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Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support |
Date: |
Tue, 16 May 2017 18:16:01 +0300 |
On Mon, May 15, 2017 at 01:45:28PM +0800, Jason Wang wrote:
>
>
> On 2017年05月13日 08:02, Michael S. Tsirkin wrote:
> > On Fri, May 12, 2017 at 04:21:58PM +0200, Maxime Coquelin wrote:
> > >
> > > On 05/11/2017 08:25 PM, Michael S. Tsirkin wrote:
> > > > On Thu, May 11, 2017 at 02:32:46PM +0200, Maxime Coquelin wrote:
> > > > > This patch specifies and implements the master/slave communication
> > > > > to support device IOTLB in slave.
> > > > >
> > > > > The vhost_iotlb_msg structure introduced for kernel backends is
> > > > > re-used, making the design close between the two backends.
> > > > >
> > > > > An exception is the use of the secondary channel to enable the
> > > > > slave to send IOTLB miss requests to the master.
> > > > >
> > > > > Signed-off-by: Maxime Coquelin <address@hidden>
> > > > > ---
> > > > > docs/specs/vhost-user.txt | 75
> > > > > +++++++++++++++++++++++++++++++++++++++++++++++
> > > > > hw/virtio/vhost-user.c | 31 ++++++++++++++++++++
> > > > > 2 files changed, 106 insertions(+)
> > > > >
> > > > > diff --git a/docs/specs/vhost-user.txt b/docs/specs/vhost-user.txt
> > > > > index 5fa7016..4a1f0c3 100644
> > > > > --- a/docs/specs/vhost-user.txt
> > > > > +++ b/docs/specs/vhost-user.txt
> > > > > @@ -97,6 +97,23 @@ Depending on the request type, payload can be:
> > > > > log offset: offset from start of supplied file descriptor
> > > > > where logging starts (i.e. where guest address 0 would be
> > > > > logged)
> > > > > + * An IOTLB message
> > > > > + ---------------------------------------------------------
> > > > > + | iova | size | user address | permissions flags | type |
> > > > > + ---------------------------------------------------------
> > > > > +
> > > > > + IOVA: a 64-bit guest I/O virtual address
> > > > guest -> VM
> > > Ok.
> > >
> > > > > + Size: a 64-bit size
> > > > How do you specify "all memory"? give special meaning to size 0?
> > > Good point, it does not support all memory currently.
> > > It is not vhost-user specific, but general to the vhost implementation.
> > But iommu needs it to support passthrough.
>
> Probably not, we will just pass the mappings in vhost_memory_region to
> vhost. Its memory_size is also a __u64.
>
> Thanks
That's different since that's chunks of qemu virtual memory.
IOMMU maps IOVA to GPA.
--
MST
- Re: [Qemu-devel] [PATCH 3/6] vhost: Update rings information for IOTLB earlier, (continued)
[Qemu-devel] [PATCH 2/6] vhost: rework IOTLB messaging, Maxime Coquelin, 2017/05/11
[Qemu-devel] [PATCH 4/6] vhost-user: add vhost_user to hold the chr, Maxime Coquelin, 2017/05/11
[Qemu-devel] [PATCH 5/6] vhost-user: add slave-req-fd support, Maxime Coquelin, 2017/05/11
[Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Maxime Coquelin, 2017/05/11
- Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Michael S. Tsirkin, 2017/05/11
- Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Maxime Coquelin, 2017/05/12
- Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Michael S. Tsirkin, 2017/05/12
- Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Jason Wang, 2017/05/15
- Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Jason Wang, 2017/05/16
- Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Maxime Coquelin, 2017/05/17
- Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Jason Wang, 2017/05/19
- Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Maxime Coquelin, 2017/05/19
Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Maxime Coquelin, 2017/05/17
Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Maxime Coquelin, 2017/05/16
Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Michael S. Tsirkin, 2017/05/16
Re: [Qemu-devel] [PATCH 6/6] spec/vhost-user spec: Add IOMMU support, Michael S. Tsirkin, 2017/05/17