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virtio: unbreak virtio-pci with IOMMU after caching ring translations 

Commit c611c76417 ("virtio: add MemoryListener to cache ring
translations") registers a memory listener to dma_as. This may not
work when IOMMU is enabled: dma_as(bus_master_as) were initialized in
pcibus_machine_done() after virtio_realize(). This will cause a
segfault. Fixing this by using pci_device_iommu_address_space()
instead to make sure address space were initialized at this time.

With this fix, IOMMU device were required to be initialized before any
virtio-pci devices.

Fixes: c611c76417 ("virtio: add MemoryListener to cache ring translations")
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2017-03-01 12:10:40 +08:00 committed by Michael S. Tsirkin
parent 874adf45db
commit 96a8821d21
1 changed files with 1 additions and 1 deletions
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2
hw/virtio/virtio-pci.c
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@ -1153,7 +1153,7 @@ static AddressSpace *virtio_pci_get_dma_as(DeviceState *d)
VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
PCIDevice *dev = &proxy->pci_dev;
return pci_get_address_space(dev);
return pci_device_iommu_address_space(dev);
}
static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy,