[v3,16/17] s390x: protvirt: Handle SIGP store status correctly
diff mbox series

Message ID 20200214151636.8764-17-frankja@linux.ibm.com
State New
Headers show
Series
  • s390x: Protected Virtualization support
Related show

Commit Message

Janosch Frank Feb. 14, 2020, 3:16 p.m. UTC
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(+)

Comments

Cornelia Huck Feb. 20, 2020, 11:02 a.m. UTC | #1
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?

>      if (cpu->env.sigp_order == SIGP_STOP_STORE_STATUS) {
>          s390_store_status(cpu, S390_STORE_STATUS_DEF_ADDR, true);
>      }
Janosch Frank Feb. 20, 2020, 11:30 a.m. UTC | #2
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);
>>      }
> 
>
Cornelia Huck Feb. 20, 2020, 11:34 a.m. UTC | #3
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);
> >>      }  
> > 
> >   
> 
>

Patch
diff mbox series

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