On Wednesday 05 November 2008 09:14:20 Hollis Blanchard wrote: > Hi Rusty, I'm using a patch that changes the Linux base page size to > 64K. (This is actually pretty common in ppc64 world, but I happen to be > trying it on ppc32.) > > I'm seeing a problem with virtio. I think at least part of it can be > explained by qemu's TARGET_PAGE_BITS==12, and the guest's > PAGE_SHIFT==16. The guest allocates the queue, then passes the pfn (pa > > >> PAGE_SHIFT) to the virtio backend (vp_find_vq()). The backend then > > calculates the pa as pfn << TARGET_PAGE_BITS. > > I have to run right now, but quickly changing qemu TARGET_PAGE_BITS to > 16 got me a little further but still didn't work. Any thoughts? I see Anthony hardwired page size into the queue activation ABI for virtio_pci. I think that this should be an actual 4096 (or 12) rather than depending on guest page size: virtio_pci.c:247: iowrite32(virt_to_phys(info->queue) >> PAGE_SHIFT, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN); Anthony? Cheers, Rusty. -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
