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@xxxxxxxxxx>
Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
hw/apic_common.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/hw/apic_common.c b/hw/apic_common.c
index 58e63b0..371f95d 100644
--- a/hw/apic_common.c
+++ b/hw/apic_common.c
@@ -299,7 +299,9 @@ static int apic_init_common(SysBusDevice *dev)
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;
--
1.7.3.4
--
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