RE: [Xen-devel] tsc_mode == 1 and hvm guests

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

> On Mon, 10 May 2010, Dan Magenheimer wrote:
> > Is it an objective for hybrid VMs to work on 4.0.1?
> > I think the fix only is required for hybrid VM's
> > and the rest is cleanup.  Is that correct, Stefano?
> 
> it is required to use VIRQ_TIMER on HVM, an hybrid VM would work anyway
> falling back to the emulated timer.

OK, so not even required for hybrid.

> Also I believe that migrating to a guest that has a different tsc rate
> was broken (on HVM) before my patch.

I'm sure I tested this last December and it worked properly, though
I haven't tested it recently.  Could you confirm that it was
broken in 4.0.0 (without your patch)?

Keir, if you are putting all of the hybrid VM patches
into 4.0.1, then this should go in as well.  If not,
please hold off until we confirm there was a fix (and
I don't have multiple machines free to test it right now,
so if Stefano confirms it was broken in 4.0.0, I'm
OK with the fix).

Thanks!
Dan


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