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| author | Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> | 2015-10-16 11:05:13 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-10-16 11:34:00 +0300 |
| commit | 5ed5c5c8fdbab889837c9223fc6f4bdaa830879c (patch) | |
| tree | ef7494fb2803fb26097d8fd5d7f28029bb2c86e2 /arch/x86/kvm | |
| parent | cd1872f028556dc0e8424e58413c0268c159383b (diff) | |
| download | linux-5ed5c5c8fdbab889837c9223fc6f4bdaa830879c.tar.xz | |
KVM: x86: MMU: Simplify force_pt_level calculation code in FNAME(page_fault)()
As a bonus, an extra memory slot search can be eliminated when
is_self_change_mapping is true.
Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 07f1a4ede637..8ebc3a5560ce 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -743,15 +743,14 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code, is_self_change_mapping = FNAME(is_self_change_mapping)(vcpu, &walker, user_fault, &vcpu->arch.write_fault_to_shadow_pgtable); - if (walker.level >= PT_DIRECTORY_LEVEL) - force_pt_level = mapping_level_dirty_bitmap(vcpu, walker.gfn) - || is_self_change_mapping; - else + if (walker.level >= PT_DIRECTORY_LEVEL && !is_self_change_mapping) { + force_pt_level = mapping_level_dirty_bitmap(vcpu, walker.gfn); + if (!force_pt_level) { + level = min(walker.level, mapping_level(vcpu, walker.gfn)); + walker.gfn = walker.gfn & ~(KVM_PAGES_PER_HPAGE(level) - 1); + } + } else force_pt_level = true; - if (!force_pt_level) { - level = min(walker.level, mapping_level(vcpu, walker.gfn)); - walker.gfn = walker.gfn & ~(KVM_PAGES_PER_HPAGE(level) - 1); - } mmu_seq = vcpu->kvm->mmu_notifier_seq; smp_rmb(); |