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

Sorry for top-posting.

Well, from the logs I see that those failures come before PV DRM

even creates any shared buffers which could be the problem:

when you see

(XEN) p2m.c:1456: d2v1: gvirt_to_maddr failed va=0xffff80001df5205f flags=0x1 par=0x809 (XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=0xffff80001df8005f flags=0x1 par=0x809

in your logs this at the time when PV DRM had read the configuration and

created shared rings, but it hasn't yet allocated any buffers so far which might

be the source of p2m complaints. So, unfortunately, I think you would need to debug more

to understand from where those come.

And, please rebuild the PV DRM as a module and collect DRM logs in DomU.

On 12/19/18 7:45 AM, Vikram K wrote:
Hello Oleksandr,

Please find the attached log file.

Could please provide some pointers on how test DomU display.

modetest, weston - whatever you have in your rootfs
On Tue, Dec 18, 2018 at 12:06 PM Oleksandr Andrushchenko <andr2000@xxxxxxxxx <mailto: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.

Well, this just adds zero-copying, but shouldn't change the behavior so much
>   * 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
This needs to be done *before* you insmod the PV DRM driver

>> and get back with DRM logs in DomU?
Please find the attached log file
Thanks & Regards
Vikram KS

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