]>
Commit | Line | Data |
---|---|---|
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> |
eaf78265 JR |
19 | |
20 | #include "x86.h" | |
21 | #include "svm.h" | |
291bd20d | 22 | #include "cpuid.h" |
d523ab6b | 23 | #include "trace.h" |
eaf78265 | 24 | |
1edc1459 | 25 | static u8 sev_enc_bit; |
eaf78265 JR |
26 | static int sev_flush_asids(void); |
27 | static DECLARE_RWSEM(sev_deactivate_lock); | |
28 | static DEFINE_MUTEX(sev_bitmap_lock); | |
29 | unsigned int max_sev_asid; | |
30 | static unsigned int min_sev_asid; | |
31 | static unsigned long *sev_asid_bitmap; | |
32 | static unsigned long *sev_reclaim_asid_bitmap; | |
33 | #define __sme_page_pa(x) __sme_set(page_to_pfn(x) << PAGE_SHIFT) | |
34 | ||
35 | struct enc_region { | |
36 | struct list_head list; | |
37 | unsigned long npages; | |
38 | struct page **pages; | |
39 | unsigned long uaddr; | |
40 | unsigned long size; | |
41 | }; | |
42 | ||
43 | static int sev_flush_asids(void) | |
44 | { | |
45 | int ret, error = 0; | |
46 | ||
47 | /* | |
48 | * DEACTIVATE will clear the WBINVD indicator causing DF_FLUSH to fail, | |
49 | * so it must be guarded. | |
50 | */ | |
51 | down_write(&sev_deactivate_lock); | |
52 | ||
53 | wbinvd_on_all_cpus(); | |
54 | ret = sev_guest_df_flush(&error); | |
55 | ||
56 | up_write(&sev_deactivate_lock); | |
57 | ||
58 | if (ret) | |
59 | pr_err("SEV: DF_FLUSH failed, ret=%d, error=%#x\n", ret, error); | |
60 | ||
61 | return ret; | |
62 | } | |
63 | ||
64 | /* Must be called with the sev_bitmap_lock held */ | |
65 | static bool __sev_recycle_asids(void) | |
66 | { | |
67 | int pos; | |
68 | ||
69 | /* Check if there are any ASIDs to reclaim before performing a flush */ | |
70 | pos = find_next_bit(sev_reclaim_asid_bitmap, | |
71 | max_sev_asid, min_sev_asid - 1); | |
72 | if (pos >= max_sev_asid) | |
73 | return false; | |
74 | ||
75 | if (sev_flush_asids()) | |
76 | return false; | |
77 | ||
78 | bitmap_xor(sev_asid_bitmap, sev_asid_bitmap, sev_reclaim_asid_bitmap, | |
79 | max_sev_asid); | |
80 | bitmap_zero(sev_reclaim_asid_bitmap, max_sev_asid); | |
81 | ||
82 | return true; | |
83 | } | |
84 | ||
85 | static int sev_asid_new(void) | |
86 | { | |
87 | bool retry = true; | |
88 | int pos; | |
89 | ||
90 | mutex_lock(&sev_bitmap_lock); | |
91 | ||
92 | /* | |
93 | * SEV-enabled guest must use asid from min_sev_asid to max_sev_asid. | |
94 | */ | |
95 | again: | |
96 | pos = find_next_zero_bit(sev_asid_bitmap, max_sev_asid, min_sev_asid - 1); | |
97 | if (pos >= max_sev_asid) { | |
98 | if (retry && __sev_recycle_asids()) { | |
99 | retry = false; | |
100 | goto again; | |
101 | } | |
102 | mutex_unlock(&sev_bitmap_lock); | |
103 | return -EBUSY; | |
104 | } | |
105 | ||
106 | __set_bit(pos, sev_asid_bitmap); | |
107 | ||
108 | mutex_unlock(&sev_bitmap_lock); | |
109 | ||
110 | return pos + 1; | |
111 | } | |
112 | ||
113 | static int sev_get_asid(struct kvm *kvm) | |
114 | { | |
115 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
116 | ||
117 | return sev->asid; | |
118 | } | |
119 | ||
120 | static void sev_asid_free(int asid) | |
121 | { | |
122 | struct svm_cpu_data *sd; | |
123 | int cpu, pos; | |
124 | ||
125 | mutex_lock(&sev_bitmap_lock); | |
126 | ||
127 | pos = asid - 1; | |
128 | __set_bit(pos, sev_reclaim_asid_bitmap); | |
129 | ||
130 | for_each_possible_cpu(cpu) { | |
131 | sd = per_cpu(svm_data, cpu); | |
132 | sd->sev_vmcbs[pos] = NULL; | |
133 | } | |
134 | ||
135 | mutex_unlock(&sev_bitmap_lock); | |
136 | } | |
137 | ||
138 | static void sev_unbind_asid(struct kvm *kvm, unsigned int handle) | |
139 | { | |
140 | struct sev_data_decommission *decommission; | |
141 | struct sev_data_deactivate *data; | |
142 | ||
143 | if (!handle) | |
144 | return; | |
145 | ||
146 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
147 | if (!data) | |
148 | return; | |
149 | ||
150 | /* deactivate handle */ | |
151 | data->handle = handle; | |
152 | ||
153 | /* Guard DEACTIVATE against WBINVD/DF_FLUSH used in ASID recycling */ | |
154 | down_read(&sev_deactivate_lock); | |
155 | sev_guest_deactivate(data, NULL); | |
156 | up_read(&sev_deactivate_lock); | |
157 | ||
158 | kfree(data); | |
159 | ||
160 | decommission = kzalloc(sizeof(*decommission), GFP_KERNEL); | |
161 | if (!decommission) | |
162 | return; | |
163 | ||
164 | /* decommission handle */ | |
165 | decommission->handle = handle; | |
166 | sev_guest_decommission(decommission, NULL); | |
167 | ||
168 | kfree(decommission); | |
169 | } | |
170 | ||
171 | static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
172 | { | |
173 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
174 | int asid, ret; | |
175 | ||
176 | ret = -EBUSY; | |
177 | if (unlikely(sev->active)) | |
178 | return ret; | |
179 | ||
180 | asid = sev_asid_new(); | |
181 | if (asid < 0) | |
182 | return ret; | |
183 | ||
184 | ret = sev_platform_init(&argp->error); | |
185 | if (ret) | |
186 | goto e_free; | |
187 | ||
188 | sev->active = true; | |
189 | sev->asid = asid; | |
190 | INIT_LIST_HEAD(&sev->regions_list); | |
191 | ||
192 | return 0; | |
193 | ||
194 | e_free: | |
195 | sev_asid_free(asid); | |
196 | return ret; | |
197 | } | |
198 | ||
199 | static int sev_bind_asid(struct kvm *kvm, unsigned int handle, int *error) | |
200 | { | |
201 | struct sev_data_activate *data; | |
202 | int asid = sev_get_asid(kvm); | |
203 | int ret; | |
204 | ||
205 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
206 | if (!data) | |
207 | return -ENOMEM; | |
208 | ||
209 | /* activate ASID on the given handle */ | |
210 | data->handle = handle; | |
211 | data->asid = asid; | |
212 | ret = sev_guest_activate(data, error); | |
213 | kfree(data); | |
214 | ||
215 | return ret; | |
216 | } | |
217 | ||
218 | static int __sev_issue_cmd(int fd, int id, void *data, int *error) | |
219 | { | |
220 | struct fd f; | |
221 | int ret; | |
222 | ||
223 | f = fdget(fd); | |
224 | if (!f.file) | |
225 | return -EBADF; | |
226 | ||
227 | ret = sev_issue_cmd_external_user(f.file, id, data, error); | |
228 | ||
229 | fdput(f); | |
230 | return ret; | |
231 | } | |
232 | ||
233 | static int sev_issue_cmd(struct kvm *kvm, int id, void *data, int *error) | |
234 | { | |
235 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
236 | ||
237 | return __sev_issue_cmd(sev->fd, id, data, error); | |
238 | } | |
239 | ||
240 | static int sev_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
241 | { | |
242 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
243 | struct sev_data_launch_start *start; | |
244 | struct kvm_sev_launch_start params; | |
245 | void *dh_blob, *session_blob; | |
246 | int *error = &argp->error; | |
247 | int ret; | |
248 | ||
249 | if (!sev_guest(kvm)) | |
