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 02B983905E3; Tue, 11 Aug 2026 15:05:25 +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=1786460728; cv=none; b=Vh7JJz0m3p1KdGJ/CwaUKoiIMFKb3Wg7j708Yk1ZxALpEDN1P+H7SkNF7CEdmVzTiRQ8u5u+Dgcvr4oVgNRhRcsR+R/QvCWUsZAklael8DuFZMYjGDIU8YQN/M1Y42IUGk2iTCHITUqdUhwQkWp5E2RkP63JvFddk3ANfnqToPs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786460728; c=relaxed/simple; bh=qAuyY5O97Y4wSCxhgnCQ6DdUJ63ACOE+3pED0Oqb5QY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=elMTgFmURY9E93SeTRC7BMafRl/fyWBRfp7Biv5PbLDCT3BDftiu13PBvp6IcQhLtfJ07vE4f1lqOXwftFapRnkAnIk9uIJPffj6Yv7x4qocX5IvRZ5O9rx+9mEi9e5sz5elPlCQ8V8dXodoM8PWyWeSYNH4h97FaIsy3qQPbEk= 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=oVq/9ftD; 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="oVq/9ftD" 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=C6rkUIL+dM1UFpFpZSm+dPCwsMFKdFomwHvt9iy8cEo=; b=oVq/9ftDEOCy0zT21RIRhInWyA xTR9PHbbOmnMF5nK1StXUz7O6WRpcslQPreuEUiQYa1xoJBjIMfSXBEn5zw7slp8C2icWp9oJcoUT 3S5wy5GI3r+1zGmQjWyCPh/EpD5Oz3ueAuyNDLD/bMrNuXDjK+exsf+WUkQNvMGO8ZjWJSvk9n6xo OYRlQ7sHKvNVlu5Vud/NojZJibnz1tL6iby4p0WvwWSSxjx+d4emimsCM57wG1R4cK3BU+xcQY0WZ CFWq4sB44UaATIUOZYxJk7m54tmLacdFSZ4aEUikXWc1CDYehcGC6QBoWNQ7Rw2yRPLcfzYf7/99C IVStKiMg==; Received: from 54-240-197-227.amazon.com ([54.240.197.227] helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wto2P-00000000avv-0iNZ; Tue, 11 Aug 2026 15:05:09 +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: Tue, 11 Aug 2026 16:05:03 +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="=-F6kD8Qx0GpTaOeFjxO+8" 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 --=-F6kD8Qx0GpTaOeFjxO+8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2026-08-11 at 07:33 -0700, Sean Christopherson wrote: >=20 > Actually, why are KVM_{G,S}ET_CLOCK_GUEST vCPU-scoped?=C2=A0 Per the docu= mentation, > the API "Sets the KVM clock (for the whole VM) in terms of the vCPU TSC".= =C2=A0 If > the APIs are VM-scoped instead of vCPU-scoped, then KVM can simply save/r= estore > what's in the per-VM masterclock state, no? They're vCPU-scoped because they need to be tied to a guest TSC (on live migration, neither ka->master_cycle_now nor ka->master_kernel_ns are useful =E2=80=94 those are the "per-VM masterclock state"). Theoretically, guest TSCs can be different on each vCPU (different offset, different *rate* even. Not that we allow KVM_[GS]ET_CLOCK_GUEST at different rates, I concede). So they operate in the context of a given vCPU, and *its* TSC. And I think I'm going to defend that 'theoretical they can be different', because I *would* like to eliminate the ways that a *guest* can force non-masterclock mode, and that does mean allowing the offset- TSC case. FWIW in my local tree I've just extended the pvclock_migration_test to test precisely the thing you were concerned about: three vCPUs with divergent TSC offsets, migrated by setting each vCPU's TSC and then invoking KVM_SET_CLOCK_GUEST once, through vCPU0. Masterclock stays active, TSC_STABLE_BIT is correctly clear, and all three vCPUs' pvclocks (and KVM_GET_CLOCK) agree to within a nanosecond afterwards. I'll include that in the next spin. > That would also help address my concerns about sanity checking the TSC fr= equency > against the kvmclock frequency, as the APIs are much more blatantly about= saving > and restoring masterclock state.=C2=A0 For whatever reason, it feels more= natural for > me to say that KVM_SET_CLOCK_GUEST will fail if the target frequency does= n't > (fuzzily?) match the frequency at which the masterclock is already config= ured. > Probably because use_master_clock directly gates that information?=C2=A0 = Whereas the > vCPU's frequency is independently configured but obviously influences mas= terclock > mode. I am perfectly happy to say that the *existing* check as I have coded it, is matching against the frequency at which the masterclock is configured. Because we can't *get* there if the guest is not in masterclock mode, and it can't be in masterclock mode unless all its vCPUs are running at the same rate, which *is* the master clock rate. :) I guess I could even concede to change the actual code rather than just the comment... (untested) Still needs the *offset* of the vCPU though. --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3595,15 +3595,15 @@ static int kvm_vcpu_ioctl_set_clock_guest(struct kv= m_vcpu *v, void __user *argp if (kvm_caps.has_tsc_control) curr_tsc_hz =3D kvm_scale_tsc(curr_tsc_hz, - v->arch.l1_tsc_scaling_ratio); + ka->master_tsc_scaling_ratio); /* * The mul/shift in the provided pvclock structure encode the guest * TSC frequency at which it was generated. Sanity-check that it is - * consistent with this vCPU's effective TSC frequency, allowing a - * discrepancy of 1 kHz either way since independently calibrated - * hosts will not measure precisely the same value even for the - * same nominal frequency. + * consistent with the frequency at which the masterclock is + * configured, allowing a discrepancy of 1 kHz either way since + * independently calibrated hosts will not measure precisely the + * same value even for the same nominal frequency. */ if (user_tsc_hz < curr_tsc_hz - 1000 || user_tsc_hz > curr_tsc_hz + 1000) { --=-F6kD8Qx0GpTaOeFjxO+8 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi 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