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

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

Fixes: 196b136498b3 ("KVM: arm/arm64: GICv4: Wire mapping/unmapping of VLPIs in VFIO irq bypass")
Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20231120131210.2039-1-jiangkunkun@huawei.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Kunkun Jiang 2023-11-20 21:12:10 +08:00 committed by Oliver Upton
parent b85ea95d08
commit 8e4ece6889
1 changed files with 4 additions and 0 deletions
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4
arch/arm64/kvm/vgic/vgic-v4.c
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@ -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