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authorSean Christopherson <seanjc@google.com>2023-07-11 16:01:29 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2023-07-29 11:05:30 -0400
commit47d1be8a78fb587fe5a8f0873244476700171403 (patch)
tree1c9894f46fbfcc705cde90ae9d60ac46c0016fa4 /tools/testing/selftests/kvm/kvm_binary_stats_test.c
parent33b02704071b0972a62ec32516847f91cab6cb8f (diff)
KVM: selftests: Verify userspace can create "redundant" binary stats files
Verify that KVM doesn't artificially limit KVM_GET_STATS_FD to a single file per VM/vCPU. There's no known use case for getting multiple stats fds, but it should work, and more importantly creating multiple files will make it easier to test that KVM correct manages VM refcounts for stats files. Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20230711230131.648752-6-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/testing/selftests/kvm/kvm_binary_stats_test.c')
-rw-r--r--tools/testing/selftests/kvm/kvm_binary_stats_test.c25
1 files changed, 23 insertions, 2 deletions
diff --git a/tools/testing/selftests/kvm/kvm_binary_stats_test.c b/tools/testing/selftests/kvm/kvm_binary_stats_test.c
index 874fa5092551..653f10d8fb7c 100644
--- a/tools/testing/selftests/kvm/kvm_binary_stats_test.c
+++ b/tools/testing/selftests/kvm/kvm_binary_stats_test.c
@@ -185,6 +185,7 @@ static void stats_test(int stats_fd)
int main(int argc, char *argv[])
{
+ int vm_stats_fds, *vcpu_stats_fds;
int i, j;
struct kvm_vcpu **vcpus;
struct kvm_vm **vms;
@@ -217,18 +218,37 @@ int main(int argc, char *argv[])
vcpus = malloc(sizeof(struct kvm_vcpu *) * max_vm * max_vcpu);
TEST_ASSERT(vcpus, "Allocate memory for storing vCPU pointers");
+ /*
+ * Not per-VM as the array is populated, used, and invalidated within a
+ * single for-loop iteration.
+ */
+ vcpu_stats_fds = calloc(max_vm, sizeof(*vcpu_stats_fds));
+ TEST_ASSERT(vcpu_stats_fds, "Allocate memory for VM stats fds");
+
for (i = 0; i < max_vm; ++i) {
vms[i] = vm_create_barebones();
for (j = 0; j < max_vcpu; ++j)
vcpus[i * max_vcpu + j] = __vm_vcpu_add(vms[i], j);
}
- /* Check stats read for every VM and VCPU */
+ /*
+ * Check stats read for every VM and vCPU, with a variety of testcases.
+ * Note, stats_test() closes the passed in stats fd.
+ */
for (i = 0; i < max_vm; ++i) {
+ vm_stats_fds = vm_get_stats_fd(vms[i]);
+
+ /* Verify userspace can instantiate multiple stats files. */
stats_test(vm_get_stats_fd(vms[i]));
- for (j = 0; j < max_vcpu; ++j)
+ for (j = 0; j < max_vcpu; ++j) {
+ vcpu_stats_fds[j] = vcpu_get_stats_fd(vcpus[i * max_vcpu + j]);
stats_test(vcpu_get_stats_fd(vcpus[i * max_vcpu + j]));
+ }
+
+ stats_test(vm_stats_fds);
+ for (j = 0; j < max_vcpu; ++j)
+ stats_test(vcpu_stats_fds[j]);
ksft_test_result_pass("vm%i\n", i);
}
@@ -237,6 +257,7 @@ int main(int argc, char *argv[])
kvm_vm_free(vms[i]);
free(vms);
free(vcpus);
+ free(vcpu_stats_fds);
ksft_finished(); /* Print results and exit() accordingly */
}