On 5/8/23 23:47, Nina Schoetterl-Glausch wrote:
On Tue, 2023-04-25 at 18:14 +0200, Pierre Morel wrote:When the guest asks to change the polarization this change is forwarded to the upper layer using QAPI. The upper layer is supposed to take according decisions concerning CPU provisioning. Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx> --- qapi/machine-target.json | 33 +++++++++++++++++++++++++++++++++ hw/s390x/cpu-topology.c | 2 ++ 2 files changed, 35 insertions(+) diff --git a/qapi/machine-target.json b/qapi/machine-target.json index 3b7a0b77f4..ffde2e9cbd 100644 --- a/qapi/machine-target.json +++ b/qapi/machine-target.json @@ -391,3 +391,36 @@ 'features': [ 'unstable' ], 'if': { 'all': [ 'TARGET_S390X' , 'CONFIG_KVM' ] } } + +## +# @CPU_POLARIZATION_CHANGE: +# +# Emitted when the guest asks to change the polarization. +# +# @polarization: polarization specified by the guest +# +# Features: +# @unstable: This command may still be modified. +# +# The guest can tell the host (via the PTF instruction) whether the +# CPUs should be provisioned using horizontal or vertical polarization. +# +# On horizontal polarization the host is expected to provision all vCPUs +# equally. +# On vertical polarization the host can provision each vCPU differently. +# The guest will get information on the details of the provisioning +# the next time it uses the STSI(15) instruction. +# +# Since: 8.1 +# +# Example: +# +# <- { "event": "CPU_POLARIZATION_CHANGE", +# "data": { "polarization": 0 },I think you'd be getting "horizontal" instead of 0.
you are right.
+# "timestamp": { "seconds": 1401385907, "microseconds": 422329 } } +## +{ 'event': 'CPU_POLARIZATION_CHANGE', + 'data': { 'polarization': 'CpuS390Polarization' }, + 'features': [ 'unstable' ], + 'if': { 'all': [ 'TARGET_S390X', 'CONFIG_KVM' ] } +} diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c index e5fb976594..e8b140d623 100644 --- a/hw/s390x/cpu-topology.c +++ b/hw/s390x/cpu-topology.c @@ -17,6 +17,7 @@ #include "hw/s390x/s390-virtio-ccw.h" #include "hw/s390x/cpu-topology.h" #include "qapi/qapi-commands-machine-target.h" +#include "qapi/qapi-events-machine-target.h"/** s390_topology is used to keep the topology information. @@ -138,6 +139,7 @@ void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra) } else { s390_topology.vertical_polarization = !!fc; s390_cpu_topology_set_changed(true); + qapi_event_send_cpu_polarization_change(fc);I'm not sure I like the implicit conversation of the function code to the enum value. How about you do qapi_event_send_cpu_polarization_change(s390_topology.polarization); and rename vertical_polarization and change it's type to the enum. You can then also do + CpuS390Polarization polarization = S390_CPU_POLARIZATION_HORIZONTAL; + switch (fc) { + case S390_CPU_POLARIZATION_VERTICAL: + polarization = S390_CPU_POLARIZATION_VERTICAL; + /* fallthrough */ + case S390_CPU_POLARIZATION_HORIZONTAL: + if (s390_topology.polarization == polarization) { and use the value for the assignment further down, too.
OK, that look good. I guess I have to modify the patch 8 on handle_ptf ,
setcc(cpu, 0); } break;
