On Mon, Sep 1, 2014 at 10:39 AM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: > This fixes virtio on Xen guests as well as on any other platform > that uses virtio_pci on which physical addresses don't match bus > addresses. > > This can be tested with: > > virtme-run --xen xen --kimg arch/x86/boot/bzImage --console > > using virtme from here: > > https://git.kernel.org/cgit/utils/kernel/virtme/virtme.git > > Without these patches, the guest hangs forever. With these patches, > everything works. > Dusting off an ancient thread. Now that the dust has accumulated^Wsettled, is it worth pursuing this? I think the situation is considerably worse than it was when I originally wrote these patches: I think that QEMU now supports a nasty mode in which the guest's PCI bus appears to be behind an IOMMU but the virtio devices on that bus punch straight through that IOMMU. I have a half-hearted port to modern kernels here: https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/log/?h=virtio_ring_xen I didn't implement DMA API access for virtio_pci_modern, and I have no idea what to do about detecting whether a given virtio device honors its IOMMU or not. --Andy _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
