_enc_bit = ebx & 0x3f;
1893
1894
1895 max_sev_asid = ecx;
1896 if (!max_sev_asid)
1897 goto out;
1898
1899
1900 min_sev_asid = edx;
1901 sev_me_mask = 1UL << (ebx & 0x3f);
1902
1903
1904
1905
1906
1907
1908 nr_asids = max_sev_asid + 1;
1909 sev_asid_bitmap = bitmap_zalloc(nr_asids, GFP_KERNEL);
1910 if (!sev_asid_bitmap)
1911 goto out;
1912
1913 sev_reclaim_asid_bitmap = bitmap_zalloc(nr_asids, GFP_KERNEL);
1914 if (!sev_reclaim_asid_bitmap) {
1915 bitmap_free(sev_asid_bitmap);
1916 sev_asid_bitmap = NULL;
1917 goto out;
1918 }
1919
1920 sev_asid_count = max_sev_asid - min_sev_asid + 1;
1921 if (misc_cg_set_capacity(MISC_CG_RES_SEV, sev_asid_count))
1922 goto out;
1923
1924 pr_info("SEV supported: %u ASIDs\n", sev_asid_count);
1925 sev_supported = true;
1926
1927
1928 if (!sev_es_enabled)
1929 goto out;
1930
1931
1932 if (!boot_cpu_has(X86_FEATURE_SEV_ES))
1933 goto out;
1934
1935
1936 if (min_sev_asid == 1)
1937 goto out;
1938
1939 sev_es_asid_count = min_sev_asid - 1;
1940 if (misc_cg_set_capacity(MISC_CG_RES_SEV_ES, sev_es_asid_count))
1941 goto out;
1942
1943 pr_info("SEV-ES supported: %u ASIDs\n", sev_es_asid_count);
1944 sev_es_supported = true;
1945
1946out:
1947 sev_enabled = sev_supported;
1948 sev_es_enabled = sev_es_supported;
1949#endif
1950}
1951
1952void sev_hardware_teardown(void)
1953{
1954 if (!sev_enabled)
1955 return;
1956
1957
1958 sev_flush_asids(1, max_sev_asid);
1959
1960 bitmap_free(sev_asid_bitmap);
1961 bitmap_free(sev_reclaim_asid_bitmap);
1962
1963 misc_cg_set_capacity(MISC_CG_RES_SEV, 0);
1964 misc_cg_set_capacity(MISC_CG_RES_SEV_ES, 0);
1965}
1966
1967int sev_cpu_init(struct svm_cpu_data *sd)
1968{
1969 if (!sev_enabled)
1970 return 0;
1971
1972 sd->sev_vmcbs = kcalloc(nr_asids, sizeof(void *), GFP_KERNEL);
1973 if (!sd->sev_vmcbs)
1974 return -ENOMEM;
1975
1976 return 0;
1977}
1978
1979
1980
1981
1982
1983static void sev_flush_guest_memory(struct vcpu_svm *svm, void *va,
1984 unsigned long len)
1985{
1986
1987
1988
1989
1990 if (boot_cpu_has(X86_FEATURE_SME_COHERENT))
1991 return;
1992
1993
1994
1995
1996
1997 if (boot_cpu_has(X86_FEATURE_VM_PAGE_FLUSH)) {
1998 struct kvm_sev_info *sev;
1999 unsigned long va_start;
2000 u64 start, stop;
2001
2002
2003 va_start = (unsigned long)va;
2004 start = (u64)va_start & PAGE_MASK;
2005 stop = PAGE_ALIGN((u64)va_start + len);
2006
2007 if (start < stop) {
2008 sev = &to_kvm_svm(svm->vcpu.kvm)->sev_info;
2009
2010 while (start < stop) {
2011 wrmsrl(MSR_AMD64_VM_PAGE_FLUSH,
2012 start | sev->asid);
2013
2014 start += PAGE_SIZE;
2015 }
2016
