Hi,
while implementing core dumping functionality for the libxl driver
of libvirt, I discovered an issue with mapping pages of a pv guest.
After dumping the core of a pv guest the domain was not cleared up
properly and some pages were not unmapped. This issue is similar
to the one reported here:
http://lists.xensource.com/archives/html/xen-devel/2011-05/msg01314.html
In xc_domain_dumpcore_via_callback in the file xc_core.c the function
xc_core_arch_map_p2m is called to map P2M_FL_ENTRIES pages to the
variable p2m.
But to unmap the pages later, the dinfo->p2m_size has to be set accordingly.
This was not done, instead a variable named p2m_size was set.
This way P2M_FL_ENTRIES was always zero and the pages were left mapped.
The following patch fixes this.
Best regards,
Markus
Signed-off-by: Markus Groß <gross <at> univention.de>
diff -r 7c7ef1b6f4e5 tools/libxc/xc_core.c
--- a/tools/libxc/xc_core.c Tue Apr 26 14:11:18 2011 +0100
+++ b/tools/libxc/xc_core.c Mon May 23 13:36:23 2011 +0200
@@ -468,7 +468,6 @@
int auto_translated_physmap;
xen_pfn_t *p2m = NULL;
- unsigned long p2m_size = 0;
struct xen_dumpcore_p2m *p2m_array = NULL;
uint64_t *pfn_array = NULL;
@@ -569,7 +568,7 @@
}
sts = xc_core_arch_map_p2m(xch, dinfo->guest_width, &info,
live_shinfo,
- &p2m, &p2m_size);
+ &p2m, &dinfo->p2m_size);
if ( sts != 0 )
goto out;
}
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