Hi Jean,
On 10/8/20 7:15 PM, Jean-Philippe Brucker wrote:
> This series adds support for VFIO endpoints to virtio-iommu.
>
> Versions 1 to 9 were posted by Bharat Bhushan, but I am taking over for
> now since he doesn't have much time to spend on it. Thanks again Bharat
> for the work!
>
> Two major changes since [v9]:
>
> * Don't use per-endoint page_size_mask properties. Instead keep a global
> page size for the virtio-iommu device, updated when adding a VFIO
> endpoint. Reject hotplug if the page size is incompatible.
>
> * Try to make the MAP/UNMAP paths more efficient, by keeping track of
> memory region within the endpoint structure.
>
> More testing would be appreciated, since I can only test using a software
> model as host at the moment. But it does seem to hold well with PCIe
> hotplug/unplug, and pass-through to guest userspace, which are no mean
> feat.
I tested vhost migration and the following configurations:
host 4K- guest 4K: vhost, vfio, vfio hotplug
host 64K - guest 64K: vhost, vfio, vfio hotplug
host 4K - guest 64K: vhost, vfio, vfio hoplug
All those configs worked for me. I haven't noticed any isse with those.
Thanks
Eric
>
> Note that one page size combination is not supported: host 64kB guest
> 4kB cannot work, because the host IOMMU driver will automatically pick
> 64kB pages which prevents mapping at a smaller granule. Supporting this
> case would require introducing a page size negotiation mechanism from
> the guest all the way to the host IOMMU driver. Possible, but not
> planned at the moment.
>
> [v9] https://lore.kernel.org/qemu-devel/20200323084617.1782-1-bbhushan2@marvell.com/
>
> Bharat Bhushan (7):
> virtio-iommu: Add memory notifiers for map/unmap
> virtio-iommu: Call memory notifiers in attach/detach
> virtio-iommu: Add replay() memory region callback
> virtio-iommu: Add notify_flag_changed() memory region callback
> memory: Add interface to set iommu page size mask
> vfio: Set IOMMU page size as per host supported page size
> virtio-iommu: Set supported page size mask
>
> Jean-Philippe Brucker (3):
> virtio-iommu: Fix virtio_iommu_mr()
> virtio-iommu: Store memory region in endpoint struct
> vfio: Don't issue full 2^64 unmap
>
> include/exec/memory.h | 26 +++++
> hw/vfio/common.c | 19 ++++
> hw/virtio/virtio-iommu.c | 204 ++++++++++++++++++++++++++++++++++++++-
> softmmu/memory.c | 13 +++
> hw/virtio/trace-events | 5 +
> 5 files changed, 265 insertions(+), 2 deletions(-)
>