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eaf78265 JR |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * Kernel-based Virtual Machine driver for Linux | |
4 | * | |
5 | * AMD SVM-SEV support | |
6 | * | |
7 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. | |
8 | */ | |
9 | ||
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> | |
b2bce0a5 | 15 | #include <linux/pagemap.h> |
eaf78265 | 16 | #include <linux/swap.h> |
add5e2f0 | 17 | #include <linux/processor.h> |
d523ab6b | 18 | #include <linux/trace_events.h> |
86137773 | 19 | #include <asm/fpu/internal.h> |
eaf78265 | 20 | |
8640ca58 TL |
21 | #include <asm/trapnr.h> |
22 | ||
eaf78265 JR |
23 | #include "x86.h" |
24 | #include "svm.h" | |
35a78319 | 25 | #include "svm_ops.h" |
291bd20d | 26 | #include "cpuid.h" |
d523ab6b | 27 | #include "trace.h" |
eaf78265 | 28 | |
86137773 TL |
29 | #define __ex(x) __kvm_handle_fault_on_reboot(x) |
30 | ||
1edc1459 | 31 | static u8 sev_enc_bit; |
eaf78265 JR |
32 | static int sev_flush_asids(void); |
33 | static DECLARE_RWSEM(sev_deactivate_lock); | |
34 | static DEFINE_MUTEX(sev_bitmap_lock); | |
35 | unsigned int max_sev_asid; | |
36 | static unsigned int min_sev_asid; | |
37 | static unsigned long *sev_asid_bitmap; | |
38 | static unsigned long *sev_reclaim_asid_bitmap; | |
eaf78265 JR |
39 | |
40 | struct enc_region { | |
41 | struct list_head list; | |
42 | unsigned long npages; | |
43 | struct page **pages; | |
44 | unsigned long uaddr; | |
45 | unsigned long size; | |
46 | }; | |
47 | ||
48 | static int sev_flush_asids(void) | |
49 | { | |
50 | int ret, error = 0; | |
51 | ||
52 | /* | |
53 | * DEACTIVATE will clear the WBINVD indicator causing DF_FLUSH to fail, | |
54 | * so it must be guarded. | |
55 | */ | |
56 | down_write(&sev_deactivate_lock); | |
57 | ||
58 | wbinvd_on_all_cpus(); | |
59 | ret = sev_guest_df_flush(&error); | |
60 | ||
61 | up_write(&sev_deactivate_lock); | |
62 | ||
63 | if (ret) | |
64 | pr_err("SEV: DF_FLUSH failed, ret=%d, error=%#x\n", ret, error); | |
65 | ||
66 | return ret; | |
67 | } | |
68 | ||
69 | /* Must be called with the sev_bitmap_lock held */ | |
80675b3a | 70 | static bool __sev_recycle_asids(int min_asid, int max_asid) |
eaf78265 JR |
71 | { |
72 | int pos; | |
73 | ||
74 | /* Check if there are any ASIDs to reclaim before performing a flush */ | |
80675b3a TL |
75 | pos = find_next_bit(sev_reclaim_asid_bitmap, max_sev_asid, min_asid); |
76 | if (pos >= max_asid) | |
eaf78265 JR |
77 | return false; |
78 | ||
79 | if (sev_flush_asids()) | |
80 | return false; | |
81 | ||
80675b3a | 82 | /* The flush process will flush all reclaimable SEV and SEV-ES ASIDs */ |
eaf78265 JR |
83 | bitmap_xor(sev_asid_bitmap, sev_asid_bitmap, sev_reclaim_asid_bitmap, |
84 | max_sev_asid); | |
85 | bitmap_zero(sev_reclaim_asid_bitmap, max_sev_asid); | |
86 | ||
87 | return true; | |
88 | } | |
89 | ||
9fa1521d | 90 | static int sev_asid_new(bool es_active) |
eaf78265 | 91 | { |
80675b3a | 92 | int pos, min_asid, max_asid; |
eaf78265 | 93 | bool retry = true; |
eaf78265 JR |
94 | |
95 | mutex_lock(&sev_bitmap_lock); | |
96 | ||
97 | /* | |
80675b3a TL |
98 | * SEV-enabled guests must use asid from min_sev_asid to max_sev_asid. |
99 | * SEV-ES-enabled guest can use from 1 to min_sev_asid - 1. | |
eaf78265 | 100 | */ |
9fa1521d SC |
101 | min_asid = es_active ? 0 : min_sev_asid - 1; |
102 | max_asid = es_active ? min_sev_asid - 1 : max_sev_asid; | |
eaf78265 | 103 | again: |
80675b3a TL |
104 | pos = find_next_zero_bit(sev_asid_bitmap, max_sev_asid, min_asid); |
105 | if (pos >= max_asid) { | |
106 | if (retry && __sev_recycle_asids(min_asid, max_asid)) { | |
eaf78265 JR |
107 | retry = false; |
108 | goto again; | |
109 | } | |
110 | mutex_unlock(&sev_bitmap_lock); | |
111 | return -EBUSY; | |
112 | } | |
113 | ||
114 | __set_bit(pos, sev_asid_bitmap); | |
115 | ||
116 | mutex_unlock(&sev_bitmap_lock); | |
117 | ||
118 | return pos + 1; | |
119 | } | |
120 | ||
121 | static int sev_get_asid(struct kvm *kvm) | |
122 | { | |
123 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
124 | ||
125 | return sev->asid; | |
126 | } | |
127 | ||
128 | static void sev_asid_free(int asid) | |
129 | { | |
130 | struct svm_cpu_data *sd; | |
131 | int cpu, pos; | |
132 | ||
133 | mutex_lock(&sev_bitmap_lock); | |
134 | ||
135 | pos = asid - 1; | |
136 | __set_bit(pos, sev_reclaim_asid_bitmap); | |
137 | ||
138 | for_each_possible_cpu(cpu) { | |
139 | sd = per_cpu(svm_data, cpu); | |
140 | sd->sev_vmcbs[pos] = NULL; | |
141 | } | |
142 | ||
143 | mutex_unlock(&sev_bitmap_lock); | |
144 | } | |
145 | ||
146 | static void sev_unbind_asid(struct kvm *kvm, unsigned int handle) | |
147 | { | |
148 | struct sev_data_decommission *decommission; | |
149 | struct sev_data_deactivate *data; | |
150 | ||
151 | if (!handle) | |
152 | return; | |
153 | ||
154 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
155 | if (!data) | |
156 | return; | |
157 | ||
158 | /* deactivate handle */ | |
159 | data->handle = handle; | |
160 | ||
161 | /* Guard DEACTIVATE against WBINVD/DF_FLUSH used in ASID recycling */ | |
162 | down_read(&sev_deactivate_lock); | |
163 | sev_guest_deactivate(data, NULL); | |
164 | up_read(&sev_deactivate_lock); | |
165 | ||
166 | kfree(data); | |
167 | ||
168 | decommission = kzalloc(sizeof(*decommission), GFP_KERNEL); | |
169 | if (!decommission) | |
170 | return; | |
171 | ||
172 | /* decommission handle */ | |
173 | decommission->handle = handle; | |
174 | sev_guest_decommission(decommission, NULL); | |
175 | ||
176 | kfree(decommission); | |
177 | } | |
178 | ||
179 | static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
180 | { | |
181 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
9fa1521d | 182 | bool es_active = argp->id == KVM_SEV_ES_INIT; |
eaf78265 JR |
183 | int asid, ret; |
184 | ||
8727906f SC |
185 | if (kvm->created_vcpus) |
186 | return -EINVAL; | |
187 | ||
eaf78265 JR |
188 | ret = -EBUSY; |
189 | if (unlikely(sev->active)) | |
190 | return ret; | |
191 | ||
9fa1521d | 192 | asid = sev_asid_new(es_active); |
eaf78265 JR |
193 | if (asid < 0) |
194 | return ret; | |
195 | ||
196 | ret = sev_platform_init(&argp->error); | |
197 | if (ret) | |
198 | goto e_free; | |
199 | ||
200 | sev->active = true; | |
9fa1521d | 201 | sev->es_active = es_active; |
eaf78265 JR |
202 | sev->asid = asid; |
203 | INIT_LIST_HEAD(&sev->regions_list); | |
204 | ||
205 | return 0; | |
206 | ||
207 | e_free: | |
208 | sev_asid_free(asid); | |
209 | return ret; | |
210 | } | |
211 | ||
212 | static int sev_bind_asid(struct kvm *kvm, unsigned int handle, int *error) | |
213 | { | |
214 | struct sev_data_activate *data; | |
215 | int asid = sev_get_asid(kvm); | |
216 | int ret; | |
217 | ||
218 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
219 | if (!data) | |
220 | return -ENOMEM; | |
221 | ||
222 | /* activate ASID on the given handle */ | |
223 | data->handle = handle; | |
224 | data->asid = asid; | |
225 | ret = sev_guest_activate(data, error); | |
226 | kfree(data); | |
227 | ||
228 | return ret; | |
229 | } | |
230 | ||
231 | static int __sev_issue_cmd(int fd, int id, void *data, int *error) | |
232 | { | |
233 | struct fd f; | |
234 | int ret; | |
235 | ||
236 | f = fdget(fd); | |
237 | if (!f.file) | |
238 | return -EBADF; | |
239 | ||
240 | ret = sev_issue_cmd_external_user(f.file, id, data, error); | |
241 | ||
242 | fdput(f); | |
243 | return ret; | |
244 | } | |
245 | ||
246 | static int sev_issue_cmd(struct kvm *kvm, int id, void *data, int *error) | |
247 | { | |
248 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
249 | ||
250 | return __sev_issue_cmd(sev->fd, id, data, error); | |
251 | } | |
252 | ||
253 | static int sev_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
254 | { | |
255 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
256 | struct sev_data_launch_start *start; | |
257 | struct kvm_sev_launch_start params; | |
258 | void *dh_blob, *session_blob; | |
259 | int *error = &argp->error; | |
260 | int ret; | |
261 | ||
262 | if (!sev_guest(kvm)) | |
263 | return -ENOTTY; | |
264 | ||
265 | if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) | |
266 | return -EFAULT; | |
267 | ||
268 | start = kzalloc(sizeof(*start), GFP_KERNEL_ACCOUNT); | |
269 | if (!start) | |
270 | return -ENOMEM; | |
271 | ||
272 | dh_blob = NULL; | |
273 | if (params.dh_uaddr) { | |
274 | dh_blob = psp_copy_user_blob(params.dh_uaddr, params.dh_len); | |
275 | if (IS_ERR(dh_blob)) { | |
276 | ret = PTR_ERR(dh_blob); | |
277 | goto e_free; | |
278 | } | |
279 | ||
280 | start->dh_cert_address = __sme_set(__pa(dh_blob)); | |
281 | start->dh_cert_len = params.dh_len; | |
282 | } | |
283 | ||
284 | session_blob = NULL; | |
285 | if (params.session_uaddr) { | |
286 | session_blob = psp_copy_user_blob(params.session_uaddr, params.session_len); | |
287 | if (IS_ERR(session_blob)) { | |
288 | ret = PTR_ERR(session_blob); | |
289 | goto e_free_dh; | |
290 | } | |
291 | ||
292 | start->session_address = __sme_set(__pa(session_blob)); | |
