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    Subject[PATCH 26/44] x86: cpu_emergency_svm_disable() function
    Date
    From: Eduardo Habkost <ehabkost@redhat.com>

    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>
    Signed-off-by: Avi Kivity <avi@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 2cfe363..5936362 100644
    --- a/arch/x86/include/asm/virtext.h
    +++ b/arch/x86/include/asm/virtext.h
    @@ -121,4 +121,12 @@ 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 */
    --
    1.6.0.3


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