Basic test coverage of KVM_CAP_MAX_VCPU_ID cap. This capability can be enabled before vCPU creation and only allowed to set once. if assigned vcpu id is beyond KVM_CAP_MAX_VCPU_ID capability, vCPU creation will fail. Signed-off-by: Zeng Guang <guang.zeng@xxxxxxxxx> --- This patch appends the test case to verify the KVM_CAP_MAX_VCPU_ID cap enabling mechanism introduced in IPI virtualization enabling patch. https://lore.kernel.org/lkml/20220419153155.11504-1-guang.zeng@xxxxxxxxx/ tools/testing/selftests/kvm/.gitignore | 1 + tools/testing/selftests/kvm/Makefile | 1 + .../kvm/x86_64/max_vcpuid_cap_test.c | 60 +++++++++++++++++++ 3 files changed, 62 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86_64/max_vcpuid_cap_test.c diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore index d1e8f5237469..b860dcfee920 100644 --- a/tools/testing/selftests/kvm/.gitignore +++ b/tools/testing/selftests/kvm/.gitignore @@ -22,6 +22,7 @@ /x86_64/hyperv_cpuid /x86_64/hyperv_features /x86_64/hyperv_svm_test +/x86_64/max_vcpuid_cap_test /x86_64/mmio_warning_test /x86_64/mmu_role_test /x86_64/platform_info_test diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 21c2dbd21a81..e92dc78de4d0 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -86,6 +86,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/xen_shinfo_test TEST_GEN_PROGS_x86_64 += x86_64/xen_vmcall_test TEST_GEN_PROGS_x86_64 += x86_64/sev_migrate_tests TEST_GEN_PROGS_x86_64 += x86_64/amx_test +TEST_GEN_PROGS_x86_64 += x86_64/max_vcpuid_cap_test TEST_GEN_PROGS_x86_64 += access_tracking_perf_test TEST_GEN_PROGS_x86_64 += demand_paging_test TEST_GEN_PROGS_x86_64 += dirty_log_test diff --git a/tools/testing/selftests/kvm/x86_64/max_vcpuid_cap_test.c b/tools/testing/selftests/kvm/x86_64/max_vcpuid_cap_test.c new file mode 100644 index 000000000000..3fc84efa7460 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/max_vcpuid_cap_test.c @@ -0,0 +1,60 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * maximum APIC ID capability tests + * + * Copyright (C) 2022, Intel, Inc. + * + * Tests for getting/setting maximum APIC ID capability + */ + +#include "kvm_util.h" +#include "../lib/kvm_util_internal.h" + +#define MAX_VCPU_ID 2 + +int main(int argc, char *argv[]) +{ + struct kvm_vm *vm; + struct kvm_enable_cap cap = { 0 }; + int ret; + + vm = vm_create(VM_MODE_DEFAULT, 0, O_RDWR); + + /* Get KVM_CAP_MAX_VCPU_ID cap supported in KVM */ + ret = vm_check_cap(vm, KVM_CAP_MAX_VCPU_ID); + + /* Try to set KVM_CAP_MAX_VCPU_ID beyond KVM cap */ + cap.cap = KVM_CAP_MAX_VCPU_ID; + cap.args[0] = ret + 1; + ret = ioctl(vm->fd, KVM_ENABLE_CAP, &cap); + TEST_ASSERT(ret < 0, + "Unexpected success to enable KVM_CAP_MAX_VCPU_ID" + "beyond KVM cap!\n"); + + /* Set KVM_CAP_MAX_VCPU_ID */ + cap.cap = KVM_CAP_MAX_VCPU_ID; + cap.args[0] = MAX_VCPU_ID; + ret = ioctl(vm->fd, KVM_ENABLE_CAP, &cap); + TEST_ASSERT(ret == 0, + "Unexpected failure to enable KVM_CAP_MAX_VCPU_ID!\n"); + + /* Check current KVM_CAP_MAX_VCPU_ID value */ + ret = vm_check_cap(vm, KVM_CAP_MAX_VCPU_ID); + TEST_ASSERT(ret == MAX_VCPU_ID, + "Unexpected failure to set KVM_CAP_MAX_VCPU_ID as %d\n", + MAX_VCPU_ID); + + /* Try to set KVM_CAP_MAX_VCPU_ID again */ + cap.args[0] = MAX_VCPU_ID + 1; + ret = ioctl(vm->fd, KVM_ENABLE_CAP, &cap); + TEST_ASSERT(ret < 0, + "Unexpected success to enable KVM_CAP_MAX_VCPU_ID again\n"); + + /* Create vCPU with id beyond KVM_CAP_MAX_VCPU_ID cap*/ + ret = ioctl(vm->fd, KVM_CREATE_VCPU, MAX_VCPU_ID); + TEST_ASSERT(ret < 0, + "Unexpected success in creating a vCPU with VCPU ID out of range\n"); + + kvm_vm_free(vm); + return 0; +} -- 2.27.0