250 | return -ENOTTY; | |
251 | ||
252 | if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) | |
253 | return -EFAULT; | |
254 | ||
255 | start = kzalloc(sizeof(*start), GFP_KERNEL_ACCOUNT); | |
256 | if (!start) | |
257 | return -ENOMEM; | |
258 | ||
259 | dh_blob = NULL; | |
260 | if (params.dh_uaddr) { | |
261 | dh_blob = psp_copy_user_blob(params.dh_uaddr, params.dh_len); | |
262 | if (IS_ERR(dh_blob)) { | |
263 | ret = PTR_ERR(dh_blob); | |
264 | goto e_free; | |
265 | } | |
266 | ||
267 | start->dh_cert_address = __sme_set(__pa(dh_blob)); | |
268 | start->dh_cert_len = params.dh_len; | |
269 | } | |
270 | ||
271 | session_blob = NULL; | |
272 | if (params.session_uaddr) { | |
273 | session_blob = psp_copy_user_blob(params.session_uaddr, params.session_len); | |
274 | if (IS_ERR(session_blob)) { | |
275 | ret = PTR_ERR(session_blob); | |
276 | goto e_free_dh; | |
277 | } | |
278 | ||
279 | start->session_address = __sme_set(__pa(session_blob)); | |
280 | start->session_len = params.session_len; | |
281 | } | |
282 | ||
283 | start->handle = params.handle; | |
284 | start->policy = params.policy; | |
285 | ||
286 | /* create memory encryption context */ | |
287 | ret = __sev_issue_cmd(argp->sev_fd, SEV_CMD_LAUNCH_START, start, error); | |
288 | if (ret) | |
289 | goto e_free_session; | |
290 | ||
291 | /* Bind ASID to this guest */ | |
292 | ret = sev_bind_asid(kvm, start->handle, error); | |
293 | if (ret) | |
294 | goto e_free_session; | |
295 | ||
296 | /* return handle to userspace */ | |
297 | params.handle = start->handle; | |
298 | if (copy_to_user((void __user *)(uintptr_t)argp->data, ¶ms, sizeof(params))) { | |
299 | sev_unbind_asid(kvm, start->handle); | |
300 | ret = -EFAULT; | |
301 | goto e_free_session; | |
302 | } | |
303 | ||
304 | sev->handle = start->handle; | |
305 | sev->fd = argp->sev_fd; | |
306 | ||
307 | e_free_session: | |
308 | kfree(session_blob); | |
309 | e_free_dh: | |
310 | kfree(dh_blob); | |
311 | e_free: | |
312 | kfree(start); | |
313 | return ret; | |
314 | } | |
315 | ||
316 | static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr, | |
317 | unsigned long ulen, unsigned long *n, | |
318 | int write) | |
319 | { | |
320 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
78824fab JH |
321 | unsigned long npages, size; |
322 | int npinned; | |
eaf78265 JR |
323 | unsigned long locked, lock_limit; |
324 | struct page **pages; | |
325 | unsigned long first, last; | |
ff2bd9ff | 326 | int ret; |
eaf78265 JR |
327 | |
328 | if (ulen == 0 || uaddr + ulen < uaddr) | |
a8d908b5 | 329 | return ERR_PTR(-EINVAL); |
eaf78265 JR |
330 | |
331 | /* Calculate number of pages. */ | |
332 | first = (uaddr & PAGE_MASK) >> PAGE_SHIFT; | |
333 | last = ((uaddr + ulen - 1) & PAGE_MASK) >> PAGE_SHIFT; | |
334 | npages = (last - first + 1); | |
335 | ||
336 | locked = sev->pages_locked + npages; | |
337 | lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
338 | if (locked > lock_limit && !capable(CAP_IPC_LOCK)) { | |
339 | pr_err("SEV: %lu locked pages exceed the lock limit of %lu.\n", locked, lock_limit); | |
a8d908b5 | 340 | return ERR_PTR(-ENOMEM); |
eaf78265 JR |
341 | } |
342 | ||
78824fab | 343 | if (WARN_ON_ONCE(npages > INT_MAX)) |
a8d908b5 | 344 | return ERR_PTR(-EINVAL); |
78824fab | 345 | |
eaf78265 JR |
346 | /* Avoid using vmalloc for smaller buffers. */ |
347 | size = npages * sizeof(struct page *); | |
348 | if (size > PAGE_SIZE) | |
88dca4ca | 349 | pages = __vmalloc(size, GFP_KERNEL_ACCOUNT | __GFP_ZERO); |
eaf78265 JR |
350 | else |
351 | pages = kmalloc(size, GFP_KERNEL_ACCOUNT); | |
352 | ||
353 | if (!pages) | |
a8d908b5 | 354 | return ERR_PTR(-ENOMEM); |
eaf78265 JR |
355 | |
356 | /* Pin the user virtual address. */ | |
dc42c8ae | 357 | npinned = pin_user_pages_fast(uaddr, npages, write ? FOLL_WRITE : 0, pages); |
eaf78265 JR |
358 | if (npinned != npages) { |
359 | pr_err("SEV: Failure locking %lu pages.\n", npages); | |
ff2bd9ff | 360 | ret = -ENOMEM; |
eaf78265 JR |
361 | goto err; |
362 | } | |
363 | ||
364 | *n = npages; | |
365 | sev->pages_locked = locked; | |
366 | ||
367 | return pages; | |
368 | ||
369 | err: | |
ff2bd9ff | 370 | if (npinned > 0) |
dc42c8ae | 371 | unpin_user_pages(pages, npinned); |
eaf78265 JR |
372 | |
373 | kvfree(pages); | |
ff2bd9ff | 374 | return ERR_PTR(ret); |
eaf78265 JR |
375 | } |
376 | ||
377 | static void sev_unpin_memory(struct kvm *kvm, struct page **pages, | |
378 | unsigned long npages) | |
379 | { | |
380 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
381 | ||
dc42c8ae | 382 | unpin_user_pages(pages, npages); |
eaf78265 JR |
383 | kvfree(pages); |
384 | sev->pages_locked -= npages; | |
385 | } | |
386 | ||
387 | static void sev_clflush_pages(struct page *pages[], unsigned long npages) | |
388 | { | |
389 | uint8_t *page_virtual; | |
390 | unsigned long i; | |
391 | ||
e1ebb2b4 KS |
392 | if (this_cpu_has(X86_FEATURE_SME_COHERENT) || npages == 0 || |
393 | pages == NULL) | |
eaf78265 JR |
394 | return; |
395 | ||
396 | for (i = 0; i < npages; i++) { | |
397 | page_virtual = kmap_atomic(pages[i]); | |
398 | clflush_cache_range(page_virtual, PAGE_SIZE); | |
399 | kunmap_atomic(page_virtual); | |
400 | } | |
401 | } | |
402 | ||
403 | static unsigned long get_num_contig_pages(unsigned long idx, | |
404 | struct page **inpages, unsigned long npages) | |
405 | { | |
406 | unsigned long paddr, next_paddr; | |
407 | unsigned long i = idx + 1, pages = 1; | |
408 | ||
409 | /* find the number of contiguous pages starting from idx */ | |
410 | paddr = __sme_page_pa(inpages[idx]); | |
411 | while (i < npages) { | |
412 | next_paddr = __sme_page_pa(inpages[i++]); | |
413 | if ((paddr + PAGE_SIZE) == next_paddr) { | |
414 | pages++; | |
415 | paddr = next_paddr; | |
416 | continue; | |
417 | } | |
418 | break; | |
419 | } | |
420 | ||
421 | return pages; | |
422 | } | |
423 | ||
424 | static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
425 | { | |
426 | unsigned long vaddr, vaddr_end, next_vaddr, npages, pages, size, i; | |
427 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
428 | struct kvm_sev_launch_update_data params; | |
429 | struct sev_data_launch_update_data *data; | |
430 | struct page **inpages; | |
431 | int ret; | |
432 | ||
433 | if (!sev_guest(kvm)) | |
434 | return -ENOTTY; | |
435 | ||
436 | if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) | |
437 | return -EFAULT; | |
438 | ||
439 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
440 | if (!data) | |
441 | return -ENOMEM; | |
442 | ||
443 | vaddr = params.uaddr; | |
444 | size = params.len; | |
445 | vaddr_end = vaddr + size; | |
446 | ||
447 | /* Lock the user memory. */ | |