293 | start->session_len = params.session_len; | |
294 | } | |
295 | ||
296 | start->handle = params.handle; | |
297 | start->policy = params.policy; | |
298 | ||
299 | /* create memory encryption context */ | |
300 | ret = __sev_issue_cmd(argp->sev_fd, SEV_CMD_LAUNCH_START, start, error); | |
301 | if (ret) | |
302 | goto e_free_session; | |
303 | ||
304 | /* Bind ASID to this guest */ | |
305 | ret = sev_bind_asid(kvm, start->handle, error); | |
306 | if (ret) | |
307 | goto e_free_session; | |
308 | ||
309 | /* return handle to userspace */ | |
310 | params.handle = start->handle; | |
311 | if (copy_to_user((void __user *)(uintptr_t)argp->data, ¶ms, sizeof(params))) { | |
312 | sev_unbind_asid(kvm, start->handle); | |
313 | ret = -EFAULT; | |
314 | goto e_free_session; | |
315 | } | |
316 | ||
317 | sev->handle = start->handle; | |
318 | sev->fd = argp->sev_fd; | |
319 | ||
320 | e_free_session: | |
321 | kfree(session_blob); | |
322 | e_free_dh: | |
323 | kfree(dh_blob); | |
324 | e_free: | |
325 | kfree(start); | |
326 | return ret; | |
327 | } | |
328 | ||
329 | static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr, | |
330 | unsigned long ulen, unsigned long *n, | |
331 | int write) | |
332 | { | |
333 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
78824fab JH |
334 | unsigned long npages, size; |
335 | int npinned; | |
eaf78265 JR |
336 | unsigned long locked, lock_limit; |
337 | struct page **pages; | |
338 | unsigned long first, last; | |
ff2bd9ff | 339 | int ret; |
eaf78265 | 340 | |
19a23da5 PG |
341 | lockdep_assert_held(&kvm->lock); |
342 | ||
eaf78265 | 343 | if (ulen == 0 || uaddr + ulen < uaddr) |
a8d908b5 | 344 | return ERR_PTR(-EINVAL); |
eaf78265 JR |
345 | |
346 | /* Calculate number of pages. */ | |
347 | first = (uaddr & PAGE_MASK) >> PAGE_SHIFT; | |
348 | last = ((uaddr + ulen - 1) & PAGE_MASK) >> PAGE_SHIFT; | |
349 | npages = (last - first + 1); | |
350 | ||
351 | locked = sev->pages_locked + npages; | |
352 | lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
353 | if (locked > lock_limit && !capable(CAP_IPC_LOCK)) { | |
354 | pr_err("SEV: %lu locked pages exceed the lock limit of %lu.\n", locked, lock_limit); | |
a8d908b5 | 355 | return ERR_PTR(-ENOMEM); |
eaf78265 JR |
356 | } |
357 | ||
78824fab | 358 | if (WARN_ON_ONCE(npages > INT_MAX)) |
a8d908b5 | 359 | return ERR_PTR(-EINVAL); |
78824fab | 360 | |
eaf78265 JR |
361 | /* Avoid using vmalloc for smaller buffers. */ |
362 | size = npages * sizeof(struct page *); | |
363 | if (size > PAGE_SIZE) | |
88dca4ca | 364 | pages = __vmalloc(size, GFP_KERNEL_ACCOUNT | __GFP_ZERO); |
eaf78265 JR |
365 | else |
366 | pages = kmalloc(size, GFP_KERNEL_ACCOUNT); | |
367 | ||
368 | if (!pages) | |
a8d908b5 | 369 | return ERR_PTR(-ENOMEM); |
eaf78265 JR |
370 | |
371 | /* Pin the user virtual address. */ | |
dc42c8ae | 372 | npinned = pin_user_pages_fast(uaddr, npages, write ? FOLL_WRITE : 0, pages); |
eaf78265 JR |
373 | if (npinned != npages) { |
374 | pr_err("SEV: Failure locking %lu pages.\n", npages); | |
ff2bd9ff | 375 | ret = -ENOMEM; |
eaf78265 JR |
376 | goto err; |
377 | } | |
378 | ||
379 | *n = npages; | |
380 | sev->pages_locked = locked; | |
381 | ||
382 | return pages; | |
383 | ||
384 | err: | |
ff2bd9ff | 385 | if (npinned > 0) |
dc42c8ae | 386 | unpin_user_pages(pages, npinned); |
eaf78265 JR |
387 | |
388 | kvfree(pages); | |
ff2bd9ff | 389 | return ERR_PTR(ret); |
eaf78265 JR |
390 | } |
391 | ||
392 | static void sev_unpin_memory(struct kvm *kvm, struct page **pages, | |
393 | unsigned long npages) | |
394 | { | |
395 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
396 | ||
dc42c8ae | 397 | unpin_user_pages(pages, npages); |
eaf78265 JR |
398 | kvfree(pages); |
399 | sev->pages_locked -= npages; | |
400 | } | |
401 | ||
402 | static void sev_clflush_pages(struct page *pages[], unsigned long npages) | |
403 | { | |
404 | uint8_t *page_virtual; | |
405 | unsigned long i; | |
406 | ||
e1ebb2b4 KS |
407 | if (this_cpu_has(X86_FEATURE_SME_COHERENT) || npages == 0 || |
408 | pages == NULL) | |
eaf78265 JR |
409 | return; |
410 | ||
411 | for (i = 0; i < npages; i++) { | |
412 | page_virtual = kmap_atomic(pages[i]); | |
413 | clflush_cache_range(page_virtual, PAGE_SIZE); | |
414 | kunmap_atomic(page_virtual); | |
415 | } | |
416 | } | |
417 | ||
418 | static unsigned long get_num_contig_pages(unsigned long idx, | |
419 | struct page **inpages, unsigned long npages) | |
420 | { | |
421 | unsigned long paddr, next_paddr; | |
422 | unsigned long i = idx + 1, pages = 1; | |
423 | ||
424 | /* find the number of contiguous pages starting from idx */ | |
425 | paddr = __sme_page_pa(inpages[idx]); | |
426 | while (i < npages) { | |
427 | next_paddr = __sme_page_pa(inpages[i++]); | |
428 | if ((paddr + PAGE_SIZE) == next_paddr) { | |
429 | pages++; | |
430 | paddr = next_paddr; | |
431 | continue; | |
432 | } | |
433 | break; | |
434 | } | |
435 | ||
436 | return pages; | |
437 | } | |
438 | ||
439 | static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
440 | { | |
441 | unsigned long vaddr, vaddr_end, next_vaddr, npages, pages, size, i; | |
442 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
443 | struct kvm_sev_launch_update_data params; | |
444 | struct sev_data_launch_update_data *data; | |
445 | struct page **inpages; | |
446 | int ret; | |
447 | ||
448 | if (!sev_guest(kvm)) | |
449 | return -ENOTTY; | |
450 | ||
451 | if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) | |
452 | return -EFAULT; | |
453 | ||
454 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
455 | if (!data) | |
456 | return -ENOMEM; | |
457 | ||
458 | vaddr = params.uaddr; | |
459 | size = params.len; | |
460 | vaddr_end = vaddr + size; | |
461 | ||
462 | /* Lock the user memory. */ | |
463 | inpages = sev_pin_memory(kvm, vaddr, size, &npages, 1); | |
ff2bd9ff DC |
464 | if (IS_ERR(inpages)) { |
465 | ret = PTR_ERR(inpages); | |
eaf78265 JR |
466 | goto e_free; |
467 | } | |
468 | ||
469 | /* | |
14e3dd8d PB |
470 | * Flush (on non-coherent CPUs) before LAUNCH_UPDATE encrypts pages in |
471 | * place; the cache may contain the data that was written unencrypted. | |
eaf78265 JR |
472 | */ |
473 | sev_clflush_pages(inpages, npages); | |
474 | ||
475 | for (i = 0; vaddr < vaddr_end; vaddr = next_vaddr, i += pages) { | |
476 | int offset, len; | |
477 | ||
478 | /* | |
479 | * If the user buffer is not page-aligned, calculate the offset | |
480 | * within the page. | |
481 | */ | |
482 | offset = vaddr & (PAGE_SIZE - 1); | |
483 | ||
484 | /* Calculate the number of pages that can be encrypted in one go. */ | |
485 | pages = get_num_contig_pages(i, inpages, npages); | |
486 | ||
487 | len = min_t(size_t, ((pages * PAGE_SIZE) - offset), size); | |
488 | ||
489 | data->handle = sev->handle; | |
490 | data->len = len; | |
491 | data->address = __sme_page_pa(inpages[i]) + offset; | |
492 | ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_DATA, data, &argp->error); | |
493 | if (ret) | |
494 | goto e_unpin; | |
495 | ||
496 | size -= len; | |
497 | next_vaddr = vaddr + len; | |
498 | } | |
499 | ||
500 | e_unpin: | |
501 | /* content of memory is updated, mark pages dirty */ | |
502 | for (i = 0; i < npages; i++) { | |
503 | set_page_dirty_lock(inpages[i]); | |
504 | mark_page_accessed(inpages[i]); | |
505 | } | |
506 | /* unlock the user pages */ | |
507 | sev_unpin_memory(kvm, inpages, npages); | |
508 | e_free: | |
509 | kfree(data); | |
510 | return ret; | |
511 | } | |
512 | ||
ad73109a TL |
513 | static int sev_es_sync_vmsa(struct vcpu_svm *svm) |
514 | { | |
515 | struct vmcb_save_area *save = &svm->vmcb->save; | |
516 | ||
517 | /* Check some debug related fields before encrypting the VMSA */ | |
518 | if (svm->vcpu.guest_debug || (save->dr7 & ~DR7_FIXED_1)) | |
519 | return -EINVAL; | |
520 | ||
521 | /* Sync registgers */ | |
522 | save->rax = svm->vcpu.arch.regs[VCPU_REGS_RAX]; | |
523 | save->rbx = svm->vcpu.arch.regs[VCPU_REGS_RBX]; | |
524 | save->rcx = svm->vcpu.arch.regs[VCPU_REGS_RCX]; | |
525 | save->rdx = svm->vcpu.arch.regs[VCPU_REGS_RDX]; | |
526 | save->rsp = svm->vcpu.arch.regs[VCPU_REGS_RSP]; | |
527 | save->rbp = svm->vcpu.arch.regs[VCPU_REGS_RBP]; | |
528 | save->rsi = svm->vcpu.arch.regs[VCPU_REGS_RSI]; | |
529 | save->rdi = svm->vcpu.arch.regs[VCPU_REGS_RDI]; | |
d45f89f7 | 530 | #ifdef CONFIG_X86_64 |
ad73109a TL |
531 | save->r8 = svm->vcpu.arch.regs[VCPU_REGS_R8]; |
532 | save->r9 = svm->vcpu.arch.regs[VCPU_REGS_R9]; | |
533 | save->r10 = svm->vcpu.arch.regs[VCPU_REGS_R10]; | |
534 | save->r11 = svm->vcpu.arch.regs[VCPU_REGS_R11]; | |
535 | save->r12 = svm->vcpu.arch.regs[VCPU_REGS_R12]; | |
536 | save->r13 = svm->vcpu.arch.regs[VCPU_REGS_R13]; | |
537 | save->r14 = svm->vcpu.arch.regs[VCPU_REGS_R14]; | |
538 | save->r15 = svm->vcpu.arch.regs[VCPU_REGS_R15]; | |
d45f89f7 | 539 | #endif |
ad73109a TL |
540 | save->rip = svm->vcpu.arch.regs[VCPU_REGS_RIP]; |
541 | ||
542 | /* Sync some non-GPR registers before encrypting */ | |
543 | save->xcr0 = svm->vcpu.arch.xcr0; | |
544 | save->pkru = svm->vcpu.arch.pkru; | |