2017 return;
2018 }
2019
2020 WARN(1, "Address overflow, using WBINVD\n");
2021 }
2022
2023
2024
2025
2026
2027 WARN_ONCE(1, "Using WBINVD to flush guest memory\n");
2028 wbinvd_on_all_cpus();
2029}
2030
2031void sev_free_vcpu(struct kvm_vcpu *vcpu)
2032{
2033 struct vcpu_svm *svm;
2034
2035 if (!sev_es_guest(vcpu->kvm))
2036 return;
2037
2038 svm = to_svm(vcpu);
2039
2040 if (vcpu->arch.guest_state_protected)
2041 sev_flush_guest_memory(svm, svm->vmsa, PAGE_SIZE);
2042 __free_page(virt_to_page(svm->vmsa));
2043
2044 if (svm->ghcb_sa_free)
2045 kfree(svm->ghcb_sa);
2046}
2047
2048static void dump_ghcb(struct vcpu_svm *svm)
2049{
2050 struct ghcb *ghcb = svm->ghcb;
2051 unsigned int nbits;
2052
2053
2054 if (!dump_invalid_vmcb) {
2055 pr_warn_ratelimited("set kvm_amd.dump_invalid_vmcb=1 to dump internal KVM state.\n");
2056 return;
2057 }
2058
2059 nbits = sizeof(ghcb->save.valid_bitmap) * 8;
2060
2061 pr_err("GHCB (GPA=%016llx):\n", svm->vmcb->control.ghcb_gpa);
2062 pr_err("%-20s%016llx is_valid: %u\n", "sw_exit_code",
2063 ghcb->save.sw_exit_code, ghcb_sw_exit_code_is_valid(ghcb));
2064 pr_err("%-20s%016llx is_valid: %u\n", "sw_exit_info_1",
2065 ghcb->save.sw_exit_info_1, ghcb_sw_exit_info_1_is_valid(ghcb));
2066 pr_err("%-20s%016llx is_valid: %u\n", "sw_exit_info_2",
2067 ghcb->save.sw_exit_info_2, ghcb_sw_exit_info_2_is_valid(ghcb));
2068 pr_err("%-20s%016llx is_valid: %u\n", "sw_scratch",
2069 ghcb->save.sw_scratch, ghcb_sw_scratch_is_valid(ghcb));
2070 pr_err("%-20s%*pb\n", "valid_bitmap", nbits, ghcb->save.valid_bitmap);
2071}
2072
2073static void sev_es_sync_to_ghcb(struct vcpu_svm *svm)
2074{
2075 struct kvm_vcpu *vcpu = &svm->vcpu;
2076 struct ghcb *ghcb = svm->ghcb;
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086 ghcb_set_rax(ghcb, vcpu->arch.regs[VCPU_REGS_RAX]);
2087 ghcb_set_rbx(ghcb, vcpu->arch.regs[VCPU_REGS_RBX]);
2088 ghcb_set_rcx(ghcb, vcpu->arch.regs[VCPU_REGS_RCX]);
2089 ghcb_set_rdx(ghcb, vcpu->arch.regs[VCPU_REGS_RDX]);
2090}
2091
2092static void sev_es_sync_from_ghcb(struct vcpu_svm *svm)
2093{
2094 struct vmcb_control_area *control = &svm->vmcb->control;
2095 struct kvm_vcpu *vcpu = &svm->vcpu;
2096 struct ghcb *ghcb = svm->ghcb;
2097 u64 exit_code;
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111 memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs));
2112
2113 vcpu->arch.regs[VCPU_REGS_RAX] = ghcb_get_rax_if_valid(ghcb);
2114 vcpu->arch.regs[VCPU_REGS_RBX] = ghcb_get_rbx_if_valid(ghcb);
2115 vcpu->arch.regs[VCPU_REGS_RCX] = ghcb_get_rcx_if_valid(ghcb);
