target-arm: Enable KVM_ARM_VCPU_PSCI_0_2 feature when possible

Latest linux kernel supports in-kernel emulation of PSCI v0.2 but
to enable it we need to select KVM_ARM_VCPU_PSCI_0_2 feature using
KVM_ARM_VCPU_INIT ioctl.

Also, we can use KVM_ARM_VCPU_PSCI_0_2 feature for VCPU only when
linux kernel has KVM_CAP_ARM_PSCI_0_2 capability.

This patch updates kvm_arch_init_vcpu() to enable KVM_ARM_VCPU_PSCI_0_2
feature for VCPU when KVM ARM/ARM64 has KVM_CAP_ARM_PSCI_0_2 capability.
Signed-off-by: NPranavkumar Sawargaonkar <pranavkumar@linaro.org>
Signed-off-by: NAnup Patel <anup.patel@linaro.org>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Message-id: 1402901605-24551-6-git-send-email-pranavkumar@linaro.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

target-arm/kvm32.c

@@ -183,6 +183,9 @@ int kvm_arch_init_vcpu(CPUState *cs)
     if (cpu->start_powered_off) {
         cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_POWER_OFF;
     }
+    if (kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PSCI_0_2)) {
+        cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_PSCI_0_2;
+    }
 
     /* Do KVM_ARM_VCPU_INIT ioctl */
     ret = kvm_arm_vcpu_init(cs);

target-arm/kvm64.c

@@ -91,6 +91,9 @@ int kvm_arch_init_vcpu(CPUState *cs)
     if (cpu->start_powered_off) {
         cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_POWER_OFF;
     }
+    if (kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PSCI_0_2)) {
+        cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_PSCI_0_2;
+    }
 
     /* Do KVM_ARM_VCPU_INIT ioctl */
     ret = kvm_arm_vcpu_init(cs);