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

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Date:   Mon, 8 Mar 2021 16:30:17 +0100
From:   Claudio Imbrenda <imbrenda@...ux.ibm.com>
To:     Janosch Frank <frankja@...ux.ibm.com>
Cc:     Christian Borntraeger <borntraeger@...ibm.com>,
        linux-kernel@...r.kernel.org, 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 Mon, 8 Mar 2021 16:26:58 +0100
Janosch Frank <frankja@...ux.ibm.com> wrote:

> On 3/8/21 4:19 PM, Christian Borntraeger wrote:
> > 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?  
> 
> I'd go for the next merge window

I agree

> >>
> >> 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(-) 
>