---

yaml --- r: 125233 b: refs/heads/master c: 1e99311 h: refs/heads/master i: 125231: 6adb81c v: v3
git-mirror · Dec 31, 2008 · 4e4b98e · 4e4b98e
1 parent d864601
commit 4e4b98e
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Showing 2 changed files with 16 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6210e37b122583643da335c0389f74098713e5ca
+refs/heads/master: 1e9931146c748420343aeefadb3bb17bd1c14a37
diff --git a/trunk/arch/x86/include/asm/virtext.h b/trunk/arch/x86/include/asm/virtext.h
@@ -18,6 +18,8 @@
 #include <asm/processor.h>
 #include <asm/system.h>
 
+#include <asm/vmx.h>
+
 /*
  * VMX functions:
  */
@@ -28,4 +30,17 @@ static inline int cpu_has_vmx(void)
 	return test_bit(5, &ecx); /* CPUID.1:ECX.VMX[bit 5] -> VT */
 }
 
+
+/** Disable VMX on the current CPU
+ *
+ * vmxoff causes a undefined-opcode exception if vmxon was not run
+ * on the CPU previously. Only call this function if you know VMX
+ * is enabled.
+ */
+static inline void cpu_vmxoff(void)
+{
+	asm volatile (ASM_VMX_VMXOFF : : : "cc");
+	write_cr4(read_cr4() & ~X86_CR4_VMXE);
+}
+
 #endif /* _ASM_X86_VIRTEX_H */