Regarding hdmi sharing in xen

Regarding hdmi sharing in xen

[George John]

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hi,
I am a newbie. Please correct if I am wrong?. I have a r-car H3 board with
Dom0 and two DomU's. Do we have to passthrough one of the hdmi ports to the
one guest if we could implement GPU sharing between Dom0 and one DomU in
r-car h3 board.?

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Re: Regarding hdmi sharing in xen

[Andrii Anisov]

Dear George John,


On 17.07.17 09:59, George John wrote:
> I have a r-car H3 board with Dom0 and two DomU's.
Are you speaking about Salvator-X or H3ULCB?

> Do we have to passthrough one of the hdmi ports to the one guest if we 
> could implement GPU sharing between Dom0 and one DomU in r-car h3 board.?
It really depends on the setup you need.
GPU sharing is not strictly tied to display sharing. So you could split 
DUs between domains, or utilize some PV Display driver implementing [1].

[1] 
https://lists.xenproject.org/archives/html/xen-devel/2017-04/msg00470.html

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*Andrii Anisov*



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Re: Regarding hdmi sharing in xen

[George John]

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>
> Dear Andrii Anisov,

Thank you for the reply.
We are using R-Car H3 salvator X.

> It really depends on the setup you need.

 Our plan is to run Linux as Dom0 and Android as DomU. The Linux portion
will be having 1 HDMI display and the Android porion will be having 1 HDMI.
Can we share the DU and use the HDMI port as it is in the guests? In case
the DU is shared, will it be possible to Passthrough the HDMI to other
Guests?

Regards,
George

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Re: Regarding hdmi sharing in xen

[Andrii Anisov]

Dear George,

First I would state terms as following:
* Sharing HW - using the same hardware by different domains using PV 
drivers, so actually one domain accessing the HW directly and serves 
other domains.
* Assigning HW - providing access to some particular HW for some 
particular domain. E.g. peripherals by default are assigned to Dom0, but 
using Passthrough some could be assigned to DomU.

On 19.07.17 07:41, George John wrote:
> Our plan is to run Linux as Dom0 and Android as DomU. The Linux 
> portion will be having 1 HDMI display and the Android porion will be 
> having 1 HDMI.
> Can we share the DU and use the HDMI port as it is in the guests?
IIRC last year it was shown a setup with Salvator-X board, where one 
HDMI display was *assigned* to Linux (Dom0) and one HDMI display was 
*assigned* to Android. So such setup is technically feasible.
If a domain has assigned a display to use solely, it can share that 
display to other domains using displif protocol [1].

[1] 
https://lists.xenproject.org/archives/html/xen-devel/2017-04/msg00470.html

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*Andrii Anisov*



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