linux-kernel - Re: [PATCH v2 0/2] Dirtying, failing memop: don't indicate suppression

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Date:   Mon, 25 Apr 2022 18:30:26 +0200
From:   Christian Borntraeger <borntraeger@...ux.ibm.com>
To:     Janis Schoetterl-Glausch <scgl@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>
Cc:     David Hildenbrand <david@...hat.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH v2 0/2] Dirtying, failing memop: don't indicate
 suppression

Am 25.04.22 um 12:01 schrieb Janis Schoetterl-Glausch:
> If a memop fails due to key checked protection, after already having
> written to the guest, don't indicate suppression to the guest, as that
> would imply that memory wasn't modified.
> 
> This could be considered a fix to the code introducing storage key
> support, however this is a bug in KVM only if we emulate an
> instructions writing to an operand spanning multiple pages, which I
> don't believe we do.
> 

Thanks applied. I think it makes sense for 5.18 nevertheless.

> v1 -> v2
>   * Reword commit message of patch 1
> 
> Janis Schoetterl-Glausch (2):
>    KVM: s390: Don't indicate suppression on dirtying, failing memop
>    KVM: s390: selftest: Test suppression indication on key prot exception
> 
>   arch/s390/kvm/gaccess.c                   | 47 ++++++++++++++---------
>   tools/testing/selftests/kvm/s390x/memop.c | 43 ++++++++++++++++++++-
>   2 files changed, 70 insertions(+), 20 deletions(-)
> 
> 
> base-commit: af2d861d4cd2a4da5137f795ee3509e6f944a25b