arm64: KVM: vgic-v3: Reset LRs at boot time

In order to let the GICv3 code be more lazy in the way it
accesses the LRs, it is necessary to start with a clean slate.

Let's reset the LRs on each CPU when the vgic is probed (which
includes a round trip to EL2...).

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/arm64/kvm/hyp/vgic-v3-sr.c b/arch/arm64/kvm/hyp/vgic-v3-sr.c
index 0db426e6c13e..81349479e17c 100644
--- a/arch/arm64/kvm/hyp/vgic-v3-sr.c
+++ b/arch/arm64/kvm/hyp/vgic-v3-sr.c
@@ -321,6 +321,15 @@ void __hyp_text __vgic_v3_restore_state(struct kvm_vcpu *vcpu)
         }
 }
 
+void __hyp_text __vgic_v3_init_lrs(void)
+{
+        int max_lr_idx = vtr_to_max_lr_idx(read_gicreg(ICH_VTR_EL2));
+        int i;
+
+        for (i = 0; i <= max_lr_idx; i++)
+                __gic_v3_set_lr(0, i);
+}
+
 static u64 __hyp_text __vgic_v3_read_ich_vtr_el2(void)
 {
         return read_gicreg(ICH_VTR_EL2);