KVM: SEV: Drop page refcount early in VMSA reload

When reloading the guest VMSA for an SEV-SNP vCPU, KVM retrieves the PFN
from guest_memfd.

Drop the page reference immediately after retrieving the PFN instead of
holding it across MMU lock acquisition in preparation for a follow-up patch
to stop returning page pointers from guest_memfd PFN lookups.

This is safe because the page's validity and presence are governed by KVM's
MMU invalidation protocol rather than the page reference.

No functional change intended.

Reviewed-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Ackerley Tng <ackerleytng@google.com>
Link: https://patch.msgid.link/20260826-gmem-no-return-page-v4-4-3bb9c1ddb4e3@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

0 files changed, 0 insertions, 0 deletions