Am Dienstag, 23. Januar 2018, 00:04:01 CET schrieb Junaid Shahid:
Hi Junaid,
> gcmaes_encrypt/decrypt perform zero-copy crypto if both the source and
> destination satisfy certain conditions (single sglist entry located in
> low-mem or within a single high-mem page). But two copies are done
> otherwise, even if one of source or destination still satisfies the
> zero-copy conditions. This optimization is now extended to avoid the
> copy on the side that does satisfy the zero-copy conditions.
>
> Signed-off-by: Junaid Shahid <junaids@xxxxxxxxxx>
> ---
> arch/x86/crypto/aesni-intel_glue.c | 256
> +++++++++++++++++++------------------ 1 file changed, 134 insertions(+),
> 122 deletions(-)
>
> diff --git a/arch/x86/crypto/aesni-intel_glue.c
> b/arch/x86/crypto/aesni-intel_glue.c index 3bf3dcf29825..a46eb2d25f71
> 100644
> --- a/arch/x86/crypto/aesni-intel_glue.c
> +++ b/arch/x86/crypto/aesni-intel_glue.c
> @@ -744,136 +744,148 @@ static int generic_gcmaes_set_authsize(struct
> crypto_aead *tfm, return 0;
> }
>
> +static bool is_mappable(struct scatterlist *sgl, unsigned long len)
> +{
> + return (!PageHighMem(sg_page(sgl)) || sgl->offset + len <= PAGE_SIZE)
> + && len <= sgl->length;
Please integrate the patch https://www.mail-archive.com/linux-crypto@xxxxxxxxxxxxxxx/msg30542.html
@Herbert: If this patch series goes in, then the mentioned patch would not be
needed for the current implementation, but only for stable.
Ciao
Stephan
