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 E4BD23314D9; Tue, 12 May 2026 05:22:03 +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=1778563329; cv=none; b=Gr0DDAl9Qsy/jWslJDC2/aoh3LDhXVgtAoNFRHTUkY5U/DIznOgVIg3Y1rjizW1CIH8fTpus7MUb2ncrp6ftO+6Rr9VgWfWqCOA52u/vF74dU2rkIwz4dClHshjl+px65rcxFt0N46P8hf/cVSJDi43Jswy61OgGgSUA5XIYkvE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778563329; c=relaxed/simple; bh=8Ydtit5BWBcDIEW78DgjpNtuyZBU9y/zrplqNnO5jAg=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Z/IDSeAR6ZHJnQc3MqltCrnSEvWXObQW4W63N6LXcptYw6gNFqYoKwfpV8zKSjqfaFExSt3usxeQJ/YtP4m0290muPc+lIVHh2g63/hKMnJR/GLZgRGxhXB91RuQ7AUUyLNzK9tXsN/RSw6DA40JcfV8tEQ0rqk2hhDegxtfShg= 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=Tk9J1Q3h; 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="Tk9J1Q3h" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=8Ydtit5BWBcDIEW78DgjpNtuyZBU9y/zrplqNnO5jAg=; b=Tk9J1Q3hwYqy2eq2g4GMCiTD/1 OCl5lqn6Adx4JOQfsRwwk3HxzDX3R/ftcxOm+rVM983/cJpr/nxu/IjgC8+busL+FvMo4q+1uZXof Ug9x5NDu4XTHxGFAvXQShmF1UwY+f9/Jwi2XsuRALiA5+UsgXEf/gjSPE9lRWfCiB5ThmTEka/Uq2 x3wfxcbCE6aSfjjLnHO55cY2NWP7ctgkY62yFljzCtiX0MXivM/aFBuJE9BElg4zS03uJ1Go5raBO YVpla/9o8M8MRQlgHxYDHL38wPLS/eEx/OIcaVs4MpkbfXA5myPTqti7yjGOPYiZjSss+5tSFhRww olzoewsg==; Received: from 54-240-197-236.amazon.com ([54.240.197.236] helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMfZ9-00000009CJb-0wB9; Tue, 12 May 2026 05:21:59 +0000 Message-ID: <94bbb27100ac85508f00234e4ffdb619de855d7c.camel@infradead.org> Subject: Re: [PATCH 3/3] KVM: x86: conditionally update masterclock data in pvclock_update_vm_gtod_copy() From: David Woodhouse To: Dongli Zhang , kvm@vger.kernel.org Cc: seanjc@google.com, pbonzini@redhat.com, paul@xen.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, joe.jin@oracle.com Date: Tue, 12 May 2026 06:21:58 +0100 In-Reply-To: References: <20260115202256.119820-1-dongli.zhang@oracle.com> <20260115202256.119820-4-dongli.zhang@oracle.com> <16b69905d5d14a06dbb68f29355c58e2c7d2f0d2.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-W4eKE2T4X4hWQ/rqAiFG" User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: kvm@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 --=-W4eKE2T4X4hWQ/rqAiFG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2026-05-11 at 17:16 -0700, Dongli Zhang wrote: >=20 >=20 > On 5/9/26 5:22 AM, David Woodhouse wrote: > > On Thu, 2026-01-15 at 12:22 -0800, Dongli Zhang wrote: > > > The pvclock_update_vm_gtod_copy() function always unconditionally upd= ates > > > ka->master_kernel_ns and ka->master_cycle_now whenever a > > > KVM_REQ_MASTERCLOCK_UPDATE occurs. Unfortunately, each masterclock up= date > > > increases the risk of kvm-clock drift. > > >=20 > > > If pvclock_update_vm_gtod_copy() is not called from > > > vcpu_enter_guest()-->kvm_update_masterclock(), we keep the existing > > > workflow. The argument 'forced' is introduced to tell where it is fro= m. > > >=20 > > > Otherwise, we avoid updating the masterclock if it is already > > > active and will remain active. In such cases, updating the mastercloc= k > > > data is not beneficial and can instead lead to kvm-clock drift. > > >=20 > > > As a result, this patch minimizes the chance of unnecessary masterclo= ck > > > data updates to avoid kvm-clock drift. > > >=20 > > > Cc: David Woodhouse > > > Signed-off-by: Dongli Zhang > >=20 > > Hmm... so the only caller of pvclock_update_vm_gtod_copy() that doesn't > > set the 'force' argument is the one in kvm_update_masterclock(), so we > > are asserting that kvm_update_masterclock() never needs to *change* the > > masterclock origin point, if it was already set? > >=20 > > The gtod notifier callback in pvclock_gtod_update_fn() also ends up > > setting KVM_REQ_MASTERCLOCK_UPDATE, and is triggered by an actual host > > timekeeping update (which could potentially be from a clocksource > > change). It also hypothetically possible that the clocksource changes > > from TSC =E2=86=92 HPET =E2=86=92 TSC, switching back to TSC again befo= re the > > masterclock update ever gets to run. Or maybe a suspend/resume? > >=20 > > Are you *sure* that the optimisation is always valid...? >=20 > Thank you very much! >=20 > I didn't validate the scenario you mentioned. I missed that scenario beca= use I > assumed that most production systems nowadays use STABLE/CONSTANT/NONSTOP= TSC as > the host clocksource, although I sometimes forgot to add "clocksource=3Dt= sc > tsc=3Dreliable" to my AMD L1 KVM guest (acting as the hypervisor for L2 g= uest). I'd love to assume that, but we do still have to cater for systems without it (or where it goes wrong). And where userspace sets up vCPUs with different frequencies... although I'd quite like to ban that too :) > I didn't follow up on this patch because I noticed another issue. I found= that > the tsc_timestamp in the PVTI can become a very large number if we simply= reboot > the guest VM. This happens because the patch stops updating the masterclo= ck data > when the masterclock is already active and remains active. >=20 > For example: >=20 > current guest TSC: 122763682 > PVTI->tsc_timestamp =3D 18446744073656540006 > PVTI->system_time=3D196515164269 >=20 > Although I could not reproduce any bug, that still made me feel uncomfort= able. That's just negative (-53011610). Theoretically it's OK; it's just a consequence of using a reference point in the past. Probably just *asking* for guest bugs though, so best avoided. I'd like to understand how it got like that though. Did your 'reboot' reset the guest TSC to zero but *not* its kvmclock? --=-W4eKE2T4X4hWQ/rqAiFG Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 aDJAwtycb8yXtILj+TvfhLFhafxroXrflspavejQkEiHjNjtHnwbZ+o43g0/yxjwnarGI3kgcak7 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