On 09.04.2011, at 14:14, Sasha Levin wrote: > Attempt to use mmap first for working with a disk image, if the attempt is > failed (for example, large image on a 32bit system) fallback to using > read/write.
That reminds me of an idea I had quite a while back. What if we mmap'ed a raw disk image directly into the guest's address space? This could for example be done through a virtio feature addition, keeping the disk accessible through normal virtio plus the mmap'ed part. At least in writeback mode, this should perform pretty well, as we'd save all the userspace exits. It'd basically be almost like vhost-blk :). Have you thought about trying out to implement such a feature? Alex -- 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
