From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mao Mingy <maomingya928@gmail.com>
Subject: Re: frame buffer shared by domains on arch arm linux
Date: Fri, 23 Jan 2015 18:03:50 +0800
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To: Ian Campbell <Ian.Campbell@citrix.com>
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On 23/01/2015 17:24, Ian Campbell wrote:
> On Fri, 2015-01-23 at 17:14 +0800, Mao Mingy wrote:
>> 1. QEMU's start up parameter, changed the original from Xen4.5
>> /usr/local/lib/xen/bin/qemu-system-i386 -xen-domid 0
> Are you trying to use pvfb for dom0's own graphical output?
No. I got it wrong. Right now writing to Dom0's frame buffer from Dom0 
is working.
I am trying to run the program on DomU to to write to frame buffer of 
guest DomU and it's not working
> This qemu process you quote here is running against dom0 in order to
> provide backend services for frontends running in dom0 itself, i.e.
> things like loopback qdisk mounts to the toolstack.
>
> For a domU the xl toolstack should be launching a new qemu process
> specifically for that domain, e.g. with -xen-domid <domid> (for
> domid!=0).
>
> Ian.
>
I modified the "-xen-domid" and "-name" of qemu-system-i386  to match 
the domain name and id of the guest Dom, the result is same.
The XENFB_TYPE_UPDATE event sent by guest Linux did NOT reach to QEMU 
side (xenfb_handle_events() of xenfb.c).
should it be processed here?

Thank you for the sharp thought and prompt reply.

Regards,
Mao Mingya