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Re: [Xen-ia64-devel] Re: Transparent virtualization and serial port.
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,
> 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,
Alex Williamson HP Open Source & Linux Org.
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