From: Xiao Guangrong Date: Tue, 17 Jul 2012 13:52:52 +0000 (+0800) Subject: KVM: MMU: track the refcount when unmap the page X-Git-Tag: upstream/snapshot3+hdmi~6533^2~101^2~15 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=86fde74cf5b829627b37ca86322acfdd99b524b8;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git KVM: MMU: track the refcount when unmap the page It will trigger a WARN_ON if the page has been freed but it is still used in mmu, it can help us to detect mm bug early Signed-off-by: Xiao Guangrong Signed-off-by: Marcelo Tosatti --- diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index a5d6ef7..685a485 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -556,6 +556,14 @@ static int mmu_spte_clear_track_bits(u64 *sptep) return 0; pfn = spte_to_pfn(old_spte); + + /* + * KVM does not hold the refcount of the page used by + * kvm mmu, before reclaiming the page, we should + * unmap it from mmu first. + */ + WARN_ON(!kvm_is_mmio_pfn(pfn) && !page_count(pfn_to_page(pfn))); + if (!shadow_accessed_mask || old_spte & shadow_accessed_mask) kvm_set_pfn_accessed(pfn); if (!shadow_dirty_mask || (old_spte & shadow_dirty_mask))