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Re: [Xen-users] Advantages of HVM vs. paravirtualization in aLinux-only

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Subject: Re: [Xen-users] Advantages of HVM vs. paravirtualization in aLinux-only enviroment?
From: Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Date: Tue, 29 Apr 2008 19:55:27 +0100
Cc: "Jamie J. Begin" <begin@xxxxxxxxxxxxxxx>
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> Thanks for the reply; at least I know I'm on the right track.  However, it
> doesn't look like permissive mode actually solved my problem.
> When I try to reboot dom0, it switches to runlevel 6 and the xen init.d
> script attempts to pause the Asterisk domU.

bzzzzzzzzzzzzzt!  The mention of "Pause" rings alarm bells for me.  I did 
think that the Xen init scripts didn't actually do a suspend on a domain with 
passed-through PCI devices (or at least that Xend wouldn't allow it) but I 
could be wrong.  Still, if it manages to suspend or pause a domain with PCI 
passthrough then some "interesting" things might conceivably happen.

IIRC it's possible to configure some of the behaviour of the init script, so 
it might be possible to persuade it to not do whatever unfortunate behaviours 
it's currently trying, either by modifying the script directly or possibly by 
tweaking an option on /etc/sysconfig.


> It's at that point I get an 
> "hda: interrupt lost" on the physical console. SSH become inaccessible and
> eventually the system pukes up a bunch of ext3 and RAID controller related
> errors and freezes.  I have to physically power cycle the box to get it
> back up.
> Any suggestions?  This is a new Dell PowerEdge 1950 with a PERC SATA RAID 1
> array, running CentOS 5.1 (2.6.18-53.1.14.el5xen) in both the dom0 and
> domU. The PCI device that's being passed-through to the domU is a Digium
> AEX800 (which is actually a PCIe version of Digium's PCI-based TDM800P).
> lspci output is:
> 0b:08.0 Ethernet controller: Digium, Inc. Unknown device 8002 (rev 11)
>         Subsystem: Digium, Inc. Unknown device 8002
>         Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
> Stepping- SERR- FastB2B-
>         Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
> <TAbort- <MAbort- >SERR- <PERR-
>         Interrupt: pin A routed to IRQ 16
>         Region 0: I/O ports at dc00 [disabled] [size=256]
>         Region 1: Memory at fc7dfc00 (32-bit, non-prefetchable) [disabled]
> [size=1K]
>         Expansion ROM at fc7e0000 [disabled] [size=128K]
>         Capabilities: [c0] Power Management version 2
>                 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
> PME(D0+,D1+,D2+,D3hot+,D3cold-)
>                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-
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