Re: [Xen-ia64-devel] Re: Transparent virtualization and serial port.

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Mardi 08 AoÃt 2006 16:37, Alex Williamson a Ãcrit :
> On Tue, 2006-08-08 at 16:28 +0200, Tristan Gingold wrote:
> > Le Mardi 08 AoÃt 2006 15:27, Alex Williamson a Ãcrit :
> > > On Tue, Aug 08, 2006 at 03:20:10PM +0200, Tristan Gingold wrote:
> > > > Sorry, I completly forgot mmio ports.
> > > > How much memory is used for the mmio port.  If the granularity is
> > > > bigger than one page, it should be easy (and even easier).
> > >
> > >    Far less than a page, something on the order of 8 bytes, iirc.  It
> > > would be nice to cover them w/ something smaller than PAGE_SIZE, but
> > > PAGE_SIZE would be a good start (we might just end up preventing access
> > > to more than one port).  Thanks,
> >
> > Yes.
> > Have you any other device in the same mmio page ?
>
>    I checked a couple systems, seems it's more common than I hoped that
> there are other non-serial devices mapped into the same 16k page as the
> UARTs.  Looks like maybe if we could work on 4k boundaries we'd have a
> lot better luck.  Thanks,
HI,

sorry I forgot to reply to this mail.

If we are sure mmio devices don't share a 4KB page we could try to use this 
feature.  Xen can't do the check by itself.

Tristan.

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