2116 vcpu->arch.regs[VCPU_REGS_RDX] = ghcb_get_rdx_if_valid(ghcb);
2117 vcpu->arch.regs[VCPU_REGS_RSI] = ghcb_get_rsi_if_valid(ghcb);
2118
2119 svm->vmcb->save.cpl = ghcb_get_cpl_if_valid(ghcb);
2120
2121 if (ghcb_xcr0_is_valid(ghcb)) {
2122 vcpu->arch.xcr0 = ghcb_get_xcr0(ghcb);
2123 kvm_update_cpuid_runtime(vcpu);
2124 }
2125
2126
2127 exit_code = ghcb_get_sw_exit_code(ghcb);
2128 control->exit_code = lower_32_bits(exit_code);
2129 control->exit_code_hi = upper_32_bits(exit_code);
2130 control->exit_info_1 = ghcb_get_sw_exit_info_1(ghcb);
2131 control->exit_info_2 = ghcb_get_sw_exit_info_2(ghcb);
2132
2133
2134 memset(ghcb->save.valid_bitmap, 0, sizeof(ghcb->save.valid_bitmap));
2135}
2136
2137static int sev_es_validate_vmgexit(struct vcpu_svm *svm)
2138{
2139 struct kvm_vcpu *vcpu;
2140 struct ghcb *ghcb;
2141 u64 exit_code = 0;
2142
2143 ghcb = svm->ghcb;
2144
2145
2146 if (ghcb->ghcb_usage)
2147 goto vmgexit_err;
2148
2149
2150
2151
2152
2153 exit_code = ghcb_get_sw_exit_code(ghcb);
2154
2155 if (!ghcb_sw_exit_code_is_valid(ghcb) ||
2156 !ghcb_sw_exit_info_1_is_valid(ghcb) ||
2157 !ghcb_sw_exit_info_2_is_valid(ghcb))
2158 goto vmgexit_err;
2159
2160 switch (ghcb_get_sw_exit_code(ghcb)) {
2161 case SVM_EXIT_READ_DR7:
2162 break;
2163 case SVM_EXIT_WRITE_DR7:
2164 if (!ghcb_rax_is_valid(ghcb))
2165 goto vmgexit_err;
2166 break;
2167 case SVM_EXIT_RDTSC:
2168 break;
2169 case SVM_EXIT_RDPMC:
2170 if (!ghcb_rcx_is_valid(ghcb))
2171 goto vmgexit_err;
2172 break;
2173 case SVM_EXIT_CPUID:
2174 if (!ghcb_rax_is_valid(ghcb) ||
2175 !ghcb_rcx_is_valid(ghcb))
2176 goto vmgexit_err;
2177 if (ghcb_get_rax(ghcb) == 0xd)
2178 if (!ghcb_xcr0_is_valid(ghcb))
2179 goto vmgexit_err;
2180 break;
2181 case SVM_EXIT_INVD:
2182 break;
2183 case SVM_EXIT_IOIO:
2184 if (ghcb_get_sw_exit_info_1(ghcb) & SVM_IOIO_STR_MASK) {
2185 if (!ghcb_sw_scratch_is_valid(ghcb))
2186 goto vmgexit_err;
2187 } else {
2188 if (!(ghcb_get_sw_exit_info_1(ghcb) & SVM_IOIO_TYPE_MASK))
2189 if (!ghcb_rax_is_valid(ghcb))
2190 goto vmgexit_err;
2191 }
2192 break;
2193 case SVM_EXIT_MSR:
2194 if (!ghcb_rcx_is_valid(ghcb))
2195 goto vmgexit_err;
2196 if (ghcb_get_sw_exit_info_1(ghcb)) {
2197 if (!ghcb_rax_is_valid(ghcb) ||
2198 !ghcb_rdx_is_valid(ghcb))
2199 goto vmgexit_err;
2200 }
2201 break;
2202 case SVM_EXIT_VMMCALL:
2203 if (!ghcb_rax_is_valid(ghcb) ||
2204 !ghcb_cpl_is_valid(ghcb))
2205 goto vmgexit_err;
2206 break;
2207 case SVM_EXIT_RDTSCP:
2208 break;
2209 case SVM_EXIT_WBINVD:
2210 break;
2211 case SVM_EXIT_MONITOR:
2212 if (!ghcb_rax_is_valid(ghcb) ||
