[RFC PATCH v1 08/37] KVM: guest_memfd: Don't set FGP_ACCESSED when getting folios
From: Ackerley Tng
Date: Fri Oct 17 2025 - 16:16:14 EST
guest_memfd folios don't care about accessed flags since the memory is
unevictable and there is no storage to write back to, hence, cleanup the
allocation path by not setting FGP_ACCESSED.
Signed-off-by: Ackerley Tng <ackerleytng@xxxxxxxxxx>
[sean: split to separate patch, write changelog]
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
virt/kvm/guest_memfd.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c
index 855e682041311..2a9e9220a48aa 100644
--- a/virt/kvm/guest_memfd.c
+++ b/virt/kvm/guest_memfd.c
@@ -167,14 +167,13 @@ static struct folio *kvm_gmem_get_folio(struct inode *inode, pgoff_t index)
* Fast-path: See if folio is already present in mapping to avoid
* policy_lookup.
*/
- folio = __filemap_get_folio(inode->i_mapping, index,
- FGP_LOCK | FGP_ACCESSED, 0);
+ folio = filemap_lock_folio(inode->i_mapping, index);
if (!IS_ERR(folio))
return folio;
policy = kvm_gmem_get_folio_policy(GMEM_I(inode), index);
folio = __filemap_get_folio_mpol(inode->i_mapping, index,
- FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
+ FGP_LOCK | FGP_CREAT,
mapping_gfp_mask(inode->i_mapping), policy);
mpol_cond_put(policy);
--
2.51.0.858.gf9c4a03a3a-goog