KVM: selftests: Start at iteration 0 instead of -1

Start at iteration 0 instead of -1 to avoid having to initialize
vcpu_last_completed_iteration when setting up vCPU threads. This
simplifies the next commit where we move vCPU thread initialization
out to a common helper.

No functional change intended.

Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20211111001257.1446428-2-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/tools/testing/selftests/kvm/access_tracking_perf_test.c b/tools/testing/selftests/kvm/access_tracking_perf_test.c
index 5364a2ed7c68133cb6d07f5ebdf769954b23d640..7f25a06e19c9e6e1623da1e5df39dc7292fd43a4 100644 (file)
--- a/tools/testing/selftests/kvm/access_tracking_perf_test.c
+++ b/tools/testing/selftests/kvm/access_tracking_perf_test.c
@@ -47,7 +47,7 @@
 #include "guest_modes.h"
 
 /* Global variable used to synchronize all of the vCPU threads. */
-static int iteration = -1;
+static int iteration;
 
 /* Defines what vCPU threads should do during a given iteration. */
 static enum {
@@ -220,7 +220,7 @@ static void *vcpu_thread_main(void *arg)
        struct perf_test_vcpu_args *vcpu_args = arg;
        struct kvm_vm *vm = perf_test_args.vm;
        int vcpu_id = vcpu_args->vcpu_id;
-       int current_iteration = -1;
+       int current_iteration = 0;
 
        while (spin_wait_for_next_iteration(&current_iteration)) {
                switch (READ_ONCE(iteration_work)) {
@@ -303,11 +303,9 @@ static pthread_t *create_vcpu_threads(int vcpus)
        vcpu_threads = malloc(vcpus * sizeof(vcpu_threads[0]));
        TEST_ASSERT(vcpu_threads, "Failed to allocate vcpu_threads.");
 
-       for (i = 0; i < vcpus; i++) {
-               vcpu_last_completed_iteration[i] = iteration;
+       for (i = 0; i < vcpus; i++)
                pthread_create(&vcpu_threads[i], NULL, vcpu_thread_main,
                               &perf_test_args.vcpu_args[i]);
-       }
 
        return vcpu_threads;
 }