hw/arm/virt: allow pmu instantiation with userspace irqchip

Move the in-kernel-irqchip test to only guard the set-irq
stage, not the init stage of the PMU.  Also add the PMU to
the KVM device irq line synchronization to enable its use.
Signed-off-by: NAndrew Jones <drjones@redhat.com>
Reviewed-by: NChristoffer Dall <cdall@linaro.org>
Message-id: 1500471597-2517-4-git-send-email-drjones@redhat.com
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/arm/virt.c

@@ -496,7 +496,8 @@ static void fdt_add_pmu_nodes(const VirtMachineState *vms)
             return;
         }
         if (kvm_enabled()) {
-            if (!kvm_arm_pmu_set_irq(cpu, PPI(VIRTUAL_PMU_IRQ))) {
+            if (kvm_irqchip_in_kernel() &&
+                !kvm_arm_pmu_set_irq(cpu, PPI(VIRTUAL_PMU_IRQ))) {
                 return;
             }
             if (!kvm_arm_pmu_init(cpu)) {

target/arm/kvm.c

@@ -567,7 +567,11 @@ MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
             switched_level &= ~KVM_ARM_DEV_EL1_PTIMER;
         }
 
-        /* XXX PMU IRQ is missing */
+        if (switched_level & KVM_ARM_DEV_PMU) {
+            qemu_set_irq(cpu->pmu_interrupt,
+                         !!(run->s.regs.device_irq_level & KVM_ARM_DEV_PMU));
+            switched_level &= ~KVM_ARM_DEV_PMU;
+        }
 
         if (switched_level) {
             qemu_log_mask(LOG_UNIMP, "%s: unhandled in-kernel device IRQ %x\n",

target/arm/kvm64.c

@@ -506,8 +506,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
     if (!arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
         cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_EL1_32BIT;
     }
-    if (!kvm_irqchip_in_kernel() ||
-        !kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PMU_V3)) {
+    if (!kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PMU_V3)) {
             cpu->has_pmu = false;
     }
     if (cpu->has_pmu) {