Re: [Xen-devel] [PATCH v15 14/19] pvh: Use PV handlers for PIO

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.11.13 at 15:57, George Dunlap <george.dunlap@xxxxxxxxxxxxx> wrote:
> @@ -566,7 +581,10 @@ int hvm_domain_initialise(struct domain *d)
>      d->arch.hvm_domain.io_handler->num_slot = 0;
>  
>      if ( is_pvh_domain(d) )
> +    {
> +        register_portio_handler(d, 0, 0xffffffff, handle_pvh_io);

Nice idea, but I'm afraid it'll need a little more than this long term
(i.e. I'm fine for this to go is as is, with the second paragraph below
address in some way): hvm_io_intercept() first tries
dpci_ioport_intercept(), and without device model I think that's not
correct. If indeed it isn't, a simple solution might be to just disallow
the registration of translated I/O port ranges for PVH guests.

The other thing here is the use of 0xffffffff: The parameter is a
size one, not an end of range. And considering that we're talking
about I/O ports, 0x10000 would seem to be the right value (or,
if taking the potential wrapping into account, 0x10003).

Jan


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