Re: [PATCH 24/35] KVM: s390: protvirt: disallow one_reg

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On Mon, 10 Feb 2020 19:34:56 +0100
Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote:

> On 10.02.20 18:53, Cornelia Huck wrote:
> > On Fri,  7 Feb 2020 06:39:47 -0500
> > Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote:
> >   
> >> From: Janosch Frank <frankja@xxxxxxxxxxxxx>
> >>
> >> A lot of the registers are controlled by the Ultravisor and never
> >> visible to KVM. Some fields in the sie control block are overlayed,
> >> like gbea. As no userspace uses the ONE_REG interface on s390 it is safe
> >> to disable this for protected guests.  
> > 
> > Last round, I suggested
> > 
> > "As no known userspace uses the ONE_REG interface on s390 if sync regs
> > are available, no functionality is lost if it is disabled for protected
> > guests."  
> 
> If you think this variant is better I can use this, I am fine with either. 

Well, yes :) I was afraid that it fell through the cracks.

> > 
> > Any opinion on that?
> >   
> >>
> >> Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
> >> Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
> >> Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
> >> [borntraeger@xxxxxxxxxx: patch merging, splitting, fixing]
> >> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> >> ---
> >>  Documentation/virt/kvm/api.txt | 6 ++++--
> >>  arch/s390/kvm/kvm-s390.c       | 3 +++
> >>  2 files changed, 7 insertions(+), 2 deletions(-)  
> >   
> 




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