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Re: [Xen-users] Xen PV display drivers

  • To: Oleksandr Andrushchenko <andr2000@xxxxxxxxx>, Rajagopal Aravindan <a.rajagopal.81@xxxxxxxxx>, Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>
  • From: Rajagopal Aravindan <a.rajagopal@xxxxxxxxxxxxxxxxxx>
  • Date: Fri, 15 Nov 2019 03:13:16 +0000
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  • Cc: Julien Grall <julien.grall@xxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Fri, 15 Nov 2019 03:14:50 +0000
  • List-id: Xen user discussion <xen-users.lists.xenproject.org>
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  • Thread-topic: [Xen-users] Xen PV display drivers
Hello Oleksandr,

>>BTW, just out of curiosity, what are you trying to achieve?
We would like to share a single display among multiple guests, with ONLY 1 guest's GUI visible at any time.
Dynamically, the user should be able to switch to any guest's GUI, through some gesture or special key stroke.

Please let me know in case I am NOT clear.

Thanks,
Rajagopal

From: Xen-users <xen-users-bounces@xxxxxxxxxxxxxxxxxxxx> on behalf of Oleksandr Andrushchenko <andr2000@xxxxxxxxx>
Sent: Thursday, November 14, 2019 11:57 PM
To: Rajagopal Aravindan <a.rajagopal.81@xxxxxxxxx>; Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>; xen-users@xxxxxxxxxxxxxxxxxxxx <xen-users@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Xen PV display drivers
 
On 11/14/19 20:14, Rajagopal Aravindan wrote:
> Hello Oleksandr,
>
> >>We run Weston full-screen, cannot understand what exactly the problem?
> Is it possible for the guest to render natively on a display ?

If you mean without passing through a display? I guess no,

we are talking about para-virtual display

> If yes, is it possible for a display to be switched between the
> guests, dynamically ?

In our setup we have Weston + display backend, so all guests are Weston
clients

internally (display backend creates a new Weston client for each guest).

Thus, every client is just a Weston window, so you can switch as you wish


BTW, just out of curiosity, what are you trying to achieve?

