linux-kernel - Re: [PATCH v2 1/3] crypto: padlock-sha: Matches CPU with Family with 6 explicitly

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Date: Thu, 1 Feb 2024 10:37:36 +0800
From: Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To: Dave Hansen <dave.hansen@...el.com>, <herbert@...dor.apana.org.au>,
	<davem@...emloft.net>, <linux-crypto@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<bp@...en8.de>, <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
	<hpa@...or.com>, <seanjc@...gle.com>, <kim.phillips@....com>,
	<kirill.shutemov@...ux.intel.com>, <jmattson@...gle.com>,
	<babu.moger@....com>, <kai.huang@...el.com>, <acme@...hat.com>,
	<aik@....com>, <namhyung@...nel.org>
CC: <CobeChen@...oxin.com>, <TimGuo@...oxin.com>, <LeoLiu-oc@...oxin.com>,
	<GeorgeXue@...oxin.com>
Subject: Re: [PATCH v2 1/3] crypto: padlock-sha: Matches CPU with Family with
 6 explicitly


On 2024/1/31 23:33, Dave Hansen wrote:
>
> [这封邮件来自外部发件人 谨防风险]
>
> On 1/31/24 01:45, Tony W Wang-oc wrote:
>>>>    static const struct x86_cpu_id padlock_sha_ids[] = {
>>>> -     X86_MATCH_FEATURE(X86_FEATURE_PHE, NULL),
>>>> +     X86_MATCH_VENDOR_FAM_FEATURE(CENTAUR, 6, X86_FEATURE_PHE, NULL),
>>>>         {}
>>>>    };
>>> Logically, this is saying that there are non-CENTAUR or non-family-6
>>> CPUs that set X86_FEATURE_PHE, but don't support X86_FEATURE_PHE.  Is
>>> that the case?
>> Not exactly.
>>
>> Zhaoxin CPU supports X86_FEATURE_PHE and X86_FEATURE_PHE2.
>>
>> We expect the Zhaoxin CPU to use the zhaoxin_sha driver introduced in
>> the third patch of this patch set.
>>
>> Without this patch Zhaoxin CPU will also match the padlock-sha driver too.
> I honestly have no idea what this is saying.
>
> Could you try again, please?


Sorry. It should be said that there are non-CENTAUR or non-family-6 CPUs 
that set X86_FEATURE_PHE,

and also set the new X86_FEATURE_PHE2.  For these CPUs, we expect to use 
a new driver that supports

both X86_FEATURE_PHE and X86_FEATURE_PHE2.

So we make the driver padlock-sha to matches CENTAUR Family-6 CPU 
explicitly.