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UPSTREAM: KVM: arm64: GICv4.1: Restore VLPI pending state to physical side

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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 <lushenming@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210322060158.1584-6-lushenming@huawei.com
(cherry picked from commit 12df742921)
Signed-off-by: Will Deacon <willdeacon@google.com>
Bug: 190594147
Change-Id: I7eb7e5db5d6e251c0f65f00c814a887ef44e260f
This commit is contained in:
Zenghui Yu
2021-03-22 14:01:57 +08:00
committed by Will Deacon
parent 3f50de15c2
commit 88178a0571
1 changed files with 19 additions and 0 deletions
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19
arch/arm64/kvm/vgic/vgic-v4.c
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@@ -404,6 +404,7 @@ int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq,
struct vgic_its *its;
struct vgic_irq *irq;
struct its_vlpi_map map;
unsigned long flags;
int ret;
if (!vgic_supports_direct_msis(kvm))
@@ -449,6 +450,24 @@ int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq,
irq->host_irq = virq;
atomic_inc(&map.vpe->vlpi_count);
/* Transfer pending state */
raw_spin_lock_irqsave(&irq->irq_lock, flags);
if (irq->pending_latch) {
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.
*/
irq->pending_latch = false;
vgic_queue_irq_unlock(kvm, irq, flags);
} else {
raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
}
out:
mutex_unlock(&its->its_lock);
return ret;