2213 !ghcb_rcx_is_valid(ghcb) ||
2214 !ghcb_rdx_is_valid(ghcb))
2215 goto vmgexit_err;
2216 break;
2217 case SVM_EXIT_MWAIT:
2218 if (!ghcb_rax_is_valid(ghcb) ||
2219 !ghcb_rcx_is_valid(ghcb))
2220 goto vmgexit_err;
2221 break;
2222 case SVM_VMGEXIT_MMIO_READ:
2223 case SVM_VMGEXIT_MMIO_WRITE:
2224 if (!ghcb_sw_scratch_is_valid(ghcb))
2225 goto vmgexit_err;
2226 break;
2227 case SVM_VMGEXIT_NMI_COMPLETE:
2228 case SVM_VMGEXIT_AP_HLT_LOOP:
2229 case SVM_VMGEXIT_AP_JUMP_TABLE:
2230 case SVM_VMGEXIT_UNSUPPORTED_EVENT:
2231 break;
2232 default:
2233 goto vmgexit_err;
2234 }
2235
2236 return 0;
2237
2238vmgexit_err:
2239 vcpu = &svm->vcpu;
2240
2241 if (ghcb->ghcb_usage) {
2242 vcpu_unimpl(vcpu, "vmgexit: ghcb usage %#x is not valid\n",
2243 ghcb->ghcb_usage);
2244 } else {
2245 vcpu_unimpl(vcpu, "vmgexit: exit reason %#llx is not valid\n",
2246 exit_code);
2247 dump_ghcb(svm);
2248 }
2249
2250 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
2251 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_UNEXPECTED_EXIT_REASON;
2252 vcpu->run->internal.ndata = 2;
2253 vcpu->run->internal.data[0] = exit_code;
2254 vcpu->run->internal.data[1] = vcpu->arch.last_vmentry_cpu;
2255
2256 return -EINVAL;
2257}
2258
2259void sev_es_unmap_ghcb(struct vcpu_svm *svm)
2260{
2261 if (!svm->ghcb)
2262 return;
2263
2264 if (svm->ghcb_sa_free) {
2265
2266
2267
2268
2269
2270 if (svm->ghcb_sa_sync) {
2271 kvm_write_guest(svm->vcpu.kvm,
2272 ghcb_get_sw_scratch(svm->ghcb),
2273 svm->ghcb_sa, svm->ghcb_sa_len);
2274 svm->ghcb_sa_sync = false;
2275 }
2276
2277 kfree(svm->ghcb_sa);
2278 svm->ghcb_sa = NULL;
2279 svm->ghcb_sa_free = false;
2280 }
2281
2282 trace_kvm_vmgexit_exit(svm->vcpu.vcpu_id, svm->ghcb);
2283
2284 sev_es_sync_to_ghcb(svm);
2285
2286 kvm_vcpu_unmap(&svm->vcpu, &svm->ghcb_map, true);
2287 svm->ghcb = NULL;
2288}
2289
2290void pre_sev_run(struct vcpu_svm *svm, int cpu)
2291{
2292 struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
2293 int asid = sev_get_asid(svm->vcpu.kvm);
2294
2295
2296 svm->asid = asid;
2297
2298
2299
2300
2301
2302
2303
2304 if (sd->sev_vmcbs[asid] == svm->vmcb &&
2305 svm->vcpu.arch.last_vmentry_cpu == cpu)
2306 return;
2307
2308 sd->sev_vmcbs[asid] = svm->vmcb;
2309 svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID;
2310 vmcb_mark_dirty(svm->vmcb, VMCB_ASID);
2311}
2312
2313#define GHCB_SCRATCH_AREA_LIMIT (16ULL * PAGE_SIZE)
2314static bool setup_vmgexit_scratch(struct vcpu_svm *svm, bool sync, u64 len)
2315{
2316 struct vmcb_control_area *control = &svm->vmcb->control;
