[PATCH v13 35/48] arm64: RMI: Allow checking SVE on VM instance

[Steven Price]

From: Suzuki K Poulose <suzuki.poulose@xxxxxxx>

Given we have different types of VMs supported, check the
support for SVE for the given instance of the VM to accurately
report the status.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Signed-off-by: Steven Price <steven.price@xxxxxxx>
Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx>
Reviewed-by: Joey Gouly <joey.gouly@xxxxxxx>
---
Changes since v10:
 * RME->RMI renaming.
 * Adapt to move CAP check to kvm_realm_ext_allowed().
---
 arch/arm64/include/asm/kvm_rmi.h | 2 ++
 arch/arm64/kvm/arm.c             | 2 ++
 arch/arm64/kvm/rmi.c             | 5 +++++
 3 files changed, 9 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_rmi.h b/arch/arm64/include/asm/kvm_rmi.h
index 1ee5ed0f5ab2..d6cf87de099b 100644
--- a/arch/arm64/include/asm/kvm_rmi.h
+++ b/arch/arm64/include/asm/kvm_rmi.h
@@ -87,6 +87,8 @@ struct realm_rec {
 void kvm_init_rmi(void);
 u32 kvm_realm_ipa_limit(void);
 
+bool kvm_rmi_supports_sve(void);
+
 int kvm_init_realm_vm(struct kvm *kvm);
 int kvm_activate_realm(struct kvm *kvm);
 void kvm_destroy_realm(struct kvm *kvm);
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 7d92ddb06460..3e6f1e810921 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -388,6 +388,8 @@ static bool kvm_realm_ext_allowed(long ext)
 	case KVM_CAP_ARM_PTRAUTH_GENERIC:
 	case KVM_CAP_ARM_RMI:
 		return true;
+	case KVM_CAP_ARM_SVE:
+		return kvm_rmi_supports_sve();
 	}
 	return false;
 }
diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c
index e56c8af2ad61..7cc6dc14d325 100644
--- a/arch/arm64/kvm/rmi.c
+++ b/arch/arm64/kvm/rmi.c
@@ -33,6 +33,11 @@ static bool rmi_has_feature(unsigned long feature)
 	return !!u64_get_bits(rmm_feat_reg0, feature);
 }
 
+bool kvm_rmi_supports_sve(void)
+{
+	return rmi_has_feature(RMI_FEATURE_REGISTER_0_SVE);
+}
+
 static int rmi_check_version(void)
 {
 	struct arm_smccc_res res;
-- 
2.43.0