From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Tue, 14 Aug 2012 11:43:12 +0000 (+0200)
Subject: kvmvapic: Disable if there is insufficient memory
X-Git-Tag: TizenStudio_2.0_p2.3.2~208^2~3747^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a9605e0317c7a6d5e68f3a3b6708c8ef1096f4bc;p=sdk%2Femulator%2Fqemu.git

kvmvapic: Disable if there is insufficient memory

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>
---

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;