2317 struct ghcb *ghcb = svm->ghcb;
2318 u64 ghcb_scratch_beg, ghcb_scratch_end;
2319 u64 scratch_gpa_beg, scratch_gpa_end;
2320 void *scratch_va;
2321
2322 scratch_gpa_beg = ghcb_get_sw_scratch(ghcb);
2323 if (!scratch_gpa_beg) {
2324 pr_err("vmgexit: scratch gpa not provided\n");
2325 return false;
2326 }
2327
2328 scratch_gpa_end = scratch_gpa_beg + len;
2329 if (scratch_gpa_end < scratch_gpa_beg) {
2330 pr_err("vmgexit: scratch length (%#llx) not valid for scratch address (%#llx)\n",
2331 len, scratch_gpa_beg);
2332 return false;
2333 }
2334
2335 if ((scratch_gpa_beg & PAGE_MASK) == control->ghcb_gpa) {
2336
2337 ghcb_scratch_beg = control->ghcb_gpa +
2338 offsetof(struct ghcb, shared_buffer);
2339 ghcb_scratch_end = control->ghcb_gpa +
2340 offsetof(struct ghcb, reserved_1);
2341
2342
2343
2344
2345
2346 if (scratch_gpa_beg < ghcb_scratch_beg ||
2347 scratch_gpa_end > ghcb_scratch_end) {
2348 pr_err("vmgexit: scratch area is outside of GHCB shared buffer area (%#llx - %#llx)\n",
2349 scratch_gpa_beg, scratch_gpa_end);
2350 return false;
2351 }
2352
2353 scratch_va = (void *)svm->ghcb;
2354 scratch_va += (scratch_gpa_beg - control->ghcb_gpa);
2355 } else {
2356
2357
2358
2359
2360 if (len > GHCB_SCRATCH_AREA_LIMIT) {
2361 pr_err("vmgexit: scratch area exceeds KVM limits (%#llx requested, %#llx limit)\n",
2362 len, GHCB_SCRATCH_AREA_LIMIT);
2363 return false;
2364 }
2365 scratch_va = kzalloc(len, GFP_KERNEL_ACCOUNT);
2366 if (!scratch_va)
2367 return false;
2368
2369 if (kvm_read_guest(svm->vcpu.kvm, scratch_gpa_beg, scratch_va, len)) {
2370
2371 pr_err("vmgexit: kvm_read_guest for scratch area failed\n");
2372
2373 kfree(scratch_va);
2374 return false;
2375 }
2376
2377
2378
2379
2380
2381
2382
2383 svm->ghcb_sa_sync = sync;
2384 svm->ghcb_sa_free = true;
2385 }
2386
2387 svm->ghcb_sa = scratch_va;
2388 svm->ghcb_sa_len = len;
2389
2390 return true;
2391}
2392
2393static void set_ghcb_msr_bits(struct vcpu_svm *svm, u64 value, u64 mask,
2394 unsigned int pos)
2395{
2396 svm->vmcb->control.ghcb_gpa &= ~(mask << pos);
2397 svm->vmcb->control.ghcb_gpa |= (value & mask) << pos;
2398}
2399
2400static u64 get_ghcb_msr_bits(struct vcpu_svm *svm, u64 mask, unsigned int pos)
2401{
2402 return (svm->vmcb->control.ghcb_gpa >> pos) & mask;
2403}
2404
2405static void set_ghcb_msr(struct vcpu_svm *svm, u64 value)
2406{
2407 svm->vmcb->control.ghcb_gpa = value;
2408}
2409
2410static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm)
2411{
2412 struct vmcb_control_area *control = &svm->vmcb->control;
