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| author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2011-07-11 19:23:20 (GMT) |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-07-24 08:50:26 (GMT) |
| commit | bebb106a5afa32efdf5332ed4a40bf4d6d06b56e (patch) | |
| tree | b8da141e846c9d25fbe4c69b12582cada03726e3 /arch/x86/kvm/mmu.h | |
| parent | af7cc7d1ee422a612f6785e347a893d44cc892ea (diff) | |
| download | linux-bebb106a5afa32efdf5332ed4a40bf4d6d06b56e.tar.xz | |
KVM: MMU: cache mmio info on page fault path
If the page fault is caused by mmio, we can cache the mmio info, later, we do
not need to walk guest page table and quickly know it is a mmio fault while we
emulate the mmio instruction
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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 7086ca8..05310b1 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 |