545 | save->xss = svm->vcpu.arch.ia32_xss; | |
546 | ||
547 | /* | |
548 | * SEV-ES will use a VMSA that is pointed to by the VMCB, not | |
549 | * the traditional VMSA that is part of the VMCB. Copy the | |
550 | * traditional VMSA as it has been built so far (in prep | |
551 | * for LAUNCH_UPDATE_VMSA) to be the initial SEV-ES state. | |
552 | */ | |
553 | memcpy(svm->vmsa, save, sizeof(*save)); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | static int sev_launch_update_vmsa(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
559 | { | |
560 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
561 | struct sev_data_launch_update_vmsa *vmsa; | |
c36b16d2 | 562 | struct kvm_vcpu *vcpu; |
ad73109a TL |
563 | int i, ret; |
564 | ||
565 | if (!sev_es_guest(kvm)) | |
566 | return -ENOTTY; | |
567 | ||
568 | vmsa = kzalloc(sizeof(*vmsa), GFP_KERNEL); | |
569 | if (!vmsa) | |
570 | return -ENOMEM; | |
571 | ||
c36b16d2 SC |
572 | kvm_for_each_vcpu(i, vcpu, kvm) { |
573 | struct vcpu_svm *svm = to_svm(vcpu); | |
ad73109a TL |
574 | |
575 | /* Perform some pre-encryption checks against the VMSA */ | |
576 | ret = sev_es_sync_vmsa(svm); | |
577 | if (ret) | |
578 | goto e_free; | |
579 | ||
580 | /* | |
581 | * The LAUNCH_UPDATE_VMSA command will perform in-place | |
582 | * encryption of the VMSA memory content (i.e it will write | |
583 | * the same memory region with the guest's key), so invalidate | |
584 | * it first. | |
585 | */ | |
586 | clflush_cache_range(svm->vmsa, PAGE_SIZE); | |
587 | ||
588 | vmsa->handle = sev->handle; | |
589 | vmsa->address = __sme_pa(svm->vmsa); | |
590 | vmsa->len = PAGE_SIZE; | |
591 | ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_VMSA, vmsa, | |
592 | &argp->error); | |
593 | if (ret) | |
594 | goto e_free; | |
595 | ||
596 | svm->vcpu.arch.guest_state_protected = true; | |
597 | } | |
598 | ||
599 | e_free: | |
600 | kfree(vmsa); | |
601 | return ret; | |
602 | } | |
603 | ||
eaf78265 JR |
604 | static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp) |
605 | { | |
606 | void __user *measure = (void __user *)(uintptr_t)argp->data; | |
607 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
608 | struct sev_data_launch_measure *data; | |
609 | struct kvm_sev_launch_measure params; | |
610 | void __user *p = NULL; | |
611 | void *blob = NULL; | |
612 | int ret; | |
613 | ||
614 | if (!sev_guest(kvm)) | |
615 | return -ENOTTY; | |
616 | ||
617 | if (copy_from_user(¶ms, measure, sizeof(params))) | |
618 | return -EFAULT; | |
619 | ||
620 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
621 | if (!data) | |
622 | return -ENOMEM; | |
623 | ||
624 | /* User wants to query the blob length */ | |
625 | if (!params.len) | |
626 | goto cmd; | |
627 | ||
628 | p = (void __user *)(uintptr_t)params.uaddr; | |
629 | if (p) { | |
630 | if (params.len > SEV_FW_BLOB_MAX_SIZE) { | |
631 | ret = -EINVAL; | |
632 | goto e_free; | |
633 | } | |
634 | ||
635 | ret = -ENOMEM; | |
636 | blob = kmalloc(params.len, GFP_KERNEL); | |
637 | if (!blob) | |
638 | goto e_free; | |
639 | ||
640 | data->address = __psp_pa(blob); | |
641 | data->len = params.len; | |
642 | } | |
643 | ||
644 | cmd: | |
645 | data->handle = sev->handle; | |
646 | ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_MEASURE, data, &argp->error); | |
647 | ||
648 | /* | |
649 | * If we query the session length, FW responded with expected data. | |
650 | */ | |
651 | if (!params.len) | |
652 | goto done; | |
653 | ||
654 | if (ret) | |
655 | goto e_free_blob; | |
656 | ||
657 | if (blob) { | |
658 | if (copy_to_user(p, blob, params.len)) | |
659 | ret = -EFAULT; | |
660 | } | |
661 | ||
662 | done: | |
663 | params.len = data->len; | |
664 | if (copy_to_user(measure, ¶ms, sizeof(params))) | |
665 | ret = -EFAULT; | |
666 | e_free_blob: | |
667 | kfree(blob); | |
668 | e_free: | |
669 | kfree(data); | |
670 | return ret; | |
671 | } | |
672 | ||
673 | static int sev_launch_finish(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
674 | { | |
675 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
676 | struct sev_data_launch_finish *data; | |
677 | int ret; | |
678 | ||
679 | if (!sev_guest(kvm)) | |
680 | return -ENOTTY; | |
681 | ||
682 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
683 | if (!data) | |
684 | return -ENOMEM; | |
685 | ||
686 | data->handle = sev->handle; | |
687 | ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_FINISH, data, &argp->error); | |
688 | ||
689 | kfree(data); | |
690 | return ret; | |
691 | } | |
692 | ||
693 | static int sev_guest_status(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
694 | { | |
695 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
696 | struct kvm_sev_guest_status params; | |
697 | struct sev_data_guest_status *data; | |
698 | int ret; | |
699 | ||
700 | if (!sev_guest(kvm)) | |
701 | return -ENOTTY; | |
702 | ||
703 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
704 | if (!data) | |
705 | return -ENOMEM; | |
706 | ||
707 | data->handle = sev->handle; | |
708 | ret = sev_issue_cmd(kvm, SEV_CMD_GUEST_STATUS, data, &argp->error); | |
709 | if (ret) | |
710 | goto e_free; | |
711 | ||
712 | params.policy = data->policy; | |
713 | params.state = data->state; | |
714 | params.handle = data->handle; | |
715 | ||
716 | if (copy_to_user((void __user *)(uintptr_t)argp->data, ¶ms, sizeof(params))) | |
717 | ret = -EFAULT; | |
718 | e_free: | |
719 | kfree(data); | |
720 | return ret; | |
721 | } | |
722 | ||
723 | static int __sev_issue_dbg_cmd(struct kvm *kvm, unsigned long src, | |
724 | unsigned long dst, int size, | |
725 | int *error, bool enc) | |
726 | { | |
727 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
728 | struct sev_data_dbg *data; | |
729 | int ret; | |
730 | ||
731 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
732 | if (!data) | |
733 | return -ENOMEM; | |
734 | ||
735 | data->handle = sev->handle; | |
736 | data->dst_addr = dst; | |
737 | data->src_addr = src; | |
738 | data->len = size; | |
739 | ||
740 | ret = sev_issue_cmd(kvm, | |
741 | enc ? SEV_CMD_DBG_ENCRYPT : SEV_CMD_DBG_DECRYPT, | |
742 | data, error); | |
743 | kfree(data); | |
744 | return ret; | |
745 | } | |
746 | ||
747 | static int __sev_dbg_decrypt(struct kvm *kvm, unsigned long src_paddr, | |
748 | unsigned long dst_paddr, int sz, int *err) | |
749 | { | |
750 | int offset; | |
751 | ||
752 | /* | |
753 | * Its safe to read more than we are asked, caller should ensure that | |
754 | * destination has enough space. | |
755 | */ | |
eaf78265 | 756 | offset = src_paddr & 15; |
854c57f0 | 757 | src_paddr = round_down(src_paddr, 16); |
eaf78265 JR |
758 | sz = round_up(sz + offset, 16); |
759 | ||
760 | return __sev_issue_dbg_cmd(kvm, src_paddr, dst_paddr, sz, err, false); | |
761 | } | |
762 | ||
763 | static int __sev_dbg_decrypt_user(struct kvm *kvm, unsigned long paddr, | |
764 | unsigned long __user dst_uaddr, | |
765 | unsigned long dst_paddr, | |
766 | int size, int *err) | |
767 | { | |
768 | struct page *tpage = NULL; | |
769 | int ret, offset; | |
770 | ||
771 | /* if inputs are not 16-byte then use intermediate buffer */ | |
772 | if (!IS_ALIGNED(dst_paddr, 16) || | |
773 | !IS_ALIGNED(paddr, 16) || | |
774 | !IS_ALIGNED(size, 16)) { | |
775 | tpage = (void *)alloc_page(GFP_KERNEL); | |
776 | if (!tpage) | |
777 | return -ENOMEM; | |
778 | ||
779 | dst_paddr = __sme_page_pa(tpage); | |
780 | } | |
781 | ||
782 | ret = __sev_dbg_decrypt(kvm, paddr, dst_paddr, size, err); | |
783 | if (ret) | |
784 | goto e_free; | |
785 | ||
786 | if (tpage) { | |
787 | offset = paddr & 15; | |
788 | if (copy_to_user((void __user *)(uintptr_t)dst_uaddr, | |
789 | page_address(tpage) + offset, size)) | |
790 | ret = -EFAULT; | |
791 | } | |
792 | ||
793 | e_free: | |
794 | if (tpage) | |
795 | __free_page(tpage); | |
796 | ||
797 | return ret; | |
798 | } | |
799 | ||
800 | static int __sev_dbg_encrypt_user(struct kvm *kvm, unsigned long paddr, | |
801 | unsigned long __user vaddr, | |
802 | unsigned long dst_paddr, | |
803 | unsigned long __user dst_vaddr, | |
804 | int size, int *error) | |
805 | { | |
806 | struct page *src_tpage = NULL; | |
807 | struct page *dst_tpage = NULL; | |
808 | int ret, len = size; | |
809 | ||
810 | /* If source buffer is not aligned then use an intermediate buffer */ | |
811 | if (!IS_ALIGNED(vaddr, 16)) { | |
812 | src_tpage = alloc_page(GFP_KERNEL); | |
813 | if (!src_tpage) | |
814 | return -ENOMEM; | |
815 | ||
816 | if (copy_from_user(page_address(src_tpage), | |
817 | (void __user *)(uintptr_t)vaddr, size)) { | |
818 | __free_page(src_tpage); | |
819 | return -EFAULT; | |
820 | } | |
821 | ||
822 | paddr = __sme_page_pa(src_tpage); | |
823 | } | |
824 | ||
825 | /* | |
826 | * If destination buffer or length is not aligned then do read-modify-write: | |
827 | * - decrypt destination in an intermediate buffer | |
828 | * - copy the source buffer in an intermediate buffer | |
829 | * - use the intermediate buffer as source buffer | |
830 | */ | |
831 | if (!IS_ALIGNED(dst_vaddr, 16) || !IS_ALIGNED(size, 16)) { | |
