On Tue, Oct 27, 2015 at 3:48 PM, Christian Borntraeger
<borntrae...@de.ibm.com> wrote:
> This is an RFC to check if I am on the right track.  There
> are some attempts to unify the dma ops (Christoph) as well
> as some attempts to make virtio use the dma API (Andy).
> At todays discussion at the kernel summit, we concluded that
> we want to use the same code on all platforms, whereever
> possible, so having a dummy dma_op might be the easiest
> solution to keep virtio-ccw as similar as possible to
> virtio-pci. Andy Lutomirski will rework his patchset to
> unconditionally use the dma ops.  We will also need a
> compatibility quirk for powerpc to bypass the iommu mappings
> on older QEMU version (which translates to all versions as
> of today) and per device, e.g.  via device tree.  Ben
> Herrenschmidt will look into that.

The combination of these patches plus my series don't link for me
unless I enable PCI.  Would s390 need to select HAS_DMA from VIRTIO or
something similar?

Also, is it possible to use QEMU to emulate an s390x?  Even just:

qemu-system-s390x -M s390-ccw-virtio

exits immediately.  (I build from QEMU git today.)  I don't know what
options to pass to get -M s390 to do anything useful, and AFAICT it's
considered deprecated.


To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Reply via email to