The LPI translation cache needs to be discarded when an ITS command may affect the translation of an LPI (DISCARD and MAPD with V=0) or the routing of an LPI to a redistributor with disabled LPIs (MOVI, MOVALL). We decide to perform a full invalidation of the cache, irrespective of the LPI that is affected. Commands are supposed to be rare enough that it doesn't matter. Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx> --- virt/kvm/arm/vgic/vgic-its.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 9b6b66204b97..5254bb762e1b 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -733,6 +733,8 @@ static int vgic_its_cmd_handle_discard(struct kvm *kvm, struct vgic_its *its, * don't bother here since we clear the ITTE anyway and the * pending state is a property of the ITTE struct. */ + vgic_its_invalidate_cache(kvm); + its_free_ite(kvm, ite); return 0; } @@ -768,6 +770,8 @@ static int vgic_its_cmd_handle_movi(struct kvm *kvm, struct vgic_its *its, ite->collection = collection; vcpu = kvm_get_vcpu(kvm, collection->target_addr); + vgic_its_invalidate_cache(kvm); + return update_affinity(ite->irq, vcpu); } @@ -996,6 +1000,8 @@ static void vgic_its_free_device(struct kvm *kvm, struct its_device *device) list_for_each_entry_safe(ite, temp, &device->itt_head, ite_list) its_free_ite(kvm, ite); + vgic_its_invalidate_cache(kvm); + list_del(&device->dev_list); kfree(device); } @@ -1249,6 +1255,8 @@ static int vgic_its_cmd_handle_movall(struct kvm *kvm, struct vgic_its *its, vgic_put_irq(kvm, irq); } + vgic_its_invalidate_cache(kvm); + kfree(intids); return 0; } -- 2.20.1
