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KVM: MMU: simplify mmu_need_write_protect

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Now, all non-leaf shadow page are page tracked, if gfn is not tracked
there is no non-leaf shadow page of gfn is existed, we can directly
make the shadow page of gfn to unsync

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiao Guangrong 2016-02-24 17:51:15 +08:00 committed by Paolo Bonzini
parent 56ca57f9fe
commit 5c520e90af
1 changed files with 7 additions and 22 deletions
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29
arch/x86/kvm/mmu.c
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@ -2444,7 +2444,7 @@ int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
}
EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page);
static void __kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
static void kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
{
trace_kvm_mmu_unsync_page(sp);
++vcpu->kvm->stat.mmu_unsync;
@ -2453,39 +2453,24 @@ static void __kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
kvm_mmu_mark_parents_unsync(sp);
}
static void kvm_unsync_pages(struct kvm_vcpu *vcpu, gfn_t gfn)
{
struct kvm_mmu_page *s;
for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn) {
if (s->unsync)
continue;
WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL);
__kvm_unsync_page(vcpu, s);
}
}
static bool mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn,
bool can_unsync)
{
struct kvm_mmu_page *s;
bool need_unsync = false;
struct kvm_mmu_page *sp;
if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_WRITE))
return true;
for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn) {
for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn) {
if (!can_unsync)
return true;
if (s->role.level != PT_PAGE_TABLE_LEVEL)
return true;
if (sp->unsync)
continue;
if (!s->unsync)
need_unsync = true;
WARN_ON(sp->role.level != PT_PAGE_TABLE_LEVEL);
kvm_unsync_page(vcpu, sp);
}
if (need_unsync)
kvm_unsync_pages(vcpu, gfn);
return false;
}