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Re: [Qemu-devel] [PATCH v1 0/3] intel_iommu: support scalable mode
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v1 0/3] intel_iommu: support scalable mode |
Date: |
Mon, 4 Mar 2019 22:23:34 -0500 |
On Tue, Mar 05, 2019 at 11:09:34AM +0800, Peter Xu wrote:
> On Tue, Mar 05, 2019 at 10:34:52AM +0800, Yi Sun wrote:
> > Intel vt-d rev3.0 [1] introduces a new translation mode called
> > 'scalable mode', which enables PASID-granular translations for
> > first level, second level, nested and pass-through modes. The
> > vt-d scalable mode is the key ingredient to enable Scalable I/O
> > Virtualization (Scalable IOV) [2] [3], which allows sharing a
> > device in minimal possible granularity (ADI - Assignable Device
> > Interface). As a result, previous Extended Context (ECS) mode
> > is deprecated (no production ever implements ECS).
> >
> > This patch set emulates a minimal capability set of VT-d scalable
> > mode, equivalent to what is available in VT-d legacy mode today:
> > 1. Scalable mode root entry, context entry and PASID table
> > 2. Seconds level translation under scalable mode
> > 3. Queued invalidation (with 256 bits descriptor)
> > 4. Pass-through mode
> >
> > Corresponding intel-iommu driver support will be included in
> > kernel 5.0:
> > https://www.spinics.net/lists/kernel/msg2985279.html
> >
> > We will add emulation of full scalable mode capability along with
> > guest iommu driver progress later, e.g.:
> > 1. First level translation
> > 2. Nested translation
> > 3. Per-PASID invalidation descriptors
> > 4. Page request services for handling recoverable faults
> >
> > To verify the patches, below cases were tested according to Peter Xu's
> > suggestions.
> >
> > +---------+----------------------------------------------------------------+----------------------------------------------------------------+
> > | | w/ Device Passthr
> > | w/o Device Passthr |
> > |
> > +-------------------------------+--------------------------------+-------------------------------+--------------------------------+
> > | | virtio-net-pci, vhost=on | virtio-net-pci, vhost=off
> > | virtio-net-pci, vhost=on | virtio-net-pci, vhost=off |
> > |
> > +-------------------------------+--------------------------------+-------------------------------+--------------------------------+
> > | | netperf | kernel bld | data cp| netperf | kernel bld | data
> > cp | netperf | kernel bld | data cp| netperf | kernel bld | data cp |
> >
> > +---------+-------------------------------+--------------------------------+-------------------------------+--------------------------------+
> > | Legacy | Pass | Pass | Pass | Pass | Pass | Pass
> > | Pass | Pass | Pass | Pass | Pass | Pass |
> >
> > +---------+-------------------------------+--------------------------------+-------------------------------+--------------------------------+
> > | Scalable| Pass | Pass | Pass | Pass | Pass | Pass
> > | Pass | Pass | Pass | Pass | Pass | Pass |
> >
> > +---------+-------------------------------+--------------------------------+-------------------------------+--------------------------------+
>
> Legacy vfio-pci?
>
> I've reviewed the whole series, I would assume that the maintainer
> might still test it a bit before a pull but again even before that I
> would really like to double confirm this series won't break anything.
>
> Thanks,
If that's me FYI I don't normally test with vfio either.
Yes I'd appreciate testing with that from contributor.
> --
> Peter Xu
- [Qemu-devel] [PATCH v1 0/3] intel_iommu: support scalable mode, Yi Sun, 2019/03/04
- [Qemu-devel] [PATCH v1 2/3] intel_iommu: add 256 bits qi_desc support, Yi Sun, 2019/03/04
- [Qemu-devel] [PATCH v1 3/3] intel_iommu: add scalable-mode option to make scalable mode work, Yi Sun, 2019/03/04
- [Qemu-devel] [PATCH v1 1/3] intel_iommu: scalable mode emulation, Yi Sun, 2019/03/04
- Re: [Qemu-devel] [PATCH v1 0/3] intel_iommu: support scalable mode, Peter Xu, 2019/03/04
- Re: [Qemu-devel] [PATCH v1 0/3] intel_iommu: support scalable mode,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH v1 0/3] intel_iommu: support scalable mode, Yi Sun, 2019/03/04
- Re: [Qemu-devel] [PATCH v1 0/3] intel_iommu: support scalable mode, Peter Xu, 2019/03/04
- Re: [Qemu-devel] [PATCH v1 0/3] intel_iommu: support scalable mode, Yi Sun, 2019/03/05
- Re: [Qemu-devel] [PATCH v1 0/3] intel_iommu: support scalable mode, Peter Xu, 2019/03/05
- Re: [Qemu-devel] [PATCH v1 0/3] intel_iommu: support scalable mode, Yi Sun, 2019/03/05
- Re: [Qemu-devel] [PATCH v1 0/3] intel_iommu: support scalable mode, Peter Xu, 2019/03/05