Re: [Xen-devel] xen:arm boot failures after commit 1c92a2aa*

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Ian,

On 09/24/2014 03:16 PM, Ian Campbell wrote:
> On Wed, 2014-09-24 at 05:36 -0700, Suriyan Ramasami wrote:
> Thanks,
> 
>> (XEN)   VTCR_EL2: 80003518
> 
> THis has changed from 0x80003558 before this change (sorry, this was in
> your original report too and I failed to spot it).
> 
> The missing bit changes the starting level of the PT from L1 to L2,
> which ain't gonna work very well ;-).
> 
> I can't for the life of me figure out how/why this works on arndale, but
> it does...

It also works on Midway (without the patch below). I guess it depends on
the position of the RAM in the p2m.

> Anyway, does this fix it for you?
> 
> 8<------------------
> 
> From ada27d3a56ba89513721e24abe4a4bebee2ab9cf Mon Sep 17 00:00:00 2001
> From: Ian Campbell <ian.campbell@xxxxxxxxxx>
> Date: Wed, 24 Sep 2014 15:13:28 +0100
> Subject: [PATCH] xen: arm: correct VTCR setting on arm32.
> 
> 1c92a2aaf8c6 "xen: arm: support for up to 48-bit IPA addressing on
> arm64" inadvertently changes the VTCR setting for 32-bit from
> 0x80003558 to 0x80003518, changing the SL0 setting from 0x1 (p2m
> starts at L1) to 0x0 (p2m starts at L2).
> 
> For some (inexplicable) reason this doesn't cause any issue on
> Arndale but it does on the OdroidXU.
> 
> Reported-by: Suriyan Ramasami <suriyan.r@xxxxxxxxx>
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx>

Regards,

-- 
Julien Grall

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