832 | int dst_offset; | |
833 | ||
834 | dst_tpage = alloc_page(GFP_KERNEL); | |
835 | if (!dst_tpage) { | |
836 | ret = -ENOMEM; | |
837 | goto e_free; | |
838 | } | |
839 | ||
840 | ret = __sev_dbg_decrypt(kvm, dst_paddr, | |
841 | __sme_page_pa(dst_tpage), size, error); | |
842 | if (ret) | |
843 | goto e_free; | |
844 | ||
845 | /* | |
846 | * If source is kernel buffer then use memcpy() otherwise | |
847 | * copy_from_user(). | |
848 | */ | |
849 | dst_offset = dst_paddr & 15; | |
850 | ||
851 | if (src_tpage) | |
852 | memcpy(page_address(dst_tpage) + dst_offset, | |
853 | page_address(src_tpage), size); | |
854 | else { | |
855 | if (copy_from_user(page_address(dst_tpage) + dst_offset, | |
856 | (void __user *)(uintptr_t)vaddr, size)) { | |
857 | ret = -EFAULT; | |
858 | goto e_free; | |
859 | } | |
860 | } | |
861 | ||
862 | paddr = __sme_page_pa(dst_tpage); | |
863 | dst_paddr = round_down(dst_paddr, 16); | |
864 | len = round_up(size, 16); | |
865 | } | |
866 | ||
867 | ret = __sev_issue_dbg_cmd(kvm, paddr, dst_paddr, len, error, true); | |
868 | ||
869 | e_free: | |
870 | if (src_tpage) | |
871 | __free_page(src_tpage); | |
872 | if (dst_tpage) | |
873 | __free_page(dst_tpage); | |
874 | return ret; | |
875 | } | |
876 | ||
877 | static int sev_dbg_crypt(struct kvm *kvm, struct kvm_sev_cmd *argp, bool dec) | |
878 | { | |
879 | unsigned long vaddr, vaddr_end, next_vaddr; | |
880 | unsigned long dst_vaddr; | |
881 | struct page **src_p, **dst_p; | |
882 | struct kvm_sev_dbg debug; | |
883 | unsigned long n; | |
884 | unsigned int size; | |
885 | int ret; | |
886 | ||
887 | if (!sev_guest(kvm)) | |
888 | return -ENOTTY; | |
889 | ||
890 | if (copy_from_user(&debug, (void __user *)(uintptr_t)argp->data, sizeof(debug))) | |
891 | return -EFAULT; | |
892 | ||
893 | if (!debug.len || debug.src_uaddr + debug.len < debug.src_uaddr) | |
894 | return -EINVAL; | |
895 | if (!debug.dst_uaddr) | |
896 | return -EINVAL; | |
897 | ||
898 | vaddr = debug.src_uaddr; | |
899 | size = debug.len; | |
900 | vaddr_end = vaddr + size; | |
901 | dst_vaddr = debug.dst_uaddr; | |
902 | ||
903 | for (; vaddr < vaddr_end; vaddr = next_vaddr) { | |
904 | int len, s_off, d_off; | |
905 | ||
906 | /* lock userspace source and destination page */ | |
907 | src_p = sev_pin_memory(kvm, vaddr & PAGE_MASK, PAGE_SIZE, &n, 0); | |
ff2bd9ff DC |
908 | if (IS_ERR(src_p)) |
909 | return PTR_ERR(src_p); | |
eaf78265 JR |
910 | |
911 | dst_p = sev_pin_memory(kvm, dst_vaddr & PAGE_MASK, PAGE_SIZE, &n, 1); | |
ff2bd9ff | 912 | if (IS_ERR(dst_p)) { |
eaf78265 | 913 | sev_unpin_memory(kvm, src_p, n); |
ff2bd9ff | 914 | return PTR_ERR(dst_p); |
eaf78265 JR |
915 | } |
916 | ||
917 | /* | |
14e3dd8d PB |
918 | * Flush (on non-coherent CPUs) before DBG_{DE,EN}CRYPT read or modify |
919 | * the pages; flush the destination too so that future accesses do not | |
920 | * see stale data. | |
eaf78265 JR |
921 | */ |
922 | sev_clflush_pages(src_p, 1); | |
923 | sev_clflush_pages(dst_p, 1); | |
924 | ||
925 | /* | |
926 | * Since user buffer may not be page aligned, calculate the | |
927 | * offset within the page. | |
928 | */ | |
929 | s_off = vaddr & ~PAGE_MASK; | |
930 | d_off = dst_vaddr & ~PAGE_MASK; | |
931 | len = min_t(size_t, (PAGE_SIZE - s_off), size); | |
932 | ||
933 | if (dec) | |
934 | ret = __sev_dbg_decrypt_user(kvm, | |
935 | __sme_page_pa(src_p[0]) + s_off, | |
936 | dst_vaddr, | |
937 | __sme_page_pa(dst_p[0]) + d_off, | |
938 | len, &argp->error); | |
939 | else | |
940 | ret = __sev_dbg_encrypt_user(kvm, | |
941 | __sme_page_pa(src_p[0]) + s_off, | |
942 | vaddr, | |
943 | __sme_page_pa(dst_p[0]) + d_off, | |
944 | dst_vaddr, | |
945 | len, &argp->error); | |
946 | ||
947 | sev_unpin_memory(kvm, src_p, n); | |
948 | sev_unpin_memory(kvm, dst_p, n); | |
949 | ||
950 | if (ret) | |
951 | goto err; | |
952 | ||
953 | next_vaddr = vaddr + len; | |
954 | dst_vaddr = dst_vaddr + len; | |
955 | size -= len; | |
956 | } | |
957 | err: | |
958 | return ret; | |
959 | } | |
960 | ||
961 | static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
962 | { | |
963 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
964 | struct sev_data_launch_secret *data; | |
965 | struct kvm_sev_launch_secret params; | |
966 | struct page **pages; | |
967 | void *blob, *hdr; | |
50085bee | 968 | unsigned long n, i; |
eaf78265 JR |
969 | int ret, offset; |
970 | ||
971 | if (!sev_guest(kvm)) | |
972 | return -ENOTTY; | |
973 | ||
974 | if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) | |
975 | return -EFAULT; | |
976 | ||
977 | pages = sev_pin_memory(kvm, params.guest_uaddr, params.guest_len, &n, 1); | |
a8d908b5 PB |
978 | if (IS_ERR(pages)) |
979 | return PTR_ERR(pages); | |
eaf78265 | 980 | |
50085bee | 981 | /* |
14e3dd8d PB |
982 | * Flush (on non-coherent CPUs) before LAUNCH_SECRET encrypts pages in |
983 | * place; the cache may contain the data that was written unencrypted. | |
50085bee CC |
984 | */ |
985 | sev_clflush_pages(pages, n); | |
986 | ||
eaf78265 JR |
987 | /* |
988 | * The secret must be copied into contiguous memory region, lets verify | |
989 | * that userspace memory pages are contiguous before we issue command. | |
990 | */ | |
991 | if (get_num_contig_pages(0, pages, n) != n) { | |
992 | ret = -EINVAL; | |
993 | goto e_unpin_memory; | |
994 | } | |
995 | ||
996 | ret = -ENOMEM; | |
997 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
998 | if (!data) | |
999 | goto e_unpin_memory; | |
1000 | ||
1001 | offset = params.guest_uaddr & (PAGE_SIZE - 1); | |
1002 | data->guest_address = __sme_page_pa(pages[0]) + offset; | |
1003 | data->guest_len = params.guest_len; | |
1004 | ||
1005 | blob = psp_copy_user_blob(params.trans_uaddr, params.trans_len); | |
1006 | if (IS_ERR(blob)) { | |
1007 | ret = PTR_ERR(blob); | |
1008 | goto e_free; | |
1009 | } | |
1010 | ||
1011 | data->trans_address = __psp_pa(blob); | |
1012 | data->trans_len = params.trans_len; | |
1013 | ||
1014 | hdr = psp_copy_user_blob(params.hdr_uaddr, params.hdr_len); | |
1015 | if (IS_ERR(hdr)) { | |
1016 | ret = PTR_ERR(hdr); | |
1017 | goto e_free_blob; | |
1018 | } | |
1019 | data->hdr_address = __psp_pa(hdr); | |
1020 | data->hdr_len = params.hdr_len; | |
1021 | ||
1022 | data->handle = sev->handle; | |
1023 | ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_SECRET, data, &argp->error); | |
1024 | ||
1025 | kfree(hdr); | |
1026 | ||
1027 | e_free_blob: | |
1028 | kfree(blob); | |
1029 | e_free: | |
1030 | kfree(data); | |
1031 | e_unpin_memory: | |
50085bee CC |
1032 | /* content of memory is updated, mark pages dirty */ |
1033 | for (i = 0; i < n; i++) { | |
1034 | set_page_dirty_lock(pages[i]); | |
1035 | mark_page_accessed(pages[i]); | |
1036 | } | |
eaf78265 JR |
1037 | sev_unpin_memory(kvm, pages, n); |
1038 | return ret; | |
1039 | } | |
1040 | ||
2c07ded0 BS |
1041 | static int sev_get_attestation_report(struct kvm *kvm, struct kvm_sev_cmd *argp) |
1042 | { | |
1043 | void __user *report = (void __user *)(uintptr_t)argp->data; | |
1044 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
1045 | struct sev_data_attestation_report *data; | |
1046 | struct kvm_sev_attestation_report params; | |
1047 | void __user *p; | |
1048 | void *blob = NULL; | |
1049 | int ret; | |
1050 | ||
1051 | if (!sev_guest(kvm)) | |
1052 | return -ENOTTY; | |
1053 | ||
1054 | if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) | |
1055 | return -EFAULT; | |
1056 | ||
1057 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
1058 | if (!data) | |
1059 | return -ENOMEM; | |
1060 | ||
1061 | /* User wants to query the blob length */ | |
1062 | if (!params.len) | |
1063 | goto cmd; | |
1064 | ||
1065 | p = (void __user *)(uintptr_t)params.uaddr; | |
1066 | if (p) { | |
1067 | if (params.len > SEV_FW_BLOB_MAX_SIZE) { | |
1068 | ret = -EINVAL; | |
1069 | goto e_free; | |
1070 | } | |
1071 | ||
1072 | ret = -ENOMEM; | |
1073 | blob = kmalloc(params.len, GFP_KERNEL); | |
1074 | if (!blob) | |
1075 | goto e_free; | |
1076 | ||
1077 | data->address = __psp_pa(blob); | |
1078 | data->len = params.len; | |
1079 | memcpy(data->mnonce, params.mnonce, sizeof(params.mnonce)); | |
1080 | } | |
1081 | cmd: | |
1082 | data->handle = sev->handle; | |
1083 | ret = sev_issue_cmd(kvm, SEV_CMD_ATTESTATION_REPORT, data, &argp->error); | |
1084 | /* | |
1085 | * If we query the session length, FW responded with expected data. | |
1086 | */ | |
1087 | if (!params.len) | |
1088 | goto done; | |
1089 | ||
1090 | if (ret) | |
1091 | goto e_free_blob; | |
1092 | ||
1093 | if (blob) { | |
1094 | if (copy_to_user(p, blob, params.len)) | |
1095 | ret = -EFAULT; | |
1096 | } | |
1097 | ||
1098 | done: | |
1099 | params.len = data->len; | |
1100 | if (copy_to_user(report, ¶ms, sizeof(params))) | |
1101 | ret = -EFAULT; | |
1102 | e_free_blob: | |
1103 | kfree(blob); | |
1104 | e_free: | |
1105 | kfree(data); | |
1106 | return ret; | |
1107 | } | |
1108 | ||
eaf78265 JR |
1109 | int svm_mem_enc_op(struct kvm *kvm, void __user *argp) |
1110 | { | |
