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author | Christoffer Dall <christoffer.dall@linaro.org> | 2017-10-27 19:30:09 +0200 |
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committer | Christoffer Dall <christoffer.dall@linaro.org> | 2018-01-02 10:05:46 +0100 |
commit | b6909a659f8d5de2df36cabb1c0505d262996a24 (patch) | |
tree | e0aa8769ddd5f3203a071b9fc90331c08d5cec73 /include/kvm/arm_vgic.h | |
parent | e40cc57bac792713ff6a1b80a1f67b54c05e5e21 (diff) | |
download | linux-b6909a659f8d5de2df36cabb1c0505d262996a24.tar.gz linux-b6909a659f8d5de2df36cabb1c0505d262996a24.tar.bz2 linux-b6909a659f8d5de2df36cabb1c0505d262996a24.zip |
KVM: arm/arm64: Support a vgic interrupt line level sample function
The GIC sometimes need to sample the physical line of a mapped
interrupt. As we know this to be notoriously slow, provide a callback
function for devices (such as the timer) which can do this much faster
than talking to the distributor, for example by comparing a few
in-memory values. Fall back to the good old method of poking the
physical GIC if no callback is provided.
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.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.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 8c896540a72c..cdbd142ca7f2 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -130,6 +130,17 @@ struct vgic_irq { u8 priority; enum vgic_irq_config config; /* Level or edge */ + /* + * Callback function pointer to in-kernel devices that can tell us the + * state of the input level of mapped level-triggered IRQ faster than + * peaking into the physical GIC. + * + * Always called in non-preemptible section and the functions can use + * kvm_arm_get_running_vcpu() to get the vcpu pointer for private + * IRQs. + */ + bool (*get_input_level)(int vintid); + void *owner; /* Opaque pointer to reserve an interrupt for in-kernel devices. */ }; @@ -331,7 +342,7 @@ void kvm_vgic_init_cpu_hardware(void); int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid, bool level, void *owner); int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq, - u32 vintid); + u32 vintid, bool (*get_input_level)(int vindid)); int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid); bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid); |