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| author | Marc Zyngier <maz@kernel.org> | 2019-11-07 16:04:11 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2019-11-08 11:13:24 +0000 |
| commit | 5bd90b0989731520f2cdcfbbe467f1271f3cc803 (patch) | |
| tree | f54a4b2b5212fa7916d6ecdf90c8eabf9ae9bff8 /virt/kvm/arm/vgic/vgic-its.c | |
| parent | 9090825fa99740f0c794f94b9cbd57ad79101228 (diff) | |
| download | linux-stable-5bd90b0989731520f2cdcfbbe467f1271f3cc803.tar.gz linux-stable-5bd90b0989731520f2cdcfbbe467f1271f3cc803.tar.bz2 linux-stable-5bd90b0989731520f2cdcfbbe467f1271f3cc803.zip | |
KVM: vgic-v4: Track the number of VLPIs per vcpu
In order to find out whether a vcpu is likely to be the target of
VLPIs (and to further optimize the way we deal with those), let's
track the number of VLPIs a vcpu can receive.
This gets implemented with an atomic variable that gets incremented
or decremented on map, unmap and move of a VLPI.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
Link: https://lore.kernel.org/r/20191107160412.30301-2-maz@kernel.org
Diffstat (limited to 'virt/kvm/arm/vgic/vgic-its.c')
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-its.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 2be6b66b3856..98c7360d9fb7 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -360,7 +360,10 @@ static int update_affinity(struct vgic_irq *irq, struct kvm_vcpu *vcpu) if (ret) return ret; + if (map.vpe) + atomic_dec(&map.vpe->vlpi_count); map.vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe; + atomic_inc(&map.vpe->vlpi_count); ret = its_map_vlpi(irq->host_irq, &map); } |