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KVM: x86: MMU: Simplify force_pt_level calculation code in FNAME(page_fault)()

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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>
This commit is contained in:
Takuya Yoshikawa 2015-10-16 17:05:13 +09:00 committed by Paolo Bonzini
parent cd1872f028
commit 5ed5c5c8fd
1 changed files with 7 additions and 8 deletions
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15
arch/x86/kvm/paging_tmpl.h
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@ -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();