448 | inpages = sev_pin_memory(kvm, vaddr, size, &npages, 1); | |
ff2bd9ff DC |
449 | if (IS_ERR(inpages)) { |
450 | ret = PTR_ERR(inpages); | |
eaf78265 JR |
451 | goto e_free; |
452 | } | |
453 | ||
454 | /* | |
14e3dd8d PB |
455 | * Flush (on non-coherent CPUs) before LAUNCH_UPDATE encrypts pages in |
456 | * place; the cache may contain the data that was written unencrypted. | |
eaf78265 JR |
457 | */ |
458 | sev_clflush_pages(inpages, npages); | |
459 | ||
460 | for (i = 0; vaddr < vaddr_end; vaddr = next_vaddr, i += pages) { | |
461 | int offset, len; | |
462 | ||
463 | /* | |
464 | * If the user buffer is not page-aligned, calculate the offset | |
465 | * within the page. | |
466 | */ | |
467 | offset = vaddr & (PAGE_SIZE - 1); | |
468 | ||
469 | /* Calculate the number of pages that can be encrypted in one go. */ | |
470 | pages = get_num_contig_pages(i, inpages, npages); | |
471 | ||
472 | len = min_t(size_t, ((pages * PAGE_SIZE) - offset), size); | |
473 | ||
474 | data->handle = sev->handle; | |
475 | data->len = len; | |
476 | data->address = __sme_page_pa(inpages[i]) + offset; | |
477 | ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_DATA, data, &argp->error); | |
478 | if (ret) | |
479 | goto e_unpin; | |
480 | ||
481 | size -= len; | |
482 | next_vaddr = vaddr + len; | |
483 | } | |
484 | ||
485 | e_unpin: | |
486 | /* content of memory is updated, mark pages dirty */ | |
487 | for (i = 0; i < npages; i++) { | |
488 | set_page_dirty_lock(inpages[i]); | |
489 | mark_page_accessed(inpages[i]); | |
490 | } | |
491 | /* unlock the user pages */ | |
492 | sev_unpin_memory(kvm, inpages, npages); | |
493 | e_free: | |
494 | kfree(data); | |
495 | return ret; | |
496 | } | |
497 | ||
498 | static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
499 | { | |
500 | void __user *measure = (void __user *)(uintptr_t)argp->data; | |
501 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
502 | struct sev_data_launch_measure *data; | |
503 | struct kvm_sev_launch_measure params; | |
504 | void __user *p = NULL; | |
505 | void *blob = NULL; | |
506 | int ret; | |
507 | ||
508 | if (!sev_guest(kvm)) | |
509 | return -ENOTTY; | |
510 | ||
511 | if (copy_from_user(¶ms, measure, sizeof(params))) | |
512 | return -EFAULT; | |
513 | ||
514 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
515 | if (!data) | |
516 | return -ENOMEM; | |
517 | ||
518 | /* User wants to query the blob length */ | |
519 | if (!params.len) | |
520 | goto cmd; | |
521 | ||
522 | p = (void __user *)(uintptr_t)params.uaddr; | |
523 | if (p) { | |
524 | if (params.len > SEV_FW_BLOB_MAX_SIZE) { | |
525 | ret = -EINVAL; | |
526 | goto e_free; | |
527 | } | |
528 | ||
529 | ret = -ENOMEM; | |
530 | blob = kmalloc(params.len, GFP_KERNEL); | |
531 | if (!blob) | |
532 | goto e_free; | |
533 | ||
534 | data->address = __psp_pa(blob); | |
535 | data->len = params.len; | |
536 | } | |
537 | ||
538 | cmd: | |
539 | data->handle = sev->handle; | |
540 | ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_MEASURE, data, &argp->error); | |
541 | ||
542 | /* | |
543 | * If we query the session length, FW responded with expected data. | |
544 | */ | |
545 | if (!params.len) | |
546 | goto done; | |
547 | ||
548 | if (ret) | |
549 | goto e_free_blob; | |
550 | ||
551 | if (blob) { | |
552 | if (copy_to_user(p, blob, params.len)) | |
553 | ret = -EFAULT; | |
554 | } | |
555 | ||
556 | done: | |
557 | params.len = data->len; | |
558 | if (copy_to_user(measure, ¶ms, sizeof(params))) | |
559 | ret = -EFAULT; | |
560 | e_free_blob: | |
561 | kfree(blob); | |
562 | e_free: | |
563 | kfree(data); | |
564 | return ret; | |
565 | } | |
566 | ||
567 | static int sev_launch_finish(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
568 | { | |
569 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
570 | struct sev_data_launch_finish *data; | |
571 | int ret; | |
572 | ||
573 | if (!sev_guest(kvm)) | |
574 | return -ENOTTY; | |
575 | ||
576 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
577 | if (!data) | |
578 | return -ENOMEM; | |
579 | ||
580 | data->handle = sev->handle; | |
581 | ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_FINISH, data, &argp->error); | |
582 | ||
583 | kfree(data); | |
584 | return ret; | |
585 | } | |
586 | ||
587 | static int sev_guest_status(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
588 | { | |
589 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
590 | struct kvm_sev_guest_status params; | |
591 | struct sev_data_guest_status *data; | |
592 | int ret; | |
593 | ||
594 | if (!sev_guest(kvm)) | |
595 | return -ENOTTY; | |
596 | ||
597 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
598 | if (!data) | |
599 | return -ENOMEM; | |
600 | ||
601 | data->handle = sev->handle; | |
602 | ret = sev_issue_cmd(kvm, SEV_CMD_GUEST_STATUS, data, &argp->error); | |
603 | if (ret) | |
604 | goto e_free; | |
605 | ||
606 | params.policy = data->policy; | |
607 | params.state = data->state; | |
608 | params.handle = data->handle; | |
609 | ||
610 | if (copy_to_user((void __user *)(uintptr_t)argp->data, ¶ms, sizeof(params))) | |
611 | ret = -EFAULT; | |
612 | e_free: | |
613 | kfree(data); | |
614 | return ret; | |
615 | } | |
616 | ||
617 | static int __sev_issue_dbg_cmd(struct kvm *kvm, unsigned long src, | |
618 | unsigned long dst, int size, | |
619 | int *error, bool enc) | |
620 | { | |
621 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
622 | struct sev_data_dbg *data; | |
623 | int ret; | |
624 | ||
625 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
626 | if (!data) | |
627 | return -ENOMEM; | |
628 | ||
629 | data->handle = sev->handle; | |
630 | data->dst_addr = dst; | |
631 | data->src_addr = src; | |
632 | data->len = size; | |
633 | ||
634 | ret = sev_issue_cmd(kvm, | |
635 | enc ? SEV_CMD_DBG_ENCRYPT : SEV_CMD_DBG_DECRYPT, | |
636 | data, error); | |
637 | kfree(data); | |
638 | return ret; | |
639 | } | |
640 | ||
641 | static int __sev_dbg_decrypt(struct kvm *kvm, unsigned long src_paddr, | |
642 | unsigned long dst_paddr, int sz, int *err) | |
643 | { | |
644 | int offset; | |
645 | ||
646 | /* | |
647 | * Its safe to read more than we are asked, caller should ensure that | |
648 | * destination has enough space. | |
649 | */ | |
650 | src_paddr = round_down(src_paddr, 16); | |
651 | offset = src_paddr & 15; | |
652 | sz = round_up(sz + offset, 16); | |
653 | ||
654 | return __sev_issue_dbg_cmd(kvm, src_paddr, dst_paddr, sz, err, false); | |
655 | } | |
656 | ||
657 | static int __sev_dbg_decrypt_user(struct kvm *kvm, unsigned long paddr, | |
658 | unsigned long __user dst_uaddr, | |
659 | unsigned long dst_paddr, | |
660 | int size, int *err) | |
661 | { | |
