[Qemu-devel] [RFC PATCH V3 3/7] target-arm: Enable KVM_ARM_VCPU_PSCI_0_2 feature when possible

[Pranavkumar Sawargaonkar <pranavkumar@linaro.org>]

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: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Signed-off-by: Anup Patel <anup.patel@linaro.org>
---
 target-arm/kvm32.c |    5 ++++-
 target-arm/kvm64.c |    5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/target-arm/kvm32.c b/target-arm/kvm32.c
index a4fde07..afeff01 100644
--- a/target-arm/kvm32.c
+++ b/target-arm/kvm32.c
@@ -181,7 +181,10 @@ int kvm_arch_init_vcpu(CPUState *cs)
     init.target = cpu->kvm_target;
     memset(init.features, 0, sizeof(init.features));
     if (cpu->start_powered_off) {
-        init.features[0] = 1 << KVM_ARM_VCPU_POWER_OFF;
+        init.features[0] |= 1 << KVM_ARM_VCPU_POWER_OFF;
+    }
+    if (kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PSCI_0_2)) {
+        init.features[0] |= 1 << KVM_ARM_VCPU_PSCI_0_2;
     }
     ret = kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init);
     if (ret) {
diff --git a/target-arm/kvm64.c b/target-arm/kvm64.c
index 1b7ca90..02bba45 100644
--- a/target-arm/kvm64.c
+++ b/target-arm/kvm64.c
@@ -90,7 +90,10 @@ int kvm_arch_init_vcpu(CPUState *cs)
     init.target = cpu->kvm_target;
     memset(init.features, 0, sizeof(init.features));
     if (cpu->start_powered_off) {
-        init.features[0] = 1 << KVM_ARM_VCPU_POWER_OFF;
+        init.features[0] |= 1 << KVM_ARM_VCPU_POWER_OFF;
+    }
+    if (kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PSCI_0_2)) {
+        init.features[0] |= 1 << KVM_ARM_VCPU_PSCI_0_2;
     }
     ret = kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init);
 
-- 
1.7.9.5