1111 | struct kvm_sev_cmd sev_cmd; | |
1112 | int r; | |
1113 | ||
916391a2 | 1114 | if (!svm_sev_enabled() || !sev) |
eaf78265 JR |
1115 | return -ENOTTY; |
1116 | ||
1117 | if (!argp) | |
1118 | return 0; | |
1119 | ||
1120 | if (copy_from_user(&sev_cmd, argp, sizeof(struct kvm_sev_cmd))) | |
1121 | return -EFAULT; | |
1122 | ||
1123 | mutex_lock(&kvm->lock); | |
1124 | ||
1125 | switch (sev_cmd.id) { | |
9fa1521d SC |
1126 | case KVM_SEV_ES_INIT: |
1127 | if (!sev_es) { | |
1128 | r = -ENOTTY; | |
1129 | goto out; | |
1130 | } | |
1131 | fallthrough; | |
eaf78265 JR |
1132 | case KVM_SEV_INIT: |
1133 | r = sev_guest_init(kvm, &sev_cmd); | |
1134 | break; | |
1135 | case KVM_SEV_LAUNCH_START: | |
1136 | r = sev_launch_start(kvm, &sev_cmd); | |
1137 | break; | |
1138 | case KVM_SEV_LAUNCH_UPDATE_DATA: | |
1139 | r = sev_launch_update_data(kvm, &sev_cmd); | |
1140 | break; | |
ad73109a TL |
1141 | case KVM_SEV_LAUNCH_UPDATE_VMSA: |
1142 | r = sev_launch_update_vmsa(kvm, &sev_cmd); | |
1143 | break; | |
eaf78265 JR |
1144 | case KVM_SEV_LAUNCH_MEASURE: |
1145 | r = sev_launch_measure(kvm, &sev_cmd); | |
1146 | break; | |
1147 | case KVM_SEV_LAUNCH_FINISH: | |
1148 | r = sev_launch_finish(kvm, &sev_cmd); | |
1149 | break; | |
1150 | case KVM_SEV_GUEST_STATUS: | |
1151 | r = sev_guest_status(kvm, &sev_cmd); | |
1152 | break; | |
1153 | case KVM_SEV_DBG_DECRYPT: | |
1154 | r = sev_dbg_crypt(kvm, &sev_cmd, true); | |
1155 | break; | |
1156 | case KVM_SEV_DBG_ENCRYPT: | |
1157 | r = sev_dbg_crypt(kvm, &sev_cmd, false); | |
1158 | break; | |
1159 | case KVM_SEV_LAUNCH_SECRET: | |
1160 | r = sev_launch_secret(kvm, &sev_cmd); | |
1161 | break; | |
2c07ded0 BS |
1162 | case KVM_SEV_GET_ATTESTATION_REPORT: |
1163 | r = sev_get_attestation_report(kvm, &sev_cmd); | |
1164 | break; | |
eaf78265 JR |
1165 | default: |
1166 | r = -EINVAL; | |
1167 | goto out; | |
1168 | } | |
1169 | ||
1170 | if (copy_to_user(argp, &sev_cmd, sizeof(struct kvm_sev_cmd))) | |
1171 | r = -EFAULT; | |
1172 | ||
1173 | out: | |
1174 | mutex_unlock(&kvm->lock); | |
1175 | return r; | |
1176 | } | |
1177 | ||
1178 | int svm_register_enc_region(struct kvm *kvm, | |
1179 | struct kvm_enc_region *range) | |
1180 | { | |
1181 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
1182 | struct enc_region *region; | |
1183 | int ret = 0; | |
1184 | ||
1185 | if (!sev_guest(kvm)) | |
1186 | return -ENOTTY; | |
1187 | ||
1188 | if (range->addr > ULONG_MAX || range->size > ULONG_MAX) | |
1189 | return -EINVAL; | |
1190 | ||
1191 | region = kzalloc(sizeof(*region), GFP_KERNEL_ACCOUNT); | |
1192 | if (!region) | |
1193 | return -ENOMEM; | |
1194 | ||
19a23da5 | 1195 | mutex_lock(&kvm->lock); |
eaf78265 | 1196 | region->pages = sev_pin_memory(kvm, range->addr, range->size, ®ion->npages, 1); |
a8d908b5 PB |
1197 | if (IS_ERR(region->pages)) { |
1198 | ret = PTR_ERR(region->pages); | |
19a23da5 | 1199 | mutex_unlock(&kvm->lock); |
eaf78265 JR |
1200 | goto e_free; |
1201 | } | |
1202 | ||
19a23da5 PG |
1203 | region->uaddr = range->addr; |
1204 | region->size = range->size; | |
1205 | ||
1206 | list_add_tail(®ion->list, &sev->regions_list); | |
1207 | mutex_unlock(&kvm->lock); | |
1208 | ||
eaf78265 JR |
1209 | /* |
1210 | * The guest may change the memory encryption attribute from C=0 -> C=1 | |
1211 | * or vice versa for this memory range. Lets make sure caches are | |
1212 | * flushed to ensure that guest data gets written into memory with | |
1213 | * correct C-bit. | |
1214 | */ | |
1215 | sev_clflush_pages(region->pages, region->npages); | |
1216 | ||
eaf78265 JR |
1217 | return ret; |
1218 | ||
1219 | e_free: | |
1220 | kfree(region); | |
1221 | return ret; | |
1222 | } | |
1223 | ||
1224 | static struct enc_region * | |
1225 | find_enc_region(struct kvm *kvm, struct kvm_enc_region *range) | |
1226 | { | |
1227 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
1228 | struct list_head *head = &sev->regions_list; | |
1229 | struct enc_region *i; | |
1230 | ||
1231 | list_for_each_entry(i, head, list) { | |
1232 | if (i->uaddr == range->addr && | |
1233 | i->size == range->size) | |
1234 | return i; | |
1235 | } | |
1236 | ||
1237 | return NULL; | |
1238 | } | |
1239 | ||
1240 | static void __unregister_enc_region_locked(struct kvm *kvm, | |
1241 | struct enc_region *region) | |
1242 | { | |
1243 | sev_unpin_memory(kvm, region->pages, region->npages); | |
1244 | list_del(®ion->list); | |
1245 | kfree(region); | |
1246 | } | |
1247 | ||
1248 | int svm_unregister_enc_region(struct kvm *kvm, | |
1249 | struct kvm_enc_region *range) | |
1250 | { | |
1251 | struct enc_region *region; | |
1252 | int ret; | |
1253 | ||
1254 | mutex_lock(&kvm->lock); | |
1255 | ||
1256 | if (!sev_guest(kvm)) { | |
1257 | ret = -ENOTTY; | |
1258 | goto failed; | |
1259 | } | |
1260 | ||
1261 | region = find_enc_region(kvm, range); | |
1262 | if (!region) { | |
1263 | ret = -EINVAL; | |
1264 | goto failed; | |
1265 | } | |
1266 | ||
1267 | /* | |
1268 | * Ensure that all guest tagged cache entries are flushed before | |
1269 | * releasing the pages back to the system for use. CLFLUSH will | |
1270 | * not do this, so issue a WBINVD. | |
1271 | */ | |
1272 | wbinvd_on_all_cpus(); | |
1273 | ||
1274 | __unregister_enc_region_locked(kvm, region); | |
1275 | ||
1276 | mutex_unlock(&kvm->lock); | |
1277 | return 0; | |
1278 | ||
1279 | failed: | |
1280 | mutex_unlock(&kvm->lock); | |
1281 | return ret; | |
1282 | } | |
1283 | ||
1284 | void sev_vm_destroy(struct kvm *kvm) | |
1285 | { | |
1286 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
1287 | struct list_head *head = &sev->regions_list; | |
1288 | struct list_head *pos, *q; | |
1289 | ||
1290 | if (!sev_guest(kvm)) | |
1291 | return; | |
1292 | ||
1293 | mutex_lock(&kvm->lock); | |
1294 | ||
1295 | /* | |
1296 | * Ensure that all guest tagged cache entries are flushed before | |
1297 | * releasing the pages back to the system for use. CLFLUSH will | |
1298 | * not do this, so issue a WBINVD. | |
1299 | */ | |
1300 | wbinvd_on_all_cpus(); | |
1301 | ||
1302 | /* | |
1303 | * if userspace was terminated before unregistering the memory regions | |
1304 | * then lets unpin all the registered memory. | |
1305 | */ | |
1306 | if (!list_empty(head)) { | |
1307 | list_for_each_safe(pos, q, head) { | |
1308 | __unregister_enc_region_locked(kvm, | |
1309 | list_entry(pos, struct enc_region, list)); | |
7be74942 | 1310 | cond_resched(); |
eaf78265 JR |
1311 | } |
1312 | } | |
1313 | ||
1314 | mutex_unlock(&kvm->lock); | |
1315 | ||
1316 | sev_unbind_asid(kvm, sev->handle); | |
1317 | sev_asid_free(sev->asid); | |
1318 | } | |
1319 | ||
916391a2 | 1320 | void __init sev_hardware_setup(void) |
eaf78265 | 1321 | { |
916391a2 TL |
1322 | unsigned int eax, ebx, ecx, edx; |
1323 | bool sev_es_supported = false; | |
1324 | bool sev_supported = false; | |
1325 | ||
1326 | /* Does the CPU support SEV? */ | |
1327 | if (!boot_cpu_has(X86_FEATURE_SEV)) | |
1328 | goto out; | |
1329 | ||
1330 | /* Retrieve SEV CPUID information */ | |
1331 | cpuid(0x8000001f, &eax, &ebx, &ecx, &edx); | |
1332 | ||
1edc1459 TL |
1333 | /* Set encryption bit location for SEV-ES guests */ |
1334 | sev_enc_bit = ebx & 0x3f; | |
1335 | ||
eaf78265 | 1336 | /* Maximum number of encrypted guests supported simultaneously */ |
916391a2 | 1337 | max_sev_asid = ecx; |
eaf78265 | 1338 | |
9ef1530c | 1339 | if (!svm_sev_enabled()) |
916391a2 | 1340 | goto out; |
eaf78265 JR |
1341 | |
1342 | /* Minimum ASID value that should be used for SEV guest */ | |
916391a2 | 1343 | min_sev_asid = edx; |
eaf78265 JR |
1344 | |
1345 | /* Initialize SEV ASID bitmaps */ | |
1346 | sev_asid_bitmap = bitmap_zalloc(max_sev_asid, GFP_KERNEL); | |
1347 | if (!sev_asid_bitmap) | |
916391a2 | 1348 | goto out; |
eaf78265 JR |
1349 | |
1350 | sev_reclaim_asid_bitmap = bitmap_zalloc(max_sev_asid, GFP_KERNEL); | |
1351 | if (!sev_reclaim_asid_bitmap) | |
916391a2 | 1352 | goto out; |
eaf78265 | 1353 | |
916391a2 TL |
1354 | pr_info("SEV supported: %u ASIDs\n", max_sev_asid - min_sev_asid + 1); |
1355 | sev_supported = true; | |
eaf78265 | 1356 | |
916391a2 TL |
1357 | /* SEV-ES support requested? */ |
1358 | if (!sev_es) | |
1359 | goto out; | |
1360 | ||
1361 | /* Does the CPU support SEV-ES? */ | |
1362 | if (!boot_cpu_has(X86_FEATURE_SEV_ES)) | |
1363 | goto out; | |
1364 | ||
1365 | /* Has the system been allocated ASIDs for SEV-ES? */ | |
1366 | if (min_sev_asid == 1) | |
1367 | goto out; | |
1368 | ||
1369 | pr_info("SEV-ES supported: %u ASIDs\n", min_sev_asid - 1); | |
1370 | sev_es_supported = true; | |
1371 | ||
1372 | out: | |
1373 | sev = sev_supported; | |
1374 | sev_es = sev_es_supported; | |
eaf78265 JR |
1375 | } |
1376 | ||
1377 | void sev_hardware_teardown(void) | |
1378 | { | |
9ef1530c PB |
1379 | if (!svm_sev_enabled()) |
1380 | return; | |
1381 | ||
eaf78265 JR |
1382 | bitmap_free(sev_asid_bitmap); |
1383 | bitmap_free(sev_reclaim_asid_bitmap); | |
1384 | ||
1385 | sev_flush_asids(); | |
1386 | } | |
1387 | ||
add5e2f0 TL |
1388 | /* |
1389 | * Pages used by hardware to hold guest encrypted state must be flushed before | |
