On 12 January 2015 at 21:06, Alexander Graf <ag...@suse.de> wrote: > > > On 12.01.15 21:08, Peter Maydell wrote: >> On 12 January 2015 at 17:38, Alexander Graf <ag...@suse.de> wrote: >>> I'd prefer to keep things as easy as we humanly can for now. Then add >>> MSI. And if we then realize that we still need 4 rather than 1 shared >>> interrupt lines we can still change it :) >> >> Except that that would be a breaking change, so I would prefer >> to think ahead where possible; at some point there will come >> a time when we really can't make breaking changes to this >> board any more... > > Works for me, then we stay at a single interrupt line. The only reason > we have 4 in PCI is that back in the day you could have non-sharing PCI > devices that were essentially ISA ones.
Well, also your typical small system probably doesn't have more than 4 PCI slots and so 4 IRQs is enough to give them each one. Most small VMs probably won't have more than four PCI devices either... -- PMM
