[RFC PATCH v1 3/4] KVM: arm64: GICv4.1: Restore VLPI's pending state to physical side
From: Shenming Lu <hidden>
Date: 2020-11-23 06:55:13
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, it is more consistent to 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 | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/arm64/kvm/vgic/vgic-v4.c b/arch/arm64/kvm/vgic/vgic-v4.c
index b5fa73c9fd35..cc3ab9cea182 100644
--- a/arch/arm64/kvm/vgic/vgic-v4.c
+++ b/arch/arm64/kvm/vgic/vgic-v4.c@@ -418,6 +418,18 @@ int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq, irq->host_irq = virq; atomic_inc(&map.vpe->vlpi_count); + /* Transfer pending state */ + ret = irq_set_irqchip_state(irq->host_irq, + IRQCHIP_STATE_PENDING, + irq->pending_latch); + WARN_RATELIMIT(ret, "IRQ %d", irq->host_irq); + + /* + * Let it be pruned from ap_list later and don't bother + * the List Register. + */ + irq->pending_latch = false; + out: mutex_unlock(&its->its_lock); return ret;
--
2.23.0
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