From: Tiwei Bie <tiwei.bie@intel.com>
To: Jason Wang <jasowang@redhat.com>
Cc: mst@redhat.com, alex.williamson@redhat.com,
maxime.coquelin@redhat.com, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, dan.daly@intel.com,
cunming.liang@intel.com, zhihong.wang@intel.com,
lingshan.zhu@intel.com
Subject: Re: [PATCH] vhost: introduce mdev based hardware backend
Date: Fri, 27 Sep 2019 16:04:10 +0800 [thread overview]
Message-ID: <20190927080410.GA22568@___> (raw)
In-Reply-To: <49bb0777-3761-3737-8e5b-568957f9a935@redhat.com>
On Fri, Sep 27, 2019 at 03:14:42PM +0800, Jason Wang wrote:
> On 2019/9/27 下午12:54, Tiwei Bie wrote:
> > > > +
> > > > + /*
> > > > + * In vhost-mdev, userspace should pass ring addresses
> > > > + * in guest physical addresses when IOMMU is disabled or
> > > > + * IOVAs when IOMMU is enabled.
> > > > + */
> > > A question here, consider we're using noiommu mode. If guest physical
> > > address is passed here, how can a device use that?
> > >
> > > I believe you meant "host physical address" here? And it also have the
> > > implication that the HPA should be continuous (e.g using hugetlbfs).
> > The comment is talking about the virtual IOMMU (i.e. iotlb in vhost).
> > It should be rephrased to cover the noiommu case as well. Thanks for
> > spotting this.
>
>
> So the question still, if GPA is passed how can it be used by the
> virtio-mdev device?
Sorry if I didn't make it clear..
Of course, GPA can't be passed in noiommu mode.
>
> Thanks
>
next prev parent reply other threads:[~2019-09-27 8:07 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-26 4:54 [PATCH] vhost: introduce mdev based hardware backend Tiwei Bie
2019-09-26 8:35 ` Michael S. Tsirkin
2019-09-26 13:14 ` Tiwei Bie
2019-09-26 13:26 ` Michael S. Tsirkin
2019-09-26 13:34 ` Tiwei Bie
2019-09-27 3:27 ` Jason Wang
2019-09-27 9:41 ` Michael S. Tsirkin
2019-09-27 12:17 ` Jason Wang
2019-09-27 12:46 ` Michael S. Tsirkin
2019-09-27 13:17 ` Jason Wang
2019-09-27 13:23 ` Michael S. Tsirkin
2019-09-29 7:39 ` Jason Wang
2019-09-26 14:05 ` kbuild test robot
2019-09-27 3:46 ` Jason Wang
2019-09-27 3:51 ` Jason Wang
2019-09-27 4:26 ` Tiwei Bie
2019-09-27 4:54 ` Tiwei Bie
2019-09-27 7:14 ` Jason Wang
2019-09-27 8:04 ` Tiwei Bie [this message]
2019-09-27 8:31 ` Jason Wang
2019-09-27 7:17 ` Jason Wang
2019-09-27 8:47 ` Jason Wang
2019-09-27 9:38 ` Michael S. Tsirkin
2019-09-27 12:15 ` Jason Wang
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