| --- | Log | opened Thu Feb 22 00:00:57 2007 |
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| 03:57 | <stephan> | brendan: I have found some of your checkpoint patches for xen, very interesting, I will have a closer look at it |
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| 07:02 | <logbot> | anyone knows where to find xen virtual appliances ? like wmware provide ? |
| 07:09 | <murb> | logbot: I'm not sure anyone has created any. |
| 07:09 | <murb> | there are certainly ready to run demo CDs. |
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| 07:15 | <logbot> | murb: thanks ;) |
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| 07:57 | <otavio> | Hello folks. I'm having a domU loading problem. It gets stuck on [2007-02-22 11:56:34 xend 2644] DEBUG (__init__:1072) hotplugStatusCallback /local/domain/0/backend/vif/4/0/hot |
| 07:57 | <otavio> | plug-status |
| 07:57 | <otavio> | Any tip? |
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| 10:40 | <logbot> | anyone knows where to change xvc0 to tty1 in dom0 xen conf ? |
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| 11:05 | <stephan> | hi, does anyone knows the cause of ctxt.user_regs.edx being 0 in suspend mode? I want to find out the mfn of the start_info page to map it. |
| 11:14 | <hollisb> | rharper: 970's large page size is in fact 16MB |
| 11:15 | <hollisb> | rharper: I'm not sure if that's something Xen should enforce during ballooning though |
| 11:17 | <brendan> | don't think I've ever seen edx 0 after the suspend hypercall. |
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| 11:21 | <stephan> | brendan mysterious ... |
| 11:24 | <stephan> | to suspend a domain i use xc_domain_shutdown(xc_handle, domid, SHUTDOWN_suspend), right? |
| 11:26 | <brendan> | I don't remember perfectly at the moment, but I think what's supposed to happen is you write 'suspend' to the domain's control/shutdown entry in xenstore, firing a watch in the guest kernel that lets it set up for suspend, including writing the suspend record into edx. |
| 11:26 | <brendan> | I can't remember what xc_domain_shutdown would do |
| 11:26 | <brendan> | it may do that |
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| 11:29 | <stephan> | Ah, ok, I forgot that. |
| 11:35 | <brendan> | what exactly are you building btw? |
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| 11:41 | <stephan> | I want to rollback the state of domain to a previous state very fast. |
| 11:43 | <stephan> | and between two checkpoints I only want to save the differences between them, to get checkpoints also very fast |
| 11:43 | <brendan> | I am also intending to do that :) |
| 11:44 | <brendan> | what's your approach to device handling? |
| 11:44 | <brendan> | are you going to run in shadow mode continuously? |
| --- | Log | closed Thu Feb 22 11:44:32 2007 |
| --- | Log | opened Thu Feb 22 11:44:34 2007 |
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| 11:45 | <brendan> | your rollback sounds like it might be very handy for backward debugging |
| 11:45 | <stephan> | at the moment I have no approach to handle devices, that the problem for now |
| 11:45 | <brendan> | ah. |
| 11:46 | <stephan> | shadow mode is always on |
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| 11:48 | <stephan> | something like debugging, to be concrete I want to inject faults |
| 11:50 | <stephan> | btw. I have no disk, my system in domU runs in a ramdisk |
| 11:51 | <stephan> | ok, thats not really true, the os in domU is initially read from a readonly disk |
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| 12:32 | <stephan> | brendan ok, suspended the domain the right way. When I try to resume it, the os in domU immediately crashes. (ebx == ecx == deadbeef) |
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| 12:45 | <stephan> | I assume the domU kernel should also prepared for that, so I have to build the right kernel |
| 12:59 | <brendan> | stephan: you should probably read my checkpoint patches again fairly closely :) |
| 13:00 | <brendan> | domU is probably crashing because it turns console/store mfns to pfn, but doesn't turn them back |
| 13:00 | <brendan> | But with unstable, you can just write 1 into eax before resuming to have the domU fix itself up |
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| 13:15 | <zamf> | Hi, I am new here. I have two questions. |
| 13:15 | <zamf> | 1. will gdb server give me debug information from domU kernel? |
