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Merge tag 'for-linus-5.12b-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

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Pull more xen updates from Juergen Gross:

 - A small series for Xen event channels adding some sysfs nodes for per
   pv-device settings and statistics, and two fixes of theoretical
   problems.

 - two minor fixes (one for an unlikely error path, one for a comment).

* tag 'for-linus-5.12b-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen-front-pgdir-shbuf: don't record wrong grant handle upon error
  xen: Replace lkml.org links with lore
  xen/evtchn: use READ/WRITE_ONCE() for accessing ring indices
  xen/evtchn: use smp barriers for user event ring
  xen/events: add per-xenbus device event statistics and settings
This commit is contained in:
Linus Torvalds
2021-02-26 10:04:45 -08:00
parent d94d14008e 53f131c284
commit 5c2e7a0af2
7 changed files with 168 additions and 16 deletions
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Documentation/ABI/testing/sysfs-devices-xenbus Normal file
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What: /sys/devices/*/xenbus/event_channels
Date: February 2021
Contact: Xen Developers mailing list <xen-devel@lists.xenproject.org>
Description:
Number of Xen event channels associated with a kernel based
paravirtualized device frontend or backend.
What: /sys/devices/*/xenbus/events
Date: February 2021
Contact: Xen Developers mailing list <xen-devel@lists.xenproject.org>
Description:
Total number of Xen events received for a Xen pv device
frontend or backend.
What: /sys/devices/*/xenbus/jiffies_eoi_delayed
Date: February 2021
Contact: Xen Developers mailing list <xen-devel@lists.xenproject.org>
Description:
Summed up time in jiffies the EOI of an interrupt for a Xen
pv device has been delayed in order to avoid stalls due to
event storms. This value rising is a first sign for a rogue
other end of the pv device.
What: /sys/devices/*/xenbus/spurious_events
Date: February 2021
Contact: Xen Developers mailing list <xen-devel@lists.xenproject.org>
Description:
Number of events received for a Xen pv device which did not
require any action. Too many spurious events in a row will
trigger delayed EOI processing.
What: /sys/devices/*/xenbus/spurious_threshold
Date: February 2021
Contact: Xen Developers mailing list <xen-devel@lists.xenproject.org>
Description:
Controls the tolerated number of subsequent spurious events
before delayed EOI processing is triggered for a Xen pv
device. Default is 1. This can be modified in case the other
end of the pv device is issuing spurious events on a regular
basis and is known not to be malicious on purpose. Raising
the value for such cases can improve pv device performance.