[Xen-changelog] [xen-3.1-testing] xend: Ensure 2MB free before creating any domain. All domain creations

["Xen patchbot-3.1-testing" <patchbot-3.1-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1178011255 -3600
# Node ID ede8db6534ef0e0eae31e6f1cce9bac98c225c7c
# Parent  26643b7b48b90111701bced27808c37ca339e2bf
xend: Ensure 2MB free before creating any domain. All domain creations
have an implicit memory overhead.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
 tools/python/xen/xend/XendDomainInfo.py |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff -r 26643b7b48b9 -r ede8db6534ef tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py   Tue May 01 10:18:11 2007 +0100
+++ b/tools/python/xen/xend/XendDomainInfo.py   Tue May 01 10:20:55 2007 +0100
@@ -1419,9 +1419,13 @@ class XendDomainInfo:
                 raise VmError("HVM guest support is unavailable: is VT/AMD-V "
                               "supported by your CPU and enabled in your "
                               "BIOS?")
-            # Hack to pre-reserve some memory for HVM setup.
-            # Needed because Xen allocates 1MB by default immediately.
-            balloon.free(2*1024) # 2MB should be plenty
+
+        # Hack to pre-reserve some memory for initial domain creation.
+        # There is an implicit memory overhead for any domain creation. This
+        # overhead is greater for some types of domain than others. For
+        # example, an x86 HVM domain will have a default shadow-pagetable
+        # allocation of 1MB. We free up 2MB here to be on the safe side.
+        balloon.free(2*1024) # 2MB should be plenty
 
         self.domid = xc.domain_create(
             domid = 0,

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