commit 6b8bb99a9cde386d72b4b7c22b92f4bdec333dab
Author: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Date:   Thu Jan 3 12:20:21 2008 +0200

    kvm: qemu: restore IO_MEM_ROM mark to bios when registering the memory with kvm
    
    We removed the IO_MEM_ROM mark for qemu, since the tpr optimization needs to
    update the bios.  However, kvm_cpu_register_physical_memory() uses the mark
    for other purposes, so keep it.  The removal broke bootstrap on older kernels.
    
    Signed-off-by: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>

diff --git a/qemu/hw/pc.c b/qemu/hw/pc.c
index 5a1b7d4..179585f 100644
--- a/qemu/hw/pc.c
+++ b/qemu/hw/pc.c
@@ -865,8 +865,7 @@ static void pc_init1(ram_addr_t ram_size, int vga_ram_size,
     if (kvm_allowed)
         kvm_cpu_register_physical_memory(0x100000 - isa_bios_size,
                                          isa_bios_size,
-                                         (bios_offset + bios_size - isa_bios_size)
-					 /* | IO_MEM_ROM */);
+                                         (bios_offset + bios_size - isa_bios_size) | IO_MEM_ROM);
 #endif