[PATCH v3 2/4] target-arm: kvm64: detect guest RAS EXTENSION feature

[Dongjiu Geng <gengdongjiu@xxxxxxxxxx>]

check if kvm supports guest RAS EXTENSION. if so, set
corresponding feature bit for vcpu.

Signed-off-by: Dongjiu Geng <gengdongjiu@xxxxxxxxxx>
---
 linux-headers/asm-arm64/kvm.h | 1 +
 linux-headers/linux/kvm.h     | 1 +
 target/arm/cpu.h              | 3 +++
 target/arm/kvm64.c            | 8 ++++++++
 4 files changed, 13 insertions(+)

diff --git a/linux-headers/asm-arm64/kvm.h b/linux-headers/asm-arm64/kvm.h
index 651ec30..acb5c4d 100644
--- a/linux-headers/asm-arm64/kvm.h
+++ b/linux-headers/asm-arm64/kvm.h
@@ -97,6 +97,7 @@ struct kvm_regs {
 #define KVM_ARM_VCPU_EL1_32BIT		1 /* CPU running a 32bit VM */
 #define KVM_ARM_VCPU_PSCI_0_2		2 /* CPU uses PSCI v0.2 */
 #define KVM_ARM_VCPU_PMU_V3		3 /* Support guest PMUv3 */
+#define KVM_ARM_VCPU_RAS_EXTENSION	4
 
 struct kvm_vcpu_init {
 	__u32 target;
diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
index 4e082a8..e0fa5b8 100644
--- a/linux-headers/linux/kvm.h
+++ b/linux-headers/linux/kvm.h
@@ -883,6 +883,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_PPC_MMU_RADIX 134
 #define KVM_CAP_PPC_MMU_HASH_V3 135
 #define KVM_CAP_IMMEDIATE_EXIT 136
+#define KVM_CAP_ARM_RAS_EXTENSION 137
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index a8aabce..1cf4a5b 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -610,6 +610,8 @@ struct ARMCPU {
 
     /* CPU has memory protection unit */
     bool has_mpu;
+    /* CPU has ras extension unit */
+    bool has_ras_extension;
     /* PMSAv7 MPU number of supported regions */
     uint32_t pmsav7_dregion;
 
@@ -1216,6 +1218,7 @@ enum arm_features {
     ARM_FEATURE_THUMB_DSP, /* DSP insns supported in the Thumb encodings */
     ARM_FEATURE_PMU, /* has PMU support */
     ARM_FEATURE_VBAR, /* has cp15 VBAR */
+    ARM_FEATURE_RAS_EXTENSION, /*has RAS extension support */
 };
 
 static inline int arm_feature(CPUARMState *env, int feature)
diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c
index 6111109..fd30a5a 100644
--- a/target/arm/kvm64.c
+++ b/target/arm/kvm64.c
@@ -518,6 +518,14 @@ int kvm_arch_init_vcpu(CPUState *cs)
         unset_feature(&env->features, ARM_FEATURE_PMU);
     }
 
+    if (kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_RAS_EXTENSION)) {
+        cpu->has_ras_extension = true;
+        cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_RAS_EXTENSION;
+    } else {
+        cpu->has_ras_extension = false;
+        unset_feature(&env->features, ARM_FEATURE_RAS_EXTENSION);
+    }
+
     /* Do KVM_ARM_VCPU_INIT ioctl */
     ret = kvm_arm_vcpu_init(cs);
     if (ret) {
-- 
1.8.3.1