[Qemu-devel] [PATCH] suport device driver initialization model

[Glauber Costa <glommer@redhat.com>]

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>
---
 hw/pc.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/hw/pc.c b/hw/pc.c
index 4463bdb..19a122a 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -924,8 +924,7 @@ static void pc_init1(ram_addr_t ram_size, int vga_ram_size,
 
     option_rom_offset = qemu_ram_alloc(0x20000);
     oprom_area_size = 0;
-    cpu_register_physical_memory(0xc0000, 0x20000,
-                                 option_rom_offset | IO_MEM_ROM);
+    cpu_register_physical_memory(0xc0000, 0x20000, option_rom_offset);
 
     if (using_vga) {
         /* VGA BIOS load */
-- 
1.5.6.6