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 0D4B13A8FE6; Mon, 10 Aug 2026 22:29:26 +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=1786400972; cv=none; b=HMJwrkj3Kc0I2k8sIsHWibLXjO9+p1S/ZkTu6jwm/WI3Ug4EnRbs3BpbMiAT0zE9D2rqOR+LiQ3txLDBNUBTwb+SNR26goquMxKEG69lAZf2NuyMKr8eem1e4q/tjX5GJo7Yo5KoaA5ae/ZXwHLn8E7hGSDMbo93+Pydm0RpbPo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786400972; c=relaxed/simple; bh=SijqBWl9ZkBNE7pHvkxqxYD5xyZpHt3QeS+w+ayHuQ0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=HCKqaRU+XLl0yA+efhSOK7e3UyqP98c88Vjr8n7HXSlUBXOA5INSpsvXkd4I56hmh1sfzQgYdVA1WFoeFydWR08ExJs711iVWvsHj+mURWyUXwzbMYW2cwXmSaw/+/dmgvysyKzHUXKkZ8K49oJrNMEfosm/QorbYP3XYNvWxBI= 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=pSAchZm5; 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="pSAchZm5" 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=SijqBWl9ZkBNE7pHvkxqxYD5xyZpHt3QeS+w+ayHuQ0=; b=pSAchZm53udG9aJjudbXeJ1VD9 GqwPYq5yU6gefz5TZ2w+NIZZLRqzE/ScTJi6ljnSSGssP69X7Y+M73EdEKX/7Z9u1BFDTYkB0ghea Yy06tKCJPPtyRC0HCIKvP0dhWERDAFl0I5Se6QKtJJdKqTRiWuRceZB/dzVvoP5roQAyIO40II86z o8zhhKe5GqttVYVFixb2tcAsgdKydF+t6xfg96nzfu8X039L2Ly/gFhIvqAaEKbivWwgWj1bks1tR CchsqFNYIuO7ytcqnNMYtySbGfyjLE3eMyEHXFJDdSrKDY/EsQQqjSQOI1oTYWC/RxJUXJuZ49qb1 jYqnTj6A==; Received: from [2001:8b0:10b:5:9f69:702f:982f:3898] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wtXBe-00000002RcN-2aLb; Mon, 10 Aug 2026 21:05:34 +0000 Message-ID: Subject: Re: [PATCH v7 17/36] KVM: x86: Allow KVM master clock mode when TSCs are offset from each other 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: Mon, 10 Aug 2026 22:05:00 +0100 In-Reply-To: References: <20260728144954.355376-1-dwmw2@infradead.org> <20260728144954.355376-18-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-zfkTkyTeIpo4gnwF+EUX" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: linux-doc@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 --=-zfkTkyTeIpo4gnwF+EUX Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2026-08-10 at 13:56 -0700, Sean Christopherson wrote: > =C2=A0 > > > To allow different offsets, KVM would need to track a per-vCPU offset= to the > > > master clock and apply that in kvm_guest_time_update() (and maybe oth= er places?). > > > Which is doable, but it's not clear to me why we'd want to support th= at (though > > > I haven't fully processed the back half ot his series, so it's very p= ossible I'm > > > missing something obvious). > >=20 > > Because I want to reduce the number of cases where we have to fall back > > to non-masterclock mode. Especially the ones which are driven by > > *guests* rather than weird choices on the VMM's part. >=20 > But why though?=C2=A0 What is the harm to the host or guest?=C2=A0 E.g. d= oes it make it more > difficult to accurately migrate the VM?=C2=A0 I'm not opposed to allowing= master-clock > mode with diverging offsets, just trying to understand why it matters. Accurate migration without masterclock is hard, yes. The KVM_SET_CLOCK_GUEST thing relies on it (because the principle is that you get the *TSC* right, then the KVM clock is just a fixed mathematical function of that). That *shouldn't* be difficult with offsets between vCPUs. Just use the TSC of vCPU0 as the reference for KVM_SET_CLOCK_GUEST and let the others just have their offset from that. I'll take another look. --=-zfkTkyTeIpo4gnwF+EUX 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 Z/Hwc0Sn9Gz8RmGRK6Ka4hVDl8q/2l110KaV233Kh5etP0csXS8MIMdVRfRu3sc5hp13DG7lCKzK 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