Commit 8e4ece68 authored by Kunkun Jiang's avatar Kunkun Jiang Committed by Oliver Upton
Browse files

KVM: arm64: GICv4: Do not perform a map to a mapped vLPI 



Before performing a map, let's check whether the vLPI has been
mapped.

Fixes: 196b1364 ("KVM: arm/arm64: GICv4: Wire mapping/unmapping of VLPIs in VFIO irq bypass")
Signed-off-by: default avatarKunkun Jiang <jiangkunkun@huawei.com>
Acked-by: default avatarMarc Zyngier <maz@kernel.org>
Reviewed-by: default avatarZenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20231120131210.2039-1-jiangkunkun@huawei.com


Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
parent b85ea95d

arch/arm64/kvm/vgic/vgic-v4.c

+4 −0
Original line number Diff line number Diff line
@@ -436,6 +436,10 @@ int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq, 
	if (ret)

		goto out;



	/* Silently exit if the vLPI is already mapped */

	if (irq->hw)

		goto out;



	/*

	 * Emit the mapping request. If it fails, the ITS probably

	 * isn't v4 compatible, so let's silently bail out. Holding