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KVM: MMU: mark page table dirty when a pte is actually modified

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Sometime cmpxchg_gpte doesn't modify gpte, in such case, don't mark
page table page as dirty.

Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gui Jianfeng 2010-05-05 09:09:21 +08:00 committed by Avi Kivity
parent eec4b140c9
commit f3b8c964a9
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/paging_tmpl.h
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@ -177,10 +177,10 @@ walk:
if (!(pte & PT_ACCESSED_MASK)) {
trace_kvm_mmu_set_accessed_bit(table_gfn, index,
sizeof(pte));
mark_page_dirty(vcpu->kvm, table_gfn);
if (FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn,
index, pte, pte|PT_ACCESSED_MASK))
goto walk;
mark_page_dirty(vcpu->kvm, table_gfn);
pte |= PT_ACCESSED_MASK;
}
@ -217,11 +217,11 @@ walk:
bool ret;
trace_kvm_mmu_set_dirty_bit(table_gfn, index, sizeof(pte));
mark_page_dirty(vcpu->kvm, table_gfn);
ret = FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn, index, pte,
pte|PT_DIRTY_MASK);
if (ret)
goto walk;
mark_page_dirty(vcpu->kvm, table_gfn);
pte |= PT_DIRTY_MASK;
walker->ptes[walker->level - 1] = pte;
}