From nobody Sat Feb 7 12:19:24 2026 Received: from mail-pg1-f201.google.com (mail-pg1-f201.google.com [209.85.215.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D578234BA2E for ; Thu, 29 Jan 2026 17:27:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769707627; cv=none; b=jRBHkvCde6klrez6t409vKk0fT4mE9nSeAFP2VR6xd9jm+61dTrwwAgfdRPSJE45R2eaTQupW0Bfw2KfwGy4H54VAXOfgfVqxFoFzBXQ3BgDPbcCoP/etLwoFCMiUkEOXZpyzT/rKqqKVuA3sy4RIpIIL98kKmo7Da8rbqySu/8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769707627; c=relaxed/simple; bh=FwpWjHU7rvOvjW52eB25H6Qm6zwxtHHRB6+Xq0Gp2Ak=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=pUwon46wYJMoKc37P6kEtGZ+QUgfJ/CIUOl0KO2t/F9vbv46vb9qnGOVBWOesjygTLiYuV3pTXY3xYWx7gIDzwGJp8gb57VJhHMGzWSGtd0MzwBVUs4SM21J6hGwLS84s1t1AcDLb7ZTKUDZLmI9mL/vbLC19N3BvfdgbWrnTig= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--ackerleytng.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=CoXiSN2S; arc=none smtp.client-ip=209.85.215.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--ackerleytng.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="CoXiSN2S" Received: by mail-pg1-f201.google.com with SMTP id 41be03b00d2f7-c337cde7e40so739433a12.1 for ; Thu, 29 Jan 2026 09:27:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1769707625; x=1770312425; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=aleeEjsTJDUCWm7gOIfpdPrdkj/HH7o/8BjLvuLczLI=; b=CoXiSN2SUBxzFE9P7nimoJbvngJGmwfMvitIdaKqrTDmHewbjs3iF6Um+zS0fC1rt8 e/IdR6LPe+yCrr5b0SEHAJ/pcz6kJ6RzdNHLr74VJJRUpvgS6qyOiZBWP0kkAyr9mFiH pY7vmoL6fShg1xjODfALydS+4xaCefDNbRccNXOZDqbBwWMbwsyJjIxax0/iwhqqMXiD 3PLSUfx/C6cxJtX7/IRDsLYnHCYieDbD5uKAXBd4uGTQqW8bXYEk9sdQco8c5Q4Ai08p orjNgmp7VGnh2qhvsYm74v4nsA93J+Nz9lHS7+cMk9FT2514T69le+moo0zV2I9CQT+P nIEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769707625; x=1770312425; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=aleeEjsTJDUCWm7gOIfpdPrdkj/HH7o/8BjLvuLczLI=; b=cSToKlIqbunwBMror0P8dFBY/xW/GmYDjZiRmuTUsgUaQ9gpecJknkPTV5EDylUrvL VmpsgPVtWrX6V9tgX27sjGRHzcbt1BZXdBOWsVcrDvjWdUItQkHKN/ABB6SrsUWGyF1E S3+oMZHusKlfc7ECN1p3qzU9nm66MT4DyyXjJJD7+a6zuBqNpOKTiyPc9mUKatB/EfSf yKQvk1efnCsjflXsNikfWc4336qznoofiHeOPmOIxHElxb1URCKH/zScwovb1pvpeokT qoNGadiBVi+UYIzwM3vs4earHTHAhYHkClOYfqql2K3zqHrEmczC7rWOYs2KTXvRn382 i4cg== X-Forwarded-Encrypted: i=1; AJvYcCWCJJAKVQUkcKqUGYvOKcQbFc9dcKdIEG4GBq3QQLwSAKHzEhowu8ATG3QVIYjPy1qVYm9F7xsayXn1D70=@vger.kernel.org X-Gm-Message-State: AOJu0YwW2mq1JzKM/QI6RKeGZczny1qVpey9bj9/bHJ8pLZ2gfRga9Rj aBjeOB/+dvcQ5sWPdO3mBF9lQATJG2aLsQMsba70l+VSMbLtPucsl10S6oFKRzexxhKzYx3FnFD bSeGYpg7W/XEO3qfsMvrDdbMVDw== X-Received: from pjqs15.prod.google.com ([2002:a17:90a:ad8f:b0:352:cd45:8c42]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:270c:b0:34c:6108:bf32 with SMTP id 98e67ed59e1d1-3543b3f368dmr161480a91.34.1769707625170; Thu, 29 Jan 2026 09:27:05 -0800 (PST) Date: Thu, 29 Jan 2026 09:26:46 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.53.0.rc1.225.gd81095ad13-goog Message-ID: <20260129172646.2361462-1-ackerleytng@google.com> Subject: [PATCH] KVM: guest_memfd: Don't set FGP_ACCESSED when getting folios From: Ackerley Tng To: pbonzini@redhat.com, seanjc@google.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: david@kernel.org, vannapurve@kernel.org, Ackerley Tng , Vlastimil Babka Content-Transfer-Encoding: quoted-printable 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 [sean: split to separate patch] 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 fdaea3422c30..b3117f3359af 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -140,14 +140,13 @@ 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 =3D __filemap_get_folio(inode->i_mapping, index, - FGP_LOCK | FGP_ACCESSED, 0); + folio =3D filemap_lock_folio(inode->i_mapping, index); if (!IS_ERR(folio)) return folio; =20 policy =3D mpol_shared_policy_lookup(&GMEM_I(inode)->policy, index); folio =3D __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); =20 --=20 2.53.0.rc1.225.gd81095ad13-goog