[PATCH v5 16/21] KVM: selftests: Add kvm_sched_getaffinity() wrapper and convert users

[Josh Hilke]

Add a KVM wrapper for the sched_getaffinity syscall named
kvm_sched_getaffinity(). Convert existing users of sched_getaffinity to
use the new wrapper.

This helper will be used in a future change in the KVM IRQ test to
migrate vCPU threads.

No functional changes intended.

Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Josh Hilke <jrhilke@xxxxxxxxxx>
---
 tools/testing/selftests/kvm/arch_timer.c                  | 2 +-
 tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c | 2 +-
 tools/testing/selftests/kvm/include/kvm_syscalls.h        | 2 ++
 tools/testing/selftests/kvm/lib/kvm_util.c                | 5 ++---
 tools/testing/selftests/kvm/mmu_stress_test.c             | 6 +-----
 tools/testing/selftests/kvm/rseq_test.c                   | 4 +---
 6 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/tools/testing/selftests/kvm/arch_timer.c b/tools/testing/selftests/kvm/arch_timer.c
index 90c475a61b22..f8b02597897b 100644
--- a/tools/testing/selftests/kvm/arch_timer.c
+++ b/tools/testing/selftests/kvm/arch_timer.c
@@ -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 {
diff --git a/tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c b/tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c
index f7625eb711d6..d9c9377a6325 100644
--- a/tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c
+++ b/tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c
@@ -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) {
diff --git a/tools/testing/selftests/kvm/include/kvm_syscalls.h b/tools/testing/selftests/kvm/include/kvm_syscalls.h
index e4731741373e..b02a860b5680 100644
--- a/tools/testing/selftests/kvm/include/kvm_syscalls.h
+++ b/tools/testing/selftests/kvm/include/kvm_syscalls.h
@@ -10,6 +10,7 @@
 #include <linux/mman.h>
 
 #include <sys/mman.h>
+#include <sched.h>
 #include <sys/syscall.h>
 
 #include <test_util.h>
@@ -93,5 +94,6 @@ __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);
 
 #endif /* SELFTEST_KVM_SYSCALLS_H */
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 2d24d8db86b1..0089d4543f5e 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -668,13 +668,12 @@ 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);
 
diff --git a/tools/testing/selftests/kvm/mmu_stress_test.c b/tools/testing/selftests/kvm/mmu_stress_test.c
index 473ef4c0ea9f..3d5f33a63b2b 100644
--- a/tools/testing/selftests/kvm/mmu_stress_test.c
+++ b/tools/testing/selftests/kvm/mmu_stress_test.c
@@ -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?");
diff --git a/tools/testing/selftests/kvm/rseq_test.c b/tools/testing/selftests/kvm/rseq_test.c
index 6510fbfd64f1..557e393c223b 100644
--- a/tools/testing/selftests/kvm/rseq_test.c
+++ b/tools/testing/selftests/kvm/rseq_test.c
@@ -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();
 
-- 
2.54.0.1032.g2f8565e1d1-goog