Hi Stefano, Thanks!
Any input further as per the logs attached? Regards, Vipul Kumar On Wed, Oct 19, 2022 at 10:49 PM Vipul Suneja <vsunej...@gmail.com> wrote: > Hi Stefano, > > Thanks for the response! > > I am following the same link you shared from the beginning. Tried the > command "vncviewer localhost:0" in DOM0 but same issue "Can't open > display", below are the logs: > > > > > > > > *root@raspberrypi4-64:~# vncviewer localhost:0TigerVNC Viewer 64-bit > v1.11.0Built on: 2020-09-08 12:16Copyright (C) 1999-2020 TigerVNC Team and > many others (see README.rst)See https://www.tigervnc.org > <https://www.tigervnc.org> for information on TigerVNC.Can't open display:* > > Below are the netstat logs, i couldn't see anything running at port 5900 > or 5901: > > > > > > > > > > > > > > > > > > > > > > > > > > > *root@raspberrypi4-64:~# netstat -tuwx Active Internet connections (w/o > servers)Proto Recv-Q Send-Q Local Address Foreign Address > State tcp 0 164 192.168.1.39:ssh 192.168.1.38:37472 > <http://192.168.1.38:37472> ESTABLISHED Active UNIX domain sockets > (w/o servers)Proto RefCnt Flags Type State I-Node > Pathunix 8 [ ] DGRAM CONNECTED 10565 /dev/logunix > 3 [ ] STREAM CONNECTED 10891 > /var/run/xenstored/socketunix 3 [ ] STREAM CONNECTED > 13791 unix 3 [ ] STREAM CONNECTED 10843 > /var/run/xenstored/socketunix 3 [ ] STREAM CONNECTED > 10573 /var/run/xenstored/socketunix 2 [ ] DGRAM > CONNECTED 14510 unix 3 [ ] STREAM CONNECTED > 13249 unix 2 [ ] DGRAM CONNECTED 13887 unix 2 > [ ] DGRAM CONNECTED 10599 unix 3 [ ] > STREAM CONNECTED 14005 unix 3 [ ] STREAM > CONNECTED 13258 unix 3 [ ] STREAM CONNECTED > 13248 unix 3 [ ] STREAM CONNECTED 14003 unix 3 > [ ] STREAM CONNECTED 10572 /var/run/xenstored/socketunix > 3 [ ] STREAM CONNECTED 10786 > /var/run/xenstored/socketunix 3 [ ] DGRAM CONNECTED > 13186 unix 3 [ ] STREAM CONNECTED 10864 > /var/run/xenstored/socketunix 3 [ ] STREAM CONNECTED > 10812 /var/run/xenstored/socketunix 2 [ ] DGRAM > CONNECTED 14083 unix 3 [ ] STREAM CONNECTED > 10813 /var/run/xenstored/socket* > > > > > > > > > > *unix 3 [ ] STREAM CONNECTED 14068 unix 3 [ ] > STREAM CONNECTED 13256 unix 3 [ ] STREAM > CONNECTED 10571 /var/run/xenstored/socketunix 3 [ ] > STREAM CONNECTED 10842 unix 3 [ ] STREAM > CONNECTED 13985 unix 3 [ ] DGRAM CONNECTED > 13185 unix 2 [ ] STREAM CONNECTED 13884 unix 2 > [ ] DGRAM CONNECTED 14528 unix 2 [ ] DGRAM > CONNECTED 13785 unix 3 [ ] STREAM CONNECTED > 14034 * > > Attaching xen log files of /var/log/xen. > I didn't get the role of QEMU here because as mentioned earlier, I am > porting in raspberrypi 4B. > > Regards, > Vipul Kumar > > On Wed, Oct 19, 2022 at 12:43 AM Stefano Stabellini < > sstabell...@kernel.org> wrote: > >> It usually works the way it is described in the guide: >> >> >> https://www.virtuatopia.com/index.php?title=Configuring_a_VNC_based_Graphical_Console_for_a_Xen_Paravirtualized_domainU_Guest >> >> You don't need to install any VNC-related server software because it is >> already provided by Xen (to be precise it is provided by QEMU working >> together with Xen.) >> >> You only need the vnc client in dom0 so that you can connect, but you >> could also run the vnc client outside from another host. So basically >> the following should work when executed in Dom0 after creating DomU: >> >> vncviewer localhost:0 >> >> Can you attach the Xen and QEMU logs (/var/log/xen/*)? And also use >> netstat -taunp to check if there is anything running at port 5900 or >> 5901? >> >> Cheers, >> >> Stefano >> >> >> On Tue, 18 Oct 2022, Vipul Suneja wrote: >> > Hi Stefano, >> > >> > Thanks for the response! >> > >> > I could install tigerVNC, x11vnc & libvncserver in Dom0 >> xen-image-minimal but only manage to install libvncserver(couldn't install >> tigervnc >> > & x11vnc