1390 | * returning them to the system. | |
1391 | */ | |
1392 | static void sev_flush_guest_memory(struct vcpu_svm *svm, void *va, | |
1393 | unsigned long len) | |
1394 | { | |
1395 | /* | |
1396 | * If hardware enforced cache coherency for encrypted mappings of the | |
1397 | * same physical page is supported, nothing to do. | |
1398 | */ | |
1399 | if (boot_cpu_has(X86_FEATURE_SME_COHERENT)) | |
1400 | return; | |
1401 | ||
1402 | /* | |
1403 | * If the VM Page Flush MSR is supported, use it to flush the page | |
1404 | * (using the page virtual address and the guest ASID). | |
1405 | */ | |
1406 | if (boot_cpu_has(X86_FEATURE_VM_PAGE_FLUSH)) { | |
1407 | struct kvm_sev_info *sev; | |
1408 | unsigned long va_start; | |
1409 | u64 start, stop; | |
1410 | ||
1411 | /* Align start and stop to page boundaries. */ | |
1412 | va_start = (unsigned long)va; | |
1413 | start = (u64)va_start & PAGE_MASK; | |
1414 | stop = PAGE_ALIGN((u64)va_start + len); | |
1415 | ||
1416 | if (start < stop) { | |
1417 | sev = &to_kvm_svm(svm->vcpu.kvm)->sev_info; | |
1418 | ||
1419 | while (start < stop) { | |
1420 | wrmsrl(MSR_AMD64_VM_PAGE_FLUSH, | |
1421 | start | sev->asid); | |
1422 | ||
1423 | start += PAGE_SIZE; | |
1424 | } | |
1425 | ||
1426 | return; | |
1427 | } | |
1428 | ||
1429 | WARN(1, "Address overflow, using WBINVD\n"); | |
1430 | } | |
1431 | ||
1432 | /* | |
1433 | * Hardware should always have one of the above features, | |
1434 | * but if not, use WBINVD and issue a warning. | |
1435 | */ | |
1436 | WARN_ONCE(1, "Using WBINVD to flush guest memory\n"); | |
1437 | wbinvd_on_all_cpus(); | |
1438 | } | |
1439 | ||
1440 | void sev_free_vcpu(struct kvm_vcpu *vcpu) | |
1441 | { | |
1442 | struct vcpu_svm *svm; | |
1443 | ||
1444 | if (!sev_es_guest(vcpu->kvm)) | |
1445 | return; | |
1446 | ||
1447 | svm = to_svm(vcpu); | |
1448 | ||
1449 | if (vcpu->arch.guest_state_protected) | |
1450 | sev_flush_guest_memory(svm, svm->vmsa, PAGE_SIZE); | |
1451 | __free_page(virt_to_page(svm->vmsa)); | |
8f423a80 TL |
1452 | |
1453 | if (svm->ghcb_sa_free) | |
1454 | kfree(svm->ghcb_sa); | |
add5e2f0 TL |
1455 | } |
1456 | ||
291bd20d TL |
1457 | static void dump_ghcb(struct vcpu_svm *svm) |
1458 | { | |
1459 | struct ghcb *ghcb = svm->ghcb; | |
1460 | unsigned int nbits; | |
1461 | ||
1462 | /* Re-use the dump_invalid_vmcb module parameter */ | |
1463 | if (!dump_invalid_vmcb) { | |
1464 | pr_warn_ratelimited("set kvm_amd.dump_invalid_vmcb=1 to dump internal KVM state.\n"); | |
1465 | return; | |
1466 | } | |
1467 | ||
1468 | nbits = sizeof(ghcb->save.valid_bitmap) * 8; | |
1469 | ||
1470 | pr_err("GHCB (GPA=%016llx):\n", svm->vmcb->control.ghcb_gpa); | |
1471 | pr_err("%-20s%016llx is_valid: %u\n", "sw_exit_code", | |
1472 | ghcb->save.sw_exit_code, ghcb_sw_exit_code_is_valid(ghcb)); | |
1473 | pr_err("%-20s%016llx is_valid: %u\n", "sw_exit_info_1", | |
1474 | ghcb->save.sw_exit_info_1, ghcb_sw_exit_info_1_is_valid(ghcb)); | |
1475 | pr_err("%-20s%016llx is_valid: %u\n", "sw_exit_info_2", | |
1476 | ghcb->save.sw_exit_info_2, ghcb_sw_exit_info_2_is_valid(ghcb)); | |
1477 | pr_err("%-20s%016llx is_valid: %u\n", "sw_scratch", | |
1478 | ghcb->save.sw_scratch, ghcb_sw_scratch_is_valid(ghcb)); | |
1479 | pr_err("%-20s%*pb\n", "valid_bitmap", nbits, ghcb->save.valid_bitmap); | |
1480 | } | |
1481 | ||
1482 | static void sev_es_sync_to_ghcb(struct vcpu_svm *svm) | |
1483 | { | |
1484 | struct kvm_vcpu *vcpu = &svm->vcpu; | |
1485 | struct ghcb *ghcb = svm->ghcb; | |
1486 | ||
1487 | /* | |
1488 | * The GHCB protocol so far allows for the following data | |
1489 | * to be returned: | |
1490 | * GPRs RAX, RBX, RCX, RDX | |
1491 | * | |
25009140 SC |
1492 | * Copy their values, even if they may not have been written during the |
1493 | * VM-Exit. It's the guest's responsibility to not consume random data. | |
291bd20d | 1494 | */ |
25009140 SC |
1495 | ghcb_set_rax(ghcb, vcpu->arch.regs[VCPU_REGS_RAX]); |
1496 | ghcb_set_rbx(ghcb, vcpu->arch.regs[VCPU_REGS_RBX]); | |
1497 | ghcb_set_rcx(ghcb, vcpu->arch.regs[VCPU_REGS_RCX]); | |
1498 | ghcb_set_rdx(ghcb, vcpu->arch.regs[VCPU_REGS_RDX]); | |
291bd20d TL |
1499 | } |
1500 | ||
1501 | static void sev_es_sync_from_ghcb(struct vcpu_svm *svm) | |
1502 | { | |
1503 | struct vmcb_control_area *control = &svm->vmcb->control; | |
1504 | struct kvm_vcpu *vcpu = &svm->vcpu; | |
1505 | struct ghcb *ghcb = svm->ghcb; | |
1506 | u64 exit_code; | |
1507 | ||
1508 | /* | |
1509 | * The GHCB protocol so far allows for the following data | |
1510 | * to be supplied: | |
1511 | * GPRs RAX, RBX, RCX, RDX | |
1512 | * XCR0 | |
1513 | * CPL | |
1514 | * | |
1515 | * VMMCALL allows the guest to provide extra registers. KVM also | |
1516 | * expects RSI for hypercalls, so include that, too. | |
1517 | * | |
1518 | * Copy their values to the appropriate location if supplied. | |
1519 | */ | |
1520 | memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs)); | |
1521 | ||
1522 | vcpu->arch.regs[VCPU_REGS_RAX] = ghcb_get_rax_if_valid(ghcb); | |
1523 | vcpu->arch.regs[VCPU_REGS_RBX] = ghcb_get_rbx_if_valid(ghcb); | |
1524 | vcpu->arch.regs[VCPU_REGS_RCX] = ghcb_get_rcx_if_valid(ghcb); | |
1525 | vcpu->arch.regs[VCPU_REGS_RDX] = ghcb_get_rdx_if_valid(ghcb); | |
1526 | vcpu->arch.regs[VCPU_REGS_RSI] = ghcb_get_rsi_if_valid(ghcb); | |
1527 | ||
1528 | svm->vmcb->save.cpl = ghcb_get_cpl_if_valid(ghcb); | |
1529 | ||
1530 | if (ghcb_xcr0_is_valid(ghcb)) { | |
1531 | vcpu->arch.xcr0 = ghcb_get_xcr0(ghcb); | |
1532 | kvm_update_cpuid_runtime(vcpu); | |
1533 | } | |
1534 | ||
1535 | /* Copy the GHCB exit information into the VMCB fields */ | |
1536 | exit_code = ghcb_get_sw_exit_code(ghcb); | |
1537 | control->exit_code = lower_32_bits(exit_code); | |
1538 | control->exit_code_hi = upper_32_bits(exit_code); | |
1539 | control->exit_info_1 = ghcb_get_sw_exit_info_1(ghcb); | |
1540 | control->exit_info_2 = ghcb_get_sw_exit_info_2(ghcb); | |
1541 | ||
1542 | /* Clear the valid entries fields */ | |
1543 | memset(ghcb->save.valid_bitmap, 0, sizeof(ghcb->save.valid_bitmap)); | |
1544 | } | |
1545 | ||
1546 | static int sev_es_validate_vmgexit(struct vcpu_svm *svm) | |
1547 | { | |
1548 | struct kvm_vcpu *vcpu; | |
1549 | struct ghcb *ghcb; | |
1550 | u64 exit_code = 0; | |
1551 | ||
1552 | ghcb = svm->ghcb; | |
1553 | ||
1554 | /* Only GHCB Usage code 0 is supported */ | |
1555 | if (ghcb->ghcb_usage) | |
1556 | goto vmgexit_err; | |
1557 | ||
1558 | /* | |
1559 | * Retrieve the exit code now even though is may not be marked valid | |
1560 | * as it could help with debugging. | |
1561 | */ | |
1562 | exit_code = ghcb_get_sw_exit_code(ghcb); | |
1563 | ||
1564 | if (!ghcb_sw_exit_code_is_valid(ghcb) || | |
1565 | !ghcb_sw_exit_info_1_is_valid(ghcb) || | |
1566 | !ghcb_sw_exit_info_2_is_valid(ghcb)) | |
1567 | goto vmgexit_err; | |
1568 | ||
1569 | switch (ghcb_get_sw_exit_code(ghcb)) { | |
1570 | case SVM_EXIT_READ_DR7: | |
1571 | break; | |
1572 | case SVM_EXIT_WRITE_DR7: | |
1573 | if (!ghcb_rax_is_valid(ghcb)) | |
1574 | goto vmgexit_err; | |
1575 | break; | |
1576 | case SVM_EXIT_RDTSC: | |
1577 | break; | |
1578 | case SVM_EXIT_RDPMC: | |
1579 | if (!ghcb_rcx_is_valid(ghcb)) | |
1580 | goto vmgexit_err; | |
1581 | break; | |
1582 | case SVM_EXIT_CPUID: | |
1583 | if (!ghcb_rax_is_valid(ghcb) || | |
1584 | !ghcb_rcx_is_valid(ghcb)) | |
1585 | goto vmgexit_err; | |
1586 | if (ghcb_get_rax(ghcb) == 0xd) | |
1587 | if (!ghcb_xcr0_is_valid(ghcb)) | |
1588 | goto vmgexit_err; | |
1589 | break; | |
1590 | case SVM_EXIT_INVD: | |
1591 | break; | |
1592 | case SVM_EXIT_IOIO: | |
7ed9abfe TL |
1593 | if (ghcb_get_sw_exit_info_1(ghcb) & SVM_IOIO_STR_MASK) { |
1594 | if (!ghcb_sw_scratch_is_valid(ghcb)) | |
291bd20d | 1595 | goto vmgexit_err; |
7ed9abfe TL |
1596 | } else { |
1597 | if (!(ghcb_get_sw_exit_info_1(ghcb) & SVM_IOIO_TYPE_MASK)) | |
1598 | if (!ghcb_rax_is_valid(ghcb)) | |
1599 | goto vmgexit_err; | |
1600 | } | |
291bd20d TL |
1601 | break; |
1602 | case SVM_EXIT_MSR: | |
1603 | if (!ghcb_rcx_is_valid(ghcb)) | |
1604 | goto vmgexit_err; | |
1605 | if (ghcb_get_sw_exit_info_1(ghcb)) { | |
1606 | if (!ghcb_rax_is_valid(ghcb) || | |
1607 | !ghcb_rdx_is_valid(ghcb)) | |
1608 | goto vmgexit_err; | |
1609 | } | |
1610 | break; | |
1611 | case SVM_EXIT_VMMCALL: | |
1612 | if (!ghcb_rax_is_valid(ghcb) || | |
1613 | !ghcb_cpl_is_valid(ghcb)) | |
1614 | goto vmgexit_err; | |
1615 | break; | |
1616 | case SVM_EXIT_RDTSCP: | |
1617 | break; | |
1618 | case SVM_EXIT_WBINVD: | |
1619 | break; | |
1620 | case SVM_EXIT_MONITOR: | |
1621 | if (!ghcb_rax_is_valid(ghcb) || | |
1622 | !ghcb_rcx_is_valid(ghcb) || | |
1623 | !ghcb_rdx_is_valid(ghcb)) | |
1624 | goto vmgexit_err; | |
1625 | break; | |
1626 | case SVM_EXIT_MWAIT: | |
1627 | if (!ghcb_rax_is_valid(ghcb) || | |
1628 | !ghcb_rcx_is_valid(ghcb)) | |
1629 | goto vmgexit_err; | |
1630 | break; | |
8f423a80 TL |
1631 | case SVM_VMGEXIT_MMIO_READ: |
1632 | case SVM_VMGEXIT_MMIO_WRITE: | |
1633 | if (!ghcb_sw_scratch_is_valid(ghcb)) | |
