1 files changed, 12 insertions, 2 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 3439616d69f1..dfbf70e65860 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -178,6 +178,7 @@ static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0;
 static void xen_cpuid(unsigned int *ax, unsigned int *bx,
                       unsigned int *cx, unsigned int *dx)
 {
+        unsigned maskebx = ~0;
         unsigned maskecx = ~0;
         unsigned maskedx = ~0;
 
@@ -185,9 +186,16 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx,
          * Mask out inconvenient features, to try and disable as many
          * unsupported kernel subsystems as possible.
          */
-        if (*ax == 1) {
+        switch (*ax) {
+        case 1:
                 maskecx = cpuid_leaf1_ecx_mask;
                 maskedx = cpuid_leaf1_edx_mask;
+                break;
+
+        case 0xb:
+                /* Suppress extended topology stuff */
+                maskebx = 0;
+                break;
         }
 
         asm(XEN_EMULATE_PREFIX "cpuid"
@@ -197,6 +205,7 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx,
                   "=d" (*dx)
                 : "0" (*ax), "2" (*cx));
 
+        *bx &= maskebx;
         *cx &= maskecx;
         *dx &= maskedx;
 }
@@ -1075,6 +1084,8 @@ asmlinkage void __init xen_start_kernel(void)
          * Set up some pagetable state before starting to set any ptes.
          */
 
+        xen_init_mmu_ops();
+
         /* Prevent unwanted bits from being set in PTEs. */
         __supported_pte_mask &= ~_PAGE_GLOBAL;
         if (!xen_initial_domain())
@@ -1099,7 +1110,6 @@ asmlinkage void __init xen_start_kernel(void)
          */
         xen_setup_stackprotector();
 
-        xen_init_mmu_ops();
         xen_init_irq_ops();
         xen_init_cpuid_mask();