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Hello Oleksandr,

Please find the attached log file.

Could please provide some pointers on how test DomU display.

On Tue, Dec 18, 2018 at 12:06 PM Oleksandr Andrushchenko <andr2000@xxxxxxxxx> wrote:

Hello, Vikram!

> * We are using 64 bit arm platform.
> * Linux 4.20 Kernel in DomU with PV DRM front-end drivers.
>

>> Do you have [1] enabled in your DomD kernel?

Earlier this configuration was not enabled. Enabled it now.

>
> * Xen-4.12 unstable version.
>
>> We never tested PV DRM with 4.12 so far, did you try with 4.10 for example?

Xen-4.8 is working on our platform. Xen-4.9 to Xen-4.11 version fails while initializing CPU on our platform. Recently

we received patch from Julien for Xen-4.12 unstable version, which has fix. Tried to apply patch on Xen-4.10 stable facing build issue.

This is where we are at the moment and have all PV drivers running smoothly

> * Able to build displ_be application and also its dependencies.
>
> Added below configuration in Domain-U config file.*|
> |*
> *|vdispl = [ 'backend=Domain-0,be-alloc=0,connectors=HDMI-A-1:1920x1080']|*
>
>> Do you really have DomD as your configuration says?
Sorry it not DomD it is Domain-0.

>> Not Dom0 running the backend?
Domain-0 is running in Dom0 and debian is running as DomU.

> Before launching the DomU ran the displ_be application in the
> background.
> $ displ_be -m DRM -v *:Debug &
Please add display back-end logs

>
> Started Domain-U.
> $ xl create -c debian.cfg
>
>> Could you please build the PV DRM driver as module,

>> Built as module.

then run the following commands:

echo 0xff > /sys/module/drm/parameters/debug
echo 8 > /proc/sys/kernel/printk

>> and get back with DRM logs in DomU?

Please find the attached log file

Thanks & Regards
Vikram KS

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Re: [Xen-users] [Xen-devel] [XEN][ARM64] PV DRM failing to convert virtual to physical address