XEN 5.5.0 and clflush

Kevin Day toasty at dragondata.com
Tue Sep 22 17:28:10 UTC 2009

On Tue, Sep 22, 2009 at 8:10 AM, Kostik Belousov <kostikbel at gmail.com>wrote:

> I think I will have to disable CLFLUSH support for intel CPUs when
> self-snoop
> is not reported.
That's the kinda weird part about this though... It's not triggering an
Invalid Instruction, but a GPF. Looking at AMD's description of how CLFLUSH
is supposed to work, I don't see why it's faulting with what looks like a
valid address.

While this is probably far outside the scope of what their entry-level
support techs will understand, I can try raising this as a bug with Citrix
under our support contract if you're confident that this is broken on Xen's

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