virtio-iommu: Remove probe_done

Now we have switched to PCIIOMMUOps to convey host IOMMU information,
the host reserved regions are transmitted when the PCIe topology is
built. This happens way before the virtio-iommu driver calls the probe
request. So let's remove the probe_done flag that allowed to check
the probe was not done before the IOMMU MR got enabled. Besides this
probe_done flag had a flaw wrt migration since it was not saved/restored.

The only case at risk is if 2 devices were plugged to a
PCIe to PCI bridge and thus aliased. First of all we
discovered in the past this case was not properly supported for
neither SMMU nor virtio-iommu on guest kernel side: see

[RFC] virtio-iommu: Take into account possible aliasing in virtio_iommu_mr()
https://lore.kernel.org/all/20230116124709.793084-1-eric.auger@redhat.com/

If this were supported by the guest kernel, it is unclear what the call
sequence would be from a virtio-iommu driver point of view.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <20240716094619.1713905-3-eric.auger@redhat.com>
Tested-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
index 4e34dacd6e7a6f0aaa2be40f82769329ab42689c..2c54c0d976010143cd99cc9c760cfedc9e790af5 100644 (file)
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -555,8 +555,6 @@ static int virtio_iommu_set_host_iova_ranges(VirtIOIOMMU *s, PCIBus *bus,
 
     current_ranges = sdev->host_resv_ranges;
 
-    g_assert(!sdev->probe_done);
-
     /* check that each new resv region is included in an existing one */
     if (sdev->host_resv_ranges) {
         range_inverse_array(iova_ranges,
@@ -956,7 +954,6 @@ static int virtio_iommu_probe(VirtIOIOMMU *s,
     }
     buf += count;
     free -= count;
-    sdev->probe_done = true;
 
     return VIRTIO_IOMMU_S_OK;
 }

diff --git a/include/hw/virtio/virtio-iommu.h b/include/hw/virtio/virtio-iommu.h
index bdb3da72d0854272b01736ccc07af0a26009d23c..7db4210b1604a7c94f1a215f8bdbd57c71c34b96 100644 (file)
--- a/include/hw/virtio/virtio-iommu.h
+++ b/include/hw/virtio/virtio-iommu.h
@@ -43,7 +43,6 @@ typedef struct IOMMUDevice {
     MemoryRegion bypass_mr;     /* The alias of shared memory MR */
     GList *resv_regions;
     GList *host_resv_ranges;
-    bool probe_done;
 } IOMMUDevice;
 
 typedef struct IOMMUPciBus {