Hi,
When an HVM guest is started and assigned exactly one Megabyte of RAM,
XEN will crash due to a overflow in building the E820 map in line 90 of
tools/libxc/xc_hvm_build.c:
e820entry[nr_map].size = mem_size - 0x100000 - PAGE_SIZE * 3;
If memsize is one MB, the result will be negative (and the member is
unsigned). As I don't think this is worth fixing here, I simply
increased the minimal required memory for guest from zero to one
Megabyte. Could someone check the effect on paravirtualized guests?
Regards,
Andre.
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
--
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
----to satisfy European Law for business letters:
AMD Saxony Limited Liability Company & Co. KG
Sitz (Geschäftsanschrift): Wilschdorfer Landstr. 101, 01109 Dresden,
Deutschland
Registergericht Dresden: HRA 4896
vertretungsberechtigter Komplementär: AMD Saxony LLC (Sitz Wilmington,
Delaware, USA)
Geschäftsführer der AMD Saxony LLC: Dr. Hans-R. Deppe, Thomas McCoy
diff -r 3a5722420de7 tools/python/xen/xend/XendConfig.py
--- a/tools/python/xen/xend/XendConfig.py Thu May 03 19:25:47 2007 +0100
+++ b/tools/python/xen/xend/XendConfig.py Fri May 04 15:41:15 2007 +0200
@@ -360,9 +360,9 @@ class XendConfig(dict):
if not self["memory_dynamic_max"] <= self["memory_static_max"]:
raise XendConfigError("memory_dynamic_max must be less " \
"than or equal to memory_static_max")
- if not self["memory_dynamic_max"] > 0:
+ if not self["memory_dynamic_max"] > 1048576:
raise XendConfigError("memory_dynamic_max must be greater " \
- "than zero")
+ "than one MB")
if not self["memory_static_max"] > 0:
raise XendConfigError("memory_static_max must be greater " \
"than zero")
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
Home