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SubjectRe: [PATCH v2 03/12] KVM: MMU: simplify mmu_set_spte
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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