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 B75D43BED4F; Thu, 10 Sep 2026 18:37:09 +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=1789065434; cv=none; b=AKArzZ0jb+NiDIFEw3RVh0v9O8d7xRIW8Go4KAICP7Y39gQfyzHYu7GTOK/kYiDPn8B2VtG6iyvIFAmgzVMjan1eCbYN8IH77Z04gmzcNlUUEJTsvZGOHkl+NpTGkFTaOzZ9EJryolDzmkKDlguebJU9dGcpASAF82oQpeOGzOs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789065434; c=relaxed/simple; bh=wOS95Ra8vpgZqPPtuGigA2/jRdxnP7FegxOh9WR7HSk=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References: Content-Type:MIME-Version; b=DqYz2xPO+u09YYc86UdXpb8JP7obu0xbVg4lebSY1QaIfQHM5WNxRa5nxzkYBJtUBBCvS9UKZ8nw/F+9n3a7wRwBoCOc+e75ZK64lvnkZyrwlwLj4wKKWnJQl4mgdD7Wx8blN3qjTTkPfjv2Tqx/iaRDMGuWYsgM7wG0z21e/JI= 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=Na7DaqpO; 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="Na7DaqpO" 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:To:From:Subject:Message-ID:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description; bh=wOS95Ra8vpgZqPPtuGigA2/jRdxnP7FegxOh9WR7HSk=; b=Na7DaqpOQpVs8/QFZ01yiPibu9 j0jxll2rBp9W+CxW3On84+Gp0ttYkZrEf+41K9VqQmyv2ncgjYUM27ph53mbamt3q1bA0lNqlPsbG KFuCJ/MsLVuLdKH23azJcAR2zaD28qtIEtL4Iz1e9OSwZ07mjITENaTX8yWQ4mAvq6AafmmnRoV66 QCob0faL4ovWeBAvsGTPknmeuOH0yn9s7/dUSlWicfmGvdo2GuPp2FQGBc83+DnDqpv1/pOnhzCR7 /YhMsFdOvisPcRb5GnB5HjXGYdAQ7QnRdmI6kIrxEcYCBPu0d4AskIDTyyDlw1i9uF8JZs9NyiH1o roJ4dWsQ==; Received: from [2001:8b0:10b:5:a10:bfc:a858:f6d3] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1x4jdj-00000002wwG-35Wi; Thu, 10 Sep 2026 18:36:52 +0000 Message-ID: Subject: Re: [PATCH v6 00/51] x86: Try to wrangle PV clocks vs. TSC From: David Woodhouse To: Sean Christopherson , Kiryl Shutsemau , Rick Edgecombe , Paolo Bonzini , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Ajay Kaher , Alexey Makhalov , Jan Kiszka , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Juergen Gross , Daniel Lezcano , Thomas Gleixner , John Stultz , Vitaly Kuznetsov , Broadcom internal kernel review list , Boris Ostrovsky , Stephen Boyd , Miroslav Lichvar , x86@kernel.org, linux-coco@lists.linux.dev, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, Michael Kelley , Tom Lendacky , Nikunj A Dadhania , Thomas Gleixner Date: Thu, 10 Sep 2026 19:36:22 +0100 In-Reply-To: References: <20260806233609.212337-1-seanjc@google.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-mC8wbvMi0aPBUSksNuNl" User-Agent: Evolution 3.60.3-0ubuntu1~ppa10~24.04 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 --=-mC8wbvMi0aPBUSksNuNl Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-09-10 at 10:59 -0700, Sean Christopherson wrote: > On Thu, Aug 06, 2026, Sean Christopherson wrote: > > The primary goal of this series to fix flaws with SNP and TDX guests wh= ere a > > PV clock provided by the untrusted hypervisor is used instead of the se= cure > > TSC that is controlled by trusted firmware. > >=20 > > The secondary goal is modernize running under KVM.=C2=A0 Currently, KVM= guests will > > use TSC for clocksource, but not sched_clock.=C2=A0 And Linux-as-a-KVM-= guest doesn't > > support paravirt enumeration of the TSC/APIC frequencies, even though Q= EMU > > provides that information by default. > >=20 > > The tertiary goal is to clean up the PV clock code to deduplicate logic= across > > hypervisors, and to hopefully make it all easier to maintain going forw= ard. > >=20 > > The quaternary goal is to clean up the TSC calibration code, which was = made > > stupidly hard to follow by hypervisor code mixing in with the native > > calibration routines, instead of being implemented as a pure alternativ= e. > >=20 > > Note, the VMware and Xen changes still probably should get acks from th= ose > > maintainers, as my understanding of what they're trying to do may be fl= awed. >=20 > This (thankfully) still applies cleanly.=C2=A0 What can I do to help move= this forward? Nudge Thomas to spot that this is guest-side and we want him to pick it up,= I guess? --=-mC8wbvMi0aPBUSksNuNl 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 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