On 28/02/18 21:45, Alex Williamson wrote:
> This is the QEMU counterpart to https://lkml.org/lkml/2018/2/28/1222
> As described in the third patch, we have a use case for taking
> advantage of existing KVM ioeventfd support for accelerating the
> MSI-ACK behavior of NVIDIA GPUs. This series adds generic
> infrastructure within vfio quirks for making use of ioeventfds and
> specifically enables it for this purpose. The first three patches
> provide a performance improvement on their own and do not depend on
> the additional acceleration added by the remainder of the patches to
> be worthwhile. The Linux header update in patch 4 is not intended
> to be a full refresh, the kernel API is not yet upstream, this is for
> testing and review purposes. The intention would be to commit the
> series in separate chunks, 1-3 once we have review consensus, 4-5 as
> RFC until the kernel API is upstream.
> * Cap the number of dynamically added ioeventfds to 10 such that
> pathological driver behavior cannot consume too many file handles.
> * Added a reset hook and cleanup mechanism to drop dynamically added
> ioeventfds on device reset.
> * Additional comments and removed info_report.
> * Folded ioeventfd infrastructure patch into usage patch, fail to
> stand on its own without setup, which requires consumers.
> Alex Williamson (5):
> vfio/quirks: Add common quirk alloc helper
> vfio/quirks: Add quirk reset callback
> vfio/quirks: ioeventfd quirk acceleration
> vfio: Update linux header
> vfio/quirks: Enable ioeventfd quirks to be handled by vfio directly
> hw/vfio/pci-quirks.c | 255
> hw/vfio/pci.c | 2
> hw/vfio/pci.h | 17 +++
> linux-headers/linux/vfio.h | 27 +++++
> 4 files changed, 272 insertions(+), 29 deletions(-)
For all patches except the yet partial linux header update,
Reviewed-by: Eric Auger <eric.au...@redhat.com>