[PATCH 3/4] KVM: arm64: vgic-v2: Force vgic init on injection from userspace

[Marc Zyngier]

Make sure that any attempt to inject an interrupt from userspace
results in the GICv2 lazy init to take place. This is not currently
necessary as the init is also performed on *any* interrupt injection.

But as we're about to remove that, let's introduce it here.

Signed-off-by: Marc Zyngier <maz at kernel.org>
---
 arch/arm64/kvm/arm.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 176cbe8baad30..e856cf4099f42 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -51,6 +51,7 @@
 
 #include <linux/irqchip/arm-gic-v5.h>
 
+#include "vgic/vgic.h"
 #include "sys_regs.h"
 
 static enum kvm_mode kvm_mode = KVM_MODE_DEFAULT;
@@ -1475,6 +1476,12 @@ int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
 
 	trace_kvm_irq_line(irq_type, vcpu_id, irq_num, irq_level->level);
 
+	if (irqchip_in_kernel(kvm)) {
+		int ret = vgic_lazy_init(kvm);
+		if (ret)
+			return ret;
+	}
+
 	switch (irq_type) {
 	case KVM_ARM_IRQ_TYPE_CPU:
 		if (irqchip_in_kernel(kvm))
-- 
2.47.3