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| author | Sascha Bischoff <Sascha.Bischoff@arm.com> | 2026-03-19 18:54:39 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2026-03-19 21:21:28 +0300 |
| commit | 4a9a32d3538a9d800067be113b0196271a478c6a (patch) | |
| tree | 3e30cc90b321933988c7addbc00af9d60e8fba0c | |
| parent | 8f1fbe2fd279240d6999e3a975d0a51d816e080a (diff) | |
| download | linux-4a9a32d3538a9d800067be113b0196271a478c6a.tar.xz | |
KVM: arm64: gic: Introduce queue_irq_unlock to irq_ops
There are times when the default behaviour of vgic_queue_irq_unlock()
is undesirable. This is because some GICs, such a GICv5 which is the
main driver for this change, handle the majority of the interrupt
lifecycle in hardware. In this case, there is no need for a per-VCPU
AP list as the interrupt can be made pending directly. This is done
either via the ICH_PPI_x_EL2 registers for PPIs, or with the VDPEND
system instruction for SPIs and LPIs.
The vgic_queue_irq_unlock() function is made overridable using a new
function pointer in struct irq_ops. vgic_queue_irq_unlock() is
overridden if the function pointer is non-null.
This new irq_op is unused in this change - it is purely providing the
infrastructure itself. The subsequent PPI injection changes provide a
demonstration of the usage of the queue_irq_unlock irq_op.
Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260319154937.3619520-20-sascha.bischoff@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
| -rw-r--r-- | arch/arm64/kvm/vgic/vgic.c | 3 | ||||
| -rw-r--r-- | include/kvm/arm_vgic.h | 8 |
2 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm64/kvm/vgic/vgic.c b/arch/arm64/kvm/vgic/vgic.c index 84199d2df80a..c46c0e1db436 100644 --- a/arch/arm64/kvm/vgic/vgic.c +++ b/arch/arm64/kvm/vgic/vgic.c @@ -404,6 +404,9 @@ bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq, lockdep_assert_held(&irq->irq_lock); + if (irq->ops && irq->ops->queue_irq_unlock) + return irq->ops->queue_irq_unlock(kvm, irq, flags); + retry: vcpu = vgic_target_oracle(irq); if (irq->vcpu || !vcpu) { diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index fdad0263499b..e9797c5dbbf0 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -189,6 +189,8 @@ enum vgic_irq_config { VGIC_CONFIG_LEVEL }; +struct vgic_irq; + /* * Per-irq ops overriding some common behavious. * @@ -207,6 +209,12 @@ struct irq_ops { * peaking into the physical GIC. */ bool (*get_input_level)(int vintid); + + /* + * Function pointer to override the queuing of an IRQ. + */ + bool (*queue_irq_unlock)(struct kvm *kvm, struct vgic_irq *irq, + unsigned long flags) __releases(&irq->irq_lock); }; struct vgic_irq { |