Messages in this thread Patch in this message | | | From | Eduardo Habkost <> | Subject | [PATCH 03/11] x86: asm/virtext.h: add cpu_vmxoff() inline function | Date | Thu, 13 Nov 2008 15:43:43 -0200 |
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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: Eduardo Habkost <ehabkost@redhat.com> --- arch/x86/include/asm/virtext.h | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h index 351fa23..475fb17 100644 --- a/arch/x86/include/asm/virtext.h +++ b/arch/x86/include/asm/virtext.h @@ -45,4 +45,17 @@ 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 */ -- 1.5.5.GIT
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