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 0A6333FB7DD; Wed, 5 Aug 2026 09:31:26 +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=1785922290; cv=none; b=exS1nuKMppyrblyxCHaAepSbigLldY5LwXsDZc0P4GXjoYSh/WdNRVgtd7j9RuF3kotVAN1oZHlNrxcQ7DXrzO9Ogc5DjDirA4ySHLYt+/LC9Bg0GhPrvGZcP8c7uNkE/et55wnOsj/9xdBOrV+gcHGmM3ZnJSFBzxs8zIDozlg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785922290; c=relaxed/simple; bh=FVYv55IBEwcQrHQ6rs2iggdCKCYsB3hRc6patjAnlnY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=uemFjbD9qtGRlalxm0D7JL+4tng6U+9NhO/vHj9hFPFh2luq7DTGI3EscwJddU1KDvI5LJFRJWSIdgA9hMOMB9TXTEDTp+H5wQghAimLdTudnSCvfevAB6LA9SO9UmqRl7GehdxYb92gds5iLjcr5Hu0Gb1enKNNvIA40hS61qE= 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=jhXinj0C; 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="jhXinj0C" 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=HCP6mO+wKKfIvYSWgV3yoR0hiLYWZQCLwXNtJuiZRtM=; b=jhXinj0CchuihGOKOsi5MD6O4W u+At7TWxLwHWZ3B6/Gu53v8QbU8MF7wc6mubv18a/7llwgDbUTK4o2l9pTEoKzPZNxhTsp6IXYZW1 34UGn9+6hCOBNkXnyllVTAVvqzrbK+MenGznX5Z0AV05Ovwzahhsd6cWVADXSH0PVimAwVsMynMRO YxxdS+qtR/HRGBrYoZb9ggUG1LsPb5CWp4Iakz1AAyal6SuzahPza41YtGfgUOVcif/6dpbEAOvak 3B3cNx4fYOe2YP8o3Ys98BjnwUBBl1f72Q+qSLeDu4q7aLEvOBMBFnNSuJyNNxs6SSOuQnLvns6q3 Vo6/Hqmg==; Received: from [2a07:aa00:8c:e0:2ef0:7ea2:4f15:3280] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wrXtU-00000001ABs-2rNZ; Wed, 05 Aug 2026 09:26:38 +0000 Message-ID: <38e16d4386a5ca428366a55ffa83ab34e0e1b72a.camel@infradead.org> Subject: Re: [PATCH v7 31/36] KVM: x86: Add KVM_[GS]ET_CLOCK_GUEST for accurate KVM clock migration From: David Woodhouse To: Sean Christopherson Cc: Paolo Bonzini , Jonathan Corbet , Shuah Khan , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Vitaly Kuznetsov , Juergen Gross , Boris Ostrovsky , Paul Durrant , Jonathan Cameron , Sascha Bischoff , Marc Zyngier , Joey Gouly , Jack Allister , Dongli Zhang , joe.jin@oracle.com, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, linux-kselftest@vger.kernel.org Date: Wed, 05 Aug 2026 11:26:30 +0200 In-Reply-To: References: <20260728144954.355376-1-dwmw2@infradead.org> <20260728144954.355376-32-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-oAGZuj5i7ES/IfXkCZMt" 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 --=-oAGZuj5i7ES/IfXkCZMt Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2026-08-04 at 16:38 -0700, Sean Christopherson wrote: > On Sat, Aug 01, 2026, David Woodhouse wrote: > > On Fri, 2026-07-31 at 16:24 -0700, Sean Christopherson wrote: > > >=20 > > > > + /* > > > > + * Allow for a discrepancy of 1 kHz either way between the TSC > > > > + * frequency used to generate the user's pvclock and the current > > > > + * host's measured frequency, since they may not precisely match. > > > > + */ > > > > + if (user_tsc_hz < curr_tsc_hz - 1000 || > > > > + =C2=A0=C2=A0=C2=A0 user_tsc_hz > curr_tsc_hz + 1000) { > > >=20 > > > I don't follow, why is KVM restricting what frequency userspace can s= et? > >=20 > > Userspace actually sets the frequency with KVM_SET_TSC_KHZ. What KVM is > > insisting upon here is that the input to KVM_SET_CLOCK_GUEST is > > *consistent* with the guest's TSC frequency (within a little slop > > caused by different host TSCs). >=20 > Why does KVM care though?=C2=A0 I know some people hate that KVM's uAPI i= s permissive > to a fault, but trying to "help" userspace often ends badly for everyone.= =C2=A0 E.g. > what happens if userspace does KVM_SET_TSC_KHZ after KVM_SET_CLOCK_GUEST? The two operations have to be considered in isolation, at the time they happen. The KVM clock provides a y=3Dmx+c relationship from TSC (x) to kvmclock (y), where the rate (m) depends on the TSC frequency. The KVM_SET_CLOCK_GUEST function provides an equivalent y=3Dmx+c relationship, instructing the kernel to make them match. If the rates are the *same* then this is basically a case of adjusting the constant epoch (c) to make the two parallel lines coincide. If they *aren't* parallel, then what is KVM_SET_CLOCK_GUEST even asking for? I guess the kernel can adjust the guest's kvmclock so that it *intersects* the requested line at some point around now, but that really isn't what KVM_SET_CLOCK_GUEST exists for. --=-oAGZuj5i7ES/IfXkCZMt 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 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