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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/paging_tmpl.h | |
| parent | af7cc7d1ee422a612f6785e347a893d44cc892ea (diff) | |
| download | linux-fsl-qoriq-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/paging_tmpl.h')
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 1e1c244..f0fb1a4 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -208,11 +208,8 @@ retry_walk: goto error; } - if (unlikely(write_fault && !is_writable_pte(pte) - && (user_fault || is_write_protection(vcpu)))) - eperm = true; - - if (unlikely(user_fault && !(pte & PT_USER_MASK))) + if (!check_write_user_access(vcpu, write_fault, user_fault, + pte)) eperm = true; #if PTTYPE == 64 @@ -625,8 +622,16 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code, return 0; /* mmio */ - if (is_error_pfn(pfn)) - return kvm_handle_bad_page(vcpu->kvm, walker.gfn, pfn); + if (is_error_pfn(pfn)) { + unsigned access = walker.pte_access; + bool dirty = is_dirty_gpte(walker.ptes[walker.level - 1]); + + if (!dirty) + access &= ~ACC_WRITE_MASK; + + return kvm_handle_bad_page(vcpu, mmu_is_nested(vcpu) ? 0 : + addr, access, walker.gfn, pfn); + } spin_lock(&vcpu->kvm->mmu_lock); if (mmu_notifier_retry(vcpu, mmu_seq)) @@ -666,6 +671,8 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva) u64 *sptep; int need_flush = 0; + vcpu_clear_mmio_info(vcpu, gva); + spin_lock(&vcpu->kvm->mmu_lock); for_each_shadow_entry(vcpu, gva, iterator) { |