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authorPierre Morel <pmorel@linux.ibm.com>2023-10-16 20:39:11 +0200
committerThomas Huth <thuth@redhat.com>2023-10-20 07:16:53 +0200
commitaf37bad52e7c216c044f919d6254c77be0eacbc6 (patch)
tree1433b37a9ee3822f181720969169bb67bd16a0bd /hw/s390x
parent3d6e75f4df67980479cc0912b842202f2093aeeb (diff)
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s390x/cpu topology: interception of PTF instruction
When the host supports the CPU topology facility, the PTF instruction with function code 2 is interpreted by the SIE, provided that the userland hypervisor activates the interpretation by using the KVM_CAP_S390_CPU_TOPOLOGY KVM extension. The PTF instructions with function code 0 and 1 are intercepted and must be emulated by the userland hypervisor. During RESET all CPU of the configuration are placed in horizontal polarity. Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Co-developed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com> Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com> Message-ID: <20231016183925.2384704-8-nsg@linux.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
Diffstat (limited to 'hw/s390x')
-rw-r--r--hw/s390x/cpu-topology.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
index 7ec93192..a00a4ce 100644
--- a/hw/s390x/cpu-topology.c
+++ b/hw/s390x/cpu-topology.c
@@ -90,6 +90,60 @@ static void s390_topology_init(MachineState *ms)
smp->books * smp->drawers);
}
+/*
+ * s390_handle_ptf:
+ *
+ * @register 1: contains the function code
+ *
+ * Function codes 0 (horizontal) and 1 (vertical) define the CPU
+ * polarization requested by the guest.
+ *
+ * Function code 2 is handling topology changes and is interpreted
+ * by the SIE.
+ */
+void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra)
+{
+ CpuS390Polarization polarization;
+ CPUS390XState *env = &cpu->env;
+ uint64_t reg = env->regs[r1];
+ int fc = reg & S390_TOPO_FC_MASK;
+
+ if (!s390_has_feat(S390_FEAT_CONFIGURATION_TOPOLOGY)) {
+ s390_program_interrupt(env, PGM_OPERATION, ra);
+ return;
+ }
+
+ if (env->psw.mask & PSW_MASK_PSTATE) {
+ s390_program_interrupt(env, PGM_PRIVILEGED, ra);
+ return;
+ }
+
+ if (reg & ~S390_TOPO_FC_MASK) {
+ s390_program_interrupt(env, PGM_SPECIFICATION, ra);
+ return;
+ }
+
+ polarization = S390_CPU_POLARIZATION_VERTICAL;
+ switch (fc) {
+ case 0:
+ polarization = S390_CPU_POLARIZATION_HORIZONTAL;
+ /* fallthrough */
+ case 1:
+ if (s390_topology.polarization == polarization) {
+ env->regs[r1] |= S390_PTF_REASON_DONE;
+ setcc(cpu, 2);
+ } else {
+ s390_topology.polarization = polarization;
+ s390_cpu_topology_set_changed(true);
+ setcc(cpu, 0);
+ }
+ break;
+ default:
+ /* Note that fc == 2 is interpreted by the SIE */
+ s390_program_interrupt(env, PGM_SPECIFICATION, ra);
+ }
+}
+
/**
* s390_topology_reset:
*
@@ -99,6 +153,7 @@ static void s390_topology_init(MachineState *ms)
void s390_topology_reset(void)
{
s390_cpu_topology_set_changed(false);
+ s390_topology.polarization = S390_CPU_POLARIZATION_HORIZONTAL;
}
/**