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

[Janosch Frank <frankja@linux.ibm.com>]

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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 */

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



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