--- ./arch/x86/xen/enlighten.c.orig
+++ ./arch/x86/xen/enlighten.c
@@ -805,6 +805,7 @@
 {
 	cr4 &= ~X86_CR4_PGE;
 	cr4 &= ~X86_CR4_PSE;
+	cr4 &= ~X86_CR4_OSXSAVE;
 
 	native_write_cr4(cr4);
 }