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Re: [Qemu-devel] Adding an IPMI BMC device to KVM

From: Anthony Liguori
Subject: Re: [Qemu-devel] Adding an IPMI BMC device to KVM
Date: Sun, 06 May 2012 09:35:10 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120329 Thunderbird/11.0.1

On 05/06/2012 08:11 AM, Avi Kivity wrote:
(copied qemu-devel)

On 05/04/2012 10:10 PM, Corey Minyard wrote:

Either way, is this interesting for including into KVM?

Not kvm, but certainly it would make a good addition to qemu, which kvm
then uses.

Does anyone have any
opinions on the possible ways to implement this?

My preference would be the second alternative.  The issue you raise is a
good one.  There are two ways we can approach it:

- have the management system intercept IPMI requests, start up a qemu
instance (if it's down), and let it handle the event.
- change the whole system to keep a running qemu even when the guest is
down.  This is a much larger change; it involves reducing the memory
footprint to almost nothing when the guest is down (deallocating memory
and threads) so it doesn't impact guest density, but it allows for other
minor features such as wake-on-LAN and RTC alarm wakeups.

libvirt is essentially the BMC for a virtual guest. I would suggest looking at implementing an IPMI interface to libvirt and exposing it to the guest through a USB RNDIS device.


Anthony Liguori

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