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xen-devel
Re: [Xen-devel] (XEN) traps.c:2430:d0 Domain attempted WRMSR 00000000c00
On Mon, Aug 15, 2011 at 01:45:11PM +0100, Jan Beulich wrote:
> >>> On 15.08.11 at 14:30, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> >>> wrote:
> > On Mon, Aug 15, 2011 at 08:40:36AM +0100, Jan Beulich wrote:
> >> >>> On 14.08.11 at 15:48, Keir Fraser <keir.xen@xxxxxxxxx> wrote:
> >> > You can specify guest_loglvl=error to turn off warning messages, but that
> >> > would turn off other messages that might actually be interesting.
> >> > Alternatively you'd have to disable the message in source code and
> >> > rebuild
> >> > the hypervisor. Possibly we should reduce this message to debug loglevel
> >> > rather than warning logelevel: I agree the message is very much not a
> >> > rarity.
> >>
> >> I tend to disagree - the kernel shouldn't really attempt these writes.
> >> One of the things addressing of which is more cumbersome in pv-ops
> >> (which I assume is in use here) than "classic" kernels.
> >
> > It might be good to find out what those calls are and see about actually
> > fixing it.
>
> These are performance monitoring MSRs, and as we seem to agree the
> whole perf subsystem is currently not usable with Xen.
I would like to see it getting usuable with Xen. Not sure if that is just
a "wish" vs a reality. The folks that published the
(http://people.cs.vt.edu/~rnikola/files/vee2011.pdf)
http://lists.xensource.com/archives/html/xen-devel/2011-05/msg01233.html
seemed to have done some work.
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