Hi Alex, 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. > > RFC->v1: > * 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. > > Thanks, > > Alex > > --- > > 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.auger@xxxxxxxxxx> Thanks Eric
