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Message-ID: <20210104081613.100-4-lushenming@huawei.com>
Date: Mon, 4 Jan 2021 16:16:12 +0800
From: Shenming Lu <lushenming@...wei.com>
To: Marc Zyngier <maz@...nel.org>, Eric Auger <eric.auger@...hat.com>,
"Will Deacon" <will@...nel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<kvmarm@...ts.cs.columbia.edu>, <kvm@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: Alex Williamson <alex.williamson@...hat.com>,
Cornelia Huck <cohuck@...hat.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
<wanghaibin.wang@...wei.com>, <yuzenghui@...wei.com>,
<lushenming@...wei.com>
Subject: [RFC PATCH v2 3/4] KVM: arm64: GICv4.1: Restore VLPI's pending state to physical side
From: Zenghui Yu <yuzenghui@...wei.com>
When setting the forwarding path of a VLPI (switch to the HW mode),
we could 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@...wei.com>
Signed-off-by: Shenming Lu <lushenming@...wei.com>
---
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 f211a7c32704..7945d6d09cdd 100644
--- a/arch/arm64/kvm/vgic/vgic-v4.c
+++ b/arch/arm64/kvm/vgic/vgic-v4.c
@@ -454,6 +454,18 @@ 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;
--
2.19.1
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