The end goal of this series is to add a regression test for commit
910c57dfa4d1 ("KVM: x86: Mark target gfn of emulated atomic instruction
as dirty"), *without* polluting the common dirty_log_test.c code with
gory x86 details.
The regression test requires forcing KVM to emulate a guest atomic RMW
access, which is done via a magic instruction prefix/opcode that is
guarded by an off-by-default KVM module param.
To allow x86 to (a) detect the param, (b) shove in the unique instruction,
and (c) do all of that conditionally so that selftests doesn't test _only_
the forced emulation path, this series provides a pseudo-RNG instance for
all tests, and a new arch hook for doing "interesting" guest writes
(vcpu_arch_put_guest()).
Tested on x86 and ARM, compile tested on s390 and RISC-V.
Sean Christopherson (5):
KVM: selftests: Provide a global pseudo-RNG instance for all tests
KVM: selftests: Provide an API for getting a random bool from an RNG
KVM: selftests: Add global snapshot of
kvm_is_forced_emulation_enabled()
KVM: selftests: Add vcpu_arch_put_guest() to do writes from guest code
KVM: selftests: Randomly force emulation on x86 writes from guest code
.../selftests/kvm/dirty_log_perf_test.c | 9 ++++----
tools/testing/selftests/kvm/dirty_log_test.c | 22 ++++--------------
.../selftests/kvm/include/kvm_util_base.h | 3 +++
.../testing/selftests/kvm/include/memstress.h | 1 -
.../testing/selftests/kvm/include/test_util.h | 19 +++++++++++++++
.../kvm/include/x86_64/kvm_util_arch.h | 23 +++++++++++++++++++
tools/testing/selftests/kvm/lib/kvm_util.c | 9 ++++++++
tools/testing/selftests/kvm/lib/memstress.c | 10 ++------
.../selftests/kvm/lib/x86_64/processor.c | 3 +++
.../selftests/kvm/x86_64/pmu_counters_test.c | 3 ---
.../kvm/x86_64/userspace_msr_exit_test.c | 10 ++------
.../selftests/kvm/x86_64/xen_shinfo_test.c | 5 ++--
12 files changed, 72 insertions(+), 45 deletions(-)
base-commit: e9a2bba476c8332ed547fce485c158d03b0b9659
--
2.44.0.291.gc1ea87d7ee-goog