662 | struct page *tpage = NULL; | |
663 | int ret, offset; | |
664 | ||
665 | /* if inputs are not 16-byte then use intermediate buffer */ | |
666 | if (!IS_ALIGNED(dst_paddr, 16) || | |
667 | !IS_ALIGNED(paddr, 16) || | |
668 | !IS_ALIGNED(size, 16)) { | |
669 | tpage = (void *)alloc_page(GFP_KERNEL); | |
670 | if (!tpage) | |
671 | return -ENOMEM; | |
672 | ||
673 | dst_paddr = __sme_page_pa(tpage); | |
674 | } | |
675 | ||
676 | ret = __sev_dbg_decrypt(kvm, paddr, dst_paddr, size, err); | |
677 | if (ret) | |
678 | goto e_free; | |
679 | ||
680 | if (tpage) { | |
681 | offset = paddr & 15; | |
682 | if (copy_to_user((void __user *)(uintptr_t)dst_uaddr, | |
683 | page_address(tpage) + offset, size)) | |
684 | ret = -EFAULT; | |
685 | } | |
686 | ||
687 | e_free: | |
688 | if (tpage) | |
689 | __free_page(tpage); | |
690 | ||
691 | return ret; | |
692 | } | |
693 | ||
694 | static int __sev_dbg_encrypt_user(struct kvm *kvm, unsigned long paddr, | |
695 | unsigned long __user vaddr, | |
696 | unsigned long dst_paddr, | |
697 | unsigned long __user dst_vaddr, | |
698 | int size, int *error) | |
699 | { | |
700 | struct page *src_tpage = NULL; | |
701 | struct page *dst_tpage = NULL; | |
702 | int ret, len = size; | |
703 | ||
704 | /* If source buffer is not aligned then use an intermediate buffer */ | |
705 | if (!IS_ALIGNED(vaddr, 16)) { | |
706 | src_tpage = alloc_page(GFP_KERNEL); | |
707 | if (!src_tpage) | |
708 | return -ENOMEM; | |
709 | ||
710 | if (copy_from_user(page_address(src_tpage), | |
711 | (void __user *)(uintptr_t)vaddr, size)) { | |
712 | __free_page(src_tpage); | |
713 | return -EFAULT; | |
714 | } | |
715 | ||
716 | paddr = __sme_page_pa(src_tpage); | |
717 | } | |
718 | ||
719 | /* | |
720 | * If destination buffer or length is not aligned then do read-modify-write: | |
721 | * - decrypt destination in an intermediate buffer | |
722 | * - copy the source buffer in an intermediate buffer | |
723 | * - use the intermediate buffer as source buffer | |
724 | */ | |
725 | if (!IS_ALIGNED(dst_vaddr, 16) || !IS_ALIGNED(size, 16)) { | |
726 | int dst_offset; | |
727 | ||
728 | dst_tpage = alloc_page(GFP_KERNEL); | |
729 | if (!dst_tpage) { | |
730 | ret = -ENOMEM; | |
731 | goto e_free; | |
732 | } | |
733 | ||
734 | ret = __sev_dbg_decrypt(kvm, dst_paddr, | |
735 | __sme_page_pa(dst_tpage), size, error); | |
736 | if (ret) | |
737 | goto e_free; | |
738 | ||
739 | /* | |
740 | * If source is kernel buffer then use memcpy() otherwise | |
741 | * copy_from_user(). | |
742 | */ | |
743 | dst_offset = dst_paddr & 15; | |
744 | ||
745 | if (src_tpage) | |
746 | memcpy(page_address(dst_tpage) + dst_offset, | |
747 | page_address(src_tpage), size); | |
748 | else { | |
749 | if (copy_from_user(page_address(dst_tpage) + dst_offset, | |
750 | (void __user *)(uintptr_t)vaddr, size)) { | |
751 | ret = -EFAULT; | |
752 | goto e_free; | |
753 | } | |
754 | } | |
755 | ||
756 | paddr = __sme_page_pa(dst_tpage); | |
757 | dst_paddr = round_down(dst_paddr, 16); | |
758 | len = round_up(size, 16); | |
759 | } | |
760 | ||
761 | ret = __sev_issue_dbg_cmd(kvm, paddr, dst_paddr, len, error, true); | |
762 | ||
763 | e_free: | |
764 | if (src_tpage) | |
765 | __free_page(src_tpage); | |
766 | if (dst_tpage) | |
767 | __free_page(dst_tpage); | |
768 | return ret; | |
769 | } | |
770 | ||
771 | static int sev_dbg_crypt(struct kvm *kvm, struct kvm_sev_cmd *argp, bool dec) | |
772 | { | |
773 | unsigned long vaddr, vaddr_end, next_vaddr; | |
774 | unsigned long dst_vaddr; | |
775 | struct page **src_p, **dst_p; | |
776 | struct kvm_sev_dbg debug; | |
777 | unsigned long n; | |
778 | unsigned int size; | |
779 | int ret; | |
780 | ||
781 | if (!sev_guest(kvm)) | |
782 | return -ENOTTY; | |
783 | ||
784 | if (copy_from_user(&debug, (void __user *)(uintptr_t)argp->data, sizeof(debug))) | |
785 | return -EFAULT; | |
786 | ||
787 | if (!debug.len || debug.src_uaddr + debug.len < debug.src_uaddr) | |
788 | return -EINVAL; | |
789 | if (!debug.dst_uaddr) | |
790 | return -EINVAL; | |
791 | ||
792 | vaddr = debug.src_uaddr; | |
793 | size = debug.len; | |
794 | vaddr_end = vaddr + size; | |
795 | dst_vaddr = debug.dst_uaddr; | |
796 | ||
797 | for (; vaddr < vaddr_end; vaddr = next_vaddr) { | |
798 | int len, s_off, d_off; | |
799 | ||
800 | /* lock userspace source and destination page */ | |
801 | src_p = sev_pin_memory(kvm, vaddr & PAGE_MASK, PAGE_SIZE, &n, 0); | |
ff2bd9ff DC |
802 | if (IS_ERR(src_p)) |
803 | return PTR_ERR(src_p); | |
eaf78265 JR |
804 | |
805 | dst_p = sev_pin_memory(kvm, dst_vaddr & PAGE_MASK, PAGE_SIZE, &n, 1); | |
ff2bd9ff | 806 | if (IS_ERR(dst_p)) { |
eaf78265 | 807 | sev_unpin_memory(kvm, src_p, n); |
ff2bd9ff | 808 | return PTR_ERR(dst_p); |
eaf78265 JR |
809 | } |
810 | ||
811 | /* | |
14e3dd8d PB |
812 | * Flush (on non-coherent CPUs) before DBG_{DE,EN}CRYPT read or modify |
813 | * the pages; flush the destination too so that future accesses do not | |
814 | * see stale data. | |
eaf78265 JR |
815 | */ |
816 | sev_clflush_pages(src_p, 1); | |
817 | sev_clflush_pages(dst_p, 1); | |
818 | ||
819 | /* | |
820 | * Since user buffer may not be page aligned, calculate the | |
821 | * offset within the page. | |
822 | */ | |
823 | s_off = vaddr & ~PAGE_MASK; | |
824 | d_off = dst_vaddr & ~PAGE_MASK; | |
825 | len = min_t(size_t, (PAGE_SIZE - s_off), size); | |
826 | ||
827 | if (dec) | |
828 | ret = __sev_dbg_decrypt_user(kvm, | |
829 | __sme_page_pa(src_p[0]) + s_off, | |
830 | dst_vaddr, | |
831 | __sme_page_pa(dst_p[0]) + d_off, | |
832 | len, &argp->error); | |
833 | else | |
834 | ret = __sev_dbg_encrypt_user(kvm, | |
835 | __sme_page_pa(src_p[0]) + s_off, | |
836 | vaddr, | |
837 | __sme_page_pa(dst_p[0]) + d_off, | |
838 | dst_vaddr, | |
839 | len, &argp->error); | |
840 | ||
841 | sev_unpin_memory(kvm, src_p, n); | |
842 | sev_unpin_memory(kvm, dst_p, n); | |
843 | ||
844 | if (ret) | |
845 | goto err; | |
846 | ||
847 | next_vaddr = vaddr + len; | |
848 | dst_vaddr = dst_vaddr + len; | |
849 | size -= len; | |
850 | } | |
851 | err: | |
852 | return ret; | |
853 | } | |
854 | ||
855 | static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp) | |
856 | { | |
857 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
858 | struct sev_data_launch_secret *data; | |
859 | struct kvm_sev_launch_secret params; | |
860 | struct page **pages; | |
861 | void *blob, *hdr; | |
50085bee | 862 | unsigned long n, i; |
eaf78265 JR |
863 | int ret, offset; |
864 | ||
865 | if (!sev_guest(kvm)) | |
866 | return -ENOTTY; | |
867 | ||
868 | if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) | |
869 | return -EFAULT; | |
870 | ||
871 | pages = sev_pin_memory(kvm, params.guest_uaddr, params.guest_len, &n, 1); | |
