Commit d31d498d authored by Kunkun Jiang's avatar Kunkun Jiang Committed by Dongxu Sun
Browse files

KVM: arm64: vgic-v3: Clearing pending status of vtimer on guest reset 

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8K89F


CVE: NA

------------------------------------------------------------------

On reset, userspace clears pending status for all PPIs and SGIs by
writing all 0's to GICR_ISPENDR0. The pending state of vtimer
interrupt is somehow staying in redistributor and we have to
explicitly clear it...

Signed-off-by: default avatarZenghui Yu <yuzenghui@huawei.com>
Signed-off-by: default avatarKunkun Jiang <jiangkunkun@huawei.com>
Signed-off-by: default avatarDongxu Sun <sundongxu3@huawei.com>
parent fd291462

arch/arm64/kvm/vgic/vgic-mmio-v3.c

+13 −0
Original line number Diff line number Diff line
@@ -365,6 +365,19 @@ static int vgic_v3_uaccess_write_pending(struct kvm_vcpu *vcpu, 
			irq->pending_latch = true;

			vgic_queue_irq_unlock(vcpu->kvm, irq, flags);

		} else {

			/**

			 * workaround: On reset, userspace clears pending status

			 * for all PPIs and SGIs by writing all 0's to

			 * GICR_ISPENDR0. The pending state of vtimer interrupt

			 * is somehow staying in redistributor and we have to

			 * explicitly clear it...

			 *

			 * P.S., irq->vtimer_info is NULL on restore.

			 */

			if (irq->vtimer_info)

				WARN_ON_ONCE(irq_set_irqchip_state(irq->host_irq,

							IRQCHIP_STATE_PENDING,

							false));

			irq->pending_latch = false;

			raw_spin_unlock_irqrestore(&irq->irq_lock, flags);

		}