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KVM: MMU: Fix potential memory leak with smp real-mode
When we map a page, we check whether some other vcpu mapped it for us and if so, bail out. But we should decrease the refcount on the page as we do so. Signed-off-by: Izik Eidus <izike@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
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@ -907,8 +907,10 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, hpa_t p)
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pte = table[index];
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was_rmapped = is_rmap_pte(pte);
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if (is_shadow_present_pte(pte) && is_writeble_pte(pte))
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if (is_shadow_present_pte(pte) && is_writeble_pte(pte)) {
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kvm_release_page(pfn_to_page(p >> PAGE_SHIFT));
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return 0;
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}
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mark_page_dirty(vcpu->kvm, v >> PAGE_SHIFT);
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page_header_update_slot(vcpu->kvm, table, v);
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table[index] = p | PT_PRESENT_MASK | PT_WRITABLE_MASK |
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