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KVM: SEV: Use long-term pin when registering encrypted memory regions

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When registering an encrypted memory region for SEV-MEM/SEV-ES guests,
pin the pages with FOLL_TERM so that the pages are migrated out of
MIGRATE_CMA/ZONE_MOVABLE.  Failure to do so violates the CMA/MOVABLE
mechanisms and can result in fragmentation due to unmovable pages, e.g.
can make CMA allocations fail.

Signed-off-by: Ge Yang <yangge1116@126.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/1739241423-14326-1-git-send-email-yangge1116@126.com
[sean: massage changelog, make @flags an unsigned int]
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Ge Yang 2025-02-11 10:37:03 +08:00 committed by Sean Christopherson
parent a6136669da
commit 7e066cb9b7
1 changed files with 8 additions and 7 deletions
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15
arch/x86/kvm/svm/sev.c
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@ -619,7 +619,7 @@ static int sev_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr,
unsigned long ulen, unsigned long *n,
int write)
unsigned int flags)
{
struct kvm_sev_info *sev = to_kvm_sev_info(kvm);
unsigned long npages, size;
@ -660,7 +660,7 @@ static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr,
return ERR_PTR(-ENOMEM);
/* Pin the user virtual address. */
npinned = pin_user_pages_fast(uaddr, npages, write ? FOLL_WRITE : 0, pages);
npinned = pin_user_pages_fast(uaddr, npages, flags, pages);
if (npinned != npages) {
pr_err("SEV: Failure locking %lu pages.\n", npages);
ret = -ENOMEM;
@ -745,7 +745,7 @@ static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
vaddr_end = vaddr + size;
/* Lock the user memory. */
inpages = sev_pin_memory(kvm, vaddr, size, &npages, 1);
inpages = sev_pin_memory(kvm, vaddr, size, &npages, FOLL_WRITE);
if (IS_ERR(inpages))
return PTR_ERR(inpages);
@ -1240,7 +1240,7 @@ static int sev_dbg_crypt(struct kvm *kvm, struct kvm_sev_cmd *argp, bool dec)
if (IS_ERR(src_p))
return PTR_ERR(src_p);
dst_p = sev_pin_memory(kvm, dst_vaddr & PAGE_MASK, PAGE_SIZE, &n, 1);
dst_p = sev_pin_memory(kvm, dst_vaddr & PAGE_MASK, PAGE_SIZE, &n, FOLL_WRITE);
if (IS_ERR(dst_p)) {
sev_unpin_memory(kvm, src_p, n);
return PTR_ERR(dst_p);
@ -1305,7 +1305,7 @@ static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
if (copy_from_user(&params, u64_to_user_ptr(argp->data), sizeof(params)))
return -EFAULT;
pages = sev_pin_memory(kvm, params.guest_uaddr, params.guest_len, &n, 1);
pages = sev_pin_memory(kvm, params.guest_uaddr, params.guest_len, &n, FOLL_WRITE);
if (IS_ERR(pages))
return PTR_ERR(pages);
@ -1779,7 +1779,7 @@ static int sev_receive_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
/* Pin guest memory */
guest_page = sev_pin_memory(kvm, params.guest_uaddr & PAGE_MASK,
PAGE_SIZE, &n, 1);
PAGE_SIZE, &n, FOLL_WRITE);
if (IS_ERR(guest_page)) {
ret = PTR_ERR(guest_page);
goto e_free_trans;
@ -2675,7 +2675,8 @@ int sev_mem_enc_register_region(struct kvm *kvm,
return -ENOMEM;
mutex_lock(&kvm->lock);
region->pages = sev_pin_memory(kvm, range->addr, range->size, &region->npages, 1);
region->pages = sev_pin_memory(kvm, range->addr, range->size, &region->npages,
FOLL_WRITE | FOLL_LONGTERM);
if (IS_ERR(region->pages)) {
ret = PTR_ERR(region->pages);
mutex_unlock(&kvm->lock);