KVM: arm64: Restructure the point where has_run_once is advertised

Restructure kvm_vcpu_first_run_init() to set the has_run_once
flag after having completed all the "run once" activities.

This includes moving the flip of the userspace irqchip static key
to a point where nothing can fail.

Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index e939b3d..b30b05a 100644 (file)
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -600,8 +600,6 @@ static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
        if (!kvm_arm_vcpu_is_finalized(vcpu))
                return -EPERM;
 
-       vcpu->arch.has_run_once = true;
-
        kvm_arm_vcpu_init_debug(vcpu);
 
        if (likely(irqchip_in_kernel(kvm))) {
@@ -612,12 +610,6 @@ static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
                ret = kvm_vgic_map_resources(kvm);
                if (ret)
                        return ret;
-       } else {
-               /*
-                * Tell the rest of the code that there are userspace irqchip
-                * VMs in the wild.
-                */
-               static_branch_inc(&userspace_irqchip_in_use);
        }
 
        ret = kvm_timer_enable(vcpu);
@@ -625,6 +617,18 @@ static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
                return ret;
 
        ret = kvm_arm_pmu_v3_enable(vcpu);
+       if (ret)
+               return ret;
+
+       if (!irqchip_in_kernel(kvm)) {
+               /*
+                * Tell the rest of the code that there are userspace irqchip
+                * VMs in the wild.
+                */
+               static_branch_inc(&userspace_irqchip_in_use);
+       }
+
+       vcpu->arch.has_run_once = true;
 
        /*
         * Initialize traps for protected VMs.