Re: KVM, AMD & Interrupts

[Matthew Hall <matt-Etm38r6YSMlqcVXhcSD7Ah2eb7JE58TQ@public.gmane.org>]

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Joerg Roedel wrote:
> I didn't follow your discussion about the problem in the #kvm channel.
> Could you provide more information about the problem itself and about
> your test environment? If I am able to reproduce the problem, we may be
> able to fix it.

Sure.

My host is a Dell SC1435, with 2 dual core Opteron 2212 HE's @2GHz. 
There's 4Gb memory and a 120Gb Sata disk (sata_svw). The host is running 
   FC6 x86_64 with 'kernel-2.6.19-1.2906.fc7' (2.6.20-rc4 from fc7 
devel) and kvm-12.
(The fc kernel comes with the kvm drivers from an earlier version, i've 
deleted these and have been testing bith the trunk and release kvm code).

The symptoms I saw were that the guest was not able to access any hd* 
devices 'properly'.
The local boot iso images (I tried the fc6 installer and some live-cd's) 
booted the kernel, but when linux attempted to enumerate the hd devices 
(before init) it stalled and eventually printed errors like 'hda: lost 
interrupt' and 'drive ready seek command failed' et al.

I got to the point of turning on the debug messages from qemu/hw/ide.c 
(DEBUG_IDE*).
At the point where the guest stalled (just after printing the CHS of 
hda) the host printed 'ide: CMD=91' (then there was a significant pause 
before anything else was printed). The guest then prints 'hda: lost 
interrupt' and the next pause was just after 'ide: CMD=10' (it then 
carries on like this until I give up hope and ctrl-c qemu). I've 
attached the debug output from that test.


The box is not live atm - so I have carte blanche to run any tests 
should you not be able to reproduce this yourselves.


Thanks,
Matt

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