Re: [Xen-devel] [PATCH v3 16/16] xen/arm: arm64: Document Cortex-A57 erratum 834220

[Julien Grall <julien.grall@xxxxxxx>]

Hi Stefano,

On 22/06/16 11:08, Stefano Stabellini wrote:
> On Tue, 7 Jun 2016, Julien Grall wrote:
> > The ARM erratum applies to certain revisions of Cortex-A57. The
> > processor may report a Stage 2 translation fault as the result of
> > Stage 1 fault for load crossing a page boundary when there is a
> > permission fault or device memory fault at stage 1 and a translation
> > fault at Stage 2.
> >
> > So Xen needs to check that Stage 1 translation does not generate a fault
> > before handling the Stage 2 fault. If it is a Stage 1 translation fault,
> > return to the guest to let the processor injecting the correct fault.
>                            ^let the process inject (let somebody do something)
>
>
> > Only document it as this is already the behavior of the fault handlers.
> > Note that some optimization could be done to avoid unnecessary translation
> > fault. This is because HPFAR_EL2 is valid for more use case. For the moment,
> > the code is left unmodified.
> >
> > Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
> Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
I have another series coming up which require to implement a workaround 
for the erratum.
Given this is only documentation, I am planning to drop this patch from 
the series.
Regards,

--
Julien Grall

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