diff options
| author | Kunkun Jiang <jiangkunkun@huawei.com> | 2023-11-20 21:12:10 +0800 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2023-11-20 19:13:32 +0000 |
| commit | 8e4ece6889a5b1836b6a135827ac831a5350602a (patch) | |
| tree | 4a33ff3db34bdb72e2d36f0ead2e6d7e14755c73 /arch/arm64 | |
| parent | b85ea95d086471afb4ad062012a4d73cd328fa86 (diff) | |
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: 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>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kvm/vgic/vgic-v4.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm64/kvm/vgic/vgic-v4.c b/arch/arm64/kvm/vgic/vgic-v4.c index 339a55194b2c..74a67ad87f29 100644 --- a/arch/arm64/kvm/vgic/vgic-v4.c +++ b/arch/arm64/kvm/vgic/vgic-v4.c @@ -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 |