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| 13:16 | <zamf> | 2. what happens when you do an arping "any_host" from a domU? are you able to send multiple probes? |
| 13:16 | <zamf> | I can only send one. |
| 13:16 | <zamf> | Thanks |
| 13:17 | <brendan> | xen comes with a gdbserver that can debug a domU kernel |
| 13:19 | <zamf> | Thank you, I was just installing it now hoping to debug a send_fake_arp error in netfront.c |
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| 17:04 | <JefeWORK> | I started a domain with xm create -c, now I want to detach the psuedo-serial console. How do I do that? |
| 17:07 | <hollisb> | ^] |
| 17:07 | <hollisb> | (like telnet) |
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| 17:12 | <JefeWORK> | Sweet. Thanks. |
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| 17:17 | <riel> | don't try telnet from inside a xen console |
| 17:17 | <riel> | you won't be able to escape from that telnet :) |
| 17:18 | <murb> | riel: i have a shell wrapper somewhere that looks up the pty in xenstore and connects a screen to it, problem solved :-) |
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| 18:55 | <icblenke> | you know, that'd probably be a better solution than spawning a xenconsole in screen. |
| 18:55 | [~] | icblenke tries it. |
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| 19:01 | <icblenke> | screen `xenstore-read /local/domain/1/console/tty` |
| 19:01 | <icblenke> | sure enough. |
| 19:02 | <Shaun2222> | i wrote a patched for xenconsole that gives the pty ownership of the customer and then xenconsole if run as the user trys to attach to his console... |
| 19:02 | <Shaun2222> | works great so far.. |
| 19:03 | <Shaun2222> | also a symlink of the pty is added to /home/user/console |
| 19:05 | <Shaun2222> | i suck at C and Python, but ideally it would be nice to have a pty_uid option in the config so that when the ptys are created that they are set to that uid/gid |
| 19:15 | <icblenke> | what's more fun: the pty doesn't start up immediately. xenconsole just keeps retrying until the pty shows up. |
| 19:16 | <icblenke> | so, yeah, you'd really want to patch xenconsoled to do that as soon as it creates the pty. |
| 19:18 | <icblenke> | I'd be very hesitant to give a customer a shell on my dom0. |
| 19:18 | <tonyb_> | icblenke: but you can give them an ssh that will only run one command, and lt it do the work. |
| 19:19 | <tonyb_> | icblenke: I do that with mercurial, so I can give people commit access without letting them play with the machine. |
| 19:20 | |-| | aliguori [~anthony@cpe-70-112-17-156.austin.res.rr.com] has joined #xen |
| 19:22 | |-| | agrif_away changed nick to agriffis |
| 19:24 | <icblenke> | sure, until someone realizes that they can stack overflow your one command and work themselves into a nice exploit. |
| 19:25 | <icblenke> | sure, you can lock down a dom0 with selinux, etc, there are always ways to mitigate the risk. |
| 19:51 | |-| | aliguori [~anthony@cpe-70-112-17-156.austin.res.rr.com] has quit [Quit: Leaving] |
| 19:58 | <movement> | you seem to be presuming that dom0 is secure against a malicious domU. That's far from clear right now. |
| 20:01 | [~] | brendan has been having fun crashing xen in the shadow page table code today |
| 20:02 | |-| | ahs3 changed nick to ahs3_away |
| 21:38 | <surriel> | movement: herbert found a lot of problems in his security audit - those have all been fixed now, but I'm convinced there must be more |
| 21:38 | |-| | sputhenp [~sputhenp@202.80.58.210] has joined #xen |
| 22:05 | |-| | g8se [~geoffc@sdcarl02.strategicdata.com.au] has joined #xen |
| 22:06 | <g8se> | I'm new to xen. Can someone tell me what the /var/lib/xen/save/* files are for? (using Debian xen package) |
| 22:26 | |-| | agriffis changed nick to agrif_away |
| 22:37 | |-| | jimix [~jimix@74.12.104.18] has quit [Quit: jimix] |
| 22:58 | |-| | VS_ChanLog [~stats@ns.theshore.net] has left #xen [Rotating Logs] |
| 22:58 | |-| | VS_ChanLog [~stats@ns.theshore.net] has joined #xen |
| 22:58 | <g8se> | I've just setup a new server I'm going to run xen on. I only gave the dom0s root file system 1G of space, and it filled up quicker than I thought it would. Part of the reason is big files in /var/lib/xen/save. But I don't know what these files are, and how much space I should allow for them |
| 23:46 | |-| | gerrit [~gerrit@c-67-160-146-170.hsd1.or.comcast.net] has quit [Ping timeout: 480 seconds] |
| --- | Log | closed Fri Feb 23 00:00:45 2007 |