linux-kernel - Re: [PATCH v3 2/4] KVM: s390: vsie: Fix length of facility list shadowed

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Date:   Thu, 9 Nov 2023 12:21:55 +0100
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Nina Schoetterl-Glausch <nsg@...ux.ibm.com>
Cc:     Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Sven Schnelle <svens@...ux.ibm.com>,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH v3 2/4] KVM: s390: vsie: Fix length of facility list
 shadowed

On Wed, Nov 08, 2023 at 06:12:27PM +0100, Nina Schoetterl-Glausch wrote:
> The length of the facility list accessed when interpretively executing
> STFLE is the same as the hosts facility list (in case of format-0)
> When shadowing, copy only those bytes.
> The memory following the facility list need not be accessible, in which
> case we'd wrongly inject a validity intercept.
> 
> Acked-by: David Hildenbrand <david@...hat.com>
> Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
> Signed-off-by: Nina Schoetterl-Glausch <nsg@...ux.ibm.com>
> ---
>  arch/s390/include/asm/facility.h |  6 ++++++
>  arch/s390/kernel/Makefile        |  2 +-
>  arch/s390/kernel/facility.c      | 21 +++++++++++++++++++++
>  arch/s390/kvm/vsie.c             | 12 +++++++++++-
>  4 files changed, 39 insertions(+), 2 deletions(-)
>  create mode 100644 arch/s390/kernel/facility.c

For the non-KVM part:
Acked-by: Heiko Carstens <hca@...ux.ibm.com>