1634 | goto vmgexit_err; | |
1635 | break; | |
4444dfe4 | 1636 | case SVM_VMGEXIT_NMI_COMPLETE: |
647daca2 | 1637 | case SVM_VMGEXIT_AP_HLT_LOOP: |
8640ca58 | 1638 | case SVM_VMGEXIT_AP_JUMP_TABLE: |
291bd20d TL |
1639 | case SVM_VMGEXIT_UNSUPPORTED_EVENT: |
1640 | break; | |
1641 | default: | |
1642 | goto vmgexit_err; | |
1643 | } | |
1644 | ||
1645 | return 0; | |
1646 | ||
1647 | vmgexit_err: | |
1648 | vcpu = &svm->vcpu; | |
1649 | ||
1650 | if (ghcb->ghcb_usage) { | |
1651 | vcpu_unimpl(vcpu, "vmgexit: ghcb usage %#x is not valid\n", | |
1652 | ghcb->ghcb_usage); | |
1653 | } else { | |
1654 | vcpu_unimpl(vcpu, "vmgexit: exit reason %#llx is not valid\n", | |
1655 | exit_code); | |
1656 | dump_ghcb(svm); | |
1657 | } | |
1658 | ||
1659 | vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
1660 | vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_UNEXPECTED_EXIT_REASON; | |
1661 | vcpu->run->internal.ndata = 2; | |
1662 | vcpu->run->internal.data[0] = exit_code; | |
1663 | vcpu->run->internal.data[1] = vcpu->arch.last_vmentry_cpu; | |
1664 | ||
1665 | return -EINVAL; | |
1666 | } | |
1667 | ||
1668 | static void pre_sev_es_run(struct vcpu_svm *svm) | |
1669 | { | |
1670 | if (!svm->ghcb) | |
1671 | return; | |
1672 | ||
8f423a80 TL |
1673 | if (svm->ghcb_sa_free) { |
1674 | /* | |
1675 | * The scratch area lives outside the GHCB, so there is a | |
1676 | * buffer that, depending on the operation performed, may | |
1677 | * need to be synced, then freed. | |
1678 | */ | |
1679 | if (svm->ghcb_sa_sync) { | |
1680 | kvm_write_guest(svm->vcpu.kvm, | |
1681 | ghcb_get_sw_scratch(svm->ghcb), | |
1682 | svm->ghcb_sa, svm->ghcb_sa_len); | |
1683 | svm->ghcb_sa_sync = false; | |
1684 | } | |
1685 | ||
1686 | kfree(svm->ghcb_sa); | |
1687 | svm->ghcb_sa = NULL; | |
1688 | svm->ghcb_sa_free = false; | |
1689 | } | |
1690 | ||
d523ab6b TL |
1691 | trace_kvm_vmgexit_exit(svm->vcpu.vcpu_id, svm->ghcb); |
1692 | ||
291bd20d TL |
1693 | sev_es_sync_to_ghcb(svm); |
1694 | ||
1695 | kvm_vcpu_unmap(&svm->vcpu, &svm->ghcb_map, true); | |
1696 | svm->ghcb = NULL; | |
1697 | } | |
1698 | ||
eaf78265 JR |
1699 | void pre_sev_run(struct vcpu_svm *svm, int cpu) |
1700 | { | |
1701 | struct svm_cpu_data *sd = per_cpu(svm_data, cpu); | |
1702 | int asid = sev_get_asid(svm->vcpu.kvm); | |
1703 | ||
291bd20d TL |
1704 | /* Perform any SEV-ES pre-run actions */ |
1705 | pre_sev_es_run(svm); | |
1706 | ||
eaf78265 | 1707 | /* Assign the asid allocated with this SEV guest */ |
dee734a7 | 1708 | svm->asid = asid; |
eaf78265 JR |
1709 | |
1710 | /* | |
1711 | * Flush guest TLB: | |
1712 | * | |
1713 | * 1) when different VMCB for the same ASID is to be run on the same host CPU. | |
1714 | * 2) or this VMCB was executed on different host CPU in previous VMRUNs. | |
1715 | */ | |
1716 | if (sd->sev_vmcbs[asid] == svm->vmcb && | |
8a14fe4f | 1717 | svm->vcpu.arch.last_vmentry_cpu == cpu) |
eaf78265 JR |
1718 | return; |
1719 | ||
eaf78265 JR |
1720 | sd->sev_vmcbs[asid] = svm->vmcb; |
1721 | svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID; | |
06e7852c | 1722 | vmcb_mark_dirty(svm->vmcb, VMCB_ASID); |
eaf78265 | 1723 | } |
291bd20d | 1724 | |
8f423a80 TL |
1725 | #define GHCB_SCRATCH_AREA_LIMIT (16ULL * PAGE_SIZE) |
1726 | static bool setup_vmgexit_scratch(struct vcpu_svm *svm, bool sync, u64 len) | |
1727 | { | |
1728 | struct vmcb_control_area *control = &svm->vmcb->control; | |
1729 | struct ghcb *ghcb = svm->ghcb; | |
1730 | u64 ghcb_scratch_beg, ghcb_scratch_end; | |
1731 | u64 scratch_gpa_beg, scratch_gpa_end; | |
1732 | void *scratch_va; | |
1733 | ||
1734 | scratch_gpa_beg = ghcb_get_sw_scratch(ghcb); | |
1735 | if (!scratch_gpa_beg) { | |
1736 | pr_err("vmgexit: scratch gpa not provided\n"); | |
1737 | return false; | |
1738 | } | |
1739 | ||
1740 | scratch_gpa_end = scratch_gpa_beg + len; | |
1741 | if (scratch_gpa_end < scratch_gpa_beg) { | |
1742 | pr_err("vmgexit: scratch length (%#llx) not valid for scratch address (%#llx)\n", | |
1743 | len, scratch_gpa_beg); | |
1744 | return false; | |
1745 | } | |
1746 | ||
1747 | if ((scratch_gpa_beg & PAGE_MASK) == control->ghcb_gpa) { | |
1748 | /* Scratch area begins within GHCB */ | |
1749 | ghcb_scratch_beg = control->ghcb_gpa + | |
1750 | offsetof(struct ghcb, shared_buffer); | |
1751 | ghcb_scratch_end = control->ghcb_gpa + | |
1752 | offsetof(struct ghcb, reserved_1); | |
1753 | ||
1754 | /* | |
1755 | * If the scratch area begins within the GHCB, it must be | |
1756 | * completely contained in the GHCB shared buffer area. | |
1757 | */ | |
1758 | if (scratch_gpa_beg < ghcb_scratch_beg || | |
1759 | scratch_gpa_end > ghcb_scratch_end) { | |
1760 | pr_err("vmgexit: scratch area is outside of GHCB shared buffer area (%#llx - %#llx)\n", | |
1761 | scratch_gpa_beg, scratch_gpa_end); | |
1762 | return false; | |
1763 | } | |
1764 | ||
1765 | scratch_va = (void *)svm->ghcb; | |
1766 | scratch_va += (scratch_gpa_beg - control->ghcb_gpa); | |
1767 | } else { | |
1768 | /* | |
1769 | * The guest memory must be read into a kernel buffer, so | |
1770 | * limit the size | |
1771 | */ | |
1772 | if (len > GHCB_SCRATCH_AREA_LIMIT) { | |
1773 | pr_err("vmgexit: scratch area exceeds KVM limits (%#llx requested, %#llx limit)\n", | |
1774 | len, GHCB_SCRATCH_AREA_LIMIT); | |
1775 | return false; | |
1776 | } | |
1777 | scratch_va = kzalloc(len, GFP_KERNEL); | |
1778 | if (!scratch_va) | |
1779 | return false; | |
1780 | ||
1781 | if (kvm_read_guest(svm->vcpu.kvm, scratch_gpa_beg, scratch_va, len)) { | |
1782 | /* Unable to copy scratch area from guest */ | |
1783 | pr_err("vmgexit: kvm_read_guest for scratch area failed\n"); | |
1784 | ||
1785 | kfree(scratch_va); | |
1786 | return false; | |
1787 | } | |
1788 | ||
1789 | /* | |
1790 | * The scratch area is outside the GHCB. The operation will | |
1791 | * dictate whether the buffer needs to be synced before running | |
1792 | * the vCPU next time (i.e. a read was requested so the data | |
1793 | * must be written back to the guest memory). | |
1794 | */ | |
1795 | svm->ghcb_sa_sync = sync; | |
1796 | svm->ghcb_sa_free = true; | |
1797 | } | |
1798 | ||
1799 | svm->ghcb_sa = scratch_va; | |
1800 | svm->ghcb_sa_len = len; | |
1801 | ||
1802 | return true; | |
1803 | } | |
1804 | ||
d3694667 TL |
1805 | static void set_ghcb_msr_bits(struct vcpu_svm *svm, u64 value, u64 mask, |
1806 | unsigned int pos) | |
1807 | { | |
1808 | svm->vmcb->control.ghcb_gpa &= ~(mask << pos); | |
1809 | svm->vmcb->control.ghcb_gpa |= (value & mask) << pos; | |
1810 | } | |
1811 | ||
1812 | static u64 get_ghcb_msr_bits(struct vcpu_svm *svm, u64 mask, unsigned int pos) | |
1813 | { | |
1814 | return (svm->vmcb->control.ghcb_gpa >> pos) & mask; | |
1815 | } | |
1816 | ||
1edc1459 TL |
1817 | static void set_ghcb_msr(struct vcpu_svm *svm, u64 value) |
1818 | { | |
1819 | svm->vmcb->control.ghcb_gpa = value; | |
1820 | } | |
1821 | ||
291bd20d TL |
1822 | static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm) |
1823 | { | |
1edc1459 | 1824 | struct vmcb_control_area *control = &svm->vmcb->control; |
d3694667 | 1825 | struct kvm_vcpu *vcpu = &svm->vcpu; |
1edc1459 | 1826 | u64 ghcb_info; |
d3694667 | 1827 | int ret = 1; |
1edc1459 TL |
1828 | |
1829 | ghcb_info = control->ghcb_gpa & GHCB_MSR_INFO_MASK; | |
1830 | ||
59e38b58 TL |
1831 | trace_kvm_vmgexit_msr_protocol_enter(svm->vcpu.vcpu_id, |
1832 | control->ghcb_gpa); | |
1833 | ||
1edc1459 TL |
1834 | switch (ghcb_info) { |
1835 | case GHCB_MSR_SEV_INFO_REQ: | |
1836 | set_ghcb_msr(svm, GHCB_MSR_SEV_INFO(GHCB_VERSION_MAX, | |
1837 | GHCB_VERSION_MIN, | |
1838 | sev_enc_bit)); | |
1839 | break; | |
d3694667 TL |
1840 | case GHCB_MSR_CPUID_REQ: { |
1841 | u64 cpuid_fn, cpuid_reg, cpuid_value; | |
1842 | ||
1843 | cpuid_fn = get_ghcb_msr_bits(svm, | |
1844 | GHCB_MSR_CPUID_FUNC_MASK, | |
1845 | GHCB_MSR_CPUID_FUNC_POS); | |
1846 | ||
1847 | /* Initialize the registers needed by the CPUID intercept */ | |
1848 | vcpu->arch.regs[VCPU_REGS_RAX] = cpuid_fn; | |
1849 | vcpu->arch.regs[VCPU_REGS_RCX] = 0; | |
1850 | ||
63129754 | 1851 | ret = svm_invoke_exit_handler(vcpu, SVM_EXIT_CPUID); |
d3694667 TL |
1852 | if (!ret) { |
1853 | ret = -EINVAL; | |
1854 | break; | |
1855 | } | |
1856 | ||
1857 | cpuid_reg = get_ghcb_msr_bits(svm, | |
1858 | GHCB_MSR_CPUID_REG_MASK, | |
1859 | GHCB_MSR_CPUID_REG_POS); | |
1860 | if (cpuid_reg == 0) | |
1861 | cpuid_value = vcpu->arch.regs[VCPU_REGS_RAX]; | |
1862 | else if (cpuid_reg == 1) | |
1863 | cpuid_value = vcpu->arch.regs[VCPU_REGS_RBX]; | |
1864 | else if (cpuid_reg == 2) | |
1865 | cpuid_value = vcpu->arch.regs[VCPU_REGS_RCX]; | |
1866 | else | |
1867 | cpuid_value = vcpu->arch.regs[VCPU_REGS_RDX]; | |
1868 | ||
1869 | set_ghcb_msr_bits(svm, cpuid_value, | |
1870 | GHCB_MSR_CPUID_VALUE_MASK, | |
1871 | GHCB_MSR_CPUID_VALUE_POS); | |
1872 | ||
1873 | set_ghcb_msr_bits(svm, GHCB_MSR_CPUID_RESP, | |
1874 | GHCB_MSR_INFO_MASK, | |
1875 | GHCB_MSR_INFO_POS); | |
1876 | break; | |
1877 | } | |
e1d71116 TL |
1878 | case GHCB_MSR_TERM_REQ: { |
1879 | u64 reason_set, reason_code; | |
