[v3,0/8] xen/events: bug fixes and some diagnostic aids

The first four patches are fixes for XSA-332. The avoid WARN splats
and a performance issue with interdomain events.

Patches 5 and 6 are some additions to event handling in order to add
some per pv-device statistics to sysfs and the ability to have a per
backend device spurious event delay control.

Patches 7 and 8 are minor fixes I had lying around.

Juergen Gross (8):
  xen/events: reset affinity of 2-level event when tearing it down
  xen/events: don't unmask an event channel when an eoi is pending
  xen/events: avoid handling the same event on two cpus at the same time
  xen/netback: fix spurious event detection for common event case
  xen/events: link interdomain events to associated xenbus device
  xen/events: add per-xenbus device event statistics and settings
  xen/evtchn: use smp barriers for user event ring
  xen/evtchn: use READ/WRITE_ONCE() for accessing ring indices

 .../ABI/testing/sysfs-devices-xenbus          |  41 ++++
 drivers/block/xen-blkback/xenbus.c            |   2 +-
 drivers/net/xen-netback/interface.c           |  24 ++-
 drivers/xen/events/events_2l.c                |  22 +-
 drivers/xen/events/events_base.c              | 199 +++++++++++++-----
 drivers/xen/events/events_fifo.c              |   7 -
 drivers/xen/events/events_internal.h          |  14 +-
 drivers/xen/evtchn.c                          |  29 ++-
 drivers/xen/pvcalls-back.c                    |   4 +-
 drivers/xen/xen-pciback/xenbus.c              |   2 +-
 drivers/xen/xen-scsiback.c                    |   2 +-
 drivers/xen/xenbus/xenbus_probe.c             |  66 ++++++
 include/xen/events.h                          |   7 +-
 include/xen/xenbus.h                          |   7 +
 14 files changed, 327 insertions(+), 99 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-devices-xenbus

On 2/19/21 10:40 AM, Juergen Gross wrote:
> The first four patches are fixes for XSA-332. The avoid WARN splats
> and a performance issue with interdomain events.
>
> Patches 5 and 6 are some additions to event handling in order to add
> some per pv-device statistics to sysfs and the ability to have a per
> backend device spurious event delay control.
>
> Patches 7 and 8 are minor fixes I had lying around.
>
> Juergen Gross (8):
>   xen/events: reset affinity of 2-level event when tearing it down
>   xen/events: don't unmask an event channel when an eoi is pending
>   xen/events: avoid handling the same event on two cpus at the same time
>   xen/netback: fix spurious event detection for common event case
>   xen/events: link interdomain events to associated xenbus device
>   xen/events: add per-xenbus device event statistics and settings
>   xen/evtchn: use smp barriers for user event ring
>   xen/evtchn: use READ/WRITE_ONCE() for accessing ring indices
>

I am going to pick up the last 3 patches since Ross appears to be having some issues with #2 (and 4 and 5 went in via netdev tree)


-boris