x86_iommu: check if machine has PCI bus
Starting qemu with qemu-system-x86_64 -S -M isapc -device {amd|intel}-iommu leads to a segfault. The code assume PCI bus is present and tries to access the bus structure without checking. Since Intel VT-d and AMDVI should only work with PCI, add a check for PCI bus and return error if not present. Reviewed-by:Peter Xu <peterx@redhat.com> Reviewed-by:
Eduardo Habkost <ehabkost@redhat.com> Signed-off-by:
Mohammed Gamal <mgamal@redhat.com> Reviewed-by:
Thomas Huth <thuth@redhat.com>
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