linux-kernel - Re: [PATCH 3/3] crypto: hisilicon/sec

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Date:   Sun, 7 Feb 2021 09:02:45 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     liulongfang <liulongfang@...wei.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>, wangzhou1@...ilicon.com,
        Zaibo Xu <xuzaibo@...wei.com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] crypto: hisilicon/sec - fixes shash test error

On Sun, 7 Feb 2021 at 03:47, liulongfang <liulongfang@...wei.com> wrote:
>
> On 2021/2/5 19:44, Herbert Xu write:
> > On Fri, Feb 05, 2021 at 06:10:57PM +0800, Longfang Liu wrote:
> >> If this configuration item is not turned on,
> >> the allocation of crypto_tfm will fail when
> >> the shash algorithm calculates the hash
> >> through the software.
> >>
> >> Signed-off-by: Longfang Liu <liulongfang@...wei.com>
> >> ---
> >>  arch/arm64/configs/defconfig | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> >> index 8383016..7cfc9b6 100644
> >> --- a/arch/arm64/configs/defconfig
> >> +++ b/arch/arm64/configs/defconfig
> >> @@ -117,7 +117,7 @@ CONFIG_KVM=y
> >>  CONFIG_ARM64_CRYPTO=y
> >>  CONFIG_CRYPTO_SHA1_ARM64_CE=y
> >>  CONFIG_CRYPTO_SHA2_ARM64_CE=y
> >> -CONFIG_CRYPTO_SHA512_ARM64_CE=m
> >> +CONFIG_CRYPTO_SHA512_ARM64_CE=y
> >
> > If this is truly needed then it should be enabled through Kconfig.
> >
> > Cheers,
> >
> Hi Herbert,
> The option select CRYPTO_SHA512 already exists in Kconfig.

In that case, how can the shash TFM allocation fail?

> Can I change it to this: select CRYPTO_SHA512 || CRYPTO_SHA512_ARM64_CE

No, you cannot select expressions like that.

Could you please explain the problem you are trying to solve?