On Mon, May 24, 2010 at 10:13:40PM +0200, Jan Kiszka wrote: > From: Jan Kiszka <jan.kis...@siemens.com> > > This allows to communicate potential IRQ coalescing during delivery from > the sink back to the source. Targets that support IRQ coalescing > workarounds need to register handlers that return the appropriate > QEMU_IRQ_* code, and they have to propergate the code across all IRQ > redirections. If the IRQ source receives a QEMU_IRQ_COALESCED, it can > apply its workaround. If multiple sinks exist, the source may only > consider an IRQ coalesced if all other sinks either report > QEMU_IRQ_COALESCED as well or QEMU_IRQ_MASKED. > Well, almost two years passed since this approach was proposed first time[1] ;). Back then it generated bunch of nonsensical comments about real hardware not working this way, so the hack that we have now was introduce to overcome this resistance. I hope enough time passed for people to gain some sense and the approach will be adopted this time. Really this should have been done two year ago.
[1] http://lists.nongnu.org/archive/html/qemu-devel/2008-06/msg00757.html -- Gleb.