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    Subject[RFC PATCH 23/28] KVM: arm64: Allow activating realms
    Date
    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@arm.com>
    ---
    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 6ac50481a138..543e8d10f532 100644
    --- a/arch/arm64/kvm/rme.c
    +++ b/arch/arm64/kvm/rme.c
    @@ -1000,6 +1000,20 @@ static int kvm_init_ipa_range_realm(struct kvm *kvm,
    return ret;
    }

    +static int kvm_activate_realm(struct kvm *kvm)
    +{
    + struct realm *realm = &kvm->arch.realm;
    +
    + if (kvm_realm_state(kvm) != REALM_STATE_NEW)
    + return -EBUSY;
    +
    + 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;
    @@ -1175,6 +1189,9 @@ 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;
    @@ -1415,7 +1432,7 @@ int kvm_init_rme(void)

    WARN_ON(rmi_features(0, &rmm_feat_reg0));

    - /* Future patch will enable static branch kvm_rme_is_available */
    + static_branch_enable(&kvm_rme_is_available);

    return 0;
    }
    --
    2.34.1
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