linux-kernel - Re: [PATCH v2 01/11] s390/uaccess: Add copy_from/to_user

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Date:   Mon, 7 Feb 2022 20:24:37 +0100
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Janis Schoetterl-Glausch <scgl@...ux.ibm.com>
Cc:     Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Jonathan Corbet <corbet@....net>, kvm@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>
Subject: Re: [PATCH v2 01/11] s390/uaccess: Add copy_from/to_user_key
 functions

On Mon, Feb 07, 2022 at 05:59:20PM +0100, Janis Schoetterl-Glausch wrote:
> Add copy_from/to_user_key functions, which perform storage key checking.
> These functions can be used by KVM for emulating instructions that need
> to be key checked.
> These functions differ from their non _key counterparts in
> include/linux/uaccess.h only in the additional key argument and must be
> kept in sync with those.
> 
> Since the existing uaccess implementation on s390 makes use of move
> instructions that support having an additional access key supplied,
> we can implement raw_copy_from/to_user_key by enhancing the
> existing implementation.
> 
> Signed-off-by: Janis Schoetterl-Glausch <scgl@...ux.ibm.com>
> ---
>  arch/s390/include/asm/uaccess.h | 22 +++++++++
>  arch/s390/lib/uaccess.c         | 81 +++++++++++++++++++++++++--------
>  2 files changed, 85 insertions(+), 18 deletions(-)

Acked-by: Heiko Carstens <hca@...ux.ibm.com>

Christian, Janosch, I think this can go via the kvm tree.