[PATCH v16 36/45] KVM: arm64: CCA: Allow checking SVE on VM instance

From: Suzuki K Poulose <[email protected]>

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 <[email protected]>
Signed-off-by: Steven Price <[email protected]>
Reviewed-by: Gavin Shan <[email protected]>
Reviewed-by: Joey Gouly <[email protected]>
---
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 0fb685004d5c..13933f0e555d 100644
--- a/arch/arm64/include/asm/kvm_rmi.h
+++ b/arch/arm64/include/asm/kvm_rmi.h
@@ -98,6 +98,8 @@ struct realm_rec {
 void kvm_init_rmi(void);
 u32 kvm_rmm_ipa_limit(void);
 
+bool kvm_rmi_supports_sve(void);
+
 int kvm_init_realm(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 96e536d2dda8..3242108be7c5 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -151,6 +151,8 @@ static bool kvm_realm_ext_allowed(long ext)
 	case KVM_CAP_ARM_RMI:
 	case KVM_CAP_SYNC_MMU:
 		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 904df7c7245d..0d46768022df 100644
--- a/arch/arm64/kvm/rmi.c
+++ b/arch/arm64/kvm/rmi.c
@@ -26,6 +26,11 @@ static bool rmi_has_feature(int reg, unsigned long feature)
 	return !!u64_get_bits(rmi_feat_reg(reg), feature);
 }
 
+bool kvm_rmi_supports_sve(void)
+{
+	return rmi_has_feature(0, RMI_FEATURE_REGISTER_0_SVE);
+}
+
 u32 kvm_rmm_ipa_limit(void)
 {
 	return u64_get_bits(rmi_feat_reg(0), RMI_FEATURE_REGISTER_0_S2SZ);
-- 
2.43.0