diff options
| author | Brendan Jackman <jackmanb@google.com> | 2025-10-07 19:12:31 +0000 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-10-20 08:55:23 -0700 |
| commit | b146b289f759315fd27402a40bc15214515e6c45 (patch) | |
| tree | 1d4b21920d7de1d015448ec1f295f91143416ed8 | |
| parent | 211ddde0823f1442e4ad052a2f30f050145ccada (diff) | |
KVM: selftests: Don't fall over in mmu_stress_test when only one CPU is present
Running mmu_stress_test on a system with only one CPU is not a recipe for
success. However, there's no clear-cut reason why it absolutely
shouldn't work, so the test shouldn't completely reject such a platform.
At present, the *3/4 calculation will return zero on these platforms and
the test fails. So, instead just skip that calculation.
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Link: https://lore.kernel.org/r/20251007-b4-kvm-mmu-stresstest-1proc-v1-1-8c95aa0e30b6@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
| -rw-r--r-- | tools/testing/selftests/kvm/mmu_stress_test.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/testing/selftests/kvm/mmu_stress_test.c b/tools/testing/selftests/kvm/mmu_stress_test.c index 37b7e6524533..c799e0d0694f 100644 --- a/tools/testing/selftests/kvm/mmu_stress_test.c +++ b/tools/testing/selftests/kvm/mmu_stress_test.c @@ -263,8 +263,10 @@ static void calc_default_nr_vcpus(void) TEST_ASSERT(!r, "sched_getaffinity failed, errno = %d (%s)", errno, strerror(errno)); - nr_vcpus = CPU_COUNT(&possible_mask) * 3/4; + nr_vcpus = CPU_COUNT(&possible_mask); TEST_ASSERT(nr_vcpus > 0, "Uh, no CPUs?"); + if (nr_vcpus >= 2) + nr_vcpus = nr_vcpus * 3/4; } int main(int argc, char *argv[]) |