[PATCH BACKPORTv2 4.19, 5.0, 5.1] crypto: vmx - ghash: do nosimd fallback manually

[Greg KH]

On Mon, Jun 03, 2019 at 12:08:48PM +1000, Daniel Axtens wrote:
> commit 357d065a44cdd77ed5ff35155a989f2a763e96ef upstream.
> [backported: the VMX driver did not use crypto_simd_usable() until
>  after 5.1]
> 
> VMX ghash was using a fallback that did not support interleaving simd
> and nosimd operations, leading to failures in the extended test suite.
> 
> If I understood correctly, Eric's suggestion was to use the same
> data format that the generic code uses, allowing us to call into it
> with the same contexts. I wasn't able to get that to work - I think
> there's a very different key structure and data layout being used.
> 
> So instead steal the arm64 approach and perform the fallback
> operations directly if required.
> 
> Fixes: cc333cd68dfa ("crypto: vmx - Adding GHASH routines for VMX module")
> Cc: stable at vger.kernel.org # v4.1+
> Reported-by: Eric Biggers <ebiggers at google.com>
> Signed-off-by: Daniel Axtens <dja at axtens.net>
> Acked-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
> Tested-by: Michael Ellerman <mpe at ellerman.id.au>
> Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
> Signed-off-by: Daniel Axtens <dja at axtens.net>
> ---
> 
> v2: do stable backport form correctly.

Thanks for all of these, now queued up.

greg k-h