On Tue, Oct 29, 2013 at 02:55:13PM +0000, Jan Beulich wrote: > >>> On 29.10.13 at 15:45, Konrad Rzeszutek Wilk <konrad.w...@oracle.com> > >>> wrote: > > On Tue, Oct 29, 2013 at 08:23:30AM +0000, Jan Beulich wrote: > >> >>> On 28.10.13 at 17:58, Konrad Rzeszutek Wilk <konrad.w...@oracle.com> > >> >>> wrote: > >> > On Fri, Oct 25, 2013 at 04:08:19PM -0600, Bjorn Helgaas wrote: > >> >> If you can look at PCI host bridge apertures instead of BARs, that > >> >> would solve both problems. Reassigning those apertures is > >> >> theoretically possible but is not even a gleam in our eyes yet. > >> > > >> > <nods> I think I have to have both (BARs and host bridge apertures) as > >> > when > >> > we do PCI passthrough to a guest - we might do it without a bridge. > >> > >> Why? Aren't the host bridge ranges necessarily a superset of the > >> individual devices' BARs? > > > > Yes. But when you pass in a PCI device to a PV guest you don't pass in the > > bridge. Just the PCI device itself. > > Right you are. Which means that basing the whole logic on the > PCI device BARs is likely wrong anyway, not just because it > doesn't account for other MMIO ranges.
Right, but that is OK. When you pass in a PCI device to a PV guest you only care about that specific device driver being able to access its BARs. > > Jan > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
