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- /* 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/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 */
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