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

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).


Julien Grall

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