[Qemu-devel] [PATCH RFC 0/2] virt bare-metal payload infrastructure with atomic test case

[Alexander Spyridakis <a.spyridakis@virtualopensystems.com>]

This series implements a bare-metal test payload for the ARM and AARCH64 virt
machine models. With the new direction of TCG to finally get multi-threaded
capabilities, simple and easily deployed tests are needed, to reproduce race
conditions and intuitively debug QEMU's TCG internals.

The goal of the series is to provide an easy way to create SMP guest test cases
with minimal initialization. In its current state the provided features are,
SMP functionality through PSCI calls, a simple spinlock test-case, and
a minimal printf implementation based on the multiboot test. Parts of this
payload have been also tested with normal hosts, as well as KVM guests.

For the example spinlock test, racing errors could not be reproduced in
the default single-threaded TCG, even with a non-atomic lock. In KVM the
expected behaviour of no errors with regular locks, and some errors with
a non-atomic lock was observed. Next steps are to test multi-threaded TCG
with this kind of payloads, extend the infrastructure to more complex and
sensitive test cases, as well as support different architectures.

This work has been sponsored by Huawei Technologies Dusseldorf GmbH.

Alexander Spyridakis (2):
  atomic-test: Implement ARM and AARCH64 basic bare-metal infrastructure
  atomic-test: Add spinlock test case

 tests/atomic-test/Makefile  |  66 +++++++++++++++++++
 tests/atomic-test/helpers.c | 105 +++++++++++++++++++++++++++++
 tests/atomic-test/helpers.h |  48 ++++++++++++++
 tests/atomic-test/link.ld.S |  19 ++++++
 tests/atomic-test/main.c    |  65 ++++++++++++++++++
 tests/atomic-test/printf.c  | 157 ++++++++++++++++++++++++++++++++++++++++++++
 tests/atomic-test/start.S   |  54 +++++++++++++++
 7 files changed, 514 insertions(+)
 create mode 100644 tests/atomic-test/Makefile
 create mode 100644 tests/atomic-test/helpers.c
 create mode 100644 tests/atomic-test/helpers.h
 create mode 100644 tests/atomic-test/link.ld.S
 create mode 100644 tests/atomic-test/main.c
 create mode 100644 tests/atomic-test/printf.c
 create mode 100644 tests/atomic-test/start.S

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2.1.4