>
> Thanks,
> Rajagopal

Thank you,

Oleksandr

>
> On Thu, Nov 14, 2019 at 12:25 PM Oleksandr Andrushchenko
> <Oleksandr_Andrushchenko@xxxxxxxx
> <mailto:Oleksandr_Andrushchenko@xxxxxxxx>> wrote:
>
>
>     On 11/13/19 7:07 PM, Rajagopal Aravindan wrote:
>     > Hello Oleksandr,
>     >
>     Hi,
>     > >>This should be all you need
>     >
>     > Is it possible to render a Xen guest's GUI directly on a display,
>     > without PCI pass-through ?
>     PCI pass-through is not needed for PV display to work
>     > When I say directly, I mean in full-screen, just like how native
>     OS's
>     > GUI is rendered.
>     We run Weston full-screen, cannot understand what exactly the problem?
>     >
>     > Any pointers will be helpful.
>     >
>     > Looking forward to your reply.
>     >
>     > Thanks,
>     > Rajagopal
>     >
>     >
>     >
>     > On Thu, Oct 17, 2019 at 2:04 PM Oleksandr Andrushchenko
>     > <andr2000@xxxxxxxxx <mailto:andr2000@xxxxxxxxx>
>     <mailto:andr2000@xxxxxxxxx <mailto:andr2000@xxxxxxxxx>>> wrote:
>     >
>     >     Hi, sorry for late reply
>     >
>     >     On 10/17/19 11:27 AM, Rajagopal Aravindan wrote:
>     >     > Hello Oleksandr,
>     >     >
>     >     > >>We do not use framebuffer drivers in our setups, but PV
>     display
>     >     > (Linux KMS).
>     >     > >>Please let me know if you need details on that.
>     >     > Yes, could you please share some details, to consolidate
>     whatever
>     >     > little study we have carried out so far ?
>     >     >
>     >     In order to run Xen PV display you need:
>     >     1. PV display front kernel driver [1]
>     >     2. PV display backend - user-space backend which runs either as
>     >     a Weston client or can run as DRM KMS client.
>     >     3. Configure your domain, for examples please see [3] and of
>     >     course [4]
>     >
>     >     This should be all you need
>     >     > Look forward to your reply.
>     >     >
>     >     > Thanks,
>     >     > Rajagopal
>     >     Thank you,
>     >     Oleksandr
>     >     >
>     >     > On Fri, Sep 6, 2019 at 10:58 AM Oleksandr Andrushchenko
>     >     > <Oleksandr_Andrushchenko@xxxxxxxx
>     <mailto:Oleksandr_Andrushchenko@xxxxxxxx>
>     >     <mailto:Oleksandr_Andrushchenko@xxxxxxxx
>     <mailto:Oleksandr_Andrushchenko@xxxxxxxx>>
>     >     > <mailto:Oleksandr_Andrushchenko@xxxxxxxx
>     <mailto:Oleksandr_Andrushchenko@xxxxxxxx>
>     >     <mailto:Oleksandr_Andrushchenko@xxxxxxxx
>     <mailto:Oleksandr_Andrushchenko@xxxxxxxx>>>> wrote:
>     >     >
>     >     >     Hi,
>     >     >     On 9/5/19 9:47 PM, Julien Grall wrote:
>     >     >     > Hi,
>     >     >     >
>     >     >     > I am adding Oleksandr who has been looking after PV
>     >     display driver
>     >     >     > recently.
>     >     >     >
>     >     >     We do not use framebuffer drivers in our setups, but
>     PV display
>     >     >     (Linux KMS).
>     >     >     Please let me know if you need details on that.
>     >     >
>     >     >     > Cheers,
>     >     >     >
>     >     >     > On 8/28/19 6:49 PM, Rajagopal Aravindan wrote:
>     >     >     >> Hello Julien,
>     >     >     >>
>     >     >     >> I am trying to understand how a Dom-U's GUI desktop is
>     >     viewable
>     >     >     >> through vncviewer.
>     >     >     >> While I see a fbfront driver in Ubuntu running as
>     Dom-U, I
>     >     >     don't see
>     >     >     >> a fbback driver or equivalent.
>     >     >     >>
>     >     >     fbfront is a kernel driver and its counterpart
>     (fbback) is a
>     >     part of
>     >     >     QEMU [1]
>     >     >
>     >     >     >> Can you please provide me some info or links on this ?
>     >     >     OFFTOP: I am not subscribed on xen-users@, so I miss
>     all the
>     >     mails
>     >     >     there
>     >     >     >>
>     >     >     >> Thanks,
>     >     >     >> Rajagopal
>     >     >     >
>     >     >     [1]
>     >     >
>     >
>     https://xenbits.xen.org/gitweb/?p=qemu-xen.git;a=blob;f=hw/display/xenfb.c;h=3c79913b31a67d162299f598002133881e064c87;hb=HEAD
>     >   
>      <https://urldefense.com/v3/__https://xenbits.xen.org/gitweb/?p=qemu-xen.git;a=blob;f=hw*display*xenfb.c;h=3c79913b31a67d162299f598002133881e064c87;hb=HEAD__;Ly8!K6dmGCEab4ueJg!j9cYW5SDDMpbQgDU4fEoDSV6yFKY_aAAgigiDgIXgR2EDwZV9aWLE4YrzkEfpgnqcI3mhmjNEQ$>
>     >     >
>     >     [1]
>     > https://elixir.bootlin.com/linux/v5.4-rc2/source/drivers/gpu/drm/xen
>     >   
>      <https://urldefense.com/v3/__https://elixir.bootlin.com/linux/v5.4-rc2/source/drivers/gpu/drm/xen__;!K6dmGCEab4ueJg!j9cYW5SDDMpbQgDU4fEoDSV6yFKY_aAAgigiDgIXgR2EDwZV9aWLE4YrzkEfpgnqcI0GxlIzyA$>
>     >     [2] https://github.com/xen-troops/displ_be
>     >   
>      <https://urldefense.com/v3/__https://github.com/xen-troops/displ_be__;!K6dmGCEab4ueJg!j9cYW5SDDMpbQgDU4fEoDSV6yFKY_aAAgigiDgIXgR2EDwZV9aWLE4YrzkEfpgnqcI3DuTe6xg$>
>     >     [3]
>     >
>     https://github.com/xen-troops/meta-xt-prod-gen3-test/tree/master/recipes-dom0/dom0-image-thin-initramfs/files/meta-xt-prod-extra/recipes-extended/guest-addons/files
>     >   
>      <https://urldefense.com/v3/__https://github.com/xen-troops/meta-xt-prod-gen3-test/tree/master/recipes-dom0/dom0-image-thin-initramfs/files/meta-xt-prod-extra/recipes-extended/guest-addons/files__;!K6dmGCEab4ueJg!j9cYW5SDDMpbQgDU4fEoDSV6yFKY_aAAgigiDgIXgR2EDwZV9aWLE4YrzkEfpgnqcI2yhP65ug$>
>     >     [4] https://xenbits.xen.org/docs/unstable/man/xl.cfg.5.html
>     >   
>      <https://urldefense.com/v3/__https://xenbits.xen.org/docs/unstable/man/xl.cfg.5.html__;!K6dmGCEab4ueJg!j9cYW5SDDMpbQgDU4fEoDSV6yFKY_aAAgigiDgIXgR2EDwZV9aWLE4YrzkEfpgnqcI00wih9yw$>
>     >
>

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