KVM: nVMX: Implement VMPTRST

This patch implements the VMPTRST instruction.

Signed-off-by: Nadav Har'El <nyh@il.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 6f15053..256da82 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -85,4 +85,8 @@
 	gva_t addr, void *val, unsigned int bytes,
 	struct x86_exception *exception);
 
+int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,
+	gva_t addr, void *val, unsigned int bytes,
+	struct x86_exception *exception);
+
 #endif