Re: [PATCH v3 16/17] s390x: protvirt: Handle SIGP store status correctly

[Cornelia Huck <cohuck@redhat.com>]

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On Thu, 20 Feb 2020 12:30:28 +0100
Janosch Frank <frankja@linux.ibm.com> wrote:

> On 2/20/20 12:02 PM, Cornelia Huck wrote:
> > On Fri, 14 Feb 2020 10:16:35 -0500
> > Janosch Frank <frankja@linux.ibm.com> wrote:
> >   
> >> Status storing is not done by QEMU anymore, but is handled by SIE.
> >>
> >> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> >> Reviewed-by: Thomas Huth <thuth@redhat.com>
> >> ---
> >>  target/s390x/helper.c | 4 ++++
> >>  target/s390x/sigp.c   | 1 +
> >>  2 files changed, 5 insertions(+)
> >>
> >> diff --git a/target/s390x/helper.c b/target/s390x/helper.c
> >> index a3a49164e4..3800c4b395 100644
> >> --- a/target/s390x/helper.c
> >> +++ b/target/s390x/helper.c
> >> @@ -246,6 +246,10 @@ int s390_store_status(S390CPU *cpu, hwaddr addr, bool store_arch)
> >>      hwaddr len = sizeof(*sa);
> >>      int i;
> >>  
> >> +    if (cpu->env.pv) {
> >> +        return 0;
> >> +    }
> >> +
> >>      sa = cpu_physical_memory_map(addr, &len, 1);
> >>      if (!sa) {
> >>          return -EFAULT;
> >> diff --git a/target/s390x/sigp.c b/target/s390x/sigp.c
> >> index c604f17710..da0cfb97de 100644
> >> --- a/target/s390x/sigp.c
> >> +++ b/target/s390x/sigp.c
> >> @@ -497,6 +497,7 @@ void do_stop_interrupt(CPUS390XState *env)
> >>      if (s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu) == 0) {
> >>          qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
> >>      }
> >> +    /* Storing will occur on next SIE entry for fmt 4 */  
> > 
> > What's fmt 4?  
> 
> PVMs are using a FMT 4 SCB instead of the normal format 2 one.
> 
> So I guess this should read:
> /* Storing will occur on next SIE entry for protected VMs */

Better :)

> 
> >   
> >>      if (cpu->env.sigp_order == SIGP_STOP_STORE_STATUS) {
> >>          s390_store_status(cpu, S390_STORE_STATUS_DEF_ADDR, true);
> >>      }  
> > 
> >   
> 
> 


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