Re: [Xen-devel] [PATCH] NPT: temporarily retain page table mapping in do_recalc()

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-05-05 at 11:31 +0100, Jan Beulich wrote:
> Commit b3e024f3 ("x86/NPT: don't walk page tables when changing types
> on a range") neglected the fact that p2m_next_level() replaces the
> previous level's mapping with the new level's one, hence dereferencing
> a stale pointer the translation for which may no longer be available
> (timing dependent). Add a parameter to that function allowing the
> caller to request that the mapping be retained (the unmapping will be
> taken care of by the caller then).
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

FWIW: Reviewed-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

Ian.


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