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5153723388
Clang resolves __builtin_constant_p() to false even if the expression is
constant in the end. The only purpose of that expression was to
differentiate a case where the following expression couldn't be checked
at compile-time, so we can just remove the check.
Clang handles the following two correctly. Turn it into BUG_ON if there
are any more problems with this.
Fixes: d6321d4933 ("KVM: x86: generalize guest_cpuid_has_ helpers")
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
169 lines
4.3 KiB
C
169 lines
4.3 KiB
C
#ifndef ARCH_X86_KVM_CPUID_H
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#define ARCH_X86_KVM_CPUID_H
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#include "x86.h"
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#include <asm/cpu.h>
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#include <asm/processor.h>
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int kvm_update_cpuid(struct kvm_vcpu *vcpu);
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bool kvm_mpx_supported(void);
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struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
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u32 function, u32 index);
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int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
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struct kvm_cpuid_entry2 __user *entries,
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unsigned int type);
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int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
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struct kvm_cpuid *cpuid,
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struct kvm_cpuid_entry __user *entries);
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int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
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struct kvm_cpuid2 *cpuid,
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struct kvm_cpuid_entry2 __user *entries);
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int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
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struct kvm_cpuid2 *cpuid,
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struct kvm_cpuid_entry2 __user *entries);
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bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
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u32 *ecx, u32 *edx, bool check_limit);
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int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
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static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.maxphyaddr;
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}
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struct cpuid_reg {
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u32 function;
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u32 index;
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int reg;
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};
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static const struct cpuid_reg reverse_cpuid[] = {
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[CPUID_1_EDX] = { 1, 0, CPUID_EDX},
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[CPUID_8000_0001_EDX] = {0x80000001, 0, CPUID_EDX},
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[CPUID_8086_0001_EDX] = {0x80860001, 0, CPUID_EDX},
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[CPUID_1_ECX] = { 1, 0, CPUID_ECX},
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[CPUID_C000_0001_EDX] = {0xc0000001, 0, CPUID_EDX},
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[CPUID_8000_0001_ECX] = {0xc0000001, 0, CPUID_ECX},
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[CPUID_7_0_EBX] = { 7, 0, CPUID_EBX},
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[CPUID_D_1_EAX] = { 0xd, 1, CPUID_EAX},
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[CPUID_F_0_EDX] = { 0xf, 0, CPUID_EDX},
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[CPUID_F_1_EDX] = { 0xf, 1, CPUID_EDX},
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[CPUID_8000_0008_EBX] = {0x80000008, 0, CPUID_EBX},
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[CPUID_6_EAX] = { 6, 0, CPUID_EAX},
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[CPUID_8000_000A_EDX] = {0x8000000a, 0, CPUID_EDX},
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[CPUID_7_ECX] = { 7, 0, CPUID_ECX},
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[CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX},
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};
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static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature)
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{
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unsigned x86_leaf = x86_feature / 32;
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BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid));
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BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0);
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return reverse_cpuid[x86_leaf];
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}
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static __always_inline int *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature)
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{
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struct kvm_cpuid_entry2 *entry;
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const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
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entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
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if (!entry)
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return NULL;
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switch (cpuid.reg) {
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case CPUID_EAX:
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return &entry->eax;
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case CPUID_EBX:
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return &entry->ebx;
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case CPUID_ECX:
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return &entry->ecx;
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case CPUID_EDX:
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return &entry->edx;
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default:
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BUILD_BUG();
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return NULL;
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}
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}
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static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_feature)
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{
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int *reg;
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if (x86_feature == X86_FEATURE_XSAVE &&
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!static_cpu_has(X86_FEATURE_XSAVE))
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return false;
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reg = guest_cpuid_get_register(vcpu, x86_feature);
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if (!reg)
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return false;
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return *reg & bit(x86_feature);
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}
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static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature)
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{
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int *reg;
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reg = guest_cpuid_get_register(vcpu, x86_feature);
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if (reg)
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*reg &= ~bit(x86_feature);
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}
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static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpuid_entry2 *best;
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best = kvm_find_cpuid_entry(vcpu, 0, 0);
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return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx;
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}
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static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpuid_entry2 *best;
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best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
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if (!best)
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return -1;
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return x86_family(best->eax);
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}
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static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpuid_entry2 *best;
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best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
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if (!best)
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return -1;
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return x86_model(best->eax);
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}
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static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpuid_entry2 *best;
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best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
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if (!best)
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return -1;
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return x86_stepping(best->eax);
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}
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static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
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}
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static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.msr_misc_features_enables &
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MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
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}
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#endif
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