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 0CB1A35F5E3; Fri, 28 Aug 2026 22:46:30 +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=1787957196; cv=none; b=OK1+5XbnDvvtfd8MF6DWje5kjTIArBG7DJu8cucmeSnm9OnBRjluQDhtkEA9aBHTyg3iG+gRDuUzTGghGbPT8BcQdWbi22rG4S2sQkph3BmgIRjKqsNgEUnETM/VWuZCbD1d4MVt4pziAnau2SY5I88cgpYNFSJA/FnS+DaYqy8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787957196; c=relaxed/simple; bh=odn1maz74Tf3364rF+bSGSiPNNbBwqyUZxob5O/EdhA=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:Content-Type: MIME-Version; b=k0oM0KXjfgJCy2+vHs8kNRKWC1rTwyW5eDBXLoh3YyKoWl0NmnHEEVZqWdkpD+bgBAApxrmgOXznqgMKTZp22Ts/dUVsIodot0OK9glM3baTlKgv+Aw9cd7MYqalRI2HS5ap4ICQya2OOFN6S4zR++j8ikTgX1D4JGqTefVTeb8= 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=u3qGujmu; 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="u3qGujmu" 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=odn1maz74Tf3364rF+bSGSiPNNbBwqyUZxob5O/EdhA=; b=u3qGujmusEKg+kyBQzubKpXQia m9gheGlQvBXGOVDA1gWWO4Cxc9P+I686U10slEyqrZu51uaJGQT4uo3F1PY0PAG3SqSuqrFooGnLb 0bXZ/V4WL9h85HPVclREHZh07mUAw3U9pJwjWA/y7tgU2zXyrD19hMk7o70f+tGoPMQlHyI3kTeRF 0wHhhaLdiWE+JcOUqPtVRIqoVOG4HuEuRAS6bB8nsAYir3GEOeqBWHe6c9rnrhKSieJR6LvMm5rzr SuKsGgFd6S76xsZewxdfiTAtvHyl+9DFBc/Mxy1z98qp7kcX8UHUjJ54oc5rtK/bBd5a79nCLkRAO kpwEkpBg==; Received: from [2001:8b0:10b:5:d89b:13dc:754b:b035] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1x05L1-0000000FYCE-3Ozv; Fri, 28 Aug 2026 22:46:20 +0000 Message-ID: <7eedeed241687f3b5f5953bf6717afd2bf5a58d2.camel@infradead.org> Subject: Re: [PATCH v10 21/21] KVM: x86: Use kernel timekeeping snapshot to get walltime+TSC From: David Woodhouse To: seanjc@google.com, pbonzini@redhat.com, Thomas Gleixner Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, paul@xen.org, dongli.zhang@oracle.com, sashiko-reviews@lists.linux.dev Date: Fri, 28 Aug 2026 23:46:06 +0100 In-Reply-To: <20260826214952.129BB1F000E9@smtp.kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-pYmk+KPZFKVZeByj8FKB" 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 --=-pYmk+KPZFKVZeByj8FKB Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2026-08-26 at 21:49 +0000, sashiko-bot@kernel.org wrote: > [Severity: High] > Does removing KVM's local TSC clamping expose guests to mismatched time p= airs? >=20 > When establishing the guest's PV clock, KVM provides a master clock > snapshot pairing a host TSC with a system time. The previous read_tsc() > logic explicitly clamped the TSC to cycle_last to maintain mathematical > consistency. I think this is basically the same class of issue I brought up in https://lore.kernel.org/all/87v7beb7s3.ffs@fw13/ and Thomas said the right thing is just to ignore it? If the discrepancy was more than a few cycles, we shouldn't be in masterclock mode anyway, should we? --=-pYmk+KPZFKVZeByj8FKB Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE AxMxRGlnaUNlcnQgQXNzdXJlZCBHMiBTTUlNRSBSU0E0MDk2IFNIQTM4NCAyMDI0IENBMTCCAiIw DQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAOfSIeC0vv1xPQ+dgSxbIIrkaru6skAWJYaGFzmv q4Kq+2wU2jxhcWlJg/JeP5jEkq/LM3pn5aaLao79j+XRmS7J1ZpJKUODJVoM4s9MQJhTMvo4qS5Z S64g6QR7Obkz3I1Lr3aWeSBmDDEyzue+NKtuWZ1Cxy3RdXo/w5HgRc3l2AercOM3Gt1XonTzEtTb 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