[PATCH 09/11] x86: asm/virtext.h: create cpu_emergency_svm_disable()

Eduardo Habkost
2008-11-13T17:44:35Z

This function can be used by the reboot or kdump code to forcibly
disable SVM on the CPU.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
arch/x86/include/asm/virtext.h | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
index 7281e10..e4f6bb0 100644
--- a/arch/x86/include/asm/virtext.h
+++ b/arch/x86/include/asm/virtext.h
@@ -142,4 +142,12 @@ static inline void cpu_svm_disable(void)
wrmsrl(MSR_EFER, efer & ~MSR_EFER_SVME_MASK);
}

+/** Makes sure SVM is disabled, if it is supported on the CPU
+ */
+static inline void cpu_emergency_svm_disable(void)
+{
+ if (cpu_has_svm(NULL))
+ cpu_svm_disable();
+}
+
#endif /* _ASM_X86_VIRTEX_H */