From: "Michael S. Tsirkin" <mst@redhat.com>
To: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Cc: iommu@lists.linux-foundation.org, kvm@vger.kernel.org,
virtualization@lists.linux-foundation.org,
virtio-dev@lists.oasis-open.org, cdall@linaro.org,
will.deacon@arm.com, robin.murphy@arm.com,
lorenzo.pieralisi@arm.com, joro@8bytes.org, jasowang@redhat.com,
alex.williamson@redhat.com, marc.zyngier@arm.com
Subject: Re: [RFC 0/3] virtio-iommu: a paravirtualized IOMMU
Date: Sat, 8 Apr 2017 00:19:22 +0300 [thread overview]
Message-ID: <20170407211922.GA23772@redhat.com> (raw)
In-Reply-To: <20170407191747.26618-1-jean-philippe.brucker@arm.com>
On Fri, Apr 07, 2017 at 08:17:44PM +0100, Jean-Philippe Brucker wrote:
> There are a number of advantages in a paravirtualized IOMMU over a full
> emulation. It is portable and could be reused on different architectures.
> It is easier to implement than a full emulation, with less state tracking.
> It might be more efficient in some cases, with less context switches to
> the host and the possibility of in-kernel emulation.
Thanks, this is very interesting. I am read to read it all, but I really
would like you to expand some more on the motivation for this work.
Productising this would be quite a bit of work. Spending just 6 lines on
motivation seems somewhat disproportionate. In particular, do you have
any specific efficiency measurements or estimates that you can share?
--
MST
next prev parent reply other threads:[~2017-04-07 21:19 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-07 19:17 [RFC 0/3] virtio-iommu: a paravirtualized IOMMU Jean-Philippe Brucker
2017-04-07 19:17 ` [RFC 1/3] virtio-iommu: firmware description of the virtual topology Jean-Philippe Brucker
2017-04-07 19:17 ` [RFC 2/3] virtio-iommu: device probing and operations Jean-Philippe Brucker
2017-04-18 10:26 ` Tian, Kevin
2017-04-18 18:45 ` Jean-Philippe Brucker
2017-04-18 18:45 ` Jean-Philippe Brucker
2017-04-21 9:02 ` Tian, Kevin
2017-04-24 15:05 ` Jean-Philippe Brucker
[not found] ` <AADFC41AFE54684AB9EE6CBC0274A5D190CB262D-0J0gbvR4kThpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2017-04-24 15:05 ` Jean-Philippe Brucker
2017-08-21 7:59 ` Tian, Kevin
2017-08-21 12:00 ` Jean-Philippe Brucker
2017-08-21 12:00 ` Jean-Philippe Brucker
2017-08-21 12:00 ` [virtio-dev] " Jean-Philippe Brucker
[not found] ` <454095c4-cae5-ad52-a459-5c9e2cce4047-5wv7dgnIgG8@public.gmane.org>
2017-08-22 6:24 ` Tian, Kevin
2017-08-22 14:19 ` Jean-Philippe Brucker
2017-08-22 14:19 ` Jean-Philippe Brucker
2017-08-22 14:19 ` [virtio-dev] " Jean-Philippe Brucker
2017-08-23 2:23 ` Tian, Kevin
2017-08-23 2:23 ` Tian, Kevin
2017-08-23 2:23 ` [virtio-dev] " Tian, Kevin
2017-08-22 6:24 ` Tian, Kevin
2017-04-18 10:26 ` Tian, Kevin
2017-04-07 19:17 ` Jean-Philippe Brucker
2017-04-07 19:17 ` [RFC 3/3] virtio-iommu: future work Jean-Philippe Brucker
2017-04-21 8:31 ` Tian, Kevin
[not found] ` <20170407191747.26618-4-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2017-04-21 8:31 ` Tian, Kevin
2017-04-24 15:05 ` Jean-Philippe Brucker
2017-04-24 15:05 ` Jean-Philippe Brucker
2017-04-26 16:24 ` Michael S. Tsirkin
2017-04-26 16:24 ` Michael S. Tsirkin
2017-04-07 19:17 ` Jean-Philippe Brucker
2017-04-07 19:23 ` [RFC PATCH linux] iommu: Add virtio-iommu driver Jean-Philippe Brucker
2017-06-16 8:48 ` [virtio-dev] " Bharat Bhushan
2017-06-16 11:36 ` Jean-Philippe Brucker
2017-06-16 11:36 ` Jean-Philippe Brucker
2017-06-16 8:48 ` Bharat Bhushan
