File 19354-amd-migration-fix.patch of Package xen

# HG changeset patch
# User Keir Fraser <keir.fraser@citrix.com>
# Date 1237301641 0
# Node ID 10e2712907f9d149ed017d8563444142c528dd40
# Parent  d32c861460f242803f07521720aa049415be4208
[SVM] Always read zero AMD C1E control MSR to allow cross-vendor migration

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
xen-unstable changeset:   19354:4fd39881f9f185b49cd1e007b550b9ccab10d139
xen-unstable date:        Fri Mar 13 07:45:11 2009 +0000

Index: xen-3.3.1-testing/xen/arch/x86/hvm/hvm.c
===================================================================
--- xen-3.3.1-testing.orig/xen/arch/x86/hvm/hvm.c
+++ xen-3.3.1-testing/xen/arch/x86/hvm/hvm.c
@@ -1754,6 +1754,15 @@ int hvm_msr_read_intercept(struct cpu_us
         msr_content = var_range_base[index];
         break;
 
+    case MSR_K8_ENABLE_C1E:
+         /* There's no point in letting the guest see C-States.
+          * Further, this AMD-only register may be accessed if this HVM guest
+          * has been migrated to an Intel host. This fixes a guest crash
+          * in this case.
+          */
+         msr_content = 0;
+         break;
+
     default:
         return hvm_funcs.msr_read_intercept(regs);
     }