Re: [Xen-devel] [PATCH v5 09/10] vring: Use the DMA API on Xen

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Jan 29, 2016 at 10:34:59AM +0000, David Vrabel wrote:
> On 29/01/16 02:31, Andy Lutomirski wrote:
> > Signed-off-by: Andy Lutomirski <luto@kernel.org>
> > ---
> >  drivers/virtio/virtio_ring.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> > index c169c6444637..305c05cc249a 100644
> > --- a/drivers/virtio/virtio_ring.c
> > +++ b/drivers/virtio/virtio_ring.c
> > @@ -47,6 +47,18 @@
> >  
> >  static bool vring_use_dma_api(void)
> >  {
> > +#if defined(CONFIG_X86) && defined(CONFIG_XEN)
> > +	/*
> > +	 * In theory, it's possible to have a buggy QEMU-supposed
> > +	 * emulated Q35 IOMMU and Xen enabled at the same time.  On
> > +	 * such a configuration, virtio has never worked and will
> > +	 * not work without an even larger kludge.  Instead, enable
> > +	 * the DMA API if we're a Xen guest, which at least allows
> > +	 * all of the sensible Xen configurations to work correctly.
> > +	 */
> > +	return static_cpu_has(X86_FEATURE_XENPV);
> 
> You want:
> 
>     if (xen_domain())
>         return true;
> 
> Without the #if so we use the DMA API for all types of Xen guest on all
> architectures.
> 
> David

I doubt HVM domains can have virtio devices.

-- 
MST