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| author | Xiao Guangrong <guangrong.xiao@linux.intel.com> | 2016-02-24 10:51:11 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-03-03 14:36:21 +0100 |
| commit | 3d0c27ad6ee465f174b09ee99fcaf189c57d567a (patch) | |
| tree | e342d0a67b9b7fbc4e124aaa85f873b017a9edb8 /arch/x86/kvm/paging_tmpl.h | |
| parent | KVM: page track: introduce kvm_slot_page_track_{add,remove}_page (diff) | |
| download | linux-3d0c27ad6ee465f174b09ee99fcaf189c57d567a.tar.xz linux-3d0c27ad6ee465f174b09ee99fcaf189c57d567a.zip | |
KVM: MMU: let page fault handler be aware tracked page
The page fault caused by write access on the write tracked page can not
be fixed, it always need to be emulated. page_fault_handle_page_track()
is the fast path we introduce here to skip holding mmu-lock and shadow
page table walking
However, if the page table is not present, it is worth making the page
table entry present and readonly to make the read access happy
mmu_need_write_protect() need to be cooked to avoid page becoming writable
when making page table present or sync/prefetch shadow page table entries
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/paging_tmpl.h')
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 05827ff7bd2e..52ae2d94cc9e 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -728,6 +728,9 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code, return 0; } + if (page_fault_handle_page_track(vcpu, error_code, walker.gfn)) + return 1; + vcpu->arch.write_fault_to_shadow_pgtable = false; is_self_change_mapping = FNAME(is_self_change_mapping)(vcpu, |