[Xen-devel] 4.1 xend not starting - looking for /sys/devices/xen-backend/? Wrong kernel?

[Nathan March <nathan@xxxxxx>]

Hoping someone can shed some light on this since I'm finding myself very
confused by a mismatch of documentation on the wiki/mailing lists. Am I
just using the wrong kernel?

Trying to start xend 4.1 it just hangs, strace shows this repeating over
and over:

3827  stat("/sys/devices/xen-backend/", 0x7f68b23eb9f0) = -1 ENOENT (No
such file or directory)
3827  stat("/proc/net/dev", {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
3827  gettimeofday({1301688232, 369752}, NULL) = 0
3827  open("/proc/net/dev", O_RDONLY)   = 19
3827  fstat(19, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
3827  fstat(19, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
3827  mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0x7f68b9005000
3827  read(19, "Inter-|   Receive               "..., 8192) = 815
3827  read(19, "", 7168)                = 0
3827  read(19, "", 8192)                = 0
3827  close(19)                         = 0
3827  munmap(0x7f68b9005000, 4096)      = 0
3827  stat("/proc/net/dev", {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
3827  gettimeofday({1301688232, 370994}, NULL) = 0
3827  open("/proc/net/dev", O_RDONLY)   = 19
3827  fstat(19, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
3827  fstat(19, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
3827  mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0x7f68b9005000
3827  read(19, "Inter-|   Receive               "..., 8192) = 815
3827  read(19, "", 7168)                = 0
3827  read(19, "", 8192)                = 0
3827  close(19)                         = 0
3827  munmap(0x7f68b9005000, 4096)      = 0
3827  select(0, NULL, NULL, NULL, {2, 0}) = 0 (Timeout)
3827  ioctl(17, SNDCTL_DSP_RESET, 0x7f68b23ebc20) = 0
3827  ioctl(17, SNDCTL_DSP_RESET, 0x7f68b23ebc20) = -1 ESRCH (No such
process)
3827  ioctl(17, SNDCTL_DSP_RESET, 0x7f68b23ebcc0) = 0
3827  ioctl(17, SNDCTL_DSP_RESET, 0x7f68b23ebc80) = 0
3827  gettimeofday({1301688234, 374799}, NULL) = 0

>From what I can tell on the lists, /sys/devices/xen-backend/ is the new
location and /sys/bus/xen-backend/ is the old location? Does that mean
there's a newer dom0 kernel with the correct paths inside of it?

I've tried stable-2.6.32.x and next-2.6.32 and both give the same
result. Trying next-2.6.39 resulted in reboot before booting the dom0
kernel, I haven't debugged that any further yet.

The xen 4.1 documentation refers you to the 4.0.1 docs and the old
paravirtops page still has the same content it's had forever, saying
that Jeremy's stable-2.6.32.x is the recommended release.  Should I be
using one of Konrad's branches instead?

It seems very strange to me that xen 4.1 would be considered ready &
released in a state like this, with no clear documentation on what dom0
to use.

- Nathan

-- 
Nathan March <nathan@xxxxxx>
Gossamer Threads Inc. http://www.gossamer-threads.com/
Tel: (604) 687-5804 Fax: (604) 687-5806


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