We need at least 1M of RAM to map the option ROM. Otherwise, we will
corrupt host memory or even crash:
$ qemu-system-x86_64 -nodefaults --enable-kvm -vnc :0 -m 640k
Segmentation fault (core dumped)
Reported-and-tested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
sysbus_init_mmio(dev, &s->io_memory);
- if (!vapic && s->vapic_control & VAPIC_ENABLE_MASK) {
+ /* Note: We need at least 1M to map the VAPIC option ROM */
+ if (!vapic && s->vapic_control & VAPIC_ENABLE_MASK &&
+ ram_size >= 1024 * 1024) {
vapic = sysbus_create_simple("kvmvapic", -1, NULL);
}
s->vapic = vapic;