suport device driver initialization model
According to PnP specification, Appendix B, Option ROMs that support DDIM (device driver initialization model) should have their memory space writeable. KVM deviates from us here, by removing the IO_MEM_ROM flag, to allow for PCI option ROMs (they require DDIM). However, there's absolutely no reason we can't do the same. Signed-off-by: NGlauber Costa <glommer@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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