Re: [Xen-devel] failed to build xen from source code

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 05/31/2010 12:56 AM, wenche_chang@xxxxxxxxxxxx wrote:
> Hi
> I forgot something to modify,and xen works now and there are still
> some problems.
> The following is the message when booting
> mount: xenfs already mounted or /proc/xen busy
> mount: according to mtab, none is already mounted on /proc/xen
> If I remove the "none /proc/xen xenfs defaults 0 0" in
> /etc/fstab,there is not this message but xen can't work,too
> Is this message correct or I have to modify something ?

I think xend also tries to mount /proc/xen on its own without checking
that it has already been done. There are no side-effects from this.

>
>
> The second problem is booting takes a long time.
> After showing the message above,it takes about 2 minutes or more then
> entering OS.
> I find some error messages in /log/messages
>
> May 31 15:16:02 localhost kernel: XENBUS: Unable to read cpu state
> May 31 15:16:02 localhost kernel: XENBUS: Unable to read cpu state
> May 31 15:16:02 localhost kernel: XENBUS: Unable to read cpu state
> May 31 15:16:02 localhost kernel: XENBUS: Unable to read cpu state
> May 31 15:16:02 localhost kernel: XENBUS: Unable to read cpu state

These messages are from xenstored starting up, and appear harmless
(though I haven't investigated exactly why they're appearing).

> May 31 15:16:02 localhost kernel: xenbus_probe_devices backend
> May 31 15:16:02 localhost kernel: xenbus_probe_devices failed
> xenbus_directory
> May 31 15:16:02 localhost kernel: backend_probe_and_watch devices
> probed ok
> May 31 15:16:02 localhost kernel: backend_probe_and_watch watch add ok ok
> May 31 15:16:02 localhost kernel: backend_probe_and_watch all done
> May 31 15:16:02 localhost kernel: xenbus_probe_devices device
> May 31 15:16:02 localhost kernel: xenbus_probe_devices failed
> xenbus_directory
> May 31 15:16:02 localhost kernel: frontend_probe_and_watch devices
> probed ok
> May 31 15:16:02 localhost kernel: frontend_probe_and_watch watch add ok ok
> May 31 15:16:02 localhost kernel: frontend_probe_and_watch all done

This is just debug noise, and shouldn't cause any slowdown.

> The problem is caused by these error?

No. If you boot with "printk.time=1 initcall_debug" it should show you a
boot log with timestamps which will point out what is being slow at boot
time.

