[PATCH v4 5/6] KVM: arm64: GICv4.1: Restore VLPI pending state to physical side
From: Shenming Lu <hidden>
Date: 2021-03-13 08:40:33
Also in:
kvm, kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
From: Zenghui Yu <yuzenghui@huawei.com> When setting the forwarding path of a VLPI (switch to the HW mode), we can also transfer the pending state from irq->pending_latch to VPT (especially in migration, the pending states of VLPIs are restored into kvm’s vgic first). And we currently send "INT+VSYNC" to trigger a VLPI to pending. Signed-off-by: Zenghui Yu <yuzenghui@huawei.com> Signed-off-by: Shenming Lu <redacted> --- arch/arm64/kvm/vgic/vgic-v4.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/arch/arm64/kvm/vgic/vgic-v4.c b/arch/arm64/kvm/vgic/vgic-v4.c
index ac029ba3d337..3b82ab80c2f3 100644
--- a/arch/arm64/kvm/vgic/vgic-v4.c
+++ b/arch/arm64/kvm/vgic/vgic-v4.c@@ -449,6 +449,24 @@ int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq, irq->host_irq = virq; atomic_inc(&map.vpe->vlpi_count); + /* Transfer pending state */ + if (irq->pending_latch) { + unsigned long flags; + + ret = irq_set_irqchip_state(irq->host_irq, + IRQCHIP_STATE_PENDING, + irq->pending_latch); + WARN_RATELIMIT(ret, "IRQ %d", irq->host_irq); + + /* + * Clear pending_latch and communicate this state + * change via vgic_queue_irq_unlock. + */ + raw_spin_lock_irqsave(&irq->irq_lock, flags); + irq->pending_latch = false; + vgic_queue_irq_unlock(kvm, irq, flags); + } + out: mutex_unlock(&its->its_lock); return ret;
--
2.19.1
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