2413 struct kvm_vcpu *vcpu = &svm->vcpu;
2414 u64 ghcb_info;
2415 int ret = 1;
2416
2417 ghcb_info = control->ghcb_gpa & GHCB_MSR_INFO_MASK;
2418
2419 trace_kvm_vmgexit_msr_protocol_enter(svm->vcpu.vcpu_id,
2420 control->ghcb_gpa);
2421
2422 switch (ghcb_info) {
2423 case GHCB_MSR_SEV_INFO_REQ:
2424 set_ghcb_msr(svm, GHCB_MSR_SEV_INFO(GHCB_VERSION_MAX,
2425 GHCB_VERSION_MIN,
2426 sev_enc_bit));
2427 break;
2428 case GHCB_MSR_CPUID_REQ: {
2429 u64 cpuid_fn, cpuid_reg, cpuid_value;
2430
2431 cpuid_fn = get_ghcb_msr_bits(svm,
2432 GHCB_MSR_CPUID_FUNC_MASK,
2433 GHCB_MSR_CPUID_FUNC_POS);
2434
2435
2436 vcpu->arch.regs[VCPU_REGS_RAX] = cpuid_fn;
2437 vcpu->arch.regs[VCPU_REGS_RCX] = 0;
2438
2439 ret = svm_invoke_exit_handler(vcpu, SVM_EXIT_CPUID);
2440 if (!ret) {
2441 ret = -EINVAL;
2442 break;
2443 }
2444
2445 cpuid_reg = get_ghcb_msr_bits(svm,
2446 GHCB_MSR_CPUID_REG_MASK,
2447 GHCB_MSR_CPUID_REG_POS);
2448 if (cpuid_reg == 0)
2449 cpuid_value = vcpu->arch.regs[VCPU_REGS_RAX];
2450 else if (cpuid_reg == 1)
2451 cpuid_value = vcpu->arch.regs[VCPU_REGS_RBX];
2452 else if (cpuid_reg == 2)
2453 cpuid_value = vcpu->arch.regs[VCPU_REGS_RCX];
2454 else
2455 cpuid_value = vcpu->arch.regs[VCPU_REGS_RDX];
2456
2457 set_ghcb_msr_bits(svm, cpuid_value,
2458 GHCB_MSR_CPUID_VALUE_MASK,
2459 GHCB_MSR_CPUID_VALUE_POS);
2460
2461 set_ghcb_msr_bits(svm, GHCB_MSR_CPUID_RESP,
2462 GHCB_MSR_INFO_MASK,
2463 GHCB_MSR_INFO_POS);
2464 break;
2465 }
2466 case GHCB_MSR_TERM_REQ: {
2467 u64 reason_set, reason_code;
2468
2469 reason_set = get_ghcb_msr_bits(svm,
2470 GHCB_MSR_TERM_REASON_SET_MASK,
2471 GHCB_MSR_TERM_REASON_SET_POS);
2472 reason_code = get_ghcb_msr_bits(svm,
2473 GHCB_MSR_TERM_REASON_MASK,
2474 GHCB_MSR_TERM_REASON_POS);
2475 pr_info("SEV-ES guest requested termination: %#llx:%#llx\n",
2476 reason_set, reason_code);
2477 fallthrough;
2478 }
2479 default:
2480 ret = -EINVAL;
2481 }
2482
2483 trace_kvm_vmgexit_msr_protocol_exit(svm->vcpu.vcpu_id,
2484 control->ghcb_gpa, ret);
2485
2486 return ret;
2487}
2488
2489int sev_handle_vmgexit(struct kvm_vcpu *vcpu)
2490{
2491 struct vcpu_svm *svm = to_svm(vcpu);
2492 struct vmcb_control_area *control = &svm->vmcb->control;
2493 u64 ghcb_gpa, exit_code;
2494 struct ghcb *ghcb;
2495 int ret;
2496
2497
2498 ghcb_gpa = control->ghcb_gpa;
2499 if (ghcb_gpa & GHCB_MSR_INFO_MASK)
2500 return sev_handle_vmgexit_msr_protocol(svm);
2501
2502 if (!ghcb_gpa) {
2503 vcpu_unimpl(vcpu, "vmgexit: GHCB gpa is not set\n");
2504 return -EINVAL;
2505 }
2506
2507 if (kvm_vcpu_map(vcpu, ghcb_gpa >> PAGE_SHIFT, &svm->ghcb_map)) {
