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xen: handle access to MSR_AMD64_NB_CFG

PATCH New Christoph Egger 1 participant 1 message Aug 13, 2009

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Christoph Egger

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PATCH 1/1 xen: handle access to MSR_AMD64_NB_CFG

Hi!

Attached patch handles HVM guest access to MSR_AMD64_NB_CFG.

Signed-off-by Christoph Egger <[email protected]>
Signature · 6 lines
---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen
Geschaeftsfuehrer: Thomas M. McCoy, Giuliano Meroni
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632
xen/arch/x86/hvm/hvm.c +12 -0
diff -r 8a9f81672c76 xen/arch/x86/hvm/hvm.c
@@ -1850,6 +1850,14 @@ int hvm_msr_read_intercept(struct cpu_us
          msr_content = 0;
          break;
 
+    case MSR_AMD64_NB_CFG:
+         /* 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:
         ret = mce_rdmsr(ecx, &lo, &hi);
         if ( ret < 0 )

@@ -1949,6 +1957,10 @@ int hvm_msr_write_intercept(struct cpu_u
             goto gp_fault;
         break;
 
+    case MSR_AMD64_NB_CFG:
+        /* ignore the write */
+        break;
+
     default:
         ret = mce_wrmsr(ecx, msr_content);
         if ( ret < 0 )

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