[PATCH 03/11] KVM: arm64: CCA: Check for RMI support at KVM init

[Steven Price]

Check if the RMI support is sufficient for using in KVM. Specifically, we
will only support creating realm VMs when KVM is set to 'rmm' mode.

Signed-off-by: Steven Price <steven.price at arm.com>
---
 arch/arm64/kvm/Kconfig | 1 +
 arch/arm64/kvm/rmi.c   | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index cecea0820e52..d067063a3686 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -34,6 +34,7 @@ menuconfig KVM
 	select GUEST_PERF_EVENTS if PERF_EVENTS
 	select KVM_GUEST_MEMFD
 	select KVM_GENERIC_PRE_FAULT_MEMORY
+	select ARM_RMM_RMI
 	help
 	  Support hosting virtualized guest machines.
 
diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c
index 5ecc8b349869..9d118768550d 100644
--- a/arch/arm64/kvm/rmi.c
+++ b/arch/arm64/kvm/rmi.c
@@ -3,6 +3,7 @@
  * Copyright (C) 2023-2026 ARM Ltd.
  */
 
+#include <linux/arm-rmi-cmds.h>
 #include <linux/kvm_host.h>
 
 #include <asm/virt.h>
@@ -12,7 +13,8 @@ void kvm_init_rmi(void)
 	if (kvm_get_mode() != KVM_MODE_RMM)
 		return;
 
-	/* TODO: Check if the RMI is available */
+	if (!is_rmi_available())
+		return;
 
 	/* Future patch will enable static branch kvm_rmi_is_available */
 }
-- 
2.43.0