linux-kernel - Re: [kvm-devel] 2.6.23.1-rt4 and kvm 48

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Message-ID: <4726DF66.4000000@osadl.org>
Date:	Tue, 30 Oct 2007 08:38:14 +0100
From:	Carsten Emde <Carsten.Emde@...dl.org>
To:	Avi Kivity <avi@...ranet.com>
CC:	David Brown <dmlb2000@...il.com>, kvm-devel@...ts.sourceforge.net,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [kvm-devel] 2.6.23.1-rt4 and kvm 48

Avi Kivity wrote:
> David Brown wrote:
>> I thought I'd try out the realtime patch set and it didn't work at all
>> with kvm. The console didn't dump anything and the system completely
>> locked up.
Up to now, the unmodified kvm module never worked with any RT kernel. 
This would only change, if RT patched kernels were routinely used in the 
kvm release tests which is, for the time being, not the case.

However, tglx once provided a hand-crafted kvm version that can be used 
together with a selected RT kernel -> see "Latest Stable" 
(http://www.osadl.org/Latest-Stable.latest-stable-realtime-kernel.0.html) 
realtime kernel. It is based on kernel 2.6.21.6-rt21 and kvm-28.

We used these modules to carry out a number of "proof of concept" tests 
which were very successful. The realtime capabilities of the host system 
remained unchanged irrespective of whether the kvm guest system (no 
graphics) was running or not. This was even the case while the guest 
system was booting.

We are planning to provide another "Latest Stable" realtime kernel 
within the next month or so. It will probably be based on kernel 2.6.23.

	--cbe
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