linux-kernel - Re: [PATCH] x86/cpufeatures: Add new Zhaoxin CPU features

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Date:   Tue, 7 Jul 2020 10:43:16 +0800
From:   Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To:     "Luck, Tony" <tony.luck@...el.com>
CC:     <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <x86@...nel.org>, <hpa@...or.com>,
        <pawan.kumar.gupta@...ux.intel.com>, <jpoimboe@...hat.com>,
        <peterz@...radead.org>, <thellstrom@...are.com>,
        <mgross@...ux.intel.com>, <kim.phillips@....com>,
        <linux-kernel@...r.kernel.org>, <DavidWang@...oxin.com>,
        <CooperYan@...oxin.com>, <QiyuanWang@...oxin.com>,
        <HerryYang@...oxin.com>, <CobeChen@...oxin.com>
Subject: Re: [PATCH] x86/cpufeatures: Add new Zhaoxin CPU features



On 07/07/2020 00:02, Luck, Tony wrote:
> On Mon, Jun 29, 2020 at 07:21:29PM +0800, Tony W Wang-oc wrote:
>> Add new Zhaoxin CPU features for enumeration in /proc/cpuinfo:
>> SM2, SM2_EN, SM3, SM4, SM3_EN, SM4_EN, PARALLAX, PARALLAX_EN,
>> TM3, TM3_EN, RNG2, RNG2_EN, PHE2, PHE2_EN, RSA, RSA_EN.
>>
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 0]  SM2
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 1]  SM2_EN
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 4]  SM3 SM4
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 5]  SM3_EN SM4_EN
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 16] PARALLAX
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 17] PARALLAX_EN
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 20] TM3
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 21] TM3_EN
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 22] RNG2
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 23] RNG2_EN
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 25] PHE2
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 26] PHE2_EN
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 27] RSA
>> CPUID.(EAX=0xc0000001,ECX=0):EDX[bit 28] RSA_EN
>>
>> SM2, SM3, SM4 are Chinese Cipher Security algorithm.
>> PARALLAX is a feature that automatically adjusts processors's voltage
>> as a function of temperature.
>> TM3 is Zhaoxin CPU Thermal Monitor v3.
>> RNG2 is Zhaoxin Random Number Generation v2.
>> PHE2 is Zhaoxin Padlock Hash Engine v2.
>> RSA is Zhaoxin hardware support for RSA algorithm.
> 
> Boris is on vacation, so I'll ask the question that he would ask
> if he were here ... "Are there some follow-up patches that use all
> of these feature bits?"

No for up to now.

Sincerely
TonyWWang-oc

> 
> Just adding bits to /proc/cpuinfo is of limited use.
> 
> -Tony
> .
>