Re: [Xen-devel] [PATCH] x86/HVM: Fixed the bug which cause the nested hvm guest fail to boot

["Jan Beulich" <jbeulich@xxxxxxxx>]

>>> Liliang <liangx.z.li@xxxxxxxxx> 08/18/14 1:15 PM >>>
>From: Li Liang <liangx.z.li@xxxxxxxxx>
>
>The function memory_type_changed should not be called in hvm_set_guest_pat.
>or the cache will be flushed excessively and make the nested guest very slowly,
>just like blocked.

As Andrew already said - blindly removing the call is wrong, it is there for a
reason. What you first of all need to explain is why there are so many PAT
modifications, as it's perhaps _that_ which needs adjustment (possibly e.g.
including some filtering to hide writes that don't change the actual value, if
that happens frequently).

Jan


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