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

[Oleksandr Andrushchenko <andr2000@xxxxxxxxx>]

Hello, Vikram!

First of all what makes you think this is related to PV DRM?

Please see inline for more comments

Thank you,

Oleksandr

On 12/18/18 7:26 AM, Vikram K wrote:
> Hello,
>
> When PV DRM is enabled and Domain-U is started xen is not able to 
> converted virtual address to physical. Please provide input on 
> resolving this issue.
> Please find the details below.
>
>   * 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?
>   * Xen-4.12 unstable version.
We never tested PV DRM with 4.12 so far, did you try with 4.10 for example?

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=DomD,be-alloc=0,connectors=HDMI-A-1:1920x1080']|*
Do you really have DomD as your configuration says?

Not Dom0 running the backend?

> Before launching the application ran the displ_be application in the 
> background.
>  $ displ_be -m DRM -v *:Debug
Please add display backend logs
> Started Domain-U.
> $ xl create -c debian.cfg
Could you please build the PV DRM driver 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?

> Getting below logs.
> Welcome to Debian GNU/Linux 9 (stretch)!
>
> (XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=0xffff80003df6c050 
> flags=0x1 par=0x809
> [    2.601162] systemd[1]: Set hostname to <hikey960>.
> [    2.613526] random: systemd: uninitialized urandom read (16 bytes 
> re(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=0xffff80003df6c05f 
> flags=0x1 par=0x809
> ad)
> (XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=0xffff80003df6c05f 
> flags=0x1 par=0x809
> (XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=0xffff80003df6c050 
> flags=0x1 par=0x809
> (XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=0xffff80003df6c05f 
> flags=0x1 par=0x809
[snip]
> --
> Thanks & Regards
> Vikram KS
>
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[1] 
https://elixir.bootlin.com/linux/v4.20-rc7/source/drivers/xen/Kconfig#L175
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