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| author | Zenghui Yu <yuzenghui@huawei.com> | 2021-03-22 07:01:57 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2021-03-24 19:12:21 +0100 |
| commit | 12df7429213abbfa9632ab7db94f629ec309a58b (patch) | |
| tree | ac0405d87befce445b00dd89c622910f9bc0e147 /arch/arm64 | |
| parent | KVM: arm64: GICv4.1: Try to save VLPI state in save_pending_tables (diff) | |
| download | linux-12df7429213abbfa9632ab7db94f629ec309a58b.tar.xz linux-12df7429213abbfa9632ab7db94f629ec309a58b.zip | |
KVM: arm64: GICv4.1: Restore VLPI pending state to physical side
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
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kvm/vgic/vgic-v4.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm64/kvm/vgic/vgic-v4.c b/arch/arm64/kvm/vgic/vgic-v4.c index ac029ba3d337..c1845d8f5f7e 100644 --- a/arch/arm64/kvm/vgic/vgic-v4.c +++ b/arch/arm64/kvm/vgic/vgic-v4.c @@ -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; |