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| author | Gui Jianfeng <guijianfeng@cn.fujitsu.com> | 2010-04-16 17:16:40 +0800 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-05-17 12:18:06 +0300 |
| commit | 51fb60d81b483ae75614d401e7d4271884894113 (patch) | |
| tree | 2f5ef2c53ee0f3342bd42c3c72193d8cd3f824c3 /arch/x86 | |
| parent | 66cbff59a16017234ea6c80ecddfc17b27a83504 (diff) | |
| download | blackbird-op-linux-51fb60d81b483ae75614d401e7d4271884894113.tar.gz blackbird-op-linux-51fb60d81b483ae75614d401e7d4271884894113.zip | |
KVM: MMU: Move sync_page() first pte address calculation out of loop
Move first pte address calculation out of loop to save some cycles.
Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index d9dea288e51d..5910557b3f33 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -572,12 +572,15 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) { int i, offset, nr_present; bool reset_host_protection; + gpa_t first_pte_gpa; offset = nr_present = 0; if (PTTYPE == 32) offset = sp->role.quadrant << PT64_LEVEL_BITS; + first_pte_gpa = gfn_to_gpa(sp->gfn) + offset * sizeof(pt_element_t); + for (i = 0; i < PT64_ENT_PER_PAGE; i++) { unsigned pte_access; pt_element_t gpte; @@ -587,8 +590,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) if (!is_shadow_present_pte(sp->spt[i])) continue; - pte_gpa = gfn_to_gpa(sp->gfn); - pte_gpa += (i+offset) * sizeof(pt_element_t); + pte_gpa = first_pte_gpa + i * sizeof(pt_element_t); if (kvm_read_guest_atomic(vcpu->kvm, pte_gpa, &gpte, sizeof(pt_element_t))) |
