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KVM: selftests: Don't fall over in mmu_stress_test when only one CPU is present

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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>
This commit is contained in:
Brendan Jackman 2025-10-07 19:12:31 +00:00 committed by Sean Christopherson
parent 211ddde082
commit b146b289f7
1 changed files with 3 additions and 1 deletions
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4
tools/testing/selftests/kvm/mmu_stress_test.c
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@ -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[])