xen_kernel, console and X11

[Roman Bogorodskiy]

  Roger Pau Monné wrote:

> Hello,
> 
> El 04/05/15 a les 16.16, Roman Bogorodskiy ha escrit:
> >   Roger Pau Monné wrote:
> > 
> >> Hello,
> >>
> >> El 02/05/15 a les 17.43, Roman Bogorodskiy ha escrit:
> >>> Hi,
> >>>
> >>> I'm trying to get Xen running and following these instructions:
> >>>
> >>> https://wiki.freebsd.org/Xen
> >>>
> >>> and
> >>>
> >>> http://wiki.xen.org/wiki/FreeBSD_Dom0
> >>>
> >>> I'm running two days old -CURRENT and ports. I've installed the
> >>> emulators/xen port and followed instructions in pkg-message.
> >>>
> >>> I'm having some problems with console. I'm wondering if it's possible to
> >>> have X running on the same box running xen kernel?
> >>
> >> It should be, although I had issues while using the vesa driver with a
> >> FreeBSD Xen Dom0, mainly because Dom0 doesn't have access to the BDA and
> >> EBDA, I'm working on fixing this in Xen upstream.
> >>
> >>> My setup is as follows:
> >>>  
> >>>  - Intel i5-4690 that supports IOMMU:
> >>>     $ sudo acpidump -t|grep DMAR
> >>>       DMAR: Length=128, Revision=1, Checksum=90,
> >>>     $
> >>>  - vm.max_wired=-1 in /etc/sysctl.conf
> >>>  - xc0     "/usr/libexec/getty Pc"         xterm   on  secure in
> >>>    /etc/ttys
> >>>
> >>> In loader.conf I have:
> >>>
> >>> xen_kernel="/boot/xen"
> >>> xen_cmdline="dom0_mem=2048M dom0_max_vcpus=4 dom0pvh=1 com1=115200,8n1
> >>> guest_loglvl=all loglvl=all console=com1"
> >>
> >> So you are trying to use the serial console but you are not getting any
> >> output? If that's not the case, please drop the com1 parameter and set
> >> console=vga.
> > 
> > Sorry for confusion, actually 'console=com1' works for me.
> > Initially I didn't realize that it doesn't display kernel messages and
> > after some failed attempts to run startx and hard reboots it took much
> > longer to see a login prompt because I have background fsck disabled.
> > 
> > So, 'console=com1' works unless I do 'startx'.
> 
> I'm not sure I would call it working if you don't get any kernel
> messages while booting. What happens if you set console=vga?
> 
> > 
> >> Do you have anything else in your /boot/loader.conf apart from this two
> >> lines?
> >>
> >>>
> >>> With this setup I get my system booted and at some point I can see a
> >>> login screen. When I type 'startx' the system freezes. Have to hard
> >>> reboot it to get working again.
> >>
> >> On which device do you get a login prompt? Is it xc0, ttyv0 or ttyu0?
> > 
> > I get a login prompt on ttyv0.
> > 
> > BTW, I use the nvidia driver.
> 
> Another user also reported a similar problem with Xen and X, and it was
> solved by the following patch:
> 
> https://people.freebsd.org/~royger/0001-xen-introduce-a-newbus-function-to-allocate-unused-m.patch
> 
> Could you apply it and rebuild your kernel to see if that also solves
> your issues?

Applied this patch on r282416, things didn't change: I do 'startx' in
ttyv0, X prints that it loads extensions, then a black screen with a
cursor appears and things hang.

Roman Bogorodskiy
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