diff options
Diffstat (limited to 'arch/x86/kvm/mmu.h')
| -rw-r--r-- | arch/x86/kvm/mmu.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h index 7086ca85d3e..05310b105da 100644 --- a/arch/x86/kvm/mmu.h +++ b/arch/x86/kvm/mmu.h @@ -76,4 +76,27 @@ static inline int is_present_gpte(unsigned long pte) return pte & PT_PRESENT_MASK; } +static inline int is_writable_pte(unsigned long pte) +{ + return pte & PT_WRITABLE_MASK; +} + +static inline bool is_write_protection(struct kvm_vcpu *vcpu) +{ + return kvm_read_cr0_bits(vcpu, X86_CR0_WP); +} + +static inline bool check_write_user_access(struct kvm_vcpu *vcpu, + bool write_fault, bool user_fault, + unsigned long pte) +{ + if (unlikely(write_fault && !is_writable_pte(pte) + && (user_fault || is_write_protection(vcpu)))) + return false; + + if (unlikely(user_fault && !(pte & PT_USER_MASK))) + return false; + + return true; +} #endif |