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/* SPDX-License-Identifier: GPL-2.0-only */ /* 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. */ #ifndef _ASM_X86_VIRTEX_H #define _ASM_X86_VIRTEX_H #include <asm/processor.h> #include <asm/vmx.h> #include <asm/svm.h> #include <asm/tlbflush.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 */ } /** * cpu_vmxoff() - Disable VMX on the current CPU * * Disable VMX and clear CR4.VMXE (even if VMXOFF faults) * * Note, VMXOFF causes a #UD if the CPU is !post-VMXON, but it's impossible to * atomically track post-VMXON state, e.g. this may be called in NMI context. * Eat all faults as all other faults on VMXOFF faults are mode related, i.e. * faults are guaranteed to be due to the !post-VMXON check unless the CPU is * magically in RM, VM86, compat mode, or at CPL>0. */ static inline void cpu_vmxoff(void) { asm_volatile_goto("1: vmxoff\n\t" _ASM_EXTABLE(1b, %l[fault]) :::: fault); fault: cr4_clear_bits(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) { if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD && boot_cpu_data.x86_vendor != X86_VENDOR_HYGON) { if (msg) *msg = "not amd or hygon"; return 0; } if (!boot_cpu_has(X86_FEATURE_SVM)) { 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); if (efer & EFER_SVME) { /* * Force GIF=1 prior to disabling SVM to ensure INIT and NMI * aren't blocked, e.g. if a fatal error occurred between CLGI * and STGI. Note, STGI may #UD if SVM is disabled from NMI * context between reading EFER and executing STGI. In that * case, GIF must already be set, otherwise the NMI would have * been blocked, so just eat the fault. */ asm_volatile_goto("1: stgi\n\t" _ASM_EXTABLE(1b, %l[fault]) ::: "memory" : fault); fault: 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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