J

> Thanks
> ------------------------------------------------------------------------
> *From:* Pasi KÃrkkÃinen [mailto:pasik@xxxxxx]
> *Sent:* 2010/5/31 [ææä] äå 12:57
> *To:* Wen Che Chang (RD-TW)
> *Cc:* Xen-devel@xxxxxxxxxxxxxxxxxxx
> *Subject:* Re: [Xen-devel] failed to build xen from source code
>
> On Mon, May 31, 2010 at 10:38:32AM +0800, wenche_chang@xxxxxxxxxxxx wrote:
> > Hi pasi
> >
> > After following the fstab entry on the XenParavirtOps wiki
> page,there are
> > files in /proc/xen
> > I also check the dom0 config file, and there is "<*> Xen /dev/xen/evtchn
> > device".
> > But in lsmod,there is not xen-evtchn.
> > I tried modprobe xen-evtchn,and it shows "FATAL : xen_evtchn not found"
> > do I forget something to do??
> >
>
> You have compiled it statically in, so then it's not built as a module.
> No need to load it, it's already in there.
>
> After you see files under /proc/xen you should be able to start xend.
>
> If it still doesn't work.. do you have selinux enabled?
>
> -- Pasi
>
> > thanks
> >
> >
> --------------------------------------------------------------------------
> >
> > From: Pasi KÃrkkÃinen [mailto:pasik@xxxxxx]
> > Sent: 2010/5/28 [ÂPÅÃâ] âUâà 06:27
> > To: Wen Che Chang (RD-TW)
> > Cc: Xen-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-devel] failed to build xen from source code
> >
> > On Fri, May 28, 2010 at 06:18:18PM +0800, wenche_chang@xxxxxxxxxxxx
> wrote:
> > > Hi pasi
> > >
> > > You are right.
> > > There is not any file in /proc/xen and I can't see xen-evtchn when
> I run
> > lsmod.
> > >
> > > But I don???t know how to fix these problems even I read the link in
> > wiki.
> > > Can you provide more detail reference?
> > >
> >
> > - Check your dom0 kernel .config file. Is the Xen event channel compiled
> > in, or is it built as a module?
> > If it's a module, then use "modprobe xen-evtchn" to load it.
> >
> > - For mounting /proc/xen see the example fstab entry on the
> XenParavirtOps
> > wiki page. Add the line to /etc/fstab and after that run "mount
> > /proc/xen".
> > Xen 3.4.3 and 4.0.0 should automatically mount /proc/xen though.
> >
> > -- Pasi
> >
> > > thanks a lot.
> > > -----Original Message-----
> > > From: Pasi KÃrkkÃinen [[1]mailto:pasik@xxxxxx]
> > > Sent: Friday, May 28, 2010 5:48 PM
> > > To: Wen Che Chang (RD-TW)
> > > Cc: Xen-devel@xxxxxxxxxxxxxxxxxxx
> > > Subject: Re: [Xen-devel] failed to build xen from source code
> > >
> > > On Fri, May 28, 2010 at 05:35:09PM +0800, wenche_chang@xxxxxxxxxxxx
> > wrote:
> > > > Hi
> > > > I have read "Xend does not start when using pv_ops dom0 kernel? "in
> > this link and I don???t think it's my problem
> > > >
> > > > I download SRPM of XEN 4.0.0 from
> > [2]http://pasik.reaktio.net/fedora/xen-4.0.0-0.7.fc12.src.rpm or
> >
> [3]http://fedorapeople.org/~myoung/dom0/src/xen-4.0.0-0.7.fc12.src.rpm
> <http://fedorapeople.org/%7Emyoung/dom0/src/xen-4.0.0-0.7.fc12.src.rpm>
> > > >
> > > > After installation it in Fedora 12 , xend works well, but it can't
> > start if I install Xen from [4]http://xenbits.xen.org/xen-4.0-testing.hg
> > > >
> > >
> > > I think the init scripts in Fedora rpm do more than the default
> scripts
> > in upstream Xen.
> > >
> > > So:
> > > - Do you have /proc/xen (xenfs) mounted? Do you have files in it?
> > > - Do you have xen-evtchn driver loaded? Run lsmod if it's compiled
> > as a module in your dom0 kernel.
> > >
> > > Both of those need to be OK before xend starts.
> > >
> > > -- Pasi
> > >
> > > > -----Original Message-----
> > > > From: Pasi KÃrkkÃinen [[5]mailto:pasik@xxxxxx]
> > > > Sent: Friday, May 28, 2010 4:51 PM
> > > > To: Wen Che Chang (RD-TW)
> > > > Cc: jeremy@xxxxxxxx; Xen-devel@xxxxxxxxxxxxxxxxxxx
> > > > Subject: Re: [Xen-devel] failed to build xen from source code
> > > >
> > > > On Fri, May 28, 2010 at 03:33:54PM +0800, wenche_chang@xxxxxxxxxxxx
> > wrote:
> > > > > Hi
> > > > >
> > > > > after install these two RPMs , I can build and install the xen
> > 4.0.1
> > > > >
> > > > > But there are some troubles about xend , the error message is
> > shown as
> > > > > below
> > > > >
> > > > > [root@localhost ~]# xm list
> > > > > Unable to connect to xend: No such file or directory. Is xend
> > running?
> > > > >
> > > > > [root@localhost ~]# xend
> > > > > ERROR Internal error: Could not obtain handle on privileged
