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SubjectRe: [RFC V1 3/7] crypto: ghash - Optimized GHASH computations
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On 1/15/21 6:04 PM, Eric Biggers wrote:
> On Fri, Jan 15, 2021 at 04:20:44PM -0800, Dave Hansen wrote:
>> On 1/15/21 4:14 PM, Dey, Megha wrote:
>>> Also, I do not know of any cores that implement PCLMULQDQ and not AES-NI.
>> That's true, bit it's also possible that a hypervisor could enumerate
>> support for PCLMULQDQ and not AES-NI. In general, we've tried to
>> implement x86 CPU features independently, even if they never show up in
>> a real CPU independently.
> We only add optimized implementations of crypto algorithms if they are actually
> useful, though. If they would never be used in practice, that's not useful.

Yes, totally agree. If it's not of practical use, it doesn't get merged.

I just wanted to share what we do for other related but independent CPU
features.

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