Re: [PATCH v9 4/5] KVM: selftests: Add selftest for KVM statistics data binary interface
From: Fuad Tabba <hidden>
Date: 2021-06-15 08:03:57
Also in:
kvm, kvmarm, linux-kselftest, linux-s390
Hi Jing,
+int main(int argc, char *argv[])
+{
+ int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
+ struct kvm_vm **vms;
+
+ /* Get the number of VMs and VCPUs that would be created for testing. */
+ if (argc > 1) {
+ max_vm = strtol(argv[1], NULL, 0);
+ if (max_vm <= 0)
+ max_vm = DEFAULT_NUM_VM;
+ }
+ if (argc > 2) {
+ max_vcpu = strtol(argv[2], NULL, 0);
+ if (max_vcpu <= 0)
+ max_vcpu = DEFAULT_NUM_VCPU;
+ }
+
+ /* Check the extension for binary stats */
+ ret = kvm_check_cap(KVM_CAP_BINARY_STATS_FD);
+ TEST_ASSERT(ret >= 0,
+ "Binary form statistics interface is not supported");kvm_check_cap returns the value of KVM_CHECK_EXTENSION, which is 0 if unsupported (-ERROR on an error). The assertion should be for ret > 0. Made that change locally, and tested it with various configurations (vhe, nvhe), as well as kernel versions (with and without KVM_CAP_BINARY_STATS_FD), and it passes (or fails as expected). Without that fix and with a kernel that doesn't support KVM_CAP_BINARY_STATS_FD, it passes that assertion, but fails later at vcpu_stats_test(). With that fixed: Tested-by: Fuad Tabba <redacted> #arm64 Cheers, /fuad
quoted hunk ↗ jump to hunk
+ + /* Create VMs and VCPUs */ + vms = malloc(sizeof(vms[0]) * max_vm); + TEST_ASSERT(vms, "Allocate memory for storing VM pointers"); + for (i = 0; i < max_vm; ++i) { + vms[i] = vm_create(VM_MODE_DEFAULT, + DEFAULT_GUEST_PHY_PAGES, O_RDWR); + for (j = 0; j < max_vcpu; ++j) + vm_vcpu_add(vms[i], j); + } + + /* Check stats read for every VM and VCPU */ + for (i = 0; i < max_vm; ++i) { + vm_stats_test(vms[i]); + for (j = 0; j < max_vcpu; ++j) + vcpu_stats_test(vms[i], j); + } + + for (i = 0; i < max_vm; ++i) + kvm_vm_free(vms[i]); + free(vms); + return 0; +}diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 5c70596dd1b9..83c02cb0ae1e 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c@@ -2286,3 +2286,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size) n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size); return vm_adjust_num_guest_pages(mode, n); } + +int vm_get_stats_fd(struct kvm_vm *vm) +{ + return ioctl(vm->fd, KVM_GET_STATS_FD, NULL); +} + +int vcpu_get_stats_fd(struct kvm_vm *vm, uint32_t vcpuid) +{ + struct vcpu *vcpu = vcpu_find(vm, vcpuid); + + return ioctl(vcpu->fd, KVM_GET_STATS_FD, NULL); +} --2.32.0.272.g935e593368-goog