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authorMarc Zyngier <marc.zyngier@arm.com>2016-09-06 09:28:45 +0100
committerChristoffer Dall <christoffer.dall@linaro.org>2016-09-08 12:53:00 +0200
commitfb5ee369ccd3986b28adc20d43d73a2b2c141977 (patch)
tree34722e194ff7610827d4950bd4f06aab6da3c96e /include/kvm
parent8cebe750c4d9acdfdce41ee0a83a58be973ebc5e (diff)
downloadlinux-fb5ee369ccd3986b28adc20d43d73a2b2c141977.tar.bz2
arm64: KVM: vgic-v2: Add the GICV emulation infrastructure
In order to efficiently perform the GICV access on behalf of the guest, we need to be able to avoid going back all the way to the host kernel. For this, we introduce a new hook in the world switch code, conveniently placed just after populating the fault info. At that point, we only have saved/restored the GP registers, and we can quickly perform all the required checks (data abort, translation fault, valid faulting syndrome, not an external abort, not a PTW). Coming back from the emulation code, we need to skip the emulated instruction. This involves an additional bit of save/restore in order to be able to access the guest's PC (and possibly CPSR if this is a 32bit guest). At this stage, no emulation code is provided. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'include/kvm')
-rw-r--r--include/kvm/arm_vgic.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 19b698ef3336..8eb1501fc1d0 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -20,6 +20,7 @@
#include <linux/kvm.h>
#include <linux/irqreturn.h>
#include <linux/spinlock.h>
+#include <linux/static_key.h>
#include <linux/types.h>
#include <kvm/iodev.h>
#include <linux/list.h>
@@ -265,6 +266,8 @@ struct vgic_cpu {
bool lpis_enabled;
};
+extern struct static_key_false vgic_v2_cpuif_trap;
+
int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
void kvm_vgic_early_init(struct kvm *kvm);
int kvm_vgic_create(struct kvm *kvm, u32 type);