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authorMarc Zyngier <maz@kernel.org>2021-03-15 16:11:58 +0300
committerMarc Zyngier <maz@kernel.org>2021-06-01 12:46:00 +0300
commit354920e79441c8a53ac73008b06d3b70ed06eb34 (patch)
treebbbf888458a716159eb5c8910d1dbc10655576fc /include/kvm
parentdb75f1a33f82ad332b6e139c5960e01999969d2c (diff)
downloadlinux-354920e79441c8a53ac73008b06d3b70ed06eb34.tar.xz
KVM: arm64: vgic: Implement SW-driven deactivation
In order to deal with these systems that do not offer HW-based deactivation of interrupts, let implement a SW-based approach: - When the irq is queued into a LR, treat it as a pure virtual interrupt and set the EOI flag in the LR. - When the interrupt state is read back from the LR, force a deactivation when the state is invalid (neither active nor pending) Interrupts requiring such treatment get the VGIC_SW_RESAMPLE flag. Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'include/kvm')
-rw-r--r--include/kvm/arm_vgic.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index e5f06df000f2..e602d848fc1a 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -99,6 +99,11 @@ enum vgic_irq_config {
* kvm_arm_get_running_vcpu() to get the vcpu pointer for private IRQs.
*/
struct irq_ops {
+ /* Per interrupt flags for special-cased interrupts */
+ unsigned long flags;
+
+#define VGIC_IRQ_SW_RESAMPLE BIT(0) /* Clear the active state for resampling */
+
/*
* Callback function pointer to in-kernel devices that can tell us the
* state of the input level of mapped level-triggered IRQ faster than
@@ -150,6 +155,11 @@ struct vgic_irq {
for in-kernel devices. */
};
+static inline bool vgic_irq_needs_resampling(struct vgic_irq *irq)
+{
+ return irq->ops && (irq->ops->flags & VGIC_IRQ_SW_RESAMPLE);
+}
+
struct vgic_register_region;
struct vgic_its;