diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/pkru.h | 17 | ||||
| -rw-r--r-- | arch/x86/include/asm/special_insns.h | 14 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 4 |
3 files changed, 7 insertions, 28 deletions
diff --git a/arch/x86/include/asm/pkru.h b/arch/x86/include/asm/pkru.h index 7e4550911c51..ccc539faa5bb 100644 --- a/arch/x86/include/asm/pkru.h +++ b/arch/x86/include/asm/pkru.h @@ -41,23 +41,14 @@ static inline u32 read_pkru(void) static inline void write_pkru(u32 pkru) { - struct pkru_state *pk; - if (!cpu_feature_enabled(X86_FEATURE_OSPKE)) return; - - pk = get_xsave_addr(¤t->thread.fpu.state.xsave, XFEATURE_PKRU); - /* - * The PKRU value in xstate needs to be in sync with the value that is - * written to the CPU. The FPU restore on return to userland would - * otherwise load the previous value again. + * WRPKRU is relatively expensive compared to RDPKRU. + * Avoid WRPKRU when it would not change the value. */ - fpregs_lock(); - if (pk) - pk->pkru = pkru; - __write_pkru(pkru); - fpregs_unlock(); + if (pkru != rdpkru()) + wrpkru(pkru); } static inline void pkru_write_default(void) diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h index 2acd6cb62328..f3fbb84ff8a7 100644 --- a/arch/x86/include/asm/special_insns.h +++ b/arch/x86/include/asm/special_insns.h @@ -104,25 +104,13 @@ static inline void wrpkru(u32 pkru) : : "a" (pkru), "c"(ecx), "d"(edx)); } -static inline void __write_pkru(u32 pkru) -{ - /* - * WRPKRU is relatively expensive compared to RDPKRU. - * Avoid WRPKRU when it would not change the value. - */ - if (pkru == rdpkru()) - return; - - wrpkru(pkru); -} - #else static inline u32 rdpkru(void) { return 0; } -static inline void __write_pkru(u32 pkru) +static inline void wrpkru(u32 pkru) { } #endif diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 07f788872ddf..8ee7add0e763 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -943,7 +943,7 @@ void kvm_load_guest_xsave_state(struct kvm_vcpu *vcpu) (kvm_read_cr4_bits(vcpu, X86_CR4_PKE) || (vcpu->arch.xcr0 & XFEATURE_MASK_PKRU)) && vcpu->arch.pkru != vcpu->arch.host_pkru) - __write_pkru(vcpu->arch.pkru); + write_pkru(vcpu->arch.pkru); } EXPORT_SYMBOL_GPL(kvm_load_guest_xsave_state); @@ -957,7 +957,7 @@ void kvm_load_host_xsave_state(struct kvm_vcpu *vcpu) (vcpu->arch.xcr0 & XFEATURE_MASK_PKRU))) { vcpu->arch.pkru = rdpkru(); if (vcpu->arch.pkru != vcpu->arch.host_pkru) - __write_pkru(vcpu->arch.host_pkru); + write_pkru(vcpu->arch.host_pkru); } if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) { |