Re: [Xen-devel] SMMU, Unhandled context fault

[Julien Grall <julien.grall@xxxxxxx>]

Hello Peng,

On 27/04/2016 03:02, Peng Fan wrote:
> On Tue, Apr 26, 2016 at 04:30:03PM +0200, Edgar E. Iglesias wrote:
> > On Tue, Apr 26, 2016 at 09:56:33PM +0800, Peng Fan wrote:
> > > You mean the PNU bit(Privileged Not Unprivileged) is 1?
> > > I did not met Unhandled context fault each time.
> > > Actually during my serveral boot test, I only met two times.
> >
> >
> > I meant the NSSTATE and NSATTR bits in FSYNR are set to zero. I get the
> > impression that the TrustZone state for the SD controller may be
> oh. The NSATTR bit is 0. I did not find NSSTATE in my Issue D SMMU spec.
> If without xen, only one linux boots up, sd controller can access memory using
> DMA without issue.
IIRC, by default Linux baremetal does not protect the devices with the SMMU.

I would recommend you to check whether the SMMUs are in-used and 
configured to generate a fault (disable_bypass = 1).
Regards,

--
Julien Grall

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