[PATCH 01/12] KVM: arm64: RMI: Export kvm_has_da_feature

Aneesh Kumar K.V (Arm)
2025-10-27T09:50:05Z

This will be used in later patches

Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
---
arch/arm64/include/asm/kvm_rmi.h | 1 +
arch/arm64/include/asm/rmi_smc.h | 1 +
arch/arm64/kvm/rmi.c | 6 ++++++
3 files changed, 8 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_rmi.h b/arch/arm64/include/asm/kvm_rmi.h
index 1b2cdaac6c50..a967061af6ed 100644
--- a/arch/arm64/include/asm/kvm_rmi.h
+++ b/arch/arm64/include/asm/kvm_rmi.h
@@ -90,6 +90,7 @@ u32 kvm_realm_ipa_limit(void);
u32 kvm_realm_vgic_nr_lr(void);
u8 kvm_realm_max_pmu_counters(void);
unsigned int kvm_realm_sve_max_vl(void);
+bool kvm_has_da_feature(void);

u64 kvm_realm_reset_id_aa64dfr0_el1(const struct kvm_vcpu *vcpu, u64 val);

diff --git a/arch/arm64/include/asm/rmi_smc.h b/arch/arm64/include/asm/rmi_smc.h
index 1000368f1bca..2ea657a87402 100644
--- a/arch/arm64/include/asm/rmi_smc.h
+++ b/arch/arm64/include/asm/rmi_smc.h
@@ -87,6 +87,7 @@ enum rmi_ripas {
#define RMI_FEATURE_REGISTER_0_GICV3_NUM_LRS GENMASK(37, 34)
#define RMI_FEATURE_REGISTER_0_MAX_RECS_ORDER GENMASK(41, 38)
#define RMI_FEATURE_REGISTER_0_Reserved GENMASK(63, 42)
+#define RMI_FEATURE_REGISTER_0_DA BIT(42)

#define RMI_REALM_PARAM_FLAG_LPA2 BIT(0)
#define RMI_REALM_PARAM_FLAG_SVE BIT(1)
diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c
index 478a73e0b35a..08f3d2362dfd 100644
--- a/arch/arm64/kvm/rmi.c
+++ b/arch/arm64/kvm/rmi.c
@@ -1738,6 +1738,12 @@ int kvm_init_realm_vm(struct kvm *kvm)
return 0;
}

+bool kvm_has_da_feature(void)
+{
+ return rmi_has_feature(RMI_FEATURE_REGISTER_0_DA);
+}
+EXPORT_SYMBOL_GPL(kvm_has_da_feature);
+
void kvm_init_rmi(void)
{
/* Only 4k page size on the host is supported */
--
2.43.0