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authorVladimir Murzin <vladimir.murzin@arm.com>2016-09-12 15:49:15 +0100
committerChristoffer Dall <christoffer.dall@linaro.org>2016-09-22 13:21:35 +0200
commit5a7a8426b2ac004b064e4106911769e0a55e7c4b (patch)
tree376e94ddd6cc275844d4dc99f034054711425e59 /include/kvm/arm_vgic.h
parent5d947a1447f98eede0778f6f59a8fe03f0c53caf (diff)
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 'include/kvm/arm_vgic.h')
-rw-r--r--include/kvm/arm_vgic.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index bb46c03eb3c7..8d22adcfe522 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -24,6 +24,7 @@
#include <linux/types.h>
#include <kvm/iodev.h>
#include <linux/list.h>
+#include <linux/jump_label.h>
#define VGIC_V3_MAX_CPUS 255
#define VGIC_V2_MAX_CPUS 8
@@ -67,6 +68,9 @@ struct vgic_global {
/* Only needed for the legacy KVM_CREATE_IRQCHIP */
bool can_emulate_gicv2;
+
+ /* GIC system register CPU interface */
+ struct static_key_false gicv3_cpuif;
};
extern struct vgic_global kvm_vgic_global_state;