Subject: [RFC PATCH v4 16/16] KVM: arm64: CCA: enable DA in realm create parameters

From: "Aneesh Kumar K.V (Arm)" <[email-masked]>
Date: Mon, 27 Apr 2026 14:23:44 +0530

Now that we have all the required steps for DA in-place, enable
DA while creating realm.

Signed-off-by: Aneesh Kumar K.V (Arm) <[email-masked]>
---
 arch/arm64/include/asm/rmi_smc.h | 1 +
 arch/arm64/kvm/rmi.c             | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/arch/arm64/include/asm/rmi_smc.h b/arch/arm64/include/asm/rmi_smc.h
index f3ad545d68b7..c02e2f087b1c 100644
--- a/arch/arm64/include/asm/rmi_smc.h
+++ b/arch/arm64/include/asm/rmi_smc.h
@@ -268,6 +268,7 @@ struct rmm_config {
 #define RMI_REALM_PARAM_FLAG_LPA2		BIT(0)
 #define RMI_REALM_PARAM_FLAG_SVE		BIT(1)
 #define RMI_REALM_PARAM_FLAG_PMU		BIT(2)
+#define RMI_REALM_PARAM_FLAG_DA			BIT(3)
 
 struct realm_params {
 	union { /* 0x0 */
diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c
index cc9e045dcae9..e041c4caee79 100644
--- a/arch/arm64/kvm/rmi.c
+++ b/arch/arm64/kvm/rmi.c
@@ -691,6 +691,9 @@ static int realm_create_rd(struct kvm *kvm)
 	if (r)
 		goto out_undelegate_tables;
 
+	/* For now default enable DA */
+	if (rmm_has_reg2_feature(RMI_FEATURE_REGISTER_2_DA))
+		params->flags |= RMI_REALM_PARAM_FLAG_DA;
 	params_phys = virt_to_phys(params);
 
 	if (rmi_realm_create(rd_phys, params_phys)) {
-- 
2.43.0