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Re: [Xen-devel] [XenGT][IGVT-g] DomU pgt_device structure initialization

I donât know exact agent. As I said, vgtbuffer ioctl interface is used only by new application which wants to composite guest framebuffer. There is no existing application from standard Linux distro using it. So thatâs why Iâm curious whether you installed something within VM.


From: Oleksii Kurochko [mailto:oleksii.kurochko@xxxxxxxxxxxxxxx]
Sent: Monday, January 11, 2016 1:44 PM
To: Tian, Kevin
Cc: Dong, Eddie; Gerd Hoffmann; Li, Susie; igvt-g@xxxxxxxxxxxx; igvt-g@xxxxxxxxxxx; xen-devel@xxxxxxxxxxxxx
Subject: Re: [XenGT][IGVT-g] DomU pgt_device structure initialization



Thanks for answer.

About what agent are u talking about? I did not install anything additional, just took vgt kernel and used it for Ubuntu distro.

I will look in events, thanks.

With the best regards,


On Mon, 11 Jan 2016, 07:07 Tian, Kevin <kevin.tian@xxxxxxxxx> wrote:

Did you install some specific agent within VM to utilize vgtbuffer ioctl interface? Itâs not a bare metal i915 interface so suppose it shouldnât be invoked for a default Linux distro environment. Yes we should add check to prevent it from being used within VM.


However this error has nothing to do with your laggy UI issue. From my experience such issue is most likely being caused by losing interrupts. For example I saw below error message in your log (only partial line):


[ 5412.902817] vGT error:(vgt_handle_events:1845) IRQ: abandon non-registered [)

You can look into the event detail to see whether such event should be explicitly handled on your platform.




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