From 59f00ff9afc028053fa9281407627e95008ebd5c Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 2 Feb 2016 19:35:34 +0000 Subject: KVM: arm/arm64: vgic-v2: Avoid accessing GICH registers GICv2 registers are *slow*. As in "terrifyingly slow". Which is bad. But we're equaly bad, as we make a point in accessing them even if we don't have any interrupt in flight. A good solution is to first find out if we have anything useful to write into the GIC, and if we don't, to simply not do it. This involves tracking which LRs actually have something valid there. Reviewed-by: Christoffer Dall Signed-off-by: Marc Zyngier --- include/kvm/arm_vgic.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/kvm/arm_vgic.h') diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 13a3d53..f473fd6 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -321,6 +321,8 @@ struct vgic_cpu { /* Protected by the distributor's irq_phys_map_lock */ struct list_head irq_phys_map_list; + + u64 live_lrs; }; #define LR_EMPTY 0xff -- cgit v1.1