[Xen-changelog] Avoid GPF when attempting to save / restore 64bit guests. More thought

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User smh22@xxxxxxxxxxxxxxxxxxxx
# Node ID 393256b2ead0c883e2095479e1c66d2e34d18a10
# Parent  c7508abc5b6b1aac2f8ee63fe56922f43c457cc3
Avoid GPF when attempting to save / restore 64bit guests. More thought 
required as to best way to get M2P mfns under 64...

Signed-off-by: Steven Hand <steven@xxxxxxxxxxxxx>

diff -r c7508abc5b6b -r 393256b2ead0 
linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c
--- a/linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c        Tue Nov 22 
17:44:08 2005
+++ b/linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c        Tue Nov 22 
18:10:50 2005
@@ -222,6 +222,17 @@
                unsigned long *p; 
                int i; 
 
+#if defined (__x86_64__)
+               /* 
+               ** XXX SMH: the below procedure won't work for 64 since 
+               ** we don't have access to the memory which maps the M2P. 
+               ** A proper fix will probably involve moving this 
+               ** functionality to Xen - for now just return an error 
+               ** here rather than GPF'ing in the kernel. 
+               */
+               ret = -EINVAL; 
+               break; 
+#endif
                if (copy_from_user(&m, (void *)data, sizeof(m)))
                        return -EFAULT;
 

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