From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E3815233928; Mon, 3 Aug 2026 15:38:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785771504; cv=none; b=Q89fFzSU0+WuQaq+YrR2AvDgbzuJdg12j937DGk+tq9dAiuWIFci73J9oAJGHxaAkPWWXDzG/sEKt9kLaKqP90qPdlsDZ875C6f+g96+g6voeKnJo0SyppSHAqPQH2+gzLXEED4sAcYCJPUU4D2a6s7HPEmKf/kEDySZyACRcVs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785771504; c=relaxed/simple; bh=8ISYDSmxkOpKseR+yBR5EehoUQc5jraXE0v0duqNcBw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:Content-Type: MIME-Version; b=RXa4bpIMSfTn3ZVA60SEvTV9jZCuPd8VlH6YZkuTCtrjW3MqDUWC2Bi9QnnXbs+w9Ca8sieqPzRNDntEkftkhqmsiCASUt8ZkOVEh4AHN/EXoTOhcxA3c0AW6hx1rbGMqWRkDteT6nE+k0asaLf5GALiycakhKw6pwDJQnP7lok= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=WlAGQgp0; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="WlAGQgp0" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:In-Reply-To: Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:References; bh=HsBzxpRYCCevruFrR8/Z+e49Shxrf/Z7La+ei9x8b7s=; b=WlAGQgp0gYkBgNKwuAcdYwsOlR 7Ypz9HFzaunTMR7WwsTFRPJHIfiKeu+Fr7OwFrp9kaeBxGYXOsx7O4dr1Mbj9tTitc4EV7JfEXcgr /i+qfdmJx+6UJBgNnZh9n9D0bPSIFj8b2BfGFG8OjkLIukRMGmfL1UHPGOEpNRIpbJSk21PjcYq88 NWcZWLXQmDIsG1lM/ZBEItJ6TYbSZWHK2ufdAsEXsuz5yVeLmTlQD0mZM0mj3409Q25J5i0rx74NN KAmYEwcBo7drYnWNtMtBlyGH2l/kri9FnV1RBMi2Ovx/tZWhjcU8UQFvRl3xEb9hcMv3uCpvsaFGR g3x/JN/w==; Received: from [2a07:aa00:8c:e0:23e6:b82d:465f:e745] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wquk4-0000000Dup5-02Bi; Mon, 03 Aug 2026 15:38:16 +0000 Message-ID: <992c01aa0167a95181bc59401a3cd991906e9d60.camel@infradead.org> Subject: Re: [PATCH] KVM: pfncache: track HVA invalidations for HVA-based caches From: David Woodhouse To: Sean Christopherson Cc: Jeongjun Park , Paolo Bonzini , Paul Durrant , Heitor Alves de Siqueira , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+0948c82180d475ad24e2@syzkaller.appspotmail.com, syzbot+fb7c2dd166d3ea63df2a@syzkaller.appspotmail.com Date: Mon, 03 Aug 2026 17:38:15 +0200 In-Reply-To: Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-G/XKKEeGHCZlgwi2LlDN" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-G/XKKEeGHCZlgwi2LlDN Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable (Spent the day prodding at AI on this while I'm in meetings; I've let it draft the below for me which isn't entirely my voice but I'm mostly OK with it...) On Mon, 2026-07-27 at 10:25 -0700, Sean Christopherson wrote: > Can you provide the reproducer? That would be super helpful for reviewin= g and > iterating on this fix, and probably as a regression test for future chang= es as > well. There's one at https://david.woodhou.se/xen_shinfo_race.c now =E2=80=94 no memslots, just five processes racing KVM_XEN_HVM_SET_ATTR(SHARED_INFO_HVA) against MAP_FIXED shmem remaps over the cached HVA. It fires the syzbot splat within five seconds in a QEMU guest running an unfixed kernel. Tracing confirms the diagnosis: complete invalidations (start *and* end) land entirely within the window where hva_to_pfn_retry() has dropped gpc->lock for the GUP, so by the time it re-checks, mn_active_invalidate_count is back to zero and mmu_invalidate_seq never moved because nothing overlapped a memslot. (Note syzbot also found its own reproducer last week=C2=B9.) The same bug is also reachable through the vcpu_info cache, where the stale mapping is then dereferenced by kvm_setup_guest_pvclock() on the next KVM_RUN =E2=80=94 which is syzbot+fb7c2dd166d3ea63df2a, the one Heitor posted a sibling-GPC workaround for=C2=B2. Reproducer for that variant: https://david.woodhou.se/vcpu_info_race.c Since you said you'd want to land the sequence fix together with the range-based optimization: I've taken a shot at that. The branch at https://git.infradead.org/?p=3Dusers/dwmw2/linux.git;a=3Dshortlog;h=3Dref= s/heads/pfncache-fixes has your gpc_invalidate_seq patch (with the sampling side in hva_to_pfn_retry() also switched over, and both syzbot tags; Cc: stable and deliberately minimal for backporting) followed by your Oct 2024 patches=C2=B3 rebased on top, with the range check's second arm now checking gpc_invalidate_seq so it catches invalidations which complete within the refresh window without touching a memslot. I've dropped the sleep-based wait for now. David Woodhouse (2): KVM: pfncache: use a dedicated invalidation sequence for cache refres= h KVM: pfncache: Implement range-based invalidation check for hva_to_pf= n_retry() Sean Christopherson (3): KVM: pfncache: Snapshot invalidation sequence immediately before hva_= to_pfn() KVM: pfncache: Wait for in-progress invalidations to complete during = refresh KVM: pfncache: Add lockless checking of cache invalidation events include/linux/kvm_host.h | 4 ++ virt/kvm/kvm_main.c | 17 +++++- virt/kvm/pfncache.c | 144 +++++++++++++++++++++++++++++++------------= ---- 3 files changed, 114 insertions(+), 51 deletions(-) Both reproducers fire in seconds on the unfixed base and survive ten-minute soaks under KASAN+lockdep with the first patch alone and with the full series. On the RT concern with taking mn_invalidate_lock across the GPC walk: I don't think the "sleeping while atomic" problem exists once the GPC locks are no longer irqsave, which v2 of the rwlock_t series=E2=81=B4 alrea= dy does. =C2=B9 https://lore.kernel.org/all/6a6f68af.13bfb6d0.1ecdd5.0271.GAE@google= .com/ =C2=B2 https://lore.kernel.org/all/20260723-kvm_guest_pvclock-v1-1-bba3ea77= 419b@igalia.com/ =C2=B3 https://lore.kernel.org/all/Zw8DINUkJJKDByXE@google.com/ =E2=81=B4 https://lore.kernel.org/all/20260529165114.748639-6-seanjc@google= .com/ --=-G/XKKEeGHCZlgwi2LlDN Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi 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