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Message-ID: <127a9b07-214c-45b7-90fb-46d4303fee62@intel.com>
Date: Thu, 1 Feb 2024 08:42:21 -0800
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Subject: Re: [PATCH v2 1/3] crypto: padlock-sha: Matches CPU with Family with
 6 explicitly
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To: Tony W Wang-oc <TonyWWang-oc@zhaoxin.com>, herbert@gondor.apana.org.au,
 davem@davemloft.net, linux-crypto@vger.kernel.org,
 linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com,
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 jmattson@google.com, babu.moger@amd.com, kai.huang@intel.com,
 acme@redhat.com, aik@amd.com, namhyung@kernel.org
Cc: CobeChen@zhaoxin.com, TimGuo@zhaoxin.com, LeoLiu-oc@zhaoxin.com,
 GeorgeXue@zhaoxin.com
References: <20240123022852.2475-1-TonyWWang-oc@zhaoxin.com>
 <20240123022852.2475-2-TonyWWang-oc@zhaoxin.com>
 <54d4fe7f-2e36-4bb3-8b51-4a68510010d5@intel.com>
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From: Dave Hansen <dave.hansen@intel.com>
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In-Reply-To: <858b8c95-a0b7-4085-9ae4-824bec4d3c67@zhaoxin.com>
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On 1/31/24 18:37, Tony W Wang-oc wrote:
> 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.

Could you please take a look at how this is done for the existing crypto
algorithms?  This doesn't seem horribly new.  We have AVX-512-based
algorithms that somehow work on systems that also have AVX and AVX2
support.  Yet, there are no other vendor or family matches in the
x86_cpu_id arrays for them.  Why?