| Date | Mon, 28 Jan 2013 22:21:51 -0200 | From | Marcelo Tosatti <> | Subject | Re: [PATCH v2 03/12] KVM: MMU: simplify mmu_set_spte |
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On Wed, Jan 23, 2013 at 06:05:29PM +0800, Xiao Guangrong wrote: > In order to detecting spte remapping, we can simply check whether the > spte has already been pointing to the pfn even if the spte is not the > last spte, for middle spte is pointing to the kernel pfn which can not > be mapped to userspace
This check is detecting spte overwrite, when a large spte is replaced by pointer to spte table.
Can't see why check for different pfn is safe: only 'int level' can differ, and pfn be equivalent, for example.
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