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

[Roger Pau Monnà <roger.pau@xxxxxxxxxx>]

El 13/01/16 a les 17.36, Jan Beulich ha escrit:
>>>> 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().)

Thanks for the clarification. AFAICT I can leave the usage of
hwdom_pit_access for Dom0, and completely remove PIT access for DomU, is
that right?

Roger.


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