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x86: cpu_emergency_vmxoff() function

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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>
This commit is contained in:
Eduardo Habkost 2008-11-17 19:03:19 -02:00 committed by Avi Kivity
parent 710ff4a855
commit 6aa07a0d77
1 changed files with 23 additions and 0 deletions
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23
arch/x86/include/asm/virtext.h
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@ -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 */