On Tue, Nov 08, 2011 at 08:51:38PM +1030, Rusty Russell wrote: > On Tue, 8 Nov 2011 08:32:50 +0200, "Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote: > > On Tue, Nov 08, 2011 at 10:23:33AM +1030, Rusty Russell wrote: > > > Even so, should we just use the PCI cap list, and have each > > > cap entry just contain a BIR & offset? > > > > > > Thanks, > > > Rusty. > > > > And size :) > > I say, Rusty, did you see my patch? That's what it's doing, > > I also addressed the issue that with KVM on x86, PIO is faster > > than MMIO so we need to use it for notifications/isr. > > Faster? Really? Why? I think, because it doesn't need to be emulated to get the address and the value. There are so many ways on x86 to do memory access, you need a lot of code to figure out what's going on. > Were the ppc guys right that's it's obsolescent? For PCI - surely not. PCI Express spec tries to discourage its usage. But support is there even in Express. > Because PIO is going to be ugly AFAICT for every non-x86 platform. > > Cheers, > Rusty. > So we should make the BAR MMIO on non-x86 host, PIO on x86. Guest should just map and use what it's given. -- MST -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
