On Tue, Aug 03, 2010 at 03:37:14PM +0300, Gleb Natapov wrote: > On Tue, Aug 03, 2010 at 01:10:00PM +0100, Richard W.M. Jones wrote: > > I can't see anything about this in the kernel changelog. Can you > > point me to the commit or the key phrase to look for? > > > 7972995b0c346de76 Thanks - I see. > > Also, what's the point of making in/out "more correct" when they we > > know we're talking to qemu (eg. from the CPUID) and we know it already > > worked fine before with qemu? > > > Qemu has nothing to do with that. ins/outs didn't worked correctly for > some situation. They didn't work at all if destination/source memory > was MMIO (didn't work as in hang vcpu IIRC and this is security risk). > Direction flag wasn't handled at all (if it was set instruction injected > #GP into a gust). It didn't check that memory it writes to is shadowed > in which case special action should be taken. It didn't delivered events > during long string operations. May be more. Unfortunately adding all that > makes emulation much slower. I already implemented some speedups, and > more is possible, but we will not be able to get to previous string io speed > which was our upper limit. Thanks for the explanation. I'll repost my "DMA"-like fw-cfg patch once I've rebased it and done some more testing. This huge regression for a common operation (implementing -initrd) needs to be solved without using inb/rep ins. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming blog: http://rwmj.wordpress.com Fedora now supports 80 OCaml packages (the OPEN alternative to F#) http://cocan.org/getting_started_with_ocaml_on_red_hat_and_fedora -- 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
