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 6DD1A19ADA4; Sat, 6 Jun 2026 10:52:53 +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=1780743179; cv=none; b=Fyuw8vWUPZE2OOBMKsZRsSlVLNjY/21d2AwnKVDsXz0PpHfR3qpLrqkkxE+acLlaxX9lBxVCt6/DaAuCBlTUdY8m93boRQ8SIuZTH6bs8Ids5Ta6a0TGiMYJVPO4WBCjLlqousvIGQr+cog6ud6YSnUJmpkZrwlp0JR1K7ocPtY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780743179; c=relaxed/simple; bh=aMAeNZMNgr7i7Pp78hkFlqy0BHv1TcuoYaKZcq0aBj0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=FOtJt7gazruYjsp10bpXy2A5fd88ryjT2TwZdkpbfaa/1GHI+2QxQvLQPOO6yMzVTePeG2E/7c2vfgjtly01p55c8v9Di7L9JGCTMHxBDBZ/VcleN0F4K7uxGrnE6wP5YpoT/r4O5RN7equssd7XiN6UVtNKA/oI+60q1FQV8zw= 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=gy8xYWhq; 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="gy8xYWhq" 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=aMAeNZMNgr7i7Pp78hkFlqy0BHv1TcuoYaKZcq0aBj0=; b=gy8xYWhq+iEEcOAe0U8T8T73tP mnmXEjaJy4pXwcIriTPsYmGkRTj04zRwvvO2NXwk9wARpilN0jKSNKX83uyoZnkUl1WBxq3l7US7o rq1zjxI/Yhym86KytfQwUllqI+yPotv449qs5gjOPOOfzX3+190w5Dvwhir/tJpXWFZpWBLVO2C7c WvGdGohvDXRFMp0J8e/4ERmMYQxjDST1mO+xq/AmftcJzhqYuolcbLGdJU+ezbVFPj2yHJ2sFDuQZ XcoZXNy75qYC2SMjQj9M8lNIoqvWalepMiL2SYQgr6yPzevGwSgYXAmAqY47/p9QMsXgBkMoVW7p4 m+rOXjOg==; Received: from [2001:8b0:10b:5:e135:8c80:b1ce:3f2f] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wVodl-00000009dTM-3Nod; Sat, 06 Jun 2026 10:52:34 +0000 Message-ID: Subject: Re: [PATCH v4 10/47] x86/tsc: Consolidate forcing of X86_FEATURE_TSC_KNOWN_FREQ for PV code From: David Woodhouse To: Thomas Gleixner , Sean Christopherson , Paolo Bonzini , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Kiryl Shutsemau , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Ajay Kaher , Alexey Makhalov , Jan Kiszka , Andy Lutomirski , Peter Zijlstra , Juergen Gross , Daniel Lezcano , John Stultz Cc: "H. Peter Anvin" , Rick Edgecombe , Vitaly Kuznetsov , Broadcom internal kernel review list , Boris Ostrovsky , Stephen Boyd , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, xen-devel@lists.xenproject.org, Tom Lendacky , Nikunj A Dadhania , Michael Kelley Date: Sat, 06 Jun 2026 11:52:33 +0100 In-Reply-To: <877boc554l.ffs@fw13> References: <20260529144435.704127-1-seanjc@google.com> <20260529144435.704127-11-seanjc@google.com> <877boc554l.ffs@fw13> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-+zEII74NtADjQ1WcGTb7" User-Agent: Evolution 3.60.3 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 --=-+zEII74NtADjQ1WcGTb7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, 2026-06-06 at 12:34 +0200, Thomas Gleixner wrote: > On Fri, May 29 2026 at 07:43, Sean Christopherson wrote: >=20 > > Now that all paravirt code that explicitly specifies the TSC frequency > > also sets X86_FEATURE_TSC_KNOWN_FREQ, replace all of the one-off code > > and simply set X86_FEATURE_TSC_KNOWN_FREQ if the TSC frequency is known= . > >=20 > > Do NOT force set TSC_KNOWN_FREQ if the "known" TSC frequency was provid= ed > > by the user.=C2=A0 Per commit bd35c77e32e4 ("x86/tsc: Add tsc_early_khz= command > > line parameter"), one of the goals of the param is to allow the refined > > calibration work "to do meaningful error checking". > >=20 > > Note, preferring the user-provided TSC frequency over the frequency fro= m > > the hypervisor or trusted firmware, while simultaneously not treating t= he > > user-provided frequency as gospel, is obviously incongruous.=C2=A0 Swee= p the > > problem under the rug for now to avoid opening a big can of worms that > > likely doesn't have a great answer. >=20 > There is a good answer I think. >=20 > early_tsc_khz exists to cater for the overclocking crowd. On their > modded systems the firmware supplied TSC frequency (CPUID/MSR) is not > matching reality anymore. So they work around that by supplying a close > enough tsc_early_khz and then they let the refined calibration work > figure it out. >=20 > Arguably that's only relevant for bare metal systems and what's worse is > that in virtual environments the refined calibration work can fail, > which renders the TSC unstable. >=20 > So I'd rather say we change this logic to: >=20 > =C2=A0=C2=A0 if (!hypervisor_is_type(X86_HYPER_NATIVE)) { > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tsc_khz =3D x86_init.....(); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 force(X86_FEATURE_TSC_KNOWN_FREQ); > =C2=A0=C2=A0 } else if (tsc_khz_early) { > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 .... > =C2=A0=C2=A0 } else { > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ... > =C2=A0=C2=A0 } >=20 > Along with: >=20 > =C2=A0=C2=A0 if (!hypervisor_is_type(X86_HYPER_NATIVE)) { > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (tsc_khz_early) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 pr_warn("Ignoring non-se= nsical tsc_early_khz command line argument\n"); >=20 > or something daft like that. >=20 > The kernel has for various reasons always tried to cater for the needs > of users who are plagued by bonkers firmware, but we have to stop to > prioritize or treating equal ancient and modded out of spec hardware. >=20 > TBH, I consider that whole KVM clock nonsense to fall into the modded > out of spec hardware realm. Do a reality check: >=20 > =C2=A0=C2=A0 How many production systems are out there still which run VM= s on CPUs > =C2=A0=C2=A0 with a broken TSC and the lack of VM TSC scaling? >=20 > I'm not saying that we should not support the few remaining systems > anymore, but our tendency to pretend that we can keep all of this > nonsense working and at the same time making progress is just a fallacy. I don't know that we can take the KVM (and Xen) clock away from guests, but all of the *horrid* part about it is the way it attempts to cope with the possibility that the *host* timekeeping might flip away from TSC-based mode at any point in time. By the end of my outstanding cleanup series, that is the *only* thing the gtod_notifier remains for. If we can trust the hardware *and* the host kernel, then KVM could theoretically hardwire the kvmclock into 'master clock mode' where it basically just advertises the TSC=E2=86=92kvmclock relationship *once* to a= ll CPUs and it never changes. All the nonsense about updating it every time we enter a CPU could just go away completely. --=-+zEII74NtADjQ1WcGTb7 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 aDJAwtycb8yXtILj+TvfhLFhafxroXrflspavejQkEiHjNjtHnwbZ+o43g0/yxjwnarGI3kgcak7 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