a8d908b5 PB |
872 | if (IS_ERR(pages)) |
873 | return PTR_ERR(pages); | |
eaf78265 | 874 | |
50085bee | 875 | /* |
14e3dd8d PB |
876 | * Flush (on non-coherent CPUs) before LAUNCH_SECRET encrypts pages in |
877 | * place; the cache may contain the data that was written unencrypted. | |
50085bee CC |
878 | */ |
879 | sev_clflush_pages(pages, n); | |
880 | ||
eaf78265 JR |
881 | /* |
882 | * The secret must be copied into contiguous memory region, lets verify | |
883 | * that userspace memory pages are contiguous before we issue command. | |
884 | */ | |
885 | if (get_num_contig_pages(0, pages, n) != n) { | |
886 | ret = -EINVAL; | |
887 | goto e_unpin_memory; | |
888 | } | |
889 | ||
890 | ret = -ENOMEM; | |
891 | data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); | |
892 | if (!data) | |
893 | goto e_unpin_memory; | |
894 | ||
895 | offset = params.guest_uaddr & (PAGE_SIZE - 1); | |
896 | data->guest_address = __sme_page_pa(pages[0]) + offset; | |
897 | data->guest_len = params.guest_len; | |
898 | ||
899 | blob = psp_copy_user_blob(params.trans_uaddr, params.trans_len); | |
900 | if (IS_ERR(blob)) { | |
901 | ret = PTR_ERR(blob); | |
902 | goto e_free; | |
903 | } | |
904 | ||
905 | data->trans_address = __psp_pa(blob); | |
906 | data->trans_len = params.trans_len; | |
907 | ||
908 | hdr = psp_copy_user_blob(params.hdr_uaddr, params.hdr_len); | |
909 | if (IS_ERR(hdr)) { | |
910 | ret = PTR_ERR(hdr); | |
911 | goto e_free_blob; | |
912 | } | |
913 | data->hdr_address = __psp_pa(hdr); | |
914 | data->hdr_len = params.hdr_len; | |
915 | ||
916 | data->handle = sev->handle; | |
917 | ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_SECRET, data, &argp->error); | |
918 | ||
919 | kfree(hdr); | |
920 | ||
921 | e_free_blob: | |
922 | kfree(blob); | |
923 | e_free: | |
924 | kfree(data); | |
925 | e_unpin_memory: | |
50085bee CC |
926 | /* content of memory is updated, mark pages dirty */ |
927 | for (i = 0; i < n; i++) { | |
928 | set_page_dirty_lock(pages[i]); | |
929 | mark_page_accessed(pages[i]); | |
930 | } | |
eaf78265 JR |
931 | sev_unpin_memory(kvm, pages, n); |
932 | return ret; | |
933 | } | |
934 | ||
935 | int svm_mem_enc_op(struct kvm *kvm, void __user *argp) | |
936 | { | |
937 | struct kvm_sev_cmd sev_cmd; | |
938 | int r; | |
939 | ||
916391a2 | 940 | if (!svm_sev_enabled() || !sev) |
eaf78265 JR |
941 | return -ENOTTY; |
942 | ||
943 | if (!argp) | |
944 | return 0; | |
945 | ||
946 | if (copy_from_user(&sev_cmd, argp, sizeof(struct kvm_sev_cmd))) | |
947 | return -EFAULT; | |
948 | ||
949 | mutex_lock(&kvm->lock); | |
950 | ||
951 | switch (sev_cmd.id) { | |
952 | case KVM_SEV_INIT: | |
953 | r = sev_guest_init(kvm, &sev_cmd); | |
954 | break; | |
955 | case KVM_SEV_LAUNCH_START: | |
956 | r = sev_launch_start(kvm, &sev_cmd); | |
957 | break; | |
958 | case KVM_SEV_LAUNCH_UPDATE_DATA: | |
959 | r = sev_launch_update_data(kvm, &sev_cmd); | |
960 | break; | |
961 | case KVM_SEV_LAUNCH_MEASURE: | |
962 | r = sev_launch_measure(kvm, &sev_cmd); | |
963 | break; | |
964 | case KVM_SEV_LAUNCH_FINISH: | |
965 | r = sev_launch_finish(kvm, &sev_cmd); | |
966 | break; | |
967 | case KVM_SEV_GUEST_STATUS: | |
968 | r = sev_guest_status(kvm, &sev_cmd); | |
969 | break; | |
970 | case KVM_SEV_DBG_DECRYPT: | |
971 | r = sev_dbg_crypt(kvm, &sev_cmd, true); | |
972 | break; | |
973 | case KVM_SEV_DBG_ENCRYPT: | |
974 | r = sev_dbg_crypt(kvm, &sev_cmd, false); | |
975 | break; | |
976 | case KVM_SEV_LAUNCH_SECRET: | |
977 | r = sev_launch_secret(kvm, &sev_cmd); | |
978 | break; | |
979 | default: | |
980 | r = -EINVAL; | |
981 | goto out; | |
982 | } | |
983 | ||
984 | if (copy_to_user(argp, &sev_cmd, sizeof(struct kvm_sev_cmd))) | |
985 | r = -EFAULT; | |
986 | ||
987 | out: | |
988 | mutex_unlock(&kvm->lock); | |
989 | return r; | |
990 | } | |
991 | ||
992 | int svm_register_enc_region(struct kvm *kvm, | |
993 | struct kvm_enc_region *range) | |
994 | { | |
995 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
996 | struct enc_region *region; | |
997 | int ret = 0; | |
998 | ||
999 | if (!sev_guest(kvm)) | |
1000 | return -ENOTTY; | |
1001 | ||
1002 | if (range->addr > ULONG_MAX || range->size > ULONG_MAX) | |
1003 | return -EINVAL; | |
1004 | ||
1005 | region = kzalloc(sizeof(*region), GFP_KERNEL_ACCOUNT); | |
1006 | if (!region) | |
1007 | return -ENOMEM; | |
1008 | ||
1009 | region->pages = sev_pin_memory(kvm, range->addr, range->size, ®ion->npages, 1); | |
a8d908b5 PB |
1010 | if (IS_ERR(region->pages)) { |
1011 | ret = PTR_ERR(region->pages); | |
eaf78265 JR |
1012 | goto e_free; |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * The guest may change the memory encryption attribute from C=0 -> C=1 | |
1017 | * or vice versa for this memory range. Lets make sure caches are | |
1018 | * flushed to ensure that guest data gets written into memory with | |
1019 | * correct C-bit. | |
1020 | */ | |
1021 | sev_clflush_pages(region->pages, region->npages); | |
1022 | ||
1023 | region->uaddr = range->addr; | |
1024 | region->size = range->size; | |
1025 | ||
1026 | mutex_lock(&kvm->lock); | |
1027 | list_add_tail(®ion->list, &sev->regions_list); | |
1028 | mutex_unlock(&kvm->lock); | |
1029 | ||
1030 | return ret; | |
1031 | ||
1032 | e_free: | |
1033 | kfree(region); | |
1034 | return ret; | |
1035 | } | |
1036 | ||
1037 | static struct enc_region * | |
1038 | find_enc_region(struct kvm *kvm, struct kvm_enc_region *range) | |
1039 | { | |
1040 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
1041 | struct list_head *head = &sev->regions_list; | |
1042 | struct enc_region *i; | |
1043 | ||
1044 | list_for_each_entry(i, head, list) { | |
1045 | if (i->uaddr == range->addr && | |
1046 | i->size == range->size) | |
1047 | return i; | |
1048 | } | |
1049 | ||
1050 | return NULL; | |
1051 | } | |
1052 | ||
1053 | static void __unregister_enc_region_locked(struct kvm *kvm, | |
1054 | struct enc_region *region) | |
1055 | { | |
1056 | sev_unpin_memory(kvm, region->pages, region->npages); | |
1057 | list_del(®ion->list); | |
1058 | kfree(region); | |
1059 | } | |
1060 | ||
1061 | int svm_unregister_enc_region(struct kvm *kvm, | |
1062 | struct kvm_enc_region *range) | |
1063 | { | |
1064 | struct enc_region *region; | |
1065 | int ret; | |
1066 | ||
1067 | mutex_lock(&kvm->lock); | |
1068 | ||
1069 | if (!sev_guest(kvm)) { | |
1070 | ret = -ENOTTY; | |
1071 | goto failed; | |
1072 | } | |
1073 | ||
1074 | region = find_enc_region(kvm, range); | |
1075 | if (!region) { | |
1076 | ret = -EINVAL; | |
1077 | goto failed; | |
1078 | } | |
1079 | ||
1080 | /* | |
1081 | * Ensure that all guest tagged cache entries are flushed before | |
