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| author | Eduardo Habkost <ehabkost@redhat.com> | 2008-11-18 00:03:19 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2008-12-31 17:52:29 +0300 |
| commit | 6aa07a0d77f6aafbe69e4e8609ffaf2b7ee1b591 (patch) | |
| tree | 02b6a3a17840804fd3331e1920cdb671a63f4169 /arch/x86/include/asm/virtext.h | |
| parent | 710ff4a855d0f3bf74b5b4a20328e2858a8a2968 (diff) | |
| download | linux-6aa07a0d77f6aafbe69e4e8609ffaf2b7ee1b591.tar.xz | |
x86: cpu_emergency_vmxoff() function
Add cpu_emergency_vmxoff() and its friends: cpu_vmx_enabled() and
__cpu_emergency_vmxoff().
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/virtext.h')
| -rw-r--r-- | 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 7dee5b59930e..6bcf0acb4ef1 100644 --- a/arch/x86/include/asm/virtext.h +++ b/arch/x86/include/asm/virtext.h @@ -43,4 +43,27 @@ 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 supported 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 */ |