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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
> 

  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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