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 A43CE3823AB; Thu, 21 Aug 2025 20:09:36 +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=1755806979; cv=none; b=Knf6+KA5YKRRgJGxhLjjitbyJSRY3BAM/NPFKdupB3EHuG/C0V5cU0NPw7FUdeZaE4POCianPh82/jBUQ3aGjcZFGUw+EZvK7w5rXlpRB9dBeakp5NhZ0FlUKjWSHJ3fRZJ+98vTDSQiLuacumYzwpSiIBLtBqz3wphzDDInzJY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755806979; c=relaxed/simple; bh=7HK4DjNLbjHq0pWnQ0dFHKUxTg8f18pjTAsGbF3W/s8=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=mM1VecKAs7Kmzw2AkhqKDd2VJZC1xu7/iV6iK6EY9ocbnjdTTAv2GHf5TwSLdM76GvgGYLRhdIQgz6yLVjOerA50jSPNX7tcCShxdXQf2KOueVCTOwmv36w/9qtjPcSlh+Bx9kZU6CWmm/+SWYO36SONU7YXOBgUwDENpYZrLqQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (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=SBUt5/3f; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (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="SBUt5/3f" 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=CgsKh6PQ2X7sbamc7uSGEeb01yrHIxNuVCtONrzWHJ4=; b=SBUt5/3fPfGOxjDH2W0WkNNlty lG5n7wiKp3WNjkgfokRxgNzX2PaVFggPxkUrCZ++JwrzldPBu8i8bgV3uKCyNTD5NnjahLz5/qp0c mO0Ax0VwMDeW9jNE/N5mZO4wHkWVmpH/DkBFZgSpJFB2rFAYCoT++BmvZ2aCuGHAU8c3XJVfwUnFb P/P3dtD7Ow26SexGKkPXbR7LvMGf96N8kkqfx6qvCGKhigdat8o1wWbNrNKpvYjjiA9OnjMBS6FqV /H8lfLguR7VVfAqVvKR16nBwEEQELBmpP+nsgUMUp5HHtxTZ9VfLD/7WDO4Wc7CUIDllJFCCLh4Bu ML5NPnhA==; Received: from 54-240-197-233.amazon.com ([54.240.197.233] helo=freeip.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1upBb4-0000000D3Ny-06yh; Thu, 21 Aug 2025 20:09:18 +0000 Message-ID: <5b905902c99e13d65ea0810b0885fca97cffc74d.camel@infradead.org> Subject: Re: [PATCH v3 13/15] x86/cpu/intel: Bound the non-architectural constant_tsc model checks From: David Woodhouse To: Sohil Mehta , x86@kernel.org, Dave Hansen , Tony Luck , =?ISO-8859-1?Q?J=FCrgen?= Gross , Boris Ostrovsky , xen-devel Cc: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , Thomas Gleixner , Borislav Petkov , "H . Peter Anvin" , "Rafael J . Wysocki" , Len Brown , Andy Lutomirski , Viresh Kumar , Jean Delvare , Guenter Roeck , Zhang Rui , Andrew Cooper , David Laight , Dapeng Mi , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org, kvm@vger.kernel.org, xiaoyao.li@intel.com, Xin Li Date: Thu, 21 Aug 2025 21:09:16 +0100 In-Reply-To: <5f5f1230-f373-469c-b0d9-abc80199886e@intel.com> References: <20250219184133.816753-1-sohil.mehta@intel.com> <20250219184133.816753-14-sohil.mehta@intel.com> <6f05a6849fb7b22db35216dcf12bf537f8a43a92.camel@infradead.org> <968a179f-3da7-4c69-b798-357ea8d759eb@intel.com> <5f5f1230-f373-469c-b0d9-abc80199886e@intel.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-OQYT5kBmShxkyhQquOGw" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: linux-acpi@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 --=-OQYT5kBmShxkyhQquOGw Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2025-08-21 at 12:43 -0700, Sohil Mehta wrote: > On 8/21/2025 12:34 PM, Sohil Mehta wrote: > > On 8/21/2025 6:15 AM, David Woodhouse wrote: > >=20 > > > Hm. My test host is INTEL_HASWELL_X (0x63f). For reasons which are > > > unclear to me, QEMU doesn't set bit 8 of 0x80000007 EDX unless I > > > explicitly append ',+invtsc' to the existing '-cpu host' on its comma= nd > > > line. So now my guest doesn't think it has X86_FEATURE_CONSTANT_TSC. > > >=20 > >=20 > > Haswell should have X86_FEATURE_CONSTANT_TSC, so I would have expected > > the guest bit to be set. Until now, X86_FEATURE_CONSTANT_TSC was set > > based on the Family-model instead of the CPUID enumeration which may > > have hid the issue. > >=20 >=20 > Correction: > s/instead/as well as >=20 > > From my initial look at the QEMU implementation, this seems intentional= . > >=20 > > QEMU considers Invariant TSC as un-migratable which prevents it from > > being exposed to migratable guests (default). > > target/i386/cpu.c: > > [FEAT_8000_0007_EDX] > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 .unmigratable_flags = =3D CPUID_APM_INVTSC, > >=20 > > Can you please try '-cpu host,migratable=3Doff'? >=20 > This is mainly to verify. If confirmed, I am not sure what the long term > solution should be. Yes, explicitly turning it on with -cpu host,+invtsc does work. I've been looking into why it takes a Xen guest four seconds per vCPU in this case, but not a KVM guest. When running as a KVM guest, Linux will infer the TSC frequency from the KVM clock =E2=80=94 or better still, from CPUID; see https://lore.kernel.org/all/20250816101308.2594298-1-dwmw2@infradead.org and/or https://lore.kernel.org/all/20250227021855.3257188-36-seanjc@google.com As a Xen guest though, Linux doesn't do that. This patch in the guest should make it work without recalibrating the TSC for each vCPU... --- a/arch/x86/xen/time.c +++ b/arch/x86/xen/time.c @@ -489,7 +489,15 @@ static void xen_setup_vsyscall_time_info(void) */ static int __init xen_tsc_safe_clocksource(void) { - u32 eax, ebx, ecx, edx; + u32 eax, ebx, ecx, edx; + u64 lpj; + + /* Leaf 4, sub-leaf 0 (0x40000x03) */ + cpuid_count(xen_cpuid_base() + 3, 0, &eax, &ebx, &ecx, &edx); + + lpj =3D ((u64)ecx * 1000); + do_div(lpj, HZ); + preset_lpj =3D lpj; =20 if (!(boot_cpu_has(X86_FEATURE_CONSTANT_TSC))) return 0; @@ -500,9 +508,6 @@ static int __init xen_tsc_safe_clocksource(void) if (check_tsc_unstable()) return 0; =20 - /* Leaf 4, sub-leaf 0 (0x40000x03) */ - cpuid_count(xen_cpuid_base() + 3, 0, &eax, &ebx, &ecx, &edx); - return ebx =3D=3D XEN_CPUID_TSC_MODE_NEVER_EMULATE; } =20 ... but then I got slightly distracted by the question of why I was getting *nonsense* in those values, and why KVM is 'correcting' EAX in subleaf 2 which is supposed to be the *host* TSC, not ECX in subleaf zero... Under the Fedora 6.13.8-200 kernel I'm fairly sure the guest was seeing values in subleaf 0 ECX/EDX that *should* have been in subleaf 1 ECX/EDX, and that problem went away when I rebooted the host into a mainline kernel. 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