Re: [Xen-devel] [PATCH v5 10/17] xen/arm: map_regions_rw_cache: Map the region with p2m->default_access

[Julien Grall <julien.grall@xxxxxxx>]

On 06/07/16 12:17, Stefano Stabellini wrote:
> On Wed, 6 Jul 2016, Julien Grall wrote:
> > (CC Tamas)
> >
> > On 06/07/16 11:43, Stefano Stabellini wrote:
> > > On Tue, 28 Jun 2016, Julien Grall wrote:
> > > > The parameter 'access' is used by memaccess to restrict temporarily the
> > > > permission. This parameter should not be used for other purpose (such
> > > > as restricting permanently the permission).
> > > >
> > > > The type p2m_mmio_direct will map the region Read-Write and
> > > > non-executable. Note that this is already the current behavior with the
> > > > combination of the type and the access. So there is no functional
> > > > change.
> > > >
> > > > Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
> > > I could be mistaken, but isn't default_access actually p2m_access_rwx?
> > By default, the access is p2m_access_rwx. However this can be changed by
> > memaccess and the new default value is stored in arch->p2m.default_access. I
> > have CCed Tamas to confirm that.
> >
> > Note that this is how the other calls are done.
> This patch replaces p2m_access_rw with default_access, which is
> p2m_access_rwx by default. Is it actually indended?
Yes, I explained why in the commit message.

"The type p2m_mmio_direct will map the region Read-Write and
non-executable. Note that this is already the current behavior with the
combination of the type and the access. So there is no functional
change."

Regards,

--
Julien Grall

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