linux-kernel - Re: [PATCH v5 0/3] s390/kvm: fix MVPG when in VSIE

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Date:   Mon, 8 Mar 2021 16:19:19 +0100
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        linux-kernel@...r.kernel.org
Cc:     frankja@...ux.ibm.com, david@...hat.com, cohuck@...hat.com,
        kvm@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH v5 0/3] s390/kvm: fix MVPG when in VSIE

On 02.03.21 18:44, Claudio Imbrenda wrote:
> The current handling of the MVPG instruction when executed in a nested
> guest is wrong, and can lead to the nested guest hanging.
> 
> This patchset fixes the behaviour to be more architecturally correct,
> and fixes the hangs observed.
> 
> v4->v5
> * split kvm_s390_logical_to_effective so it can be reused for vSIE
> * fix existing comments and add some more comments
> * use the new split _kvm_s390_logical_to_effective in vsie_handle_mvpg
> 
> v3->v4
> * added PEI_ prefix to DAT_PROT and NOT_PTE macros
> * added small comment to explain what they are about
> 
> v2->v3
> * improved some comments
> * improved some variable and parameter names for increased readability
> * fixed missing handling of page faults in the MVPG handler
> * small readability improvements
> 
> v1->v2
> * complete rewrite


queued (with small fixups) for kvms390. Still not sure if this will land in master or next.
Opinions?
> 
> Claudio Imbrenda (3):
>    s390/kvm: split kvm_s390_logical_to_effective
>    s390/kvm: extend kvm_s390_shadow_fault to return entry pointer
>    s390/kvm: VSIE: correctly handle MVPG when in VSIE
> 
>   arch/s390/kvm/gaccess.c |  30 ++++++++++--
>   arch/s390/kvm/gaccess.h |  35 ++++++++++---
>   arch/s390/kvm/vsie.c    | 106 ++++++++++++++++++++++++++++++++++++----
>   3 files changed, 151 insertions(+), 20 deletions(-)
>