On Wed, 2011-09-28 at 12:27 -0500, Scott Wood wrote: > Why would it need to be synchronous? Even if it's asynchronous emulated > DMA, we don't want it sitting around only in a data cache that > instruction fetches won't snoop.
Except that this is exactly what happens on real HW :-) The guest will do the necessary invalidations. DMA doesn't keep the icache coherent on HW, why should it on kvm/qemu ? > It's not implemented yet in mainline for powerpc (we have something > internal that is on the backlog of things to be cleaned up and sent > out), but this is what we'd do for kvm_arch_insert_sw_breakpoint(). Yes, breakpoints do need a flash, as does the initial program load. Cheers, Ben.
