linux-kernel - [PATCH v1 10/18] KVM: selftests/tsc_scaling

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Date:   Mon, 24 Oct 2022 19:34:37 +0800
From:   Wei Wang <wei.w.wang@...el.com>
To:     seanjc@...gle.com, pbonzini@...hat.com
Cc:     dmatlack@...gle.com, vipinsh@...gle.com, ajones@...tanamicro.com,
        eric.auger@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Wei Wang <wei.w.wang@...el.com>
Subject: [PATCH v1 10/18] KVM: selftests/tsc_scaling_sync: vcpu related code consolidation

Remove the unnecessary definition of the vcpu_threads[] array, as
it has beend included in the kvm_vcpu struct. Use the helper functions
to create and join the vcpu threads.

Signed-off-by: Wei Wang <wei.w.wang@...el.com>
---
 .../selftests/kvm/x86_64/tsc_scaling_sync.c   | 25 ++++---------------
 1 file changed, 5 insertions(+), 20 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86_64/tsc_scaling_sync.c b/tools/testing/selftests/kvm/x86_64/tsc_scaling_sync.c
index 47139aab7408..34a8beef42b6 100644
--- a/tools/testing/selftests/kvm/x86_64/tsc_scaling_sync.c
+++ b/tools/testing/selftests/kvm/x86_64/tsc_scaling_sync.c
@@ -15,7 +15,6 @@
 #include <time.h>
 #include <sched.h>
 #include <signal.h>
-#include <pthread.h>
 
 #define NR_TEST_VCPUS 20
 
@@ -44,18 +43,15 @@ static void guest_code(void)
 }
 
 
-static void *run_vcpu(void *_cpu_nr)
+static void *run_vcpu(void *data)
 {
-	unsigned long vcpu_id = (unsigned long)_cpu_nr;
+	struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 	unsigned long failures = 0;
 	static bool first_cpu_done;
-	struct kvm_vcpu *vcpu;
 
 	/* The kernel is fine, but vm_vcpu_add() needs locking */
 	pthread_spin_lock(&create_lock);
 
-	vcpu = vm_vcpu_add(vm, vcpu_id, guest_code);
-
 	if (!first_cpu_done) {
 		first_cpu_done = true;
 		vcpu_set_msr(vcpu, MSR_IA32_TSC, TEST_TSC_OFFSET);
@@ -95,23 +91,12 @@ int main(int argc, char *argv[])
 {
 	TEST_REQUIRE(kvm_has_cap(KVM_CAP_VM_TSC_CONTROL));
 
-	vm = vm_create(NR_TEST_VCPUS);
+	vm = vm_create_with_vcpus(NR_TEST_VCPUS, guest_code, NULL);
 	vm_ioctl(vm, KVM_SET_TSC_KHZ, (void *) TEST_TSC_KHZ);
 
 	pthread_spin_init(&create_lock, PTHREAD_PROCESS_PRIVATE);
-	pthread_t cpu_threads[NR_TEST_VCPUS];
-	unsigned long cpu;
-	for (cpu = 0; cpu < NR_TEST_VCPUS; cpu++)
-		pthread_create(&cpu_threads[cpu], NULL, run_vcpu, (void *)cpu);
-
-	unsigned long failures = 0;
-	for (cpu = 0; cpu < NR_TEST_VCPUS; cpu++) {
-		void *this_cpu_failures;
-		pthread_join(cpu_threads[cpu], &this_cpu_failures);
-		failures += (unsigned long)this_cpu_failures;
-	}
-
-	TEST_ASSERT(!failures, "TSC sync failed");
+	vm_vcpu_threads_create(vm, run_vcpu, 0);
+	vm_vcpu_threads_join(vm);
 	pthread_spin_destroy(&create_lock);
 	kvm_vm_free(vm);
 	return 0;
-- 
2.27.0