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Commit 1e993114 authored by Eduardo Habkost's avatar Eduardo Habkost Committed by Avi Kivity
Browse files

x86: asm/virtext.h: add cpu_vmxoff() inline function 



Unfortunately we can't use exactly the same code from vmx
hardware_disable(), because the KVM function uses the
__kvm_handle_fault_on_reboot() tricks.

Signed-off-by: default avatarEduardo Habkost <ehabkost@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 6210e37b

arch/x86/include/asm/virtext.h

+15 −0
Original line number Diff line number Diff line
@@ -18,6 +18,8 @@ 
#include <asm/processor.h>

#include <asm/system.h>



#include <asm/vmx.h>



/*

 * VMX functions:

 */
@@ -28,4 +30,17 @@ static inline int cpu_has_vmx(void) 
	return test_bit(5, &ecx); /* CPUID.1:ECX.VMX[bit 5] -> VT */

}





/** Disable VMX on the current CPU

 *

 * vmxoff causes a undefined-opcode exception if vmxon was not run

 * on the CPU previously. Only call this function if you know VMX

 * is enabled.

 */

static inline void cpu_vmxoff(void)

{

	asm volatile (ASM_VMX_VMXOFF : : : "cc");

	write_cr4(read_cr4() & ~X86_CR4_VMXE);

}



#endif /* _ASM_X86_VIRTEX_H */