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KVM: selftests: Randomize pCPU in steal time test

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Pin the steal time test's tasks to a random pCPU in the system instead of
hardcoding the test to always run on pCPU0 as a cheap way of increasing
test coverage, and to do the "right thing" if the parent task of the test
doesn't have pCPU0 in its CPU affinity mask.

Link: https://patch.msgid.link/20260707150706.1198541-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2026-07-07 08:07:06 -07:00
parent 3f339b70bb
commit 2351e814e1
1 changed files with 3 additions and 5 deletions
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8
tools/testing/selftests/kvm/steal_time.c
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@ -514,14 +514,12 @@ int main(int ac, char **av)
long stolen_time;
long run_delay;
bool verbose;
int i;
int i, cpu;
verbose = ac > 1 && (!strncmp(av[1], "-v", 3) || !strncmp(av[1], "--verbose", 10));
/* Set CPU affinity so we can force preemption of the VCPU */
CPU_ZERO(&cpuset);
CPU_SET(0, &cpuset);
pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
cpu = pin_self_to_any_cpu();
/* Create a VM and an identity mapped memslot for the steal time structure */
vm = vm_create_with_vcpus(NR_VCPUS, guest_code, vcpus);
@ -557,7 +555,7 @@ int main(int ac, char **av)
run_delay = get_run_delay();
pthread_create(&thread, NULL, do_steal_time, NULL);
pthread_getaffinity_np(thread, sizeof(cpuset), &cpuset);
TEST_ASSERT(CPU_COUNT(&cpuset) == 1 && CPU_ISSET(0, &cpuset),
TEST_ASSERT(CPU_COUNT(&cpuset) == 1 && CPU_ISSET(cpu, &cpuset),
"Worker failed to inherit parent's CPU affinity");
do