From: Jason Wang <jasowang@redhat.com>
To: Tiwei Bie <tiwei.bie@intel.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 16:31:31 +0800 [thread overview]
Message-ID: <cc288a52-dc5e-1a59-6219-8835c898ea73@redhat.com> (raw)
In-Reply-To: <20190927080410.GA22568@___>
On 2019/9/27 下午4:04, Tiwei Bie wrote:
> 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.
I see.
Thanks for the confirmation.
>
>
>> Thanks
>>
next prev parent reply other threads:[~2019-09-27 8:31 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-26 4:54 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
2019-09-27 8:31 ` Jason Wang [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=cc288a52-dc5e-1a59-6219-8835c898ea73@redhat.com \
--to=jasowang@redhat.com \
--cc=alex.williamson@redhat.com \
--cc=cunming.liang@intel.com \
--cc=dan.daly@intel.com \
--cc=kvm@vger.kernel.org \
--cc=lingshan.zhu@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=maxime.coquelin@redhat.com \
--cc=mst@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=tiwei.bie@intel.com \
--cc=virtualization@lists.linux-foundation.org \
--cc=zhihong.wang@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®