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KVM: arm64: selftests: Fix thread migration in arch_timer_edge_cases

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arch_timer_edge_cases tries to migrate itself across host cpus. Before
the first test, it migrates to cpu 0 by setting up an affinity mask with
only bit 0 set. After that it looks for the next possible cpu in the
current affinity mask which still has only bit 0 set. So there is no
migration at all.

Fix this by reading the default mask at start and use this to find
the next cpu in each iteration.

Signed-off-by: Sebastian Ott <sebott@redhat.com>
Link: https://lore.kernel.org/r/20250605103613.14544-3-sebott@redhat.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Sebastian Ott 2025-06-05 12:36:11 +02:00 committed by Marc Zyngier
parent 9a9864fd09
commit 050632ae65
1 changed files with 5 additions and 3 deletions
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8
tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c
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@ -849,17 +849,17 @@ static void guest_code(enum arch_timer timer)
GUEST_DONE();
}
static cpu_set_t default_cpuset;
static uint32_t next_pcpu(void)
{
uint32_t max = get_nprocs();
uint32_t cur = sched_getcpu();
uint32_t next = cur;
cpu_set_t cpuset;
cpu_set_t cpuset = default_cpuset;
TEST_ASSERT(max > 1, "Need at least two physical cpus");
sched_getaffinity(0, sizeof(cpuset), &cpuset);
do {
next = (next + 1) % CPU_SETSIZE;
} while (!CPU_ISSET(next, &cpuset));
@ -1046,6 +1046,8 @@ int main(int argc, char *argv[])
if (!parse_args(argc, argv))
exit(KSFT_SKIP);
sched_getaffinity(0, sizeof(default_cpuset), &default_cpuset);
if (test_args.test_virtual) {
test_vm_create(&vm, &vcpu, VIRTUAL);
test_run(vm, vcpu);