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KVM: selftests: Add kvm_sched_getaffinity() wrapper and convert users

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Add and use a KVM wrapper for the sched_getaffinity() syscall so that
selftests don't need to manually assert that the syscall succeeded.

Note, some tests didn't actually assert success, but they all obviously
rely on the syscall to succeed.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Josh Hilke <jrhilke@google.com>
[sean: massage changelog]
Link: https://patch.msgid.link/20260626213534.3866178-17-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Josh Hilke 2026-06-26 14:35:29 -07:00 committed by Sean Christopherson
parent 4512b27766
commit 76703ca0cb
6 changed files with 8 additions and 13 deletions
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2
tools/testing/selftests/kvm/arch_timer.c
View File

@ -85,7 +85,7 @@ static u32 test_get_pcpu(void)
cpu_set_t online_cpuset;
nproc_conf = get_nprocs_conf();
sched_getaffinity(0, sizeof(cpu_set_t), &online_cpuset);
kvm_sched_getaffinity(0, sizeof(cpu_set_t), &online_cpuset);
/* Randomly find an available pCPU to place a vCPU on */
do {

2
tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c
View File

@ -1039,7 +1039,7 @@ int main(int argc, char *argv[])
if (!parse_args(argc, argv))
exit(KSFT_SKIP);
sched_getaffinity(0, sizeof(default_cpuset), &default_cpuset);
kvm_sched_getaffinity(0, sizeof(default_cpuset), &default_cpuset);
set_counter_defaults();
if (test_args.test_virtual) {

2
tools/testing/selftests/kvm/include/kvm_syscalls.h
View File

@ -12,6 +12,7 @@
#include <sys/mman.h>
#include <sys/syscall.h>
#include <sched.h>
#include <test_util.h>
#define MAP_ARGS0(m,...)
@ -93,6 +94,7 @@ __KVM_SYSCALL_DEFINE(close, 1, int, fd);
__KVM_SYSCALL_DEFINE(fallocate, 4, int, fd, int, mode, loff_t, offset, loff_t, len);
__KVM_SYSCALL_DEFINE(ftruncate, 2, unsigned int, fd, off_t, length);
__KVM_SYSCALL_DEFINE(madvise, 3, void *, addr, size_t, length, int, advice);
__KVM_SYSCALL_DEFINE(sched_getaffinity, 3, pid_t, pid, size_t, cpusetsize, cpu_set_t *, mask);
#define kvm_free_fd(fd) \
do { \

5
tools/testing/selftests/kvm/lib/kvm_util.c
View File

@ -674,13 +674,12 @@ void kvm_parse_vcpu_pinning(const char *pcpus_string, u32 vcpu_to_pcpu[],
cpu_set_t allowed_mask;
char *cpu, *cpu_list;
char delim[2] = ",";
int i, r;
int i;
cpu_list = strdup(pcpus_string);
TEST_ASSERT(cpu_list, "strdup() allocation failed.");
r = sched_getaffinity(0, sizeof(allowed_mask), &allowed_mask);
TEST_ASSERT(!r, "sched_getaffinity() failed");
kvm_sched_getaffinity(0, sizeof(allowed_mask), &allowed_mask);
cpu = strtok(cpu_list, delim);

6
tools/testing/selftests/kvm/mmu_stress_test.c
View File

@ -255,11 +255,7 @@ static void rendezvous_with_vcpus(struct timespec *time, const char *name)
static void calc_default_nr_vcpus(void)
{
cpu_set_t possible_mask;
int r;
r = sched_getaffinity(0, sizeof(possible_mask), &possible_mask);
TEST_ASSERT(!r, "sched_getaffinity failed, errno = %d (%s)",
errno, strerror(errno));
kvm_sched_getaffinity(0, sizeof(possible_mask), &possible_mask);
nr_vcpus = CPU_COUNT(&possible_mask);
TEST_ASSERT(nr_vcpus > 0, "Uh, no CPUs?");

4
tools/testing/selftests/kvm/rseq_test.c
View File

@ -226,9 +226,7 @@ int main(int argc, char *argv[])
}
}
r = sched_getaffinity(0, sizeof(possible_mask), &possible_mask);
TEST_ASSERT(!r, "sched_getaffinity failed, errno = %d (%s)", errno,
strerror(errno));
kvm_sched_getaffinity(0, sizeof(possible_mask), &possible_mask);
calc_min_max_cpu();