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: Glauber Costa <glommer@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

diff --git a/hw/pc.c b/hw/pc.c
index 38493907020b22685886dd6e965da7ffcd6c8227..6e3d03f6c8184003cace9de59939b4d7095d3a49 100644 (file)
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -899,7 +899,7 @@ vga_bios_error:
             load_linux(phys_ram_base + option_rom_offset,
                        kernel_filename, initrd_filename, kernel_cmdline);
             cpu_register_physical_memory(0xd0000, TARGET_PAGE_SIZE,
-                                         option_rom_offset | IO_MEM_ROM);
+                                         option_rom_offset);
             offset = TARGET_PAGE_SIZE;
         }