Re: [Xen-devel] [rfc 00/18] ioemu: use devfn instead of slots as the unit for passthrough

[Simon Horman <horms@xxxxxxxxxxxx>]

On Thu, Mar 05, 2009 at 05:31:15PM +0800, Jiang, Yunhong wrote:
> xen-devel-bounces@xxxxxxxxxxxxxxxxxxx <> wrote:
> > On 05/03/2009 09:05, "Simon Horman" <horms@xxxxxxxxxxxx> wrote:
> > 
> >> * I have not accounted for MSI devices/functions at this time,
> >>   but my understanding is that they don't need a GSI at all.
> >>   So it should be just a matter of giving them a device
> >>   and making sure nothing else uses it.
> > 
> > Depending on how critical your
> > no-sharing-between-passthru-devices is, you
> > might need to be careful with this. Just because a device is MSI-capable
> > doesn't mean the guest OS will use it (I don't know how common
> > that would be
> 
> I think most OS will support a option to disable MSI, like Vista or Linux.

So it is entirely possible that MSI won't be used on an MSI-capable
function?  Is this true of SR-IOV (virtual) functions too?

-- 
Simon Horman
  VA Linux Systems Japan K.K., Sydney, Australia Satellite Office
  H: www.vergenet.net/~horms/             W: www.valinux.co.jp/en


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