Steven Price <steven.price@xxxxxxx> writes:
> Add the ioctl to activate a realm and set the static branch to enable
> access to the realm functionality if the RMM is detected.
>
> Signed-off-by: Steven Price <steven.price@xxxxxxx>
> ---
> arch/arm64/kvm/rme.c | 19 ++++++++++++++++++-
> 1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c
> index 9f415411d3b5..1eeef9e15d1c 100644
> --- a/arch/arm64/kvm/rme.c
> +++ b/arch/arm64/kvm/rme.c
> @@ -1194,6 +1194,20 @@ static int kvm_init_ipa_range_realm(struct kvm *kvm,
> return realm_init_ipa_state(realm, addr, end);
> }
>
> +static int kvm_activate_realm(struct kvm *kvm)
> +{
> + struct realm *realm = &kvm->arch.realm;
> +
> + if (kvm_realm_state(kvm) != REALM_STATE_NEW)
> + return -EINVAL;
> +
> + if (rmi_realm_activate(virt_to_phys(realm->rd)))
> + return -ENXIO;
> +
> + WRITE_ONCE(realm->state, REALM_STATE_ACTIVE);
> + return 0;
> +}
> +
> /* Protects access to rme_vmid_bitmap */
> static DEFINE_SPINLOCK(rme_vmid_lock);
> static unsigned long *rme_vmid_bitmap;
> @@ -1343,6 +1357,9 @@ int kvm_realm_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
> r = kvm_populate_realm(kvm, &args);
> break;
> }
> + case KVM_CAP_ARM_RME_ACTIVATE_REALM:
> + r = kvm_activate_realm(kvm);
> + break;
> default:
> r = -EINVAL;
> break;
> @@ -1599,5 +1616,5 @@ void kvm_init_rme(void)
> if (rme_vmid_init())
> return;
>
> - /* Future patch will enable static branch kvm_rme_is_available */
> + static_branch_enable(&kvm_rme_is_available);
>
like rsi_present, we might want to use this outside kvm, ex: for TIO.
Can we move this outside module init so that we can have a helper
like is_rme_supported()
-aneesh
