[Xen-devel] [PATCH] xen: explicitly zero CR[1] in getvcpucontext for guests with no User PT

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

Some recent guests (SLES11 & PVOPS) set this to NULL when running
idle/kernel threads and the uninitialised value can confuse
suspend/resume.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

diff -r e54eeff2de54 -r fbc48e7d7ede xen/arch/x86/domctl.c
--- a/xen/arch/x86/domctl.c     Fri Mar 27 11:07:11 2009 +0900
+++ b/xen/arch/x86/domctl.c     Fri Apr 03 11:41:21 2009 +0100
@@ -1151,6 +1151,8 @@
             if ( !pagetable_is_null(v->arch.guest_table_user) )
                 c.nat->ctrlreg[1] = xen_pfn_to_cr3(
                     pagetable_get_pfn(v->arch.guest_table_user));
+            else
+                c.nat->ctrlreg[1] = 0UL;
 #endif
 
             /* Merge shadow DR7 bits into real DR7. */

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