TheGrebs.com:IRC Logs:#xen:2005:04:14

---	Log	opened Thu Apr 14 00:00:25 2005
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09:41	hebutterworth	\| Would appreciate help from anyone experienced with xend...
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09:41	hebutterworth	\| when I add a USB device to a front end domain, it creates the back-end domain controller
09:42	hebutterworth	\| but the creation of the back-end domain controller in xend appears to prevent the back-end domain from shutting down cleanly
09:42	hebutterworth	\| shutdown just loops
09:43	hebutterworth	\| Any ideas what needs to be done to clean up the back-end controller during shutdown would be appreciated.
09:44	mael	too bad Mark is not there at the moment
09:47	soffi	man I don't want to be in work today
09:47	soffi	grr
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11:03	smcavoy	hello
11:04	smcavoy	I am running Debian sarge and have installed the experimental packages for xen. I am just starting to build a xen enabled kernel, ran the patch, but I don't see anything identifying it as xen patched. am I missing something?
11:06	plars	smcavoy: it will build the xen kernels for you, you just need to do a make world
11:07	smcavoy	plars: make world? I was going to use make-kpkg to build it.
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11:24	hollis	jimix: I was confused about "interrupts" vs "exceptions" on x86
11:24	hollis	jimix: interrupts are not enabled before calling the C handler, of course
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11:42	jimix	hollis: whew
11:50	jimix	hollis: so two things come to mind. 1) if we want a timer interrupt in HV we should use DEC rather than HDEC. 2) if we do _not_ want timers we can just set it high +'ve so we never get it.
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12:30	riel	oh crud
12:30	riel	this isn't right at all
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12:31	riel	how can HYPERVISOR_update_va_mapping() fail only when the xenU host runs mount ?
12:31	riel	and work fine with the earlier processes
12:31	riel	in do_no_page -> do_anonymous_page, even
12:41	matta-lt	uh....
12:43	riel	Failed update VA mapping: bf9e1f48, 03696067, 00000000
12:43	riel	------------[ cut here ]------------
12:43	riel	kernel BUG at include/asm-xen/hypervisor.h:484!
12:43	riel	...
12:43	riel	EIP is at do_anonymous_page+0x1df/0x220
12:43	riel	...
12:43	riel	Call Trace:
12:43	riel	[<c0159570>] do_no_page+0x200/0x3c0
12:43	riel	...
12:43	matta-lt	this is a current unstable?
12:43	riel	it's the same xen code that worked in fedora kernel 1226
12:43	matta-lt	oh
12:43	matta-lt	weird
12:44	riel	pulled up to the current upstream kernel (2.6.12-rc2)
12:44	riel	but no changes in this code since kernel 1225 or so
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13:07	hebutterworth	\| I posted a question earlier about xend requirements for clean shutdown of driver domains.
13:07	hebutterworth	\| Not sure if anyone is thinking about it.
13:07	hebutterworth	\| Anyway, it turns out that the xend file controller.py has a number of bugs which prevent clean shutdown of driver domains.
13:07	hebutterworth	\| I have it working now.
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13:24	aliguori	reil: i was having the same message occur.. it turned out to be a grant table issue
13:24	aliguori	riel: seems logical too that it occurs only at mount
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13:42	riel	aliguori: oh ok
13:42	riel	aliguori: strange that it didn't happen before
13:42	riel	aliguori: also, how can the "grant tabled" memory cause an oops in the page fault path ?
13:42		* riel will try a blind upgrade - that does often help ;)
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13:51	aliguori	riel: i'm not sure.. i've not looked at the grant table stuff much at all
13:51	aliguori	it could be coincidence
13:52	riel	quite possibly
13:52	riel	I'll just go for the random upgrade ;)
13:52		* riel & bk pull
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14:51	smcavoy	hello. I have xen installed on sarge (from experimental). I compiled a kernel from 2.6.10 patched with the kernel-patch package. when I try to start xen after booting the new kernel I get an error:
14:51	smcavoy	ERROR: Could not obtain handle on privileged command interface (2 = No such file or directory)
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14:51	smcavoy	I get that when I run xend start (/etc/init.d/xend start exits right away)
14:52	smcavoy	any ideas what I might be missing?
14:52	aliguori	smcavoy: are you not starting it as root?
14:52	smcavoy	aliguori: I am root when I run it
14:56	plars	smcavoy: are you sure you're booted into the xen kernel?
