| Message ID | 502A32BB.2000607@siemens.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Jan Kiszka <jan.kiszka@siemens.com> writes: > We need at least 1M of RAM to map the option ROM. Otherwise, we will > corrupt host memory or even crash. Let's put a reproducer in the commit message, if it's not too much trouble. Here's mine: $ qemu-system-x86_64 -nodefaults --enable-kvm -vnc :0 -m 640k Segmentation fault (core dumped) > Reported-by: Markus Armbruster <armbru@redhat.com> > Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Tested-by: Markus Armbruster <armbru@redhat.com> -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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;
We need at least 1M of RAM to map the option ROM. Otherwise, we will corrupt host memory or even crash. Reported-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> --- hw/apic_common.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)