text: /* SPDX-License-Identifier: GPL-2.0 */
  #ifndef ARCH_X86_KVM_CPUID_H
  #define ARCH_X86_KVM_CPUID_H
  
  #include "x86.h"
  #include <asm/cpu.h>
  #include <asm/processor.h>
  
  int kvm_update_cpuid(struct kvm_vcpu *vcpu);
  bool kvm_mpx_supported(void);
  struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
  					      u32 function, u32 index);
  int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
  			    struct kvm_cpuid_entry2 __user *entries,
  			    unsigned int type);
  int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
  			     struct kvm_cpuid *cpuid,
  			     struct kvm_cpuid_entry __user *entries);
  int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
  			      struct kvm_cpuid2 *cpuid,
  			      struct kvm_cpuid_entry2 __user *entries);
  int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
  			      struct kvm_cpuid2 *cpuid,
  			      struct kvm_cpuid_entry2 __user *entries);
  bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
  	       u32 *ecx, u32 *edx, bool check_limit);
  
  int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
  
  static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
  {
  	return vcpu->arch.maxphyaddr;
  }
  
  struct cpuid_reg {
  	u32 function;
  	u32 index;
  	int reg;
  };
  
  static const struct cpuid_reg reverse_cpuid[] = {
  	[CPUID_1_EDX]         = {         1, 0, CPUID_EDX},
  	[CPUID_8000_0001_EDX] = {0x80000001, 0, CPUID_EDX},
  	[CPUID_8086_0001_EDX] = {0x80860001, 0, CPUID_EDX},
  	[CPUID_1_ECX]         = {         1, 0, CPUID_ECX},
  	[CPUID_C000_0001_EDX] = {0xc0000001, 0, CPUID_EDX},
  	[CPUID_8000_0001_ECX] = {0xc0000001, 0, CPUID_ECX},
  	[CPUID_7_0_EBX]       = {         7, 0, CPUID_EBX},
  	[CPUID_D_1_EAX]       = {       0xd, 1, CPUID_EAX},
  	[CPUID_F_0_EDX]       = {       0xf, 0, CPUID_EDX},
  	[CPUID_F_1_EDX]       = {       0xf, 1, CPUID_EDX},
  	[CPUID_8000_0008_EBX] = {0x80000008, 0, CPUID_EBX},
  	[CPUID_6_EAX]         = {         6, 0, CPUID_EAX},
  	[CPUID_8000_000A_EDX] = {0x8000000a, 0, CPUID_EDX},
  	[CPUID_7_ECX]         = {         7, 0, CPUID_ECX},
  	[CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX},
  };
  
  static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature)
  {
  	unsigned x86_leaf = x86_feature / 32;
  
  	BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid));
  	BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0);
  
  	return reverse_cpuid[x86_leaf];
  }
  
  static __always_inline int *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature)
  {
  	struct kvm_cpuid_entry2 *entry;
  	const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
  
  	entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
  	if (!entry)
  		return NULL;
  
  	switch (cpuid.reg) {
  	case CPUID_EAX:
  		return &entry->eax;
  	case CPUID_EBX:
  		return &entry->ebx;
  	case CPUID_ECX:
  		return &entry->ecx;
  	case CPUID_EDX:
  		return &entry->edx;
  	default:
  		BUILD_BUG();
  		return NULL;
  	}
  }
  
  static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_feature)
  {
  	int *reg;
  
  	if (x86_feature == X86_FEATURE_XSAVE &&
  			!static_cpu_has(X86_FEATURE_XSAVE))
  		return false;
  
  	reg = guest_cpuid_get_register(vcpu, x86_feature);
  	if (!reg)
  		return false;
  
  	return *reg & bit(x86_feature);
  }
  
  static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature)
  {
  	int *reg;
  
  	reg = guest_cpuid_get_register(vcpu, x86_feature);
  	if (reg)
  		*reg &= ~bit(x86_feature);
  }
  
  static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu)
  {
  	struct kvm_cpuid_entry2 *best;
  
  	best = kvm_find_cpuid_entry(vcpu, 0, 0);
  	return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx;
  }
  
  static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
  {
  	struct kvm_cpuid_entry2 *best;
  
  	best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
  	if (!best)
  		return -1;
  
  	return x86_family(best->eax);
  }
  
  static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
  {
  	struct kvm_cpuid_entry2 *best;
  
  	best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
  	if (!best)
  		return -1;
  
  	return x86_model(best->eax);
  }
  
  static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
  {
  	struct kvm_cpuid_entry2 *best;
  
  	best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
  	if (!best)
  		return -1;
  
  	return x86_stepping(best->eax);
  }
  
  static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
  {
  	return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
  }
  
  static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
  {
  	return vcpu->arch.msr_misc_features_enables &
  		  MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
  }
  
  #endif
  