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 456153ACA79; Thu, 13 Aug 2026 08:45:18 +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=1786610723; cv=none; b=DWvMrmYuOUxkEZ15faSl8OvbS6Q5XVHEG944db6dZgHzwzLS8GP4IoJXZ2GEasStT+xQT8CR19+UeFbBFHUHsdduXfL87fLigxWIE8zJUROJ8NNk9lGdM5KEHB4Z3mxHKe5ZwiJd43qZQJy32lD13ld+5M3chAxDBgqslNlYRi4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786610723; c=relaxed/simple; bh=Ed+wfizGP62pAzKr3t8wOQonDBOvqwOfp2hlHMGlkZI=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=hYCCohK+FEgHCcdUDw66684J1CWgtDitFQ0NM2HwNA7P5s9tv16aXwYAmE07AGpKbSgigpCqTMbcMMzK6tXX10Z1aBwK8HxXdHX7oIjaz0upzjIpcRbJmg+CJamcwyG2veym22BX3Lbwp28Is5wGw4abCEQpZWnWQt9VMCzekLY= 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=VpJzI+jq; 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="VpJzI+jq" 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=avnQtZManE1idvoUdPEQ7Vvjtfl50S261IhWnhrjKkY=; b=VpJzI+jqai9Vs4833VhnuCf/XA S5NcLnF+Y61SHbIs2NhaMGUm18oeDjUw4Oq400MV+UtcWmpp8FwxKWu/NJq7to631/8vUeSkQJa0D tvdZC1Z0rBYhuvXdnkYu5Mzw/QQMnAw0Bhsuqv18l0Es9IvsZdT93bbfGk0yQtGwIZc5p5X9QLFJ2 wfIH+FYviBBOfYNCVJC+KEgeZbjplYksK+szPlBiTzD/ar0nAATk6bwO/8hWBkx7TXAhuNT2cMNaD ICg9+SWeJC4xNjISoxacxjcGJjdyGKdYzhLJ5ain82ZsccQeMS8j1ko2/A6eneRI5D1qxbdSPTJfb NT9sgeLg==; Received: from [2001:8b0:10b:5:9e94:e235:608c:ebeb] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wuR3T-00000003Hlx-3NEH; Thu, 13 Aug 2026 08:44:51 +0000 Message-ID: <69b0cc5aa1032d708700bd2367b43d6238fc4079.camel@infradead.org> 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: Thu, 13 Aug 2026 09:44:43 +0100 In-Reply-To: References: <6ab49538675d97f1f4bf01574b1b066aae0bc05c.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-phlfi6ZPB3X+KU4yReB7" 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 --=-phlfi6ZPB3X+KU4yReB7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2026-08-11 at 11:41 -0700, Sean Christopherson wrote: > > > > And your variant just added a dependency on wallclock time back int= o it > > >=20 > > > Can you elaborate?=C2=A0 I'm guessing I don't entirely understand wha= t you mean by > > > wallclock time. > >=20 > > The system_time field? The unspecified might-be-UTC-might-have-leap-sec= onds one :) >=20 > Ok, I think I finally understand the goal.=C2=A0 I got turned around by t= he combination > of the name SET_CLOCK_GUEST and the full pvclock structure being passed t= o the > guest.=C2=A0 I was expecting SET_CLOCK_GUEST to literally set the entire = clock, e.g. > mul+shift, timestamp, etc. Apologies, I don't think I was paying enough attention; mostly my mind was in the GPC/RCU thing. The system_time field I picked out was actually the *guest* nanoseconds-since-boot, and there's nothing wrong with that per se. I was wrong to pick on that specifically. I think I still stand by my gut reaction, but it deserves a more coherent analysis... You had: struct kvm_pvclock { __u64 tsc_timestamp; // GUEST =E2=80=94 guest TSC cycles at sn= apshot __u64 tsc_scaling_ratio; // HOST =E2=80=94 guest cycles per *host= * cycle __u64 tsc_offset; // HOST =E2=80=94 guest TSC minus scaled= *host* TSC __u64 system_time; // GUEST =E2=80=94 guest kvmclock ns at s= napshot __u32 tsc_to_system_mul; // GUEST =E2=80=94 guest ns per guest cyc= le (with shift) __s8 tsc_shift; // GUEST =E2=80=94 ditto __u8 pad0; __u16 pad1; __u32 pad2; }; There are two kinds of fields in that =E2=80=94 the ones I've annotated as GUEST vs. HOST. This approach is conflating two things: Setting the guest TSC, and setting the guest's kvmclock. The guest part gives the y=3Dm(x=E2=88=92x=E2=80=B2)+c relationship of the = guest TSC to its kvmclock. It means exactly the same thing on any host, and it's precisely what Jack's KVM_[GS]ET_CLOCK_GUEST already passes. The other two fields are host-relative: guest-cycles-per-host-cycle, and guest-TSC-minus-scaled-host-TSC.=C2=A0You could use them to set the guest TSC (its offset *and* its rate)... but you don't. You just kind of assume this redundant information is true =E2=80=94 which it can't possi= bly be if this is a migration to a new host =E2=80=94 and trust what userspace provides in precisely the two places where Jack's code was using actual true data from a vCPU. It's better without the redundant information. We *know* how to set the guest TSC. We either restore the=C2=A0*offset* for a live update, or it's the *one* time we're ever allowed to use wallclock time, in the case of a live migration=C2=B9. That part lives nowhere near here. All we need is to express the relationship between guest TSC and the kvmclock. And that's precisely what the existing pvclock_vcpu_time_info ABI structure does. You are right that with the current implementation, the *precise* bitwise values of those fields might change (you can change the x' and the c in the equation and have the same line). That's because there's redundancy in the pvclock_vcpu_time_info structure already. If I understand correctly, that's where your concern about asymmetry between GET and SET comes from? I suppose we *could* make a new structure which doesn't have the redundancy, but it seemed better to use the existing ABI. (And has the added bonus that userspace can fish it out of the guest memory even when migrated from a kernel that didn't have this support. Yes, we've done that). And again, I don't *like* it when KVM refreshes masterclock and changes both the x' and the c in the equation... I *want* kvmclock to remain bit-constant for the whole *lifetime* of a guest, even the redundant parts. So I'd actually *prefer* our long-term userspace ABI to accommodate that and not eliminate the "redundancy". =C2=B9 (And with the stuff I've done on exposing the raw TSC values to=C2= =A0 userspace through PTP, even *migrations* can be done better by letting userspace calculate then set an offset). --=-phlfi6ZPB3X+KU4yReB7 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE AxMxRGlnaUNlcnQgQXNzdXJlZCBHMiBTTUlNRSBSU0E0MDk2IFNIQTM4NCAyMDI0IENBMTCCAiIw 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