1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * kvm_create_max_vcpus 4 * 5 * Copyright (C) 2019, Google LLC. 6 * 7 * Test for KVM_CAP_MAX_VCPUS and KVM_CAP_MAX_VCPU_ID. 8 */ 9 10 #define _GNU_SOURCE /* for program_invocation_short_name */ 11 #include <fcntl.h> 12 #include <stdio.h> 13 #include <stdlib.h> 14 #include <string.h> 15 16 #include "test_util.h" 17 18 #include "kvm_util.h" 19 #include "asm/kvm.h" 20 #include "linux/kvm.h" 21 22 void test_vcpu_creation(int first_vcpu_id, int num_vcpus) 23 { 24 struct kvm_vm *vm; 25 int i; 26 27 printf("Testing creating %d vCPUs, with IDs %d...%d.\n", 28 num_vcpus, first_vcpu_id, first_vcpu_id + num_vcpus - 1); 29 30 vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR); 31 32 for (i = 0; i < num_vcpus; i++) { 33 int vcpu_id = first_vcpu_id + i; 34 35 /* This asserts that the vCPU was created. */ 36 vm_vcpu_add(vm, vcpu_id); 37 } 38 39 kvm_vm_free(vm); 40 } 41 42 int main(int argc, char *argv[]) 43 { 44 int kvm_max_vcpu_id = kvm_check_cap(KVM_CAP_MAX_VCPU_ID); 45 int kvm_max_vcpus = kvm_check_cap(KVM_CAP_MAX_VCPUS); 46 47 printf("KVM_CAP_MAX_VCPU_ID: %d\n", kvm_max_vcpu_id); 48 printf("KVM_CAP_MAX_VCPUS: %d\n", kvm_max_vcpus); 49 50 /* 51 * Upstream KVM prior to 4.8 does not support KVM_CAP_MAX_VCPU_ID. 52 * Userspace is supposed to use KVM_CAP_MAX_VCPUS as the maximum ID 53 * in this case. 54 */ 55 if (!kvm_max_vcpu_id) 56 kvm_max_vcpu_id = kvm_max_vcpus; 57 58 TEST_ASSERT(kvm_max_vcpu_id >= kvm_max_vcpus, 59 "KVM_MAX_VCPU_ID (%d) must be at least as large as KVM_MAX_VCPUS (%d).", 60 kvm_max_vcpu_id, kvm_max_vcpus); 61 62 test_vcpu_creation(0, kvm_max_vcpus); 63 64 if (kvm_max_vcpu_id > kvm_max_vcpus) 65 test_vcpu_creation( 66 kvm_max_vcpu_id - kvm_max_vcpus, kvm_max_vcpus); 67 68 return 0; 69 } 70