1082 | * releasing the pages back to the system for use. CLFLUSH will | |
1083 | * not do this, so issue a WBINVD. | |
1084 | */ | |
1085 | wbinvd_on_all_cpus(); | |
1086 | ||
1087 | __unregister_enc_region_locked(kvm, region); | |
1088 | ||
1089 | mutex_unlock(&kvm->lock); | |
1090 | return 0; | |
1091 | ||
1092 | failed: | |
1093 | mutex_unlock(&kvm->lock); | |
1094 | return ret; | |
1095 | } | |
1096 | ||
1097 | void sev_vm_destroy(struct kvm *kvm) | |
1098 | { | |
1099 | struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; | |
1100 | struct list_head *head = &sev->regions_list; | |
1101 | struct list_head *pos, *q; | |
1102 | ||
1103 | if (!sev_guest(kvm)) | |
1104 | return; | |
1105 | ||
1106 | mutex_lock(&kvm->lock); | |
1107 | ||
1108 | /* | |
1109 | * Ensure that all guest tagged cache entries are flushed before | |
1110 | * releasing the pages back to the system for use. CLFLUSH will | |
1111 | * not do this, so issue a WBINVD. | |
1112 | */ | |
1113 | wbinvd_on_all_cpus(); | |
1114 | ||
1115 | /* | |
1116 | * if userspace was terminated before unregistering the memory regions | |
1117 | * then lets unpin all the registered memory. | |
1118 | */ | |
1119 | if (!list_empty(head)) { | |
1120 | list_for_each_safe(pos, q, head) { | |
1121 | __unregister_enc_region_locked(kvm, | |
1122 | list_entry(pos, struct enc_region, list)); | |
7be74942 | 1123 | cond_resched(); |
eaf78265 JR |
1124 | } |
1125 | } | |
1126 | ||
1127 | mutex_unlock(&kvm->lock); | |
1128 | ||
1129 | sev_unbind_asid(kvm, sev->handle); | |
1130 | sev_asid_free(sev->asid); | |
1131 | } | |
1132 | ||
916391a2 | 1133 | void __init sev_hardware_setup(void) |
eaf78265 | 1134 | { |
916391a2 TL |
1135 | unsigned int eax, ebx, ecx, edx; |
1136 | bool sev_es_supported = false; | |
1137 | bool sev_supported = false; | |
1138 | ||
1139 | /* Does the CPU support SEV? */ | |
1140 | if (!boot_cpu_has(X86_FEATURE_SEV)) | |
1141 | goto out; | |
1142 | ||
1143 | /* Retrieve SEV CPUID information */ | |
1144 | cpuid(0x8000001f, &eax, &ebx, &ecx, &edx); | |
1145 | ||
1edc1459 TL |
1146 | /* Set encryption bit location for SEV-ES guests */ |
1147 | sev_enc_bit = ebx & 0x3f; | |
1148 | ||
eaf78265 | 1149 | /* Maximum number of encrypted guests supported simultaneously */ |
916391a2 | 1150 | max_sev_asid = ecx; |
eaf78265 | 1151 | |
9ef1530c | 1152 | if (!svm_sev_enabled()) |
916391a2 | 1153 | goto out; |
eaf78265 JR |
1154 | |
1155 | /* Minimum ASID value that should be used for SEV guest */ | |
916391a2 | 1156 | min_sev_asid = edx; |
eaf78265 JR |
1157 | |
1158 | /* Initialize SEV ASID bitmaps */ | |
1159 | sev_asid_bitmap = bitmap_zalloc(max_sev_asid, GFP_KERNEL); | |
1160 | if (!sev_asid_bitmap) | |
916391a2 | 1161 | goto out; |
eaf78265 JR |
1162 | |
1163 | sev_reclaim_asid_bitmap = bitmap_zalloc(max_sev_asid, GFP_KERNEL); | |
1164 | if (!sev_reclaim_asid_bitmap) | |
916391a2 | 1165 | goto out; |
eaf78265 | 1166 | |
916391a2 TL |
1167 | pr_info("SEV supported: %u ASIDs\n", max_sev_asid - min_sev_asid + 1); |
1168 | sev_supported = true; | |
eaf78265 | 1169 | |
916391a2 TL |
1170 | /* SEV-ES support requested? */ |
1171 | if (!sev_es) | |
1172 | goto out; | |
1173 | ||
1174 | /* Does the CPU support SEV-ES? */ | |
1175 | if (!boot_cpu_has(X86_FEATURE_SEV_ES)) | |
1176 | goto out; | |
1177 | ||
1178 | /* Has the system been allocated ASIDs for SEV-ES? */ | |
1179 | if (min_sev_asid == 1) | |
1180 | goto out; | |
1181 | ||
1182 | pr_info("SEV-ES supported: %u ASIDs\n", min_sev_asid - 1); | |
1183 | sev_es_supported = true; | |
1184 | ||
1185 | out: | |
1186 | sev = sev_supported; | |
1187 | sev_es = sev_es_supported; | |
eaf78265 JR |
1188 | } |
1189 | ||
1190 | void sev_hardware_teardown(void) | |
1191 | { | |
9ef1530c PB |
1192 | if (!svm_sev_enabled()) |
1193 | return; | |
1194 | ||
eaf78265 JR |
1195 | bitmap_free(sev_asid_bitmap); |
1196 | bitmap_free(sev_reclaim_asid_bitmap); | |
1197 | ||
1198 | sev_flush_asids(); | |
1199 | } | |
1200 | ||
add5e2f0 TL |
1201 | /* |
1202 | * Pages used by hardware to hold guest encrypted state must be flushed before | |
1203 | * returning them to the system. | |
1204 | */ | |
1205 | static void sev_flush_guest_memory(struct vcpu_svm *svm, void *va, | |
1206 | unsigned long len) | |
1207 | { | |
1208 | /* | |
1209 | * If hardware enforced cache coherency for encrypted mappings of the | |
1210 | * same physical page is supported, nothing to do. | |
1211 | */ | |
1212 | if (boot_cpu_has(X86_FEATURE_SME_COHERENT)) | |
1213 | return; | |
1214 | ||
1215 | /* | |
1216 | * If the VM Page Flush MSR is supported, use it to flush the page | |
1217 | * (using the page virtual address and the guest ASID). | |
1218 | */ | |
1219 | if (boot_cpu_has(X86_FEATURE_VM_PAGE_FLUSH)) { | |
1220 | struct kvm_sev_info *sev; | |
1221 | unsigned long va_start; | |
1222 | u64 start, stop; | |
1223 | ||
1224 | /* Align start and stop to page boundaries. */ | |
1225 | va_start = (unsigned long)va; | |
1226 | start = (u64)va_start & PAGE_MASK; | |
1227 | stop = PAGE_ALIGN((u64)va_start + len); | |
1228 | ||
1229 | if (start < stop) { | |
1230 | sev = &to_kvm_svm(svm->vcpu.kvm)->sev_info; | |
1231 | ||
1232 | while (start < stop) { | |
1233 | wrmsrl(MSR_AMD64_VM_PAGE_FLUSH, | |
1234 | start | sev->asid); | |
1235 | ||
1236 | start += PAGE_SIZE; | |
1237 | } | |
1238 | ||
1239 | return; | |
1240 | } | |
1241 | ||
1242 | WARN(1, "Address overflow, using WBINVD\n"); | |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * Hardware should always have one of the above features, | |
1247 | * but if not, use WBINVD and issue a warning. | |
1248 | */ | |
1249 | WARN_ONCE(1, "Using WBINVD to flush guest memory\n"); | |
1250 | wbinvd_on_all_cpus(); | |
1251 | } | |
1252 | ||
1253 | void sev_free_vcpu(struct kvm_vcpu *vcpu) | |
1254 | { | |
1255 | struct vcpu_svm *svm; | |
1256 | ||
1257 | if (!sev_es_guest(vcpu->kvm)) | |
1258 | return; | |
1259 | ||
1260 | svm = to_svm(vcpu); | |
1261 | ||
1262 | if (vcpu->arch.guest_state_protected) | |
1263 | sev_flush_guest_memory(svm, svm->vmsa, PAGE_SIZE); | |
1264 | __free_page(virt_to_page(svm->vmsa)); | |
1265 | } | |
1266 | ||
291bd20d TL |
1267 | static void dump_ghcb(struct vcpu_svm *svm) |
1268 | { | |
1269 | struct ghcb *ghcb = svm->ghcb; | |
1270 | unsigned int nbits; | |
1271 | ||
1272 | /* Re-use the dump_invalid_vmcb module parameter */ | |
1273 | if (!dump_invalid_vmcb) { | |
1274 | pr_warn_ratelimited("set kvm_amd.dump_invalid_vmcb=1 to dump internal KVM state.\n"); | |
1275 | return; | |
1276 | } | |
1277 | ||
1278 | nbits = sizeof(ghcb->save.valid_bitmap) * 8; | |
1279 | ||
1280 | pr_err("GHCB (GPA=%016llx):\n", svm->vmcb->control.ghcb_gpa); | |
