[PATCH] xm-test: ia64 min memory & arbitrarily large ramdisk

[Eric Schwartz <eric.schwartz@hp.com>]

The following patch does two things:

1) Sets a minimum of 128MB RAM for an ia64 domU; this limit was set 
after experimentation, which seems to indicate it's a reasonable lower 
limit (the 32MB limit previously in place did not allow an ia64 domU to 
start).  If there's any problem with this, I don't mind splitting the 
patch and sending it to the ia64 list, but it was small, so I hope it's 
okay to include it.

2) xm-test uses ramdisks built with uClibc, which doesn't compile on 
ia64.  I was able to create a ramdisk by hand, but as it was too large, 
the resultant domU crashed after boot.  This patch enables the use of an 
arbitrarily large ramdisk, so long as it's uncompressed.  As xm-test 
builds only uncompressed ramdisks, I figured this was reasonable for 
that specific application.  Suggestions on how to detect and handle a 
compressed ramdisk would be welcome.

diff -r 9313d0ce09f8 tools/xm-test/lib/XmTestLib/arch.py
--- a/tools/xm-test/lib/XmTestLib/arch.py       Tue Apr 24 09:26:32 2007 
-0600
+++ b/tools/xm-test/lib/XmTestLib/arch.py       Thu May 03 11:16:58 2007 
-0600
@@ -45,6 +45,9 @@ def ia_checkBuffer(buffer):
 
 def ia_minSafeMem():
     return 32
+
+def ia64_minSafeMem():
+    return 128
 
 def ia_getDeviceModel():
     """Get the path to the device model based on
@@ -139,6 +142,17 @@ if _arch == "x86" or _arch == "x86_64" o
         configDefaults = ia_HVMDefaults
     else:
         configDefaults = ia_ParavirtDefaults
+
+    # note: xm-test generates an uncompressed image, and this code
+    # expects one.  This will fail with a gzip-ed image. 
+    if configDefaults['ramdisk']:
+        rd_size = os.stat(configDefaults['ramdisk']).st_size
+        configDefaults['extra'] = 'ramdisk_size=' + str((rd_size / 1024)+1)
+
+    if _arch == "ia64":
+        minSafeMem = ia64_minSafeMem
+       configDefaults['memory'] = ia64_minSafeMem()
+
 elif _arch == "powerpc":
     minSafeMem = ppc_minSafeMem
     getDefaultKernel = ppc_getDefaultKernel