14:56	plars	smcavoy: what does uname -a say?
14:57	smcavoy	Linux xen0 2.6.10-xen #1 SMP Thu Apr 14 12:14:28 EDT 2005 i686 GNU/Linux
14:57	smcavoy	plars
14:57	plars	does /proc/xen/privcmd exist?
14:57	smcavoy	plars: I compiled the kernel with make-kpkg after applying the patch to the system (the debian kernel-patch from experimental)
14:58	plars	smcavoy: not familiar with doing it that way personally
14:58	smcavoy	plars: no. I searched /proc for any mention of xen.
14:58	smcavoy	plars: so it sounds like I am not running a xen kernel then
14:58	eigood	the init script checks whether that file exists, and exits before starting python if it doesn't
14:58	eigood	so, that file does exist
14:59	plars	it looks like you're running a xen kernel, but possibly you didn't get everything patched in
14:59	eigood	did you enable privledged operations in the kernel config?
14:59	aliguori	yeah
14:59	plars	it could look that way and all you got is the toplevel makefile change for extraversion
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14:59	aliguori	it sounds like you're using a domU kernel in dom0
15:00	plars	eh, possibly
15:00	plars	actually
15:00	smcavoy	aliguori: that could be it then.
15:00	plars	it should say xen0
15:00	plars	not just xen
15:00	plars	where'd you get this patch from?
15:00	smcavoy	debian experimental
15:00	aliguori	sounds like the patch you got was for a domU kernel.. modify the config to make sure you have privileged ops enabled
15:00	plars	smcavoy: might want to try just downloading one of the nightly tarballs and building it
15:01	eigood	ther is no such thing as a dom0 or domU patch
15:01	eigood	they are the same thing.
15:01	aliguori	see
15:01	eigood	plars: no
15:01	eigood	the patch works
15:01	aliguori	eigood: well, the configs going to be different then
15:01	smcavoy	eigood: should the debian kernel patch have added any options to config interface?
15:01	aliguori	you cannot use the same exact kernel from dom[0U]
15:01	eigood	of course, but that has nothing to do with whether the patch is wrong
15:01	eigood	smcavoy: make menuconfig ARCH=xen
15:02	eigood	aliguori: actually, you can boot a dom0 kernel in a domU setup
15:02	plars	eigood: didn't say the patch was wrong, I just don't personally know
15:02	eigood	smcavoy: I'm the debian xen maintainer, btw
15:02	plars	unless he's trying to test the patch specifically, I meant it might be easier just to use the tarball
15:02	plars	ah, good :)
15:02	plars	he's the one you want to talk to then :)
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15:02	smcavoy	excellent :)
15:02	eigood	hmm.
15:02	eigood	maybe I better hide
15:02	plars	heh
15:04	smcavoy	eigood: your patch is for debian's 2.6.10 only, right?
15:04	eigood	no
15:05	aliguori	eigood: you can boot, but that doesn't make it useful :-)
15:05	eigood	I take kernel-source-2.6.10, unapply kernel-patch-2.6.10-debian, then overlay the xen sparse tree, and diff against pristine 2.6.10
15:05	eigood	aliguori: it works fine
15:05	eigood	can't do dom0 stuff, of course, but it works as a domU kernel no prob
15:05	eigood	it actually means you don't have to compile 2 kernels
15:07	aliguori	eigood: if you've got PRIVILEGED_GUEST enabled, you're going to do some things differently
15:07	aliguori	i'm not surprised it still works
15:07	aliguori	but i wouldn't be surprised if it broke at some point
15:08	eigood	we don't do that normally; just happened once accidentally
15:10	aliguori	ahh
15:10	aliguori	eigood: so what has been the debian's communities reaction to xen?
15:11	aliguori	eigood: what do they want the most?
15:13	eigood	they seem to like the packages
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20:33	rene-	is there anyway i can balloon domain-0 above what grubs dom0_mem?
20:33	rene-	or alternatively, can i use something liek dom0_mem=75%
20:33	rene-	liek==like
20:33	rene-	reason being, i need to install xen0 on 300 odd servers
20:34	rene-	with all of them have different amounts of memory
20:34	rene-	and im probably going to be using a static grub menu.lst
20:48	---	User: *** surriel is now known as riel
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---	Log	closed Fri Apr 15 00:00:59 2005