1281 | pr_err("%-20s%016llx is_valid: %u\n", "sw_exit_code", | |
1282 | ghcb->save.sw_exit_code, ghcb_sw_exit_code_is_valid(ghcb)); | |
1283 | pr_err("%-20s%016llx is_valid: %u\n", "sw_exit_info_1", | |
1284 | ghcb->save.sw_exit_info_1, ghcb_sw_exit_info_1_is_valid(ghcb)); | |
1285 | pr_err("%-20s%016llx is_valid: %u\n", "sw_exit_info_2", | |
1286 | ghcb->save.sw_exit_info_2, ghcb_sw_exit_info_2_is_valid(ghcb)); | |
1287 | pr_err("%-20s%016llx is_valid: %u\n", "sw_scratch", | |
1288 | ghcb->save.sw_scratch, ghcb_sw_scratch_is_valid(ghcb)); | |
1289 | pr_err("%-20s%*pb\n", "valid_bitmap", nbits, ghcb->save.valid_bitmap); | |
1290 | } | |
1291 | ||
1292 | static void sev_es_sync_to_ghcb(struct vcpu_svm *svm) | |
1293 | { | |
1294 | struct kvm_vcpu *vcpu = &svm->vcpu; | |
1295 | struct ghcb *ghcb = svm->ghcb; | |
1296 | ||
1297 | /* | |
1298 | * The GHCB protocol so far allows for the following data | |
1299 | * to be returned: | |
1300 | * GPRs RAX, RBX, RCX, RDX | |
1301 | * | |
1302 | * Copy their values to the GHCB if they are dirty. | |
1303 | */ | |
1304 | if (kvm_register_is_dirty(vcpu, VCPU_REGS_RAX)) | |
1305 | ghcb_set_rax(ghcb, vcpu->arch.regs[VCPU_REGS_RAX]); | |
1306 | if (kvm_register_is_dirty(vcpu, VCPU_REGS_RBX)) | |
1307 | ghcb_set_rbx(ghcb, vcpu->arch.regs[VCPU_REGS_RBX]); | |
1308 | if (kvm_register_is_dirty(vcpu, VCPU_REGS_RCX)) | |
1309 | ghcb_set_rcx(ghcb, vcpu->arch.regs[VCPU_REGS_RCX]); | |
1310 | if (kvm_register_is_dirty(vcpu, VCPU_REGS_RDX)) | |
1311 | ghcb_set_rdx(ghcb, vcpu->arch.regs[VCPU_REGS_RDX]); | |
1312 | } | |
1313 | ||
1314 | static void sev_es_sync_from_ghcb(struct vcpu_svm *svm) | |
1315 | { | |
1316 | struct vmcb_control_area *control = &svm->vmcb->control; | |
1317 | struct kvm_vcpu *vcpu = &svm->vcpu; | |
1318 | struct ghcb *ghcb = svm->ghcb; | |
1319 | u64 exit_code; | |
1320 | ||
1321 | /* | |
1322 | * The GHCB protocol so far allows for the following data | |
1323 | * to be supplied: | |
1324 | * GPRs RAX, RBX, RCX, RDX | |
1325 | * XCR0 | |
1326 | * CPL | |
1327 | * | |
1328 | * VMMCALL allows the guest to provide extra registers. KVM also | |
1329 | * expects RSI for hypercalls, so include that, too. | |
1330 | * | |
1331 | * Copy their values to the appropriate location if supplied. | |
1332 | */ | |
1333 | memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs)); | |
1334 | ||
1335 | vcpu->arch.regs[VCPU_REGS_RAX] = ghcb_get_rax_if_valid(ghcb); | |
1336 | vcpu->arch.regs[VCPU_REGS_RBX] = ghcb_get_rbx_if_valid(ghcb); | |
1337 | vcpu->arch.regs[VCPU_REGS_RCX] = ghcb_get_rcx_if_valid(ghcb); | |
1338 | vcpu->arch.regs[VCPU_REGS_RDX] = ghcb_get_rdx_if_valid(ghcb); | |
1339 | vcpu->arch.regs[VCPU_REGS_RSI] = ghcb_get_rsi_if_valid(ghcb); | |
1340 | ||
1341 | svm->vmcb->save.cpl = ghcb_get_cpl_if_valid(ghcb); | |
1342 | ||
1343 | if (ghcb_xcr0_is_valid(ghcb)) { | |
1344 | vcpu->arch.xcr0 = ghcb_get_xcr0(ghcb); | |
1345 | kvm_update_cpuid_runtime(vcpu); | |
1346 | } | |
1347 | ||
1348 | /* Copy the GHCB exit information into the VMCB fields */ | |
1349 | exit_code = ghcb_get_sw_exit_code(ghcb); | |
1350 | control->exit_code = lower_32_bits(exit_code); | |
1351 | control->exit_code_hi = upper_32_bits(exit_code); | |
1352 | control->exit_info_1 = ghcb_get_sw_exit_info_1(ghcb); | |
1353 | control->exit_info_2 = ghcb_get_sw_exit_info_2(ghcb); | |
1354 | ||
1355 | /* Clear the valid entries fields */ | |
1356 | memset(ghcb->save.valid_bitmap, 0, sizeof(ghcb->save.valid_bitmap)); | |
1357 | } | |
1358 | ||
1359 | static int sev_es_validate_vmgexit(struct vcpu_svm *svm) | |
1360 | { | |
1361 | struct kvm_vcpu *vcpu; | |
1362 | struct ghcb *ghcb; | |
1363 | u64 exit_code = 0; | |
1364 | ||
1365 | ghcb = svm->ghcb; | |
1366 | ||
1367 | /* Only GHCB Usage code 0 is supported */ | |
1368 | if (ghcb->ghcb_usage) | |
1369 | goto vmgexit_err; | |
1370 | ||
1371 | /* | |
1372 | * Retrieve the exit code now even though is may not be marked valid | |
1373 | * as it could help with debugging. | |
1374 | */ | |
1375 | exit_code = ghcb_get_sw_exit_code(ghcb); | |
1376 | ||
1377 | if (!ghcb_sw_exit_code_is_valid(ghcb) || | |
1378 | !ghcb_sw_exit_info_1_is_valid(ghcb) || | |
1379 | !ghcb_sw_exit_info_2_is_valid(ghcb)) | |
1380 | goto vmgexit_err; | |
1381 | ||
1382 | switch (ghcb_get_sw_exit_code(ghcb)) { | |
1383 | case SVM_EXIT_READ_DR7: | |
1384 | break; | |
1385 | case SVM_EXIT_WRITE_DR7: | |
1386 | if (!ghcb_rax_is_valid(ghcb)) | |
1387 | goto vmgexit_err; | |
1388 | break; | |
1389 | case SVM_EXIT_RDTSC: | |
1390 | break; | |
1391 | case SVM_EXIT_RDPMC: | |
1392 | if (!ghcb_rcx_is_valid(ghcb)) | |
1393 | goto vmgexit_err; | |
1394 | break; | |
1395 | case SVM_EXIT_CPUID: | |
1396 | if (!ghcb_rax_is_valid(ghcb) || | |
1397 | !ghcb_rcx_is_valid(ghcb)) | |
1398 | goto vmgexit_err; | |
1399 | if (ghcb_get_rax(ghcb) == 0xd) | |
1400 | if (!ghcb_xcr0_is_valid(ghcb)) | |
1401 | goto vmgexit_err; | |
1402 | break; | |
1403 | case SVM_EXIT_INVD: | |
1404 | break; | |
1405 | case SVM_EXIT_IOIO: | |
1406 | if (!(ghcb_get_sw_exit_info_1(ghcb) & SVM_IOIO_TYPE_MASK)) | |
1407 | if (!ghcb_rax_is_valid(ghcb)) | |
1408 | goto vmgexit_err; | |
1409 | break; | |
1410 | case SVM_EXIT_MSR: | |
1411 | if (!ghcb_rcx_is_valid(ghcb)) | |
1412 | goto vmgexit_err; | |
1413 | if (ghcb_get_sw_exit_info_1(ghcb)) { | |
1414 | if (!ghcb_rax_is_valid(ghcb) || | |
1415 | !ghcb_rdx_is_valid(ghcb)) | |
1416 | goto vmgexit_err; | |
1417 | } | |
1418 | break; | |
1419 | case SVM_EXIT_VMMCALL: | |
1420 | if (!ghcb_rax_is_valid(ghcb) || | |
1421 | !ghcb_cpl_is_valid(ghcb)) | |
1422 | goto vmgexit_err; | |
1423 | break; | |
1424 | case SVM_EXIT_RDTSCP: | |
1425 | break; | |
1426 | case SVM_EXIT_WBINVD: | |
1427 | break; | |
1428 | case SVM_EXIT_MONITOR: | |
1429 | if (!ghcb_rax_is_valid(ghcb) || | |
1430 | !ghcb_rcx_is_valid(ghcb) || | |
1431 | !ghcb_rdx_is_valid(ghcb)) | |
1432 | goto vmgexit_err; | |
1433 | break; | |
1434 | case SVM_EXIT_MWAIT: | |
1435 | if (!ghcb_rax_is_valid(ghcb) || | |
1436 | !ghcb_rcx_is_valid(ghcb)) | |
1437 | goto vmgexit_err; | |
1438 | break; | |
1439 | case SVM_VMGEXIT_UNSUPPORTED_EVENT: | |
1440 | break; | |
1441 | default: | |
1442 | goto vmgexit_err; | |
1443 | } | |
1444 | ||
1445 | return 0; | |
1446 | ||
1447 | vmgexit_err: | |
1448 | vcpu = &svm->vcpu; | |
1449 | ||
1450 | if (ghcb->ghcb_usage) { | |
1451 | vcpu_unimpl(vcpu, "vmgexit: ghcb usage %#x is not valid\n", | |
1452 | ghcb->ghcb_usage); | |
1453 | } else { | |
1454 | vcpu_unimpl(vcpu, "vmgexit: exit reason %#llx is not valid\n", | |
1455 | exit_code); | |
1456 | dump_ghcb(svm); | |
1457 | } | |
1458 | ||
1459 | vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
1460 | vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_UNEXPECTED_EXIT_REASON; | |
