diff options
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index ddc8a7e165df..18aefb4d0927 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -43,6 +43,16 @@ static u32 xstate_required_size(u64 xstate_bv) return ret; } +u64 kvm_supported_xcr0(void) +{ + u64 xcr0 = KVM_SUPPORTED_XCR0 & host_xcr0; + + if (!kvm_x86_ops->mpx_supported || !kvm_x86_ops->mpx_supported()) + xcr0 &= ~(XSTATE_BNDREGS | XSTATE_BNDCSR); + + return xcr0; +} + void kvm_update_cpuid(struct kvm_vcpu *vcpu) { struct kvm_cpuid_entry2 *best; @@ -73,7 +83,7 @@ void kvm_update_cpuid(struct kvm_vcpu *vcpu) } else { vcpu->arch.guest_supported_xcr0 = (best->eax | ((u64)best->edx << 32)) & - host_xcr0 & KVM_SUPPORTED_XCR0; + kvm_supported_xcr0(); vcpu->arch.guest_xstate_size = best->ebx = xstate_required_size(vcpu->arch.xcr0); } @@ -210,13 +220,6 @@ static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, entry->flags = 0; } -static bool supported_xcr0_bit(unsigned bit) -{ - u64 mask = ((u64)1 << bit); - - return mask & KVM_SUPPORTED_XCR0 & host_xcr0; -} - #define F(x) bit(X86_FEATURE_##x) static int __do_cpuid_ent_emulated(struct kvm_cpuid_entry2 *entry, @@ -439,16 +442,18 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, } case 0xd: { int idx, i; + u64 supported = kvm_supported_xcr0(); - entry->eax &= host_xcr0 & KVM_SUPPORTED_XCR0; - entry->edx &= (host_xcr0 & KVM_SUPPORTED_XCR0) >> 32; + entry->eax &= supported; + entry->edx &= supported >> 32; entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; for (idx = 1, i = 1; idx < 64; ++idx) { + u64 mask = ((u64)1 << idx); if (*nent >= maxnent) goto out; do_cpuid_1_ent(&entry[i], function, idx); - if (entry[i].eax == 0 || !supported_xcr0_bit(idx)) + if (entry[i].eax == 0 || !(supported & mask)) continue; entry[i].flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |