xen_kernel, console and X11

Roger Pau Monné royger at FreeBSD.org
Mon May 4 14:24:40 UTC 2015


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:


Could you apply it and rebuild your kernel to see if that also solves
your issues?


More information about the freebsd-virtualization mailing list