On Fri, Aug 22, 2008 at 09:37:16PM +0300, Avi Kivity wrote: > > Actually, with direct-mmio we bypass QEMU and get a nice boost in > > performance, and it should be possible to bypass QEMU for (most) > > PIO's too. > > Since there is no pio remapping, there's no way to ensure there's a > free pio range where the guest maps its ports.
True, and we also need to trap pio's for things like configuration space accesses that the host needs to know about, such as BAR re-mappings. Hence my (parenthetical) comment with regards to "most". It's not at all clear that the gain will be worth the complexity to decide which pio's to trap and which to let through directly. Cheers, Muli -- Workshop on I/O Virtualization (WIOV '08) Co-located with OSDI '08, Dec 2008, San Diego, CA http://www.usenix.org/wiov08 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
