Re: [PATCH v9 05/15] s390x: protvirt: KVM intercept changes

[Cornelia Huck]

On Wed, 11 Mar 2020 09:21:41 -0400
Janosch Frank <address@hidden> wrote:

> Protected VMs no longer intercept with code 4 for an instruction
> interception. Instead they have codes 104 and 108 for protected
> instruction interception and protected instruction notification
> respectively.
> 
> The 104 mirrors the 4 interception.
> 
> The 108 is a notification interception to let KVM and QEMU know that
> something changed and we need to update tracking information or
> perform specific tasks. It's currently taken for the following
> instructions:
> 
> * spx (To inform about the changed prefix location)
> * sclp (On incorrect SCCB values, so we can inject a IRQ)
> * sigp (All but "stop and store status")
> * diag308 (Subcodes 0/1)
> 
> Of these exits only sclp errors, state changing sigps and diag308 will
> reach QEMU. QEMU will do its parts of the job, while the ultravisor
> has done the instruction part of the job.
> 
> Signed-off-by: Janosch Frank <address@hidden>
> Reviewed-by: David Hildenbrand <address@hidden>
> Reviewed-by: Christian Borntraeger <address@hidden>
> ---
>  target/s390x/kvm.c | 4 ++++
>  1 file changed, 4 insertions(+)

Reviewed-by: Cornelia Huck <address@hidden>