2508
2509 vcpu_unimpl(vcpu, "vmgexit: error mapping GHCB [%#llx] from guest\n",
2510 ghcb_gpa);
2511 return -EINVAL;
2512 }
2513
2514 svm->ghcb = svm->ghcb_map.hva;
2515 ghcb = svm->ghcb_map.hva;
2516
2517 trace_kvm_vmgexit_enter(vcpu->vcpu_id, ghcb);
2518
2519 exit_code = ghcb_get_sw_exit_code(ghcb);
2520
2521 ret = sev_es_validate_vmgexit(svm);
2522 if (ret)
2523 return ret;
2524
2525 sev_es_sync_from_ghcb(svm);
2526 ghcb_set_sw_exit_info_1(ghcb, 0);
2527 ghcb_set_sw_exit_info_2(ghcb, 0);
2528
2529 ret = -EINVAL;
2530 switch (exit_code) {
2531 case SVM_VMGEXIT_MMIO_READ:
2532 if (!setup_vmgexit_scratch(svm, true, control->exit_info_2))
2533 break;
2534
2535 ret = kvm_sev_es_mmio_read(vcpu,
2536 control->exit_info_1,
2537 control->exit_info_2,
2538 svm->ghcb_sa);
2539 break;
2540 case SVM_VMGEXIT_MMIO_WRITE:
2541 if (!setup_vmgexit_scratch(svm, false, control->exit_info_2))
2542 break;
2543
2544 ret = kvm_sev_es_mmio_write(vcpu,
2545 control->exit_info_1,
2546 control->exit_info_2,
2547 svm->ghcb_sa);
2548 break;
2549 case SVM_VMGEXIT_NMI_COMPLETE:
2550 ret = svm_invoke_exit_handler(vcpu, SVM_EXIT_IRET);
2551 break;
2552 case SVM_VMGEXIT_AP_HLT_LOOP:
2553 ret = kvm_emulate_ap_reset_hold(vcpu);
2554 break;
2555 case SVM_VMGEXIT_AP_JUMP_TABLE: {
2556 struct kvm_sev_info *sev = &to_kvm_svm(vcpu->kvm)->sev_info;
2557
2558 switch (control->exit_info_1) {
2559 case 0:
2560
2561 sev->ap_jump_table = control->exit_info_2;
2562 break;
2563 case 1:
2564
2565 ghcb_set_sw_exit_info_2(ghcb, sev->ap_jump_table);
2566 break;
2567 default:
2568 pr_err("svm: vmgexit: unsupported AP jump table request - exit_info_1=%#llx\n",
2569 control->exit_info_1);
2570 ghcb_set_sw_exit_info_1(ghcb, 1);
2571 ghcb_set_sw_exit_info_2(ghcb,
2572 X86_TRAP_UD |
2573 SVM_EVTINJ_TYPE_EXEPT |
2574 SVM_EVTINJ_VALID);
2575 }
2576
2577 ret = 1;
2578 break;
2579 }
2580 case SVM_VMGEXIT_UNSUPPORTED_EVENT:
2581 vcpu_unimpl(vcpu,
2582 "vmgexit: unsupported event - exit_info_1=%#llx, exit_info_2=%#llx\n",
2583 control->exit_info_1, control->exit_info_2);
2584 break;
2585 default:
2586 ret = svm_invoke_exit_handler(vcpu, exit_code);
2587 }
2588
2589 return ret;
2590}
2591
2592int sev_es_string_io(struct vcpu_svm *svm, int size, unsigned int port, int in)
2593{
2594 int count;
2595 int bytes;
2596
2597 if (svm->vmcb->control.exit_info_2 > INT_MAX)
2598 return -EINVAL;
2599
2600 count = svm->vmcb->control.exit_info_2;
2601 if (unlikely(check_mul_overflow(count, size, &bytes)))
2602 return -EINVAL;
2603
2604 if (!setup_vmgexit_scratch(svm, in, bytes))
