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vfio: Do not register any IOMMU_NOTIFIER_DEVIOTLB_UNMAP notifier

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In an attempt to fix smmu/virtio-iommu - vhost regression, commit
958ec334bc ("vhost: Unbreak SMMU and virtio-iommu on dev-iotlb support")
broke virtio-iommu integration. This is due to the fact VFIO registers
IOMMU_NOTIFIER_ALL notifiers, which includes IOMMU_NOTIFIER_DEVIOTLB_UNMAP
and this latter now is rejected by the virtio-iommu. As a consequence,
the registration fails. VHOST behaves like a device with an ATC cache. The
VFIO device does not support this scheme yet.

Let's register only legacy MAP and UNMAP notifiers.

Fixes: 958ec334bc ("vhost: Unbreak SMMU and virtio-iommu on dev-iotlb support")
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <20210209213233.40985-2-eric.auger@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Eric Auger 2021-02-09 22:32:32 +01:00 committed by Alex Williamson
parent 4e779bf1a5
commit 8dca037b48
1 changed files with 1 additions and 1 deletions
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2
hw/vfio/common.c
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@ -787,7 +787,7 @@ static void vfio_listener_region_add(MemoryListener *listener,
iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr,
MEMTXATTRS_UNSPECIFIED);
iommu_notifier_init(&giommu->n, vfio_iommu_map_notify,
IOMMU_NOTIFIER_ALL,
IOMMU_NOTIFIER_IOTLB_EVENTS,
section->offset_within_region,
int128_get64(llend),
iommu_idx);