diff -r 47c05f13d036 -r c3afa05c3cb5 xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c	Tue Nov 30 13:49:59 2010 -0600
+++ b/xen/arch/x86/hvm/hvm.c	Thu Dec 02 11:08:21 2010 -0600
@@ -1144,6 +1144,31 @@
     return 0;
 }
 
+int hvm_handle_xsetbv(u64 new_bv)
+{
+    struct vcpu *v = current;
+    struct segment_register sreg;
+
+    hvm_get_segment_register(v, x86_seg_ss, &sreg);
+    if ( sreg.attr.fields.dpl != 0 )
+        goto err;
+
+    if ( ((new_bv ^ xfeature_mask) & ~xfeature_mask) || !(new_bv & 1) )
+        goto err;
+
+    if ( (xfeature_mask & XSTATE_YMM & new_bv) && !(new_bv & XSTATE_SSE) )
+        goto err;
+
+    v->arch.xcr0 = new_bv;
+    v->arch.xcr0_accum |= new_bv;
+    set_xcr0(new_bv);
+
+    return 0;
+err:
+    hvm_inject_exception(TRAP_gp_fault, 0, 0);
+    return -1;
+}
+
 int hvm_set_efer(uint64_t value)
 {
     struct vcpu *v = current;
diff -r 47c05f13d036 -r c3afa05c3cb5 xen/arch/x86/hvm/svm/emulate.c
--- a/xen/arch/x86/hvm/svm/emulate.c	Tue Nov 30 13:49:59 2010 -0600
+++ b/xen/arch/x86/hvm/svm/emulate.c	Thu Dec 02 11:08:21 2010 -0600
@@ -101,6 +101,7 @@
 MAKE_INSTR(INT3,   1, 0xcc);
 MAKE_INSTR(RDTSC,  2, 0x0f, 0x31);
 MAKE_INSTR(PAUSE,  1, 0x90);
+MAKE_INSTR(XSETBV, 3, 0x0f, 0x01, 0xd1);
 
 static const u8 *opc_bytes[INSTR_MAX_COUNT] = 
 {
@@ -114,6 +115,7 @@
     [INSTR_INT3]   = OPCODE_INT3,
     [INSTR_RDTSC]  = OPCODE_RDTSC,
     [INSTR_PAUSE]  = OPCODE_PAUSE,
+    [INSTR_XSETBV] = OPCODE_XSETBV,
 };
 
 static int fetch(struct vcpu *v, u8 *buf, unsigned long addr, int len)
diff -r 47c05f13d036 -r c3afa05c3cb5 xen/arch/x86/hvm/svm/svm.c
--- a/xen/arch/x86/hvm/svm/svm.c	Tue Nov 30 13:49:59 2010 -0600
+++ b/xen/arch/x86/hvm/svm/svm.c	Thu Dec 02 11:08:21 2010 -0600
@@ -1603,6 +1603,13 @@
         hvm_inject_exception(TRAP_invalid_op, HVM_DELIVER_NO_ERROR_CODE, 0);
         break;
 
+    case VMEXIT_XSETBV:
+        if ( (inst_len = __get_instruction_length(current, INSTR_XSETBV))==0 )
+            break;
+        if ( hvm_handle_xsetbv((((u64)regs->edx) << 32) | regs->eax) == 0 )
+            __update_guest_eip(regs, inst_len);
+        break;
+
     case VMEXIT_NPF:
         perfc_incra(svmexits, VMEXIT_NPF_PERFC);
         regs->error_code = vmcb->exitinfo1;
diff -r 47c05f13d036 -r c3afa05c3cb5 xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c	Tue Nov 30 13:49:59 2010 -0600
+++ b/xen/arch/x86/hvm/vmx/vmx.c	Thu Dec 02 11:08:21 2010 -0600
@@ -2197,30 +2197,6 @@
     return 0;
 }
 
-static int vmx_handle_xsetbv(u64 new_bv)
-{
-    struct vcpu *v = current;
-    struct segment_register sreg;
-
-    hvm_get_segment_register(v, x86_seg_ss, &sreg);
-    if ( sreg.attr.fields.dpl != 0 )
-        goto err;
-
-    if ( ((new_bv ^ xfeature_mask) & ~xfeature_mask) || !(new_bv & 1) )
-        goto err;
-
-    if ( (xfeature_mask & XSTATE_YMM & new_bv) && !(new_bv & XSTATE_SSE) )
-        goto err;
-
-    v->arch.xcr0 = new_bv;
-    v->arch.xcr0_accum |= new_bv;
-    set_xcr0(new_bv);
-    return 0;
-err:
-    vmx_inject_hw_exception(TRAP_gp_fault, 0);
-    return -1;
-}
-
 asmlinkage void vmx_vmexit_handler(struct cpu_user_regs *regs)
 {
     unsigned int exit_reason, idtv_info, intr_info = 0, vector = 0;
@@ -2613,7 +2589,7 @@
     case EXIT_REASON_XSETBV:
     {
         u64 new_bv = (((u64)regs->edx) << 32) | regs->eax;
-        if ( vmx_handle_xsetbv(new_bv) == 0 )
+        if ( hvm_handle_xsetbv(new_bv) == 0 )
             update_guest_eip(); /* Safe: XSETBV */
         break;
     }
diff -r 47c05f13d036 -r c3afa05c3cb5 xen/include/asm-x86/hvm/support.h
--- a/xen/include/asm-x86/hvm/support.h	Tue Nov 30 13:49:59 2010 -0600
+++ b/xen/include/asm-x86/hvm/support.h	Thu Dec 02 11:08:21 2010 -0600
@@ -128,6 +128,8 @@
 
 void hvm_rdtsc_intercept(struct cpu_user_regs *regs);
 
+int hvm_handle_xsetbv(u64 new_bv);
+
 /* These functions all return X86EMUL return codes. */
 int hvm_set_efer(uint64_t value);
 int hvm_set_cr0(unsigned long value);
diff -r 47c05f13d036 -r c3afa05c3cb5 xen/include/asm-x86/hvm/svm/emulate.h
--- a/xen/include/asm-x86/hvm/svm/emulate.h	Tue Nov 30 13:49:59 2010 -0600
+++ b/xen/include/asm-x86/hvm/svm/emulate.h	Thu Dec 02 11:08:21 2010 -0600
@@ -32,6 +32,7 @@
     INSTR_INT3,
     INSTR_RDTSC,
     INSTR_PAUSE,
+    INSTR_XSETBV,
     INSTR_MAX_COUNT /* Must be last - Number of instructions supported */
 };
 
diff -r 47c05f13d036 -r c3afa05c3cb5 xen/include/asm-x86/hvm/svm/vmcb.h
--- a/xen/include/asm-x86/hvm/svm/vmcb.h	Tue Nov 30 13:49:59 2010 -0600
+++ b/xen/include/asm-x86/hvm/svm/vmcb.h	Thu Dec 02 11:08:21 2010 -0600
@@ -299,6 +299,7 @@
     VMEXIT_MONITOR          = 138, /* 0x8a */
     VMEXIT_MWAIT            = 139, /* 0x8b */
     VMEXIT_MWAIT_CONDITIONAL= 140, /* 0x8c */
+    VMEXIT_XSETBV           = 141, /* 0x8d */
     VMEXIT_NPF              = 1024, /* 0x400, nested paging fault */
     VMEXIT_INVALID          =  -1
 };