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KVM: SEV: Mark source page dirty when writing back CPUID data on failure

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When writing back CPUID data (provided by trusted firmware) to the source
page on failure, mark the page/folio as dirty so that the data isn't lost
in the unlikely scenario the page is reclaimed before its read by
userspace.

Fixes: 2a62345b30 ("KVM: guest_memfd: GUP source pages prior to populating guest memory")
Signed-off-by: Ackerley Tng <ackerleytng@google.com>
Link: https://patch.msgid.link/20260522-fix-sev-gmem-post-populate-v2-5-3f196bfad5a1@google.com
[sean: use set_page_dirty(), massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Ackerley Tng
2026-05-22 15:46:10 -07:00
committed by Sean Christopherson
parent 138f5f9cbe
commit 97cd21d57e
1 changed files with 1 additions and 0 deletions
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arch/x86/kvm/svm/sev.c
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@@ -2382,6 +2382,7 @@ static int sev_gmem_post_populate(struct kvm *kvm, gfn_t gfn, kvm_pfn_t pfn,
void *dst_vaddr = kmap_local_pfn(pfn);
memcpy(src_vaddr, dst_vaddr, PAGE_SIZE);
set_page_dirty(src_page);
kunmap_local(dst_vaddr);
kunmap_local(src_vaddr);