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

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Message-ID: <20160201212457.GA9915@citrix.com>
Date:	Mon, 1 Feb 2016 21:24:57 +0000
From:	Wei Liu <wei.liu2@...rix.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	David Vrabel <david.vrabel@...rix.com>,
	linux-s390 <linux-s390@...r.kernel.org>,
	<sparclinux@...r.kernel.org>, Joerg Roedel <jroedel@...e.de>,
	KVM <kvm@...r.kernel.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Linux Virtualization" <virtualization@...ts.linux-foundation.org>,
	"Christian Borntraeger" <borntraeger@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andy Lutomirski <luto@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	<xen-devel@...ts.xenproject.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Christoph Hellwig <hch@....de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	<wei.liu2@...rix.com>
Subject: Re: [Xen-devel] [PATCH v5 09/10] vring: Use the DMA API on Xen

On Sun, Jan 31, 2016 at 10:09:07PM +0200, Michael S. Tsirkin wrote:
> 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@...nel.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.
> 

Yes, they can.

When virtio-pci is used virtio device is just yet another pci device
emulated by QEMU.

Wei.

> -- 
> MST
> 
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