1880 | ||
1881 | reason_set = get_ghcb_msr_bits(svm, | |
1882 | GHCB_MSR_TERM_REASON_SET_MASK, | |
1883 | GHCB_MSR_TERM_REASON_SET_POS); | |
1884 | reason_code = get_ghcb_msr_bits(svm, | |
1885 | GHCB_MSR_TERM_REASON_MASK, | |
1886 | GHCB_MSR_TERM_REASON_POS); | |
1887 | pr_info("SEV-ES guest requested termination: %#llx:%#llx\n", | |
1888 | reason_set, reason_code); | |
1889 | fallthrough; | |
1890 | } | |
1edc1459 | 1891 | default: |
d3694667 | 1892 | ret = -EINVAL; |
1edc1459 TL |
1893 | } |
1894 | ||
59e38b58 TL |
1895 | trace_kvm_vmgexit_msr_protocol_exit(svm->vcpu.vcpu_id, |
1896 | control->ghcb_gpa, ret); | |
1897 | ||
d3694667 | 1898 | return ret; |
291bd20d TL |
1899 | } |
1900 | ||
63129754 | 1901 | int sev_handle_vmgexit(struct kvm_vcpu *vcpu) |
291bd20d | 1902 | { |
63129754 | 1903 | struct vcpu_svm *svm = to_svm(vcpu); |
291bd20d TL |
1904 | struct vmcb_control_area *control = &svm->vmcb->control; |
1905 | u64 ghcb_gpa, exit_code; | |
1906 | struct ghcb *ghcb; | |
1907 | int ret; | |
1908 | ||
1909 | /* Validate the GHCB */ | |
1910 | ghcb_gpa = control->ghcb_gpa; | |
1911 | if (ghcb_gpa & GHCB_MSR_INFO_MASK) | |
1912 | return sev_handle_vmgexit_msr_protocol(svm); | |
1913 | ||
1914 | if (!ghcb_gpa) { | |
63129754 | 1915 | vcpu_unimpl(vcpu, "vmgexit: GHCB gpa is not set\n"); |
291bd20d TL |
1916 | return -EINVAL; |
1917 | } | |
1918 | ||
63129754 | 1919 | if (kvm_vcpu_map(vcpu, ghcb_gpa >> PAGE_SHIFT, &svm->ghcb_map)) { |
291bd20d | 1920 | /* Unable to map GHCB from guest */ |
63129754 | 1921 | vcpu_unimpl(vcpu, "vmgexit: error mapping GHCB [%#llx] from guest\n", |
291bd20d TL |
1922 | ghcb_gpa); |
1923 | return -EINVAL; | |
1924 | } | |
1925 | ||
1926 | svm->ghcb = svm->ghcb_map.hva; | |
1927 | ghcb = svm->ghcb_map.hva; | |
1928 | ||
63129754 | 1929 | trace_kvm_vmgexit_enter(vcpu->vcpu_id, ghcb); |
d523ab6b | 1930 | |
291bd20d TL |
1931 | exit_code = ghcb_get_sw_exit_code(ghcb); |
1932 | ||
1933 | ret = sev_es_validate_vmgexit(svm); | |
1934 | if (ret) | |
1935 | return ret; | |
1936 | ||
1937 | sev_es_sync_from_ghcb(svm); | |
1938 | ghcb_set_sw_exit_info_1(ghcb, 0); | |
1939 | ghcb_set_sw_exit_info_2(ghcb, 0); | |
1940 | ||
1941 | ret = -EINVAL; | |
1942 | switch (exit_code) { | |
8f423a80 TL |
1943 | case SVM_VMGEXIT_MMIO_READ: |
1944 | if (!setup_vmgexit_scratch(svm, true, control->exit_info_2)) | |
1945 | break; | |
1946 | ||
63129754 | 1947 | ret = kvm_sev_es_mmio_read(vcpu, |
8f423a80 TL |
1948 | control->exit_info_1, |
1949 | control->exit_info_2, | |
1950 | svm->ghcb_sa); | |
1951 | break; | |
1952 | case SVM_VMGEXIT_MMIO_WRITE: | |
1953 | if (!setup_vmgexit_scratch(svm, false, control->exit_info_2)) | |
1954 | break; | |
1955 | ||
63129754 | 1956 | ret = kvm_sev_es_mmio_write(vcpu, |
8f423a80 TL |
1957 | control->exit_info_1, |
1958 | control->exit_info_2, | |
1959 | svm->ghcb_sa); | |
1960 | break; | |
4444dfe4 | 1961 | case SVM_VMGEXIT_NMI_COMPLETE: |
63129754 | 1962 | ret = svm_invoke_exit_handler(vcpu, SVM_EXIT_IRET); |
4444dfe4 | 1963 | break; |
647daca2 | 1964 | case SVM_VMGEXIT_AP_HLT_LOOP: |
63129754 | 1965 | ret = kvm_emulate_ap_reset_hold(vcpu); |
647daca2 | 1966 | break; |
8640ca58 | 1967 | case SVM_VMGEXIT_AP_JUMP_TABLE: { |
63129754 | 1968 | struct kvm_sev_info *sev = &to_kvm_svm(vcpu->kvm)->sev_info; |
8640ca58 TL |
1969 | |
1970 | switch (control->exit_info_1) { | |
1971 | case 0: | |
1972 | /* Set AP jump table address */ | |
1973 | sev->ap_jump_table = control->exit_info_2; | |
1974 | break; | |
1975 | case 1: | |
1976 | /* Get AP jump table address */ | |
1977 | ghcb_set_sw_exit_info_2(ghcb, sev->ap_jump_table); | |
1978 | break; | |
1979 | default: | |
1980 | pr_err("svm: vmgexit: unsupported AP jump table request - exit_info_1=%#llx\n", | |
1981 | control->exit_info_1); | |
1982 | ghcb_set_sw_exit_info_1(ghcb, 1); | |
1983 | ghcb_set_sw_exit_info_2(ghcb, | |
1984 | X86_TRAP_UD | | |
1985 | SVM_EVTINJ_TYPE_EXEPT | | |
1986 | SVM_EVTINJ_VALID); | |
1987 | } | |
1988 | ||
1989 | ret = 1; | |
1990 | break; | |
1991 | } | |
291bd20d | 1992 | case SVM_VMGEXIT_UNSUPPORTED_EVENT: |
63129754 | 1993 | vcpu_unimpl(vcpu, |
291bd20d TL |
1994 | "vmgexit: unsupported event - exit_info_1=%#llx, exit_info_2=%#llx\n", |
1995 | control->exit_info_1, control->exit_info_2); | |
1996 | break; | |
1997 | default: | |
63129754 | 1998 | ret = svm_invoke_exit_handler(vcpu, exit_code); |
291bd20d TL |
1999 | } |
2000 | ||
2001 | return ret; | |
2002 | } | |
7ed9abfe TL |
2003 | |
2004 | int sev_es_string_io(struct vcpu_svm *svm, int size, unsigned int port, int in) | |
2005 | { | |
2006 | if (!setup_vmgexit_scratch(svm, in, svm->vmcb->control.exit_info_2)) | |
2007 | return -EINVAL; | |
2008 | ||
2009 | return kvm_sev_es_string_io(&svm->vcpu, size, port, | |
2010 | svm->ghcb_sa, svm->ghcb_sa_len, in); | |
2011 | } | |
376c6d28 TL |
2012 | |
2013 | void sev_es_init_vmcb(struct vcpu_svm *svm) | |
2014 | { | |
2015 | struct kvm_vcpu *vcpu = &svm->vcpu; | |
2016 | ||
2017 | svm->vmcb->control.nested_ctl |= SVM_NESTED_CTL_SEV_ES_ENABLE; | |
2018 | svm->vmcb->control.virt_ext |= LBR_CTL_ENABLE_MASK; | |
2019 | ||
2020 | /* | |
2021 | * An SEV-ES guest requires a VMSA area that is a separate from the | |
2022 | * VMCB page. Do not include the encryption mask on the VMSA physical | |
2023 | * address since hardware will access it using the guest key. | |
2024 | */ | |
2025 | svm->vmcb->control.vmsa_pa = __pa(svm->vmsa); | |
2026 | ||
2027 | /* Can't intercept CR register access, HV can't modify CR registers */ | |
2028 | svm_clr_intercept(svm, INTERCEPT_CR0_READ); | |
2029 | svm_clr_intercept(svm, INTERCEPT_CR4_READ); | |
2030 | svm_clr_intercept(svm, INTERCEPT_CR8_READ); | |
2031 | svm_clr_intercept(svm, INTERCEPT_CR0_WRITE); | |
2032 | svm_clr_intercept(svm, INTERCEPT_CR4_WRITE); | |
2033 | svm_clr_intercept(svm, INTERCEPT_CR8_WRITE); | |
2034 | ||
2035 | svm_clr_intercept(svm, INTERCEPT_SELECTIVE_CR0); | |
2036 | ||
2037 | /* Track EFER/CR register changes */ | |
2038 | svm_set_intercept(svm, TRAP_EFER_WRITE); | |
2039 | svm_set_intercept(svm, TRAP_CR0_WRITE); | |
2040 | svm_set_intercept(svm, TRAP_CR4_WRITE); | |
2041 | svm_set_intercept(svm, TRAP_CR8_WRITE); | |
2042 | ||
2043 | /* No support for enable_vmware_backdoor */ | |
2044 | clr_exception_intercept(svm, GP_VECTOR); | |
2045 | ||
2046 | /* Can't intercept XSETBV, HV can't modify XCR0 directly */ | |
2047 | svm_clr_intercept(svm, INTERCEPT_XSETBV); | |
2048 | ||
2049 | /* Clear intercepts on selected MSRs */ | |
2050 | set_msr_interception(vcpu, svm->msrpm, MSR_EFER, 1, 1); | |
2051 | set_msr_interception(vcpu, svm->msrpm, MSR_IA32_CR_PAT, 1, 1); | |
2052 | set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1); | |
2053 | set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1); | |
2054 | set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 1, 1); | |
2055 | set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 1, 1); | |
2056 | } | |
2057 | ||
2058 | void sev_es_create_vcpu(struct vcpu_svm *svm) | |
2059 | { | |
2060 | /* | |
2061 | * Set the GHCB MSR value as per the GHCB specification when creating | |
2062 | * a vCPU for an SEV-ES guest. | |
2063 | */ | |
2064 | set_ghcb_msr(svm, GHCB_MSR_SEV_INFO(GHCB_VERSION_MAX, | |
2065 | GHCB_VERSION_MIN, | |
2066 | sev_enc_bit)); | |
2067 | } | |
86137773 | 2068 | |
a7fc06dd | 2069 | void sev_es_prepare_guest_switch(struct vcpu_svm *svm, unsigned int cpu) |
86137773 TL |
2070 | { |
2071 | struct svm_cpu_data *sd = per_cpu(svm_data, cpu); | |
2072 | struct vmcb_save_area *hostsa; | |
86137773 TL |
2073 | |
2074 | /* | |
2075 | * As an SEV-ES guest, hardware will restore the host state on VMEXIT, | |
2076 | * of which one step is to perform a VMLOAD. Since hardware does not | |
2077 | * perform a VMSAVE on VMRUN, the host savearea must be updated. | |
2078 | */ | |
35a78319 | 2079 | vmsave(__sme_page_pa(sd->save_area)); |
86137773 | 2080 | |
86137773 TL |
2081 | /* XCR0 is restored on VMEXIT, save the current host value */ |
2082 | hostsa = (struct vmcb_save_area *)(page_address(sd->save_area) + 0x400); | |
2083 | hostsa->xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); | |
2084 | ||
2085 | /* PKRU is restored on VMEXIT, save the curent host value */ | |
2086 | hostsa->pkru = read_pkru(); | |
2087 | ||
2088 | /* MSR_IA32_XSS is restored on VMEXIT, save the currnet host value */ | |
2089 | hostsa->xss = host_xss; | |
2090 | } | |
2091 | ||
647daca2 TL |
2092 | void sev_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector) |
2093 | { | |
2094 | struct vcpu_svm *svm = to_svm(vcpu); | |
2095 | ||
2096 | /* First SIPI: Use the values as initially set by the VMM */ | |
2097 | if (!svm->received_first_sipi) { | |
2098 | svm->received_first_sipi = true; | |
2099 | return; | |
2100 | } | |
2101 | ||
2102 | /* | |
2103 | * Subsequent SIPI: Return from an AP Reset Hold VMGEXIT, where | |
2104 | * the guest will set the CS and RIP. Set SW_EXIT_INFO_2 to a | |
2105 | * non-zero value. | |
2106 | */ | |
2107 | ghcb_set_sw_exit_info_2(svm->ghcb, 1); | |
2108 | } |