Re: [PATCH v7 0/5] VIRTIO-IOMMU probe request support and MSI bypass on ARM

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Jul 02, 2020 at 02:01:46PM +0200, Auger Eric wrote:
> Hi Michael,
> 
> On 7/2/20 1:28 PM, Michael S. Tsirkin wrote:
> > On Mon, Jun 29, 2020 at 09:03:59AM +0200, Eric Auger wrote:
> >> By default the virtio-iommu translates MSI transactions. This
> >> behavior is inherited from ARM SMMU. However the virt machine
> >> code knows where the MSI doorbells are, so we can easily
> >> declare those regions as VIRTIO_IOMMU_RESV_MEM_T_MSI. With that
> >> setting the guest iommu subsystem will not need to map MSIs.
> >> This setup will simplify the VFIO integration.
> >>
> >> In this series, the ITS or GICV2M doorbells are declared as
> >> HW MSI regions to be bypassed by the VIRTIO-IOMMU.
> >>
> >> This also paves the way to the x86 integration where the MSI
> >> region, [0xFEE00000,0xFEEFFFFF], will be exposed by the q35
> >> machine.  However this will be handled in a separate series
> >> when not-DT support gets resolved.
> > 
> > 
> > virtio things:
> > 
> > Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
> > 
> > 
> > ARM tree makes sense for this, right?
> 
> Yes I think so.
> 
> Thanks
> 
> Eric


Okay. Feel free to merge through ARM tree pls.

Reviewed-by: Michael S. Tsirkin <mst@redhat.com>

> > 
> > 
> >> Best Regards
> >>
> >> Eric
> >>
> >> This series can be found at:
> >> https://github.com/eauger/qemu/tree/v5.0.0-virtio-iommu-msi-bypass-v7
> >>
> >> History:
> >>
> >> v6 -> v7:
> >> - fix the hint message
> >> - put the assert again on probe request
> >>
> >> v5 -> v6:
> >> - do not hardcode start/end addresses of doorbells
> >> - check reserved region type on realize()
> >>
> >> v4 -> v5:
> >> - Take into account some additional comments from Markus:
> >>   - reserved region type becomes an unsigned + some comment/desc
> >>     rewording
> >>   - assert if the type is not RESERVED or MSI
> >>
> >> v3 -> v4:
> >> - collected Jean and markus's R-bs
> >> - tool into account all Markus' comments in [1/5] (except removal of
> >>   goto)
> >> - use ':' as delimitor instead of commas
> >> - add example in 4/5 commit message as suggested by Markus
> >>
> >> v2 -> v3:
> >> - Introduce VIRT_MSI_CTRL_NONE in VirtMSIControllerType
> >> - do not fill the remainder of the probe buffer
> >>
> >> v1 -> v2:
> >> - check which MSI controller is in use and advertise the
> >>   corresponding MSI doorbell
> >> - managed for both ITS and GICv2M
> >> - various fixes spotted by Peter and Jean-Philippe, see
> >>   individual logs
> >>
> >> v1: Most of those patches were respinned from
> >>   [PATCH for-5.0 v11 00/20] VIRTIO-IOMMU device
> >>   except the last one which is new
> >>
> >>
> >> Eric Auger (5):
> >>   qdev: Introduce DEFINE_PROP_RESERVED_REGION
> >>   virtio-iommu: Implement RESV_MEM probe request
> >>   virtio-iommu: Handle reserved regions in the translation process
> >>   virtio-iommu-pci: Add array of Interval properties
> >>   hw/arm/virt: Let the virtio-iommu bypass MSIs
> >>
> >>  include/exec/memory.h            |   6 ++
> >>  include/hw/arm/virt.h            |   7 ++
> >>  include/hw/qdev-properties.h     |   3 +
> >>  include/hw/virtio/virtio-iommu.h |   2 +
> >>  include/qemu/typedefs.h          |   1 +
> >>  hw/arm/virt.c                    |  30 ++++++++
> >>  hw/core/qdev-properties.c        |  89 ++++++++++++++++++++++++
> >>  hw/virtio/virtio-iommu-pci.c     |  11 +++
> >>  hw/virtio/virtio-iommu.c         | 114 +++++++++++++++++++++++++++++--
> >>  hw/virtio/trace-events           |   1 +
> >>  10 files changed, 260 insertions(+), 4 deletions(-)
> >>
> >> -- 
> >> 2.20.1
> > 
> >