From: Sohil Mehta <sohil.mehta@intel.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: <acme@kernel.org>, <adrian.hunter@intel.com>,
<alexander.shishkin@linux.intel.com>, <bp@alien8.de>,
<dave.hansen@linux.intel.com>, <fenghua.yu@intel.com>,
<hpa@zytor.com>, <irogers@google.com>, <jdelvare@suse.com>,
<jolsa@kernel.org>, <kan.liang@linux.intel.com>,
<lenb@kernel.org>, <linux-acpi@vger.kernel.org>,
<linux-hwmon@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-perf-users@vger.kernel.org>, <linux-pm@vger.kernel.org>,
<linux@roeck-us.net>, <luto@kernel.org>, <mark.rutland@arm.com>,
<mingo@redhat.com>, <namhyung@kernel.org>, <peterz@infradead.org>,
<rafael@kernel.org>, <rui.zhang@intel.com>, <tglx@linutronix.de>,
<tony.luck@intel.com>, <viresh.kumar@linaro.org>,
<x86@kernel.org>
Subject: Re: [RFC PATCH 00/15] Prepare for new Intel family models
Date: Mon, 23 Dec 2024 11:43:44 -0800 [thread overview]
Message-ID: <e2d01538-f2b7-4f0d-8688-124531530c59@intel.com> (raw)
In-Reply-To: <f97c1228-7fca-4487-814c-6dd6ba581721@citrix.com>
On 12/20/2024 4:29 PM, Andrew Cooper wrote:
>>
>> A dump of the microcode file 06-03-02 shows:
>> 001/001: sig 0x00001632, pf_mask 0x00, 1998-06-10, rev 0x0002, size 2048
>> An archived CPUID dump [3] also says:
>> CPUID 00000001: 00001632-00000000-00000000-0183FBFF
>>
>> That would translate to a family number of 22 (0x16). This aberration is
>> not explicitly handled anywhere in the kernel so the platform might already
>> be broken. This series might make it worse for the platform if the latest
>> kernel works on it by chance.
>
> Are you sure? Bits 13:12 are the type field, and the 0x1 you've got is
> for an OverDrive processor.
>
You are right. This is indeed the processor type field. I should have
spent more time reading the specification than Wikipedia :)
> x86_family() will consider this to be family 6 as far as I can see.
>
On the bright side, we don't have to worry about breaking this CPU.
Sohil
prev parent reply other threads:[~2024-12-23 19:44 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-20 21:36 [RFC PATCH 00/15] Prepare for new Intel family models Sohil Mehta
2024-12-20 21:36 ` [RFC PATCH 01/15] x86/apic: Fix 32-bit APIC initialization for extended Intel families Sohil Mehta
2024-12-20 23:13 ` Dave Hansen
2024-12-23 20:40 ` Sohil Mehta
2024-12-20 21:36 ` [RFC PATCH 02/15] x86/apic: Fix smp init delay " Sohil Mehta
2024-12-20 23:20 ` Dave Hansen
2024-12-23 21:55 ` Sohil Mehta
2024-12-20 21:36 ` [RFC PATCH 03/15] x86/cpu/intel: Fix init_intel() checks for extended family numbers Sohil Mehta
2024-12-20 23:27 ` Dave Hansen
2024-12-23 23:41 ` Sohil Mehta
2024-12-20 21:36 ` [RFC PATCH 04/15] cpufreq: Fix the efficient idle check for Intel extended families Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 05/15] hwmon: Fix Intel family checks to include extended family numbers Sohil Mehta
2024-12-21 17:27 ` Guenter Roeck
2024-12-23 18:13 ` Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 06/15] x86/microcode: Update the Intel processor flag scan check Sohil Mehta
2024-12-21 9:11 ` Borislav Petkov
2024-12-23 19:52 ` Sohil Mehta
2024-12-21 15:46 ` Dave Hansen
2024-12-20 21:37 ` [RFC PATCH 07/15] x86/mtrr: Modify a x86_model check to an Intel VFM check Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 08/15] x86/cpu/intel: Replace early family 6 checks with VFM ones Sohil Mehta
2024-12-21 10:35 ` David Laight
2024-12-21 15:57 ` Dave Hansen
2024-12-21 16:48 ` David Laight
2024-12-21 18:30 ` Dave Hansen
2024-12-23 20:13 ` Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 09/15] x86/cpu/intel: Replace family 15 " Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 10/15] x86/cpu/intel: Replace family 5 model " Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 11/15] x86/pat: Replace Intel " Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 12/15] x86/acpi/cstate: Improve Intel family model checks Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 13/15] x86/cpu/intel: Bound the non-architectural constant_tsc " Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 14/15] perf/x86: Simplify p6_pmu_init() Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 15/15] perf/x86/p4: Replace Pentium 4 model checks with VFM ones Sohil Mehta
2024-12-21 0:29 ` [RFC PATCH 00/15] Prepare for new Intel family models Andrew Cooper
2024-12-23 19:43 ` Sohil Mehta [this message]
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