1461 | vcpu->run->internal.ndata = 2; | |
1462 | vcpu->run->internal.data[0] = exit_code; | |
1463 | vcpu->run->internal.data[1] = vcpu->arch.last_vmentry_cpu; | |
1464 | ||
1465 | return -EINVAL; | |
1466 | } | |
1467 | ||
1468 | static void pre_sev_es_run(struct vcpu_svm *svm) | |
1469 | { | |
1470 | if (!svm->ghcb) | |
1471 | return; | |
1472 | ||
d523ab6b TL |
1473 | trace_kvm_vmgexit_exit(svm->vcpu.vcpu_id, svm->ghcb); |
1474 | ||
291bd20d TL |
1475 | sev_es_sync_to_ghcb(svm); |
1476 | ||
1477 | kvm_vcpu_unmap(&svm->vcpu, &svm->ghcb_map, true); | |
1478 | svm->ghcb = NULL; | |
1479 | } | |
1480 | ||
eaf78265 JR |
1481 | void pre_sev_run(struct vcpu_svm *svm, int cpu) |
1482 | { | |
1483 | struct svm_cpu_data *sd = per_cpu(svm_data, cpu); | |
1484 | int asid = sev_get_asid(svm->vcpu.kvm); | |
1485 | ||
291bd20d TL |
1486 | /* Perform any SEV-ES pre-run actions */ |
1487 | pre_sev_es_run(svm); | |
1488 | ||
eaf78265 | 1489 | /* Assign the asid allocated with this SEV guest */ |
dee734a7 | 1490 | svm->asid = asid; |
eaf78265 JR |
1491 | |
1492 | /* | |
1493 | * Flush guest TLB: | |
1494 | * | |
1495 | * 1) when different VMCB for the same ASID is to be run on the same host CPU. | |
1496 | * 2) or this VMCB was executed on different host CPU in previous VMRUNs. | |
1497 | */ | |
1498 | if (sd->sev_vmcbs[asid] == svm->vmcb && | |
8a14fe4f | 1499 | svm->vcpu.arch.last_vmentry_cpu == cpu) |
eaf78265 JR |
1500 | return; |
1501 | ||
eaf78265 JR |
1502 | sd->sev_vmcbs[asid] = svm->vmcb; |
1503 | svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID; | |
06e7852c | 1504 | vmcb_mark_dirty(svm->vmcb, VMCB_ASID); |
eaf78265 | 1505 | } |
291bd20d | 1506 | |
d3694667 TL |
1507 | static void set_ghcb_msr_bits(struct vcpu_svm *svm, u64 value, u64 mask, |
1508 | unsigned int pos) | |
1509 | { | |
1510 | svm->vmcb->control.ghcb_gpa &= ~(mask << pos); | |
1511 | svm->vmcb->control.ghcb_gpa |= (value & mask) << pos; | |
1512 | } | |
1513 | ||
1514 | static u64 get_ghcb_msr_bits(struct vcpu_svm *svm, u64 mask, unsigned int pos) | |
1515 | { | |
1516 | return (svm->vmcb->control.ghcb_gpa >> pos) & mask; | |
1517 | } | |
1518 | ||
1edc1459 TL |
1519 | static void set_ghcb_msr(struct vcpu_svm *svm, u64 value) |
1520 | { | |
1521 | svm->vmcb->control.ghcb_gpa = value; | |
1522 | } | |
1523 | ||
291bd20d TL |
1524 | static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm) |
1525 | { | |
1edc1459 | 1526 | struct vmcb_control_area *control = &svm->vmcb->control; |
d3694667 | 1527 | struct kvm_vcpu *vcpu = &svm->vcpu; |
1edc1459 | 1528 | u64 ghcb_info; |
d3694667 | 1529 | int ret = 1; |
1edc1459 TL |
1530 | |
1531 | ghcb_info = control->ghcb_gpa & GHCB_MSR_INFO_MASK; | |
1532 | ||
1533 | switch (ghcb_info) { | |
1534 | case GHCB_MSR_SEV_INFO_REQ: | |
1535 | set_ghcb_msr(svm, GHCB_MSR_SEV_INFO(GHCB_VERSION_MAX, | |
1536 | GHCB_VERSION_MIN, | |
1537 | sev_enc_bit)); | |
1538 | break; | |
d3694667 TL |
1539 | case GHCB_MSR_CPUID_REQ: { |
1540 | u64 cpuid_fn, cpuid_reg, cpuid_value; | |
1541 | ||
1542 | cpuid_fn = get_ghcb_msr_bits(svm, | |
1543 | GHCB_MSR_CPUID_FUNC_MASK, | |
1544 | GHCB_MSR_CPUID_FUNC_POS); | |
1545 | ||
1546 | /* Initialize the registers needed by the CPUID intercept */ | |
1547 | vcpu->arch.regs[VCPU_REGS_RAX] = cpuid_fn; | |
1548 | vcpu->arch.regs[VCPU_REGS_RCX] = 0; | |
1549 | ||
1550 | ret = svm_invoke_exit_handler(svm, SVM_EXIT_CPUID); | |
1551 | if (!ret) { | |
1552 | ret = -EINVAL; | |
1553 | break; | |
1554 | } | |
1555 | ||
1556 | cpuid_reg = get_ghcb_msr_bits(svm, | |
1557 | GHCB_MSR_CPUID_REG_MASK, | |
1558 | GHCB_MSR_CPUID_REG_POS); | |
1559 | if (cpuid_reg == 0) | |
1560 | cpuid_value = vcpu->arch.regs[VCPU_REGS_RAX]; | |
1561 | else if (cpuid_reg == 1) | |
1562 | cpuid_value = vcpu->arch.regs[VCPU_REGS_RBX]; | |
1563 | else if (cpuid_reg == 2) | |
1564 | cpuid_value = vcpu->arch.regs[VCPU_REGS_RCX]; | |
1565 | else | |
1566 | cpuid_value = vcpu->arch.regs[VCPU_REGS_RDX]; | |
1567 | ||
1568 | set_ghcb_msr_bits(svm, cpuid_value, | |
1569 | GHCB_MSR_CPUID_VALUE_MASK, | |
1570 | GHCB_MSR_CPUID_VALUE_POS); | |
1571 | ||
1572 | set_ghcb_msr_bits(svm, GHCB_MSR_CPUID_RESP, | |
1573 | GHCB_MSR_INFO_MASK, | |
1574 | GHCB_MSR_INFO_POS); | |
1575 | break; | |
1576 | } | |
e1d71116 TL |
1577 | case GHCB_MSR_TERM_REQ: { |
1578 | u64 reason_set, reason_code; | |
1579 | ||
1580 | reason_set = get_ghcb_msr_bits(svm, | |
1581 | GHCB_MSR_TERM_REASON_SET_MASK, | |
1582 | GHCB_MSR_TERM_REASON_SET_POS); | |
1583 | reason_code = get_ghcb_msr_bits(svm, | |
1584 | GHCB_MSR_TERM_REASON_MASK, | |
1585 | GHCB_MSR_TERM_REASON_POS); | |
1586 | pr_info("SEV-ES guest requested termination: %#llx:%#llx\n", | |
1587 | reason_set, reason_code); | |
1588 | fallthrough; | |
1589 | } | |
1edc1459 | 1590 | default: |
d3694667 | 1591 | ret = -EINVAL; |
1edc1459 TL |
1592 | } |
1593 | ||
d3694667 | 1594 | return ret; |
291bd20d TL |
1595 | } |
1596 | ||
1597 | int sev_handle_vmgexit(struct vcpu_svm *svm) | |
1598 | { | |
1599 | struct vmcb_control_area *control = &svm->vmcb->control; | |
1600 | u64 ghcb_gpa, exit_code; | |
1601 | struct ghcb *ghcb; | |
1602 | int ret; | |
1603 | ||
1604 | /* Validate the GHCB */ | |
1605 | ghcb_gpa = control->ghcb_gpa; | |
1606 | if (ghcb_gpa & GHCB_MSR_INFO_MASK) | |
1607 | return sev_handle_vmgexit_msr_protocol(svm); | |
1608 | ||
1609 | if (!ghcb_gpa) { | |
1610 | vcpu_unimpl(&svm->vcpu, "vmgexit: GHCB gpa is not set\n"); | |
1611 | return -EINVAL; | |
1612 | } | |
1613 | ||
1614 | if (kvm_vcpu_map(&svm->vcpu, ghcb_gpa >> PAGE_SHIFT, &svm->ghcb_map)) { | |
1615 | /* Unable to map GHCB from guest */ | |
1616 | vcpu_unimpl(&svm->vcpu, "vmgexit: error mapping GHCB [%#llx] from guest\n", | |
1617 | ghcb_gpa); | |
1618 | return -EINVAL; | |
1619 | } | |
1620 | ||
1621 | svm->ghcb = svm->ghcb_map.hva; | |
1622 | ghcb = svm->ghcb_map.hva; | |
1623 | ||
d523ab6b TL |
1624 | trace_kvm_vmgexit_enter(svm->vcpu.vcpu_id, ghcb); |
1625 | ||
291bd20d TL |
1626 | exit_code = ghcb_get_sw_exit_code(ghcb); |
1627 | ||
1628 | ret = sev_es_validate_vmgexit(svm); | |
1629 | if (ret) | |
1630 | return ret; | |
1631 | ||
1632 | sev_es_sync_from_ghcb(svm); | |
1633 | ghcb_set_sw_exit_info_1(ghcb, 0); | |
1634 | ghcb_set_sw_exit_info_2(ghcb, 0); | |
1635 | ||
1636 | ret = -EINVAL; | |
1637 | switch (exit_code) { | |
1638 | case SVM_VMGEXIT_UNSUPPORTED_EVENT: | |
1639 | vcpu_unimpl(&svm->vcpu, | |
1640 | "vmgexit: unsupported event - exit_info_1=%#llx, exit_info_2=%#llx\n", | |
1641 | control->exit_info_1, control->exit_info_2); | |
1642 | break; | |
1643 | default: | |
1644 | ret = svm_invoke_exit_handler(svm, exit_code); | |
1645 | } | |
1646 | ||
1647 | return ret; | |
1648 | } |