Commit f8d8a944 authored by Alexey Kardashevskiy's avatar Alexey Kardashevskiy Committed by Alex Williamson
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vfio: Unregister IOMMU notifiers when container is destroyed 



On systems with guest visible IOMMU, adding a new memory region onto
PCI bus calls vfio_listener_region_add() for every DMA window. This
installs a notifier for IOMMU memory regions. The notifier is supposed
to be removed vfio_listener_region_del(), however in the case of mixed
PHB (emulated + VFIO devices) when last VFIO device is unplugged and
container gets destroyed, all existing DMA windows stay alive altogether
with the notifiers which are on the linked list which head was in
the destroyed container.

This unregisters IOMMU memory region notifier when a container is
destroyed.

Signed-off-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent fb5f8164

hw/vfio/common.c

+8 −0
Original line number Diff line number Diff line
@@ -772,11 +772,19 @@ static void vfio_disconnect_container(VFIOGroup *group) 


    if (QLIST_EMPTY(&container->group_list)) {

        VFIOAddressSpace *space = container->space;

        VFIOGuestIOMMU *giommu, *tmp;



        if (container->iommu_data.release) {

            container->iommu_data.release(container);

        }

        QLIST_REMOVE(container, next);



        QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {

            memory_region_unregister_iommu_notifier(&giommu->n);

            QLIST_REMOVE(giommu, giommu_next);

            g_free(giommu);

        }



        trace_vfio_disconnect_container(container->fd);

        close(container->fd);

        g_free(container);