2605 return -EINVAL;
2606
2607 return kvm_sev_es_string_io(&svm->vcpu, size, port, svm->ghcb_sa, count, in);
2608}
2609
2610void sev_es_init_vmcb(struct vcpu_svm *svm)
2611{
2612 struct kvm_vcpu *vcpu = &svm->vcpu;
2613
2614 svm->vmcb->control.nested_ctl |= SVM_NESTED_CTL_SEV_ES_ENABLE;
2615 svm->vmcb->control.virt_ext |= LBR_CTL_ENABLE_MASK;
2616
2617
2618
2619
2620
2621
2622 svm->vmcb->control.vmsa_pa = __pa(svm->vmsa);
2623
2624
2625 svm_clr_intercept(svm, INTERCEPT_CR0_READ);
2626 svm_clr_intercept(svm, INTERCEPT_CR4_READ);
2627 svm_clr_intercept(svm, INTERCEPT_CR8_READ);
2628 svm_clr_intercept(svm, INTERCEPT_CR0_WRITE);
2629 svm_clr_intercept(svm, INTERCEPT_CR4_WRITE);
2630 svm_clr_intercept(svm, INTERCEPT_CR8_WRITE);
2631
2632 svm_clr_intercept(svm, INTERCEPT_SELECTIVE_CR0);
2633
2634
2635 svm_set_intercept(svm, TRAP_EFER_WRITE);
2636 svm_set_intercept(svm, TRAP_CR0_WRITE);
2637 svm_set_intercept(svm, TRAP_CR4_WRITE);
2638 svm_set_intercept(svm, TRAP_CR8_WRITE);
2639
2640
2641 clr_exception_intercept(svm, GP_VECTOR);
2642
2643
2644 svm_clr_intercept(svm, INTERCEPT_XSETBV);
2645
2646
2647 set_msr_interception(vcpu, svm->msrpm, MSR_EFER, 1, 1);
2648 set_msr_interception(vcpu, svm->msrpm, MSR_IA32_CR_PAT, 1, 1);
2649 set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
2650 set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
2651 set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
2652 set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
2653}
2654
2655void sev_es_create_vcpu(struct vcpu_svm *svm)
2656{
2657
2658
2659
2660
2661 set_ghcb_msr(svm, GHCB_MSR_SEV_INFO(GHCB_VERSION_MAX,
2662 GHCB_VERSION_MIN,
2663 sev_enc_bit));
2664}
2665
2666void sev_es_prepare_guest_switch(struct vcpu_svm *svm, unsigned int cpu)
2667{
2668 struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
2669 struct vmcb_save_area *hostsa;
2670
2671
2672
2673
2674
2675
2676 vmsave(__sme_page_pa(sd->save_area));
2677
2678
2679 hostsa = (struct vmcb_save_area *)(page_address(sd->save_area) + 0x400);
2680 hostsa->xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
2681
2682
2683 hostsa->pkru = read_pkru();
2684
2685
2686 hostsa->xss = host_xss;
2687}
2688
2689void sev_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
2690{
2691 struct vcpu_svm *svm = to_svm(vcpu);
2692
2693
2694 if (!svm->received_first_sipi) {
2695 svm->received_first_sipi = true;
2696 return;
2697 }
2698
2699
2700
2701
2702
2703
2704 if (!svm->ghcb)
2705 return;
2706
2707 ghcb_set_sw_exit_info_2(svm->ghcb, 1);
2708}
2709