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V" , Emi Kisanuki , Vishal Annapurve , WeiLin.Chang@arm.com, Lorenzo Pieralisi References: <20261102141304.126883-1-steven.price@arm.com> <20261102141304.126883-4-steven.price@arm.com> Content-Language: en-US From: Suzuki K Poulose In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Kohei On 04/11/2026 10:27, Kohei Enju wrote: > On 11/04 19:23, Kohei Enju wrote: >> Hi Steven, >> >> On 11/02 14:12, Steven Price wrote: >>> 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 >>> --- >>> 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 >>> #include >>> >>> #include >>> @@ -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; >> >> From an admin/operator's perspective, kvm_rmi_is_available would >> silently remain FALSE in either of the following cases: >> - kvm-arm.mode=rmm is set, but RMI is not available for some reason. We could add a kvm_info() message for this. >> - RMI is available, but the admin forgot to set kvm-arm.mode=rmm. But not this one. We are additionally planning to move the RMM activation to gate on kvm-arm.mode=rmm. I will send out a patch soon. Cheers Suzuki