[PATCH 05/11] x86: cpu_emergency_vmxoff() function

Eduardo Habkost
2008-11-13T17:44:37Z

Add cpu_emergency_vmxoff() and its friends: cpu_vmx_enabled() and
__cpu_emergency_vmxoff().

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
arch/x86/include/asm/virtext.h | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
index 475fb17..2d090f3 100644
--- a/arch/x86/include/asm/virtext.h
+++ b/arch/x86/include/asm/virtext.h
@@ -58,4 +58,27 @@ static inline void cpu_vmxoff(void)
write_cr4(read_cr4() & ~X86_CR4_VMXE);
}

+static inline int cpu_vmx_enabled(void)
+{
+ return read_cr4() & X86_CR4_VMXE;
+}
+
+/** Disable VMX if it is enabled on the current CPU
+ *
+ * You shouldn't call this if cpu_has_vmx() returns 0.
+ */
+static inline void __cpu_emergency_vmxoff(void)
+{
+ if (cpu_vmx_enabled())
+ cpu_vmxoff();
+}
+
+/** Disable VMX if it is supportd and enabled on the current CPU
+ */
+static inline void cpu_emergency_vmxoff(void)
+{
+ if (cpu_has_vmx())
+ __cpu_emergency_vmxoff();
+}
+
#endif /* _ASM_X86_VIRTEX_H */