[RFC PATCH kvm-unit-tests 0/4] add generic stress test

[Paolo Bonzini <pbonzini@redhat.com>]

This short series adds a generic stress test to KVM unit tests that runs a
series of

The test could grow a lot more features, including:

- wrapping the stress test with a VMX or SVM veneer which would forward
  or inject interrupts periodically

- test perf events

- do some work in the MSI handler, so that they have a chance
  of overlapping

- use PV EOI

- play with TPR and self IPIs, similar to Windows DPCs.

The configuration of the test is set individually for each VCPU on
the command line, for example:

   ./x86/run x86/chaos.flat -smp 2 \
      -append 'invtlb=1,mem=12,hz=100  hz=250,edu=1,edu_hz=53,hlt' -device edu

runs a continuous INVLPG+write test on 1<<12 pages on CPU 0, interrupted
by a 100 Hz timer tick; and keeps CPU 1 mostly idle except for 250 timer
ticks and 53 edu device interrupts per second.

For now, the test runs for an infinite time so it's not included in
unittests.cfg.  Do you think this is worth including in kvm-unit-tests,
and if so are you interested in non-x86 versions of it?  Or should the
code be as pluggable as possible to make it easier to port it?

Thanks,

Paolo

Paolo Bonzini (4):
  libcflat: add a few more runtime functions
  chaos: add generic stress test
  chaos: add timer interrupt to the workload
  chaos: add edu device interrupt to the workload

 lib/alloc.c         |   9 +-
 lib/alloc.h         |   1 +
 lib/libcflat.h      |   4 +-
 lib/string.c        |  59 +++++++++-
 lib/string.h        |   4 +
 lib/x86/processor.h |   2 +-
 x86/Makefile.x86_64 |   1 +
 x86/chaos.c         | 263 ++++++++++++++++++++++++++++++++++++++++++++
 8 files changed, 337 insertions(+), 6 deletions(-)
 create mode 100644 x86/chaos.c

-- 
2.29.2