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AJvYcCVnWr1cX4q+fbxd8jIh39DsaRJExlmTJS+Wl+2j02J40FgJm0gqRFpw+FLew1ipGotQ3erd72RAqvQq7FI=@vger.kernel.org X-Gm-Message-State: AOJu0Yxyej2ydzecmlslqre+cBj0K5Z/cjnHCUMNiS7NkZIUiPQ9lIjV n1FfD6NdJiKSNV1tZpd9rAURNxv3uj3ipg7jJJ+JRqHXeAUIAKCIcjQdDO3Xv8caDcs3yKtuPIq dOFLU1PokYZ8c3ISGcryWDAvg2Q== X-Received: from pjup4.prod.google.com ([2002:a17:90a:d304:b0:34c:2778:11c5]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:3d46:b0:354:ad98:7d1c with SMTP id 98e67ed59e1d1-358ae7fd556mr7480246a91.11.1771830291734; Sun, 22 Feb 2026 23:04:51 -0800 (PST) Date: Mon, 23 Feb 2026 07:04:34 +0000 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.53.0.345.g96ddfc5eaa-goog Message-ID: <108d4e27b72480a20e4490d839acadd0b0a2dcea.1771826352.git.ackerleytng@google.com> Subject: [RFC PATCH v1 01/10] KVM: guest_memfd: Don't set FGP_ACCESSED when getting folios From: Ackerley Tng To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: akpm@linux-foundation.org, david@kernel.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, willy@infradead.org, pbonzini@redhat.com, shuah@kernel.org, ackerleytng@google.com, seanjc@google.com, shivankg@amd.com, rick.p.edgecombe@intel.com, yan.y.zhao@intel.com, rientjes@google.com, fvdl@google.com, jthoughton@google.com, vannapurve@google.com, pratyush@kernel.org, pasha.tatashin@soleen.com, kalyazin@amazon.com, tabba@google.com, michael.roth@amd.com Content-Type: text/plain; charset="UTF-8" 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 Signed-off-by: Sean Christopherson Acked-by: Vlastimil Babka Acked-by: David Hildenbrand (arm) --- 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 923c51a3a5256..2df27b6443115 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -126,14 +126,13 @@ 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 = mpol_shared_policy_lookup(&GMEM_I(inode)->policy, 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); -- 2.53.0.345.g96ddfc5eaa-goog