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 761603A7848; Sat, 8 Aug 2026 14:48:34 +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=1786200519; cv=none; b=L7FAmrUkmEjpPUrCL3x9BfjOPzwQAr8hbYQNyiQmSA5UxoD/yAYLx/dzkuzOuXWeSHsfFesopXsvL3oFQtFtAbL3hoYFHAB7nctyuWDMA66zqxkc63uOTisQ4iWooO/TckEpRV+owE3NxTGFbT8I1epF3IhsBd/tQ+P6m+8GUNo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786200519; c=relaxed/simple; bh=brVyL9uxUyCaid1UVPrzMKrs/2c+m3hSu977oL0pJ6w=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:Content-Type: MIME-Version; b=f4n1YkIBvifGkAlF/mfUitkWUyE5mv+8WJJkHEGQ2hKrzgjP4Tc8sL7myix8N+a8b6c1x4ycIcN/zIS3ZCCDkrbJDWePTxq+coAxJCgbuxV3S868HvV6pwND73zGckSUmnORpr81SIIWmILQUqMXmcleS+XEXf+5fhdlo+MWclI= 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=rBOnKBSI; 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="rBOnKBSI" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:In-Reply-To: Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:References; bh=xY4a+9HON7tEJc6vDtf+k5V2duOaIaUpGsGxjtTbvEs=; b=rBOnKBSIfNIiJWrONCIgb0BG7F ylD/TZimAGdzgAEI5IcIkgHTwd38AKwrBjjDHK8RPKNMPRaT9gi1rOQtAp05FECP4gcBXxbNwzcSZ 9K27YZmoAcmeXzFZbU20BTS3wuazn5qthvl0pxWs4WDw/ylYlQ2xWJAbT4yeFH5q1J6dotOsWD9zv Gw2YN5cSgII8IIvzUEpcFxm3DuG52OAn33VXMWJ3hERGDovRuCgWlAPGLJEZdsGJpRpaPO5YFDLS9 DRRdXewcmsvVBmteeZFBT4Cgu1Y+bg5IWGwaCxnEw4fvEWMHCdYIM/mH9CPBQhK2PprWvfr/4eohc 0wwE4hEA==; Received: from [54.239.6.187] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wsiLa-00000006Xtt-3R8T; Sat, 08 Aug 2026 14:48:27 +0000 Message-ID: <58d4607c93e72094d0394c09c976142e7e179cb5.camel@infradead.org> Subject: Re: [PATCH v6 06/51] x86/sev: Don't override CPU frequency calibration for SNP's Secure TSC From: David Woodhouse To: seanjc@google.com Cc: kas@kernel.org, rick.p.edgecombe@intel.com, pbonzini@redhat.com, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, ajay.kaher@broadcom.com, alexey.makhalov@broadcom.com, jan.kiszka@siemens.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, jgross@suse.com, daniel.lezcano@kernel.org, tglx@kernel.org, jstultz@google.com, nikunj@amd.com, thomas.lendacky@amd.com, 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 Date: Sat, 08 Aug 2026 15:48:25 +0100 In-Reply-To: <20260806233609.212337-7-seanjc@google.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-2WHVA9tRtaaaro8+TEvx" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev 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 --=-2WHVA9tRtaaaro8+TEvx Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-08-06 at 16:35 -0700, Sean Christopherson wrote: > Don't override the kernel's CPU frequency calibration routine when > registering SNP's Secure TSC calibration routine. SNP (the architecture) > provides zero guarantees that the CPU runs at the same frequency as the > TSC. The justification for clobbering the CPU routine was: > > Since the difference between CPU base and TSC frequency does not apply > in this case, the same callback is being used. > > but that's simply not true. E.g. if APERF/MPERF is exposed to the VM, th= en > the CPU frequency absolutely does matter. > > While relying on heuristics and/or the untrusted hypervisor to provide th= e > CPU frequency isn't ideal, it's at least not outright wrong. > > Fixes: 73bbf3b0fbba ("x86/tsc: Init the TSC for Secure TSC guests") > Cc: Nikunj A Dadhania > Cc: Tom Lendacky > Reviewed-by: Nikunj A Dadhania > Signed-off-by: Sean Christopherson Reviewed-by: David Woodhouse I don't think I care about Sashiko's complaint. Even if we still clamp it in generic code, I think that's better than having those in the platform-specific code. --=-2WHVA9tRtaaaro8+TEvx 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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