Re: [Xen-devel] [PATCH 4/5] x86/PV: remove the emulated PIT

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.01.16 at 13:32, <roger.pau@xxxxxxxxxx> wrote:
> The HVMlite series removed the initialization of the emulated PIT for PV
> guests, but the handler was still reachable, which means a PV guests can
> crash Xen if it pokes at IO ports 0x42, 0x43 or 0x61. Completely remove the
> PV PIT handler and move the PIT initialization to HVM guests only.

As said on IRC - this is needed for Dom0 to be able to drive the
PC speaker. You'll need to provide a fix for the suppressed
initialization instead, at least for Dom0. (As an aside, your patch
orphans hwdom_pit_access().)

Jan


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