[Xen-devel] [PATCH] reserve vtd_mem on guest restore

[Miroslav Rezanina <mrezanin@xxxxxxxxxx>]

There's need for free vtd_mem more memory for guest with xen-unstable c/s 
17529. 
This memory is freed when guest is created, but is not freed when guest is
restored. So restore guest fails due to not enough of memory for guest.

Following patch uses same calculation of memory to free in guest restore as is
in guest creation.

Patch:
--
diff -r 9f49667fec71 tools/python/xen/xend/XendCheckpoint.py
--- a/tools/python/xen/xend/XendCheckpoint.py   Fri Jul 30 15:22:39 2010 +0100
+++ b/tools/python/xen/xend/XendCheckpoint.py   Thu Sep 02 10:30:23 2010 +0200
@@ -277,7 +277,15 @@
         # set memory limit
         xc.domain_setmaxmem(dominfo.getDomid(), maxmem)
 
-        balloon.free(memory + shadow, dominfo)
+            vtd_mem = 0
+            info = xc.physinfo()
+            if 'hvm_directio' in info['virt_caps']:
+                # Reserve 1 page per MiB of RAM for separate VT-d page table.
+                vtd_mem = 4 * (dominfo.info['memory_static_max'] / 1024 / 1024)
+                # Round vtd_mem up to a multiple of a MiB.
+                vtd_mem = ((vtd_mem + 1023) / 1024) * 1024
+
+        balloon.free(memory + shadow + vtd_mem, dominfo)
 
         shadow_cur = xc.shadow_mem_control(dominfo.getDomid(), shadow / 1024)
         dominfo.info['shadow_memory'] = shadow_cur
-- 
Miroslav Rezanina
Software Engineer - Virtualization Team - XEN

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