because of x11 >> > support missing, it's wayland) in DOMU custom graphical image. I tried >> running vncviewer with IP address & port in dom0 to access the domu >> > graphical image display as per below commands. >> > >> > vncviewer 192.168.1.42:5901 >> > >> > But it showing can't open display, below are the logs: >> > >> > root@raspberrypi4-64:~/guest1# vncviewer 192.168.1.42:5901 >> > >> > TigerVNC Viewer 64-bit v1.11.0 >> > Built on: 2020-09-08 12:16 >> > Copyright (C) 1999-2020 TigerVNC Team and many others (see README.rst) >> > See https://www.tigervnc.org for information on TigerVNC. >> > Can't open display: >> > root@raspberrypi4-64:~/guest1# >> > >> > I am not exactly sure what the issue is but I thought only libvncserver >> in DOMU could work to get access but it did not work. >> > If TigerVNC is the issue here then is there any other VNC source which >> could be installed for both x11 & wayland supported images? >> > >> > Regards, >> > Vipul Kumar >> > >> > On Tue, Oct 18, 2022 at 2:40 AM Stefano Stabellini < >> sstabell...@kernel.org> wrote: >> > VNC is typically easier to setup, because SDL needs extra >> libraries at >> > build time and runtime. If QEMU is built without SDL support it >> won't >> > start when you ask for SDL. >> > >> > VNC should work with both x11 and wayland in your domU. It >> doesn't work >> > at the x11 level, it exposes a special fbdev device in your domU >> that >> > should work with: >> > - a graphical console in Linux domU >> > - x11 >> > - wayland (but I haven't tested this so I am not 100% sure about >> it) >> > >> > When you say "it doesn't work", what do you mean? Do you get a >> black >> > window? >> > >> > You need CONFIG_XEN_FBDEV_FRONTEND in Linux domU >> > (drivers/video/fbdev/xen-fbfront.c). I would try to get a >> graphical text >> > console up and running in your domU before attempting x11/wayland. >> > >> > Cheers, >> > >> > Stefano >> > >> > On Mon, 17 Oct 2022, Vipul Suneja wrote: >> > > Hi, >> > > Thanks! >> > > >> > > I have ported xen minimal image as DOM0 & custom wayland GUI >> based image as DOMU in raspberry pi4B. I am trying to make GUI >> > display up >> > > for guest machine. I tried using sdl, included below line in >> guest.conf file >> > > vfb= [ 'sdl=1' ] >> > > >> > > But it is throwing below error: >> > > >> > > root@raspberrypi4-64:~/guest1# xl create -c guest1.cfg >> > > Parsing config from guest1.cfg >> > > libxl: error: libxl_qmp.c:1400:qmp_ev_fd_callback: Domain >> 3:error on QMP socket: Connection reset by peer >> > > libxl: error: libxl_qmp.c:1439:qmp_ev_fd_callback: Domain >> 3:Error happened with the QMP connection to QEMU >> > > libxl: error: libxl_dm.c:3351:device_model_postconfig_done: >> Domain 3:Post DM startup configs failed, rc=-26 >> > > libxl: error: libxl_create.c:1867:domcreate_devmodel_started: >> Domain 3:device model did not start: -26 >> > > libxl: error: libxl_aoutils.c:646:libxl__kill_xs_path: Device >> Model already exited >> > > libxl: error: libxl_domain.c:1183:libxl__destroy_domid: Domain >> 3:Non-existant domain >> > > libxl: error: libxl_domain.c:1137:domain_destroy_callback: >> Domain 3:Unable to destroy guest >> > > libxl: error: libxl_domain.c:1064:domain_destroy_cb: Domain >> 3:Destruction of domain failed >> > > >> > > Another way is VNC, i could install tigervnc in DOM0 but same i >> couldn't in guest machine because it doesn't support >> > x11(supports wayland >> > > only). I am completely blocked here, Need your support to >> enable the display up. >> > > Any alternative of VNC which could work in both x11 & wayland >> supported images? >> > > >> > > Any input on VNC, SDL or any other way to proceed on this? >> Looking forward to hearing from you. >> > > >> > > Regards, >> > > Vipul Kumar >> > >> > >> > > >
