[RFC PATCH V3 0/5] Hi:

Jason Wang
2018-12-29T12:46:51Z

This series tries to access virtqueue metadata through kernel virtual
address instead of copy_user() friends since they had too much
overheads like checks, spec barriers or even hardware feature
toggling.

Test shows about 24% improvement on TX PPS. It should benefit other
cases as well.

Changes from V2:
- fix buggy range overlapping check
- tear down MMU notifier during vhost ioctl to make sure invalidation
request can read metadata userspace address and vq size without
holding vq mutex.
Changes from V1:
- instead of pinning pages, use MMU notifier to invalidate vmaps and
remap duing metadata prefetch
- fix build warning on MIPS

Jason Wang (5):
vhost: generalize adding used elem
vhost: fine grain userspace memory accessors
vhost: rename vq_iotlb_prefetch() to vq_meta_prefetch()
vhost: introduce helpers to get the size of metadata area
vhost: access vq metadata through kernel virtual address

drivers/vhost/net.c | 4 +-
drivers/vhost/vhost.c | 416 +++++++++++++++++++++++++++++++++++++-----
drivers/vhost/vhost.h | 15 +-
3 files changed, 384 insertions(+), 51 deletions(-)

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2.17.1