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

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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. 
> 
> 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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