Adrian Chadd wrote:
2009/6/5 Bruno Damour <>:
I have tried for some time to get to install freeBSD on an up-to-date (SXCE
b114) opensolaris xvm box  (xen 3.1.4) which already has had success in
running in a quite stable xay NetBSD and Gentoo Linux as PV domUs and
different Windows flavours (Server 2008, Win7 RC, Xp, Server 2003) as HVM


I've been meaning to trial FreeBSD under Opensolaris/Xen. Thanks for
trying it out!

However, freeBSD does not boot as an HVM host and xen-kernel have been
impossible to find.

It should boot as a HVM host. Please post further details. I admit I
haven't even looked at HVM support yet as I just use PVM exclusively

So I'm glad eventually Adrian put some kernel/images, which I have tried to
My goal is to be able to install and run a current freebsd.

It has been a bit hacky, but it boots allright with adrians kernel and image
as xbd0. I've even succeeded to install a 7.2-RELEASE via sysinstall/ftp to
a zvol (under xbd2).

Could you please post what you've done here?

However, even if ftp install works, network traffic in general (ftp to dom0,
ssh, csup) panics the domu and in about 1 case of 4 even freezes the dom0.

I'll upload a more recent filesystem image now for you to test. It
should be more stable. I'd like to fix all all of the DomU panics as
soon as possible. I'd also be curious about the DomU messing up the
Dom0 - I've seen it happen before locally using Linux. I think the
various Xen related groups out there would love to hear about any
issues which upset dom0 stability.

It might be related to my dom0 being an amd64 (intel core2 quad E6600)
whereas adrian's system  is i386 ?

Later versions of the Xen hypervisor should support 32-bit PVM on
64-bit hypervisor/dom0.

I cannot even try to build a new kernel because :
- there is no xen in 7.2-RELEASE which I can isntall
- updating via csup to current does not work (as mentioned)
- I cannot find a way to install a current snapshot as I cannot boot from
the downloaded iso images i have (no cdrom, Adrian's kernel only boots  from
root image)
- I have no bare metal freebsd host I can use to build a different kernel

Any ideas ?

I've built a more recent -current image here to do tests with. I'll
upload it as a filesystem image for you to do testing with.

I'd like whatever information you can provide about the domU panic. It
should dump you into the kernel debugger. Please type "bt" at the
(ddb) prompt and then provide me with a copy of the domU console
output. Don't kill the domain either; I may ask for further ddb

My goal is to try and sort out the majority of stability issues in the
single vcpu DomU case before 8.0-RELEASE. I don't have any plans (ie,
I just can't dedicate any further unpaid time) to work on making 64
bit support function or making the installation process easier.
Thanks for your quick reply !

Here is a summary of the process to install on a zvol

   <xen config : dworkin.cfg
   bootloader = "/usr/lib/xen/bin/pygrub"
   <kernel from adrian chadd>
   kernel = "/boot/kernel/kernel"
   extra = "vfs.root.mountfrom=ufs:xbd0"
   extra += ",boot_verbose=yes,kern.hz=256"
   disk = [
   <NB: important to use xbd2 not xbd1, it would be used as swap>

   # zfs create -V 15G tank/dworkin.raw
   # xm new dworkin.cfg
   <in xterm to get menu right>
   # xm start dworkin -c

   # sysinstall
   < ->Index->Partition
       xbd2, auto, write
       ->Exit Install>
   # halt
   # xm start dworkin -c
   </dev/xbd2s1 shows up>
   # sysinstall
   < ->Index->Label
       xbd1, auto, write (ignore errors)
       ->Exit Install>
   # halt
   <halt fails : # xm shutdown dworkin from Dom0)

   # xm start dworkin -c
   <all new slices show up>
   # mkdir /mnt/freebsd
   # newfs /dev/xbd2s1a
   # mount -t ufs /dev/xbd2s1a /mnt/freebsd/
   # mkdir /mnt/freebsd/var
   # newfs /dev/xbd2s1d
   # mount -t ufs /dev/xbd2s1d /mnt/freebsd/var/
   # mkdir /mnt/freebsd/tmp
   # newfs /dev/xbd2s1e
   # mount -t ufs /dev/xbd2s1e /mnt/freebsd/tmp
   # mkdir /mnt/freebsd/usr
   # newfs /dev/xbd2s1f
   # mount -t ufs /dev/xbd2s1f /mnt/freebsd/usr

   # swapon /dev/xbd2s1b

   # ifconfig xn0 inet && route add default
   # echo domain ruomad.local >/etc/resolv.conf
   # echo nameserver >>/etc/resolv.conf
   # cat /etc/resolv.conf
   # ping
   <network OK>

   # cd /mnt/freebsd
   # sysinstall
   sysinstall get all, install to /mnt/freebsd, tem /mnt/tmp, IPv6, >

   cd /mnt/freebsd
   tweak /etc/ttys (add xc0), /etc resolv.conf, /etc/fstab
   change dworkin.cfg with :
   extra = "vfs.root.mountfrom=ufs:xbd2s1a"
   it boots !!! ;-) but I cannot cvs

And here is the panic.
This one is directly after booting to your kernel and image and cd to a free space on the freshly mounted zvol (as above).

   csup /root/stable-supfile
   Connected to
   Kernel page fault with the following non-sleepable locks held:
   exclusive sleep mutex xennetif_tx (network transmit lock) r = 0
   (0xc39440a0) locked @
   KDB: stack backtrace:
   X_db_sym_numargs(c0360308,c3527ab8,c0111ac5,c0383ef6,45e,...) at
   kdb_backtrace(c0383ef6,45e,ffffffff,c0511ef4,c3527af0,...) at
   witness_display_spinlock(c036278d,c3527b04,4,1,0,...) at
   witness_warn(5,0,c038c634,c3527b60,c,...) at witness_warn+0x1fd
   trap(c3527b8c) at trap+0x13e
   alltraps(c39440a0,0,c0383ef6,45e,6450ffff,...) at alltraps+0x1b
   xlvbd_add(c3944000,c3527cc8,c00c3814,c03d5d00,c3783738,...) at xlvbd_ad
   intr_event_add_handler(c3708bf0,c3527d38,c03587a5,336,c37097ec,...) at
   fork_exit(c00afcd0,c3708bf0,c3527d38) at fork_exit+0xb8
   fork_trampoline() at fork_trampoline+0x8
   --- trap 0, eip = 0, esp = 0xc3527d70, ebp = 0 ---

   Fatal trap 12: page fault while in kernel mode
   cpuid = 0; apic id = 00
   fault virtual address   = 0x3
   fault code              = supervisor read, page not present
   instruction pointer     = 0x21:0xc0300ad9
   stack pointer           = 0x29:0xc3527bcc
   frame pointer           = 0x29:0xc3527bfc
   code segment            = base 0x0, limit 0xf9800, type 0x1b
                           = DPL 1, pres 1, def32 1, gran 1
   processor eflags        = interrupt enabled, resume, IOPL = 0
   current process         = 12 (irq135: xn)
   [thread pid 12 tid 100024 ]
   Stopped at      xlvbd_add+0x2039:       cmpl    $0,0(%edi)

And here is the only message I have got about Dom0 crash

   Jun  5 01:43:57 amber xnb: [ID 703724 kern.warning] WARNING:
   xnb_from_peer: failed to map buffer: -3

I will try your knew image this evening (after work ;-)
Thanks a lot

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