[PATCH 0/4] xen: domain-tracked allocations, and fault injection

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

This was not the christmas hacking project that I was planning to do, but it
has had some exciting results.

After some discussion on an earlier thread, Tamas has successfully got fuzzing
of Xen working via kfx, and this series is a prototype for providing better
testing infrastructure.

And to prove a point, this series has already found a memory leak in ARM's
dom0less smoke test.

>From https://gitlab.com/xen-project/people/andyhhp/xen/-/jobs/929518792

  (XEN) *** Serial input to DOM0 (type 'CTRL-a' three times to switch input)
  (XEN) Freed 328kB init memory.
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER4
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER8
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER12
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER16
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER20
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER24
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER28
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER32
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER0
  (XEN) physdev.c:16:d0v0 PHYSDEVOP cmd=25: not implemented
  (XEN) physdev.c:16:d0v0 PHYSDEVOP cmd=15: not implemented
  (XEN) physdev.c:16:d0v0 PHYSDEVOP cmd=15: not implemented
  (XEN)
  (XEN) ****************************************
  (XEN) Panic on CPU 0:
  (XEN) d1 has 2 outstanding heap allocations
  (XEN) ****************************************
  (XEN)
  (XEN) Reboot in five seconds...

For some reason, neither of the evtchn default memory allocations are freed,
but it's not clear why d1 shut down to being with.  Stefano - any ideas?

Andrew Cooper (4):
  xen/dmalloc: Introduce dmalloc() APIs
  xen/evtchn: Switch to dmalloc
  xen/domctl: Introduce fault_ttl
  tools/misc: Test for fault injection

 tools/misc/.gitignore       |  1 +
 tools/misc/Makefile         |  5 ++++
 tools/misc/xen-fault-ttl.c  | 56 +++++++++++++++++++++++++++++++++++++++++++++
 xen/common/Makefile         |  1 +
 xen/common/dmalloc.c        | 25 ++++++++++++++++++++
 xen/common/domain.c         | 14 ++++++++++--
 xen/common/event_channel.c  | 14 ++++++------
 xen/include/public/domctl.h |  1 +
 xen/include/xen/dmalloc.h   | 29 +++++++++++++++++++++++
 xen/include/xen/sched.h     |  3 +++
 10 files changed, 140 insertions(+), 9 deletions(-)
 create mode 100644 tools/misc/xen-fault-ttl.c
 create mode 100644 xen/common/dmalloc.c
 create mode 100644 xen/include/xen/dmalloc.h

-- 
2.11.0