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Diffstat (limited to 'arch/x86/include/asm/virtext.h')
-rw-r--r-- | arch/x86/include/asm/virtext.h | 132 |
1 files changed, 0 insertions, 132 deletions
diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h deleted file mode 100644 index e0f9aa16358b..000000000000 --- a/arch/x86/include/asm/virtext.h +++ /dev/null @@ -1,132 +0,0 @@ -/* CPU virtualization extensions handling - * - * This should carry the code for handling CPU virtualization extensions - * that needs to live in the kernel core. - * - * Author: Eduardo Habkost <ehabkost@redhat.com> - * - * Copyright (C) 2008, Red Hat Inc. - * - * Contains code from KVM, Copyright (C) 2006 Qumranet, Inc. - * - * This work is licensed under the terms of the GNU GPL, version 2. See - * the COPYING file in the top-level directory. - */ -#ifndef _ASM_X86_VIRTEX_H -#define _ASM_X86_VIRTEX_H - -#include <asm/processor.h> -#include <asm/system.h> - -#include <asm/vmx.h> -#include <asm/svm.h> - -/* - * VMX functions: - */ - -static inline int cpu_has_vmx(void) -{ - unsigned long ecx = cpuid_ecx(1); - 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); -} - -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(); -} - - - - -/* - * SVM functions: - */ - -/** Check if the CPU has SVM support - * - * You can use the 'msg' arg to get a message describing the problem, - * if the function returns zero. Simply pass NULL if you are not interested - * on the messages; gcc should take care of not generating code for - * the messages on this case. - */ -static inline int cpu_has_svm(const char **msg) -{ - uint32_t eax, ebx, ecx, edx; - - if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) { - if (msg) - *msg = "not amd"; - return 0; - } - - cpuid(0x80000000, &eax, &ebx, &ecx, &edx); - if (eax < SVM_CPUID_FUNC) { - if (msg) - *msg = "can't execute cpuid_8000000a"; - return 0; - } - - cpuid(0x80000001, &eax, &ebx, &ecx, &edx); - if (!(ecx & (1 << SVM_CPUID_FEATURE_SHIFT))) { - if (msg) - *msg = "svm not available"; - return 0; - } - return 1; -} - - -/** Disable SVM on the current CPU - * - * You should call this only if cpu_has_svm() returned true. - */ -static inline void cpu_svm_disable(void) -{ - uint64_t efer; - - wrmsrl(MSR_VM_HSAVE_PA, 0); - rdmsrl(MSR_EFER, efer); - wrmsrl(MSR_EFER, efer & ~EFER_SVME); -} - -/** Makes sure SVM is disabled, if it is supported on the CPU - */ -static inline void cpu_emergency_svm_disable(void) -{ - if (cpu_has_svm(NULL)) - cpu_svm_disable(); -} - -#endif /* _ASM_X86_VIRTEX_H */ |