2017-04-07 19:24 ` [RFC PATCH kvmtool 00/15] Add virtio-iommu Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 01/15] virtio: synchronize virtio-iommu headers with Linux Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 02/15] FDT: (re)introduce a dynamic phandle allocator Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 03/15] virtio: add virtio-iommu Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 04/15] Add a simple IOMMU Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 05/15] iommu: describe IOMMU topology in device-trees Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 06/15] irq: register MSI doorbell addresses Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 07/15] virtio: factor virtqueue initialization Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 08/15] virtio: add vIOMMU instance for virtio devices Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 09/15] virtio: access vring and buffers through IOMMU mappings Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 10/15] virtio-pci: translate MSIs with the virtual IOMMU Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 11/15] virtio: set VIRTIO_F_IOMMU_PLATFORM when necessary Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 12/15] vfio: add support for virtual IOMMU Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 13/15] virtio-iommu: debug via IPC Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 14/15] virtio-iommu: implement basic debug commands Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-04-07 19:24 ` [RFC PATCH kvmtool 15/15] virtio: use virtio-iommu when available Jean-Philippe Brucker
2017-04-07 19:24 ` Jean-Philippe Brucker
2017-05-22 8:26 ` [RFC PATCH kvmtool 00/15] Add virtio-iommu Bharat Bhushan
[not found] ` <20170407192455.26814-1-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2017-05-22 8:26 ` Bharat Bhushan
2017-05-22 14:01 ` Jean-Philippe Brucker
[not found] ` <AM5PR0401MB2545FADDF2A7649DF0DB68309AF80-oQ3wXcTHOqrg6d/1FbYcvI3W/0Ik+aLCnBOFsp37pqbUKgpGm//BTAC/G2K4zDHf@public.gmane.org>
2017-05-22 14:01 ` Jean-Philippe Brucker
2017-04-07 21:19 ` [RFC 0/3] virtio-iommu: a paravirtualized IOMMU Michael S. Tsirkin
2017-04-07 21:19 ` Michael S. Tsirkin [this message]
2017-04-10 18:39 ` [virtio-dev] " Jean-Philippe Brucker
2017-04-10 18:39 ` Jean-Philippe Brucker
2017-04-10 20:04 ` [virtio-dev] " Michael S. Tsirkin
2017-04-10 20:04 ` Michael S. Tsirkin
2017-04-10 2:30 ` Need information on type 2 IOMMU valmiki
2017-04-12 9:06 ` [RFC 0/3] virtio-iommu: a paravirtualized IOMMU Jason Wang
2017-04-13 8:16 ` Tian, Kevin
[not found] ` <a0920e37-a11e-784c-7d90-be6617ea7686-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-04-13 8:16 ` Tian, Kevin
[not found] ` <AADFC41AFE54684AB9EE6CBC0274A5D190CA990E-0J0gbvR4kThpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2017-04-13 13:12 ` Jean-Philippe Brucker
2017-04-13 13:12 ` Jean-Philippe Brucker
2017-04-12 9:06 ` Jason Wang
2017-04-13 8:41 ` Tian, Kevin
[not found] ` <20170407191747.26618-1-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2017-04-07 19:17 ` [RFC 1/3] virtio-iommu: firmware description of the virtual topology Jean-Philippe Brucker
[not found] ` <20170407191747.26618-2-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2017-04-18 9:51 ` Tian, Kevin
2017-04-18 18:41 ` Jean-Philippe Brucker
2017-04-21 8:43 ` Tian, Kevin
[not found] ` <AADFC41AFE54684AB9EE6CBC0274A5D190CB2570-0J0gbvR4kThpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2017-04-24 15:05 ` Jean-Philippe Brucker
2017-04-24 15:05 ` Jean-Philippe Brucker
2017-04-18 18:41 ` Jean-Philippe Brucker
2017-04-18 9:51 ` Tian, Kevin
2017-04-10 2:30 ` Need information on type 2 IOMMU valmiki
[not found] ` <1b48daab-c9e1-84d1-78a9-84d3e2001f32-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-04-10 4:19 ` Alex Williamson
2017-04-10 4:19 ` Alex Williamson
2017-04-13 8:41 ` [RFC 0/3] virtio-iommu: a paravirtualized IOMMU Tian, Kevin
2017-04-13 13:12 ` Jean-Philippe Brucker
2017-04-13 13:12 ` Jean-Philippe Brucker
2017-04-07 19:17 Jean-Philippe Brucker
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