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authorVladimir Murzin <vladimir.murzin@arm.com>2016-09-12 14:49:15 (GMT)
committerChristoffer Dall <christoffer.dall@linaro.org>2016-09-22 11:21:35 (GMT)
commit5a7a8426b2ac004b064e4106911769e0a55e7c4b (patch)
tree376e94ddd6cc275844d4dc99f034054711425e59 /virt/kvm
parent5d947a1447f98eede0778f6f59a8fe03f0c53caf (diff)
downloadlinux-5a7a8426b2ac004b064e4106911769e0a55e7c4b.tar.xz
arm64: KVM: Use static keys for selecting the GIC backend
Currently GIC backend is selected via alternative framework and this is fine. We are going to introduce vgic-v3 to 32-bit world and there we don't have patching framework in hand, so we can either check support for GICv3 every time we need to choose which backend to use or try to optimise it by using static keys. The later looks quite promising because we can share logic involved in selecting GIC backend between architectures if both uses static keys. This patch moves arm64 from alternative to static keys framework for selecting GIC backend. For that we embed static key into vgic_global and enable the key during vgic initialisation based on what has already been exposed by the host GIC driver. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/arm/vgic/vgic-init.c4
-rw-r--r--virt/kvm/arm/vgic/vgic.c2
2 files changed, 5 insertions, 1 deletions
diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index 83777c1..8cebfbc 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -405,6 +405,10 @@ int kvm_vgic_hyp_init(void)
break;
case GIC_V3:
ret = vgic_v3_probe(gic_kvm_info);
+ if (!ret) {
+ static_branch_enable(&kvm_vgic_global_state.gicv3_cpuif);
+ kvm_info("GIC system register CPU interface enabled\n");
+ }
break;
default:
ret = -ENODEV;
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index e83b7fe..8a529a7 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -29,7 +29,7 @@
#define DEBUG_SPINLOCK_BUG_ON(p)
#endif
-struct vgic_global __section(.hyp.text) kvm_vgic_global_state;
+struct vgic_global __section(.hyp.text) kvm_vgic_global_state = {.gicv3_cpuif = STATIC_KEY_FALSE_INIT,};
/*
* Locking order is always: