Re: [Xen-devel] [PATCH V14 5/7] xen/arm: Instruction prefetch abort (X) mem_access event handling

[Tamas K Lengyel <tklengyel@xxxxxxxxxxxxx>]

On Mon, Mar 30, 2015 at 5:24 PM, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:

On Mon, 2015-03-30 at 17:14 +0200, Tamas K Lengyel wrote:

>Â Â Â Â ÂAccording to ARMv8 ARM HPFAR is valid for any of these:
>Â Â Â Â Â Â Â Â* A Translation or Access Flag fault on a stage 2 translation.
>Â Â Â Â Â Â Â Â* A stage 2 Address Size fault.
>Â Â Â Â Â Â Â Â* A fault on the stage 2 translation of an address accessed in a
>Â Â Â Â Â Â Â Â Âstage 1 translation table walk.
>
>Â Â Â Â ÂI think what you are (correctly) saying is that it omits "a permission
>Â Â Â Â Âfault on a stage 2 translation", which is one of the cases which can
>Â Â Â Â Âoccur under xenaccess. Which is shame :-(
>
> Hm, what I recall is that it is valid for permission faults as well,
> but only and exclusively during s1ptw.

Right, which is the third bullet I quoted. The issue I was referring to
was the lack of permission faults being mentioned in the first bullet (!
s1ptw case).

Ian.

Yeap, that's the core of the problem..

Tamas

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