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6210e37b EH |
1 | /* CPU virtualization extensions handling |
2 | * | |
3 | * This should carry the code for handling CPU virtualization extensions | |
4 | * that needs to live in the kernel core. | |
5 | * | |
6 | * Author: Eduardo Habkost <ehabkost@redhat.com> | |
7 | * | |
8 | * Copyright (C) 2008, Red Hat Inc. | |
9 | * | |
10 | * Contains code from KVM, Copyright (C) 2006 Qumranet, Inc. | |
11 | * | |
12 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
13 | * the COPYING file in the top-level directory. | |
14 | */ | |
15 | #ifndef _ASM_X86_VIRTEX_H | |
16 | #define _ASM_X86_VIRTEX_H | |
17 | ||
18 | #include <asm/processor.h> | |
19 | #include <asm/system.h> | |
20 | ||
1e993114 EH |
21 | #include <asm/vmx.h> |
22 | ||
6210e37b EH |
23 | /* |
24 | * VMX functions: | |
25 | */ | |
26 | ||
27 | static inline int cpu_has_vmx(void) | |
28 | { | |
29 | unsigned long ecx = cpuid_ecx(1); | |
30 | return test_bit(5, &ecx); /* CPUID.1:ECX.VMX[bit 5] -> VT */ | |
31 | } | |
32 | ||
1e993114 EH |
33 | |
34 | /** Disable VMX on the current CPU | |
35 | * | |
36 | * vmxoff causes a undefined-opcode exception if vmxon was not run | |
37 | * on the CPU previously. Only call this function if you know VMX | |
38 | * is enabled. | |
39 | */ | |
40 | static inline void cpu_vmxoff(void) | |
41 | { | |
42 | asm volatile (ASM_VMX_VMXOFF : : : "cc"); | |
43 | write_cr4(read_cr4() & ~X86_CR4_VMXE); | |
44 | } | |
45 | ||
6aa07a0d EH |
46 | static inline int cpu_vmx_enabled(void) |
47 | { | |
48 | return read_cr4() & X86_CR4_VMXE; | |
49 | } | |
50 | ||
51 | /** Disable VMX if it is enabled on the current CPU | |
52 | * | |
53 | * You shouldn't call this if cpu_has_vmx() returns 0. | |
54 | */ | |
55 | static inline void __cpu_emergency_vmxoff(void) | |
56 | { | |
57 | if (cpu_vmx_enabled()) | |
58 | cpu_vmxoff(); | |
59 | } | |
60 | ||
61 | /** Disable VMX if it is supported and enabled on the current CPU | |
62 | */ | |
63 | static inline void cpu_emergency_vmxoff(void) | |
64 | { | |
65 | if (cpu_has_vmx()) | |
66 | __cpu_emergency_vmxoff(); | |
67 | } | |
68 | ||
6210e37b | 69 | #endif /* _ASM_X86_VIRTEX_H */ |