> > command
> > > > > interface (2 = No such file or directory)
> > > > > Traceback (most recent call last):
> > > > > File "/usr/sbin/xend", line 36, in <module>
> > > > > from xen.xend.server import SrvDaemon
> > > > > File
> > "/usr/lib64/python2.6/site-packages/xen/xend/server/SrvDaemon.py",
> > > > > line 26, in <module>
> > > > > import relocate
> > > > > File
> > "/usr/lib64/python2.6/site-packages/xen/xend/server/relocate.py",
> > > > > line 28, in <module>
> > > > > from xen.xend import XendDomain
> > > > > File
> > "/usr/lib64/python2.6/site-packages/xen/xend/XendDomain.py", line
> > > > > 36, in <module>
> > > > > from xen.xend import XendOptions, XendCheckpoint,
> > XendDomainInfo
> > > > > File
> > "/usr/lib64/python2.6/site-packages/xen/xend/XendCheckpoint.py",
> > > > > line 20, in <module>
> > > > > from xen.xend import balloon, sxp, image
> > > > > File "/usr/lib64/python2.6/site-packages/xen/xend/image.py",
> > line 46, in
> > > > > <module>
> > > > > xc = xen.lowlevel.xc.xc()
> > > > > xen.lowlevel.xc.Error: (1, 'Internal error', 'Could not obtain
> > handle on
> > > > > privileged command interface (2 = No such file or directory)')
> > > > >
> > > > >
> > > > > Any idea?
> > > > >
> > > >
> > > >
> > > > Try reading the troubleshooting tips at:
> > > > [6]http://wiki.xensource.com/xenwiki/XenParavirtOps
> > > >
> > > >
> > > > -- Pasi
> > > >
> > > >
> > > > >
> >
> --------------------------------------------------------------------------
> > > > >
> > > > > From: Jeremy Fitzhardinge [[7]mailto:jeremy@xxxxxxxx]
> > > > > Sent: 2010/5/28 [ÂPÅÃÂÃ] ÂÃUÂÃÃ 12:19
> > > > > To: Wen Che Chang (RD-TW)
> > > > > Cc: Xen-devel@xxxxxxxxxxxxxxxxxxx
> > > > > Subject: Re: [Xen-devel] failed to build xen from source code
> > > > >
> > > > > On 05/27/2010 08:47 PM, wenche_chang@xxxxxxxxxxxx wrote:
> > > > > > Hi
> > > > > > I tried to install Xen 4.0.1 from
> > > > > > [1][8]http://*xen*bits.*xen*.org/*xen*-*4.0*-testing.hg
> > > > > > <[2][9]http://xenbits.xen.org/xen-4.0-testing.hg>
> > > > > > I use the installation step in Xen wiki as shown below
> > > > > > yum groupinstall "Development Libraries"
> > > > > > yum groupinstall "Development Tools"
> > > > > > yum install transfig texi2html libaio-devel dev86 glibc-devel
> > > > > e2fsprogs-devel gitk mkinitrd iasl xz-devel bzip2-devel
> > > > > > hg clone [3][10]http://xenbits.xen.org/xen-4.0-testing.hg
> > > > > > cd xen-4.0-testing.hg
> > > > > > make xen
> > > > > > make tools
> > > > > > make stubdom
> > > > > > I failed in "make tools" and it shows
> > > > > > /usr/bin/ld: cannot find -lpci
> > > > > >
> > > > >
> > > > > I think you also need pciutils-libs and pciutils-devel.
> > > > >
> > > > > J
> > > > >
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> > > > > References
> > > > >
> > > > > Visible links
> > > > > 1. [11]http://*xen*bits.*xen*.org/*xen*-*4.0*-testing.hg
> > > > > 2. [12]http://xenbits.xen.org/xen-4.0-testing.hg
> > > > > 3. [13]http://xenbits.xen.org/xen-4.0-testing.hg
> > > >
> > > > > _______________________________________________
> > > > > Xen-devel mailing list
> > > > > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > > > > [14]http://lists.xensource.com/xen-devel
> > > >
> > > >
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> > TREND MICRO EMAIL NOTICE
> > The information contained in this email and any attachments is
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> >
> > References
> >
> > Visible links
> > 1. mailto:pasik@xxxxxx
> > 2. http://pasik.reaktio.net/fedora/xen-4.0.0-0.7.fc12.src.rpm
> > 3.
> http://fedorapeople.org/~myoung/dom0/src/xen-4.0.0-0.7.fc12.src.rpm
> <http://fedorapeople.org/%7Emyoung/dom0/src/xen-4.0.0-0.7.fc12.src.rpm>
> > 4. http://xenbits.xen.org/xen-4.0-testing.hg
> > 5. mailto:pasik@xxxxxx
> > 6. http://wiki.xensource.com/xenwiki/XenParavirtOps
> > 7. mailto:jeremy@xxxxxxxx
> > 8. http://*xen*bits.*xen*.org/*xen*-*4.0*-testing.hg
> > 9. http://xenbits.xen.org/xen-4.0-testing.hg
> > 10. http://xenbits.xen.org/xen-4.0-testing.hg
> > 11. http://*xen*bits.*xen*.org/*xen*-*4.0*-testing.hg
> > 12. http://xenbits.xen.org/xen-4.0-testing.hg
> > 13. http://xenbits.xen.org/xen-4.0-testing.hg
> > 14. http://lists.xensource.com/xen-devel
>
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