Our one and only BIOS depends on a writable shadowed BIOS in the ISA range. As we have no interface to control the write property, make that region writable by default.
Signed-off-by: Jan Kiszka <jan.kis...@siemens.com> --- This unbreaks isapc for TCG, and keep it working for KVM once it starts supporting read-only memslots. hw/pc_sysfw.c | 13 +++++++++---- 1 files changed, 9 insertions(+), 4 deletions(-) diff --git a/hw/pc_sysfw.c b/hw/pc_sysfw.c index b45f0ac..027d98a 100644 --- a/hw/pc_sysfw.c +++ b/hw/pc_sysfw.c @@ -136,6 +136,7 @@ static void old_pc_system_rom_init(MemoryRegion *rom_memory) { char *filename; MemoryRegion *bios, *isa_bios; + void *isa_bios_ptr; int bios_size, isa_bios_size; int ret; @@ -167,19 +168,23 @@ static void old_pc_system_rom_init(MemoryRegion *rom_memory) g_free(filename); } - /* map the last 128KB of the BIOS in ISA space */ + /* Shadow the last 128KB of the BIOS in ISA space as RAM - + * Seabios depends on this */ isa_bios_size = bios_size; if (isa_bios_size > (128 * 1024)) { isa_bios_size = 128 * 1024; } isa_bios = g_malloc(sizeof(*isa_bios)); - memory_region_init_alias(isa_bios, "isa-bios", bios, - bios_size - isa_bios_size, isa_bios_size); + memory_region_init_ram(isa_bios, "isa-bios", isa_bios_size); + vmstate_register_ram_global(isa_bios); memory_region_add_subregion_overlap(rom_memory, 0x100000 - isa_bios_size, isa_bios, 1); - memory_region_set_readonly(isa_bios, true); + + /* copy ISA rom image from top of the ROM */ + isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); + rom_copy(isa_bios_ptr, (uint32_t)(-isa_bios_size), isa_bios_size); /* map all the bios at the top of memory */ memory_region_add_subregion(rom_memory, -- 1.7.3.4