linux-kernel - Re: [patch V6 01/19] x86/cpu: Provide cpuid

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Message-ID: <87v86seya2.ffs@tglx>
Date: Wed, 14 Feb 2024 00:32:05 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Borislav Petkov <bp@...en8.de>
Cc: LKML <linux-kernel@...r.kernel.org>, x86@...nel.org, Tom Lendacky
 <thomas.lendacky@....com>, Andrew Cooper <andrew.cooper3@...rix.com>,
 Arjan van de Ven <arjan@...ux.intel.com>, Huang Rui <ray.huang@....com>,
 Juergen Gross <jgross@...e.com>, Dimitri Sivanich
 <dimitri.sivanich@....com>, Sohil Mehta <sohil.mehta@...el.com>, K Prateek
 Nayak <kprateek.nayak@....com>, Kan Liang <kan.liang@...ux.intel.com>,
 Zhang Rui <rui.zhang@...el.com>, "Paul E. McKenney" <paulmck@...nel.org>,
 Feng Tang <feng.tang@...el.com>, Andy Shevchenko <andy@...radead.org>,
 Michael Kelley <mhklinux@...look.com>, "Peter Zijlstra (Intel)"
 <peterz@...radead.org>, Wang Wendy <wendy.wang@...el.com>
Subject: Re: [patch V6 01/19] x86/cpu: Provide cpuid_read() et al.

On Tue, Feb 13 2024 at 22:36, Borislav Petkov wrote:

> On Tue, Feb 13, 2024 at 10:04:00PM +0100, Thomas Gleixner wrote:
>> +static inline void __cpuid_read(unsigned int leaf, unsigned int subleaf, u32 *regs)
>> +{
>> +	regs[CPUID_EAX] = leaf;
>> +	regs[CPUID_ECX] = subleaf;
>> +	__cpuid(regs, regs + 1, regs + 2, regs + 3);
>
> Yeah, 
>
> 	__cpuid(regs, regs + CPUID_EBX, regs + CPUID_ECX, regs + CPUID_EDX);
>
> explains what those numbers are.

Oops. Sorry, I missed that part of your previous reply and just
responded to the u32 *regs part. I'll send an update tomorrow.

Thanks,

        tglx