167761Smsmith// SPDX-License-Identifier: GPL-2.0-only 267761Smsmith/* 367761Smsmith * kvm_create_max_vcpus 467761Smsmith * 567761Smsmith * Copyright (C) 2019, Google LLC. 667761Smsmith * 767761Smsmith * Test for KVM_CAP_MAX_VCPUS and KVM_CAP_MAX_VCPU_ID. 867761Smsmith */ 967761Smsmith 1067761Smsmith#define _GNU_SOURCE /* for program_invocation_short_name */ 1167761Smsmith#include <fcntl.h> 1267761Smsmith#include <stdio.h> 1367761Smsmith#include <stdlib.h> 1467761Smsmith#include <string.h> 1567761Smsmith#include <sys/resource.h> 1667761Smsmith 1767761Smsmith#include "test_util.h" 1867761Smsmith 1967761Smsmith#include "kvm_util.h" 2067761Smsmith#include "asm/kvm.h" 2167761Smsmith#include "linux/kvm.h" 2267761Smsmith 2367761Smsmithvoid test_vcpu_creation(int first_vcpu_id, int num_vcpus) 2467761Smsmith{ 2567761Smsmith struct kvm_vm *vm; 2667761Smsmith int i; 2767761Smsmith 2867761Smsmith pr_info("Testing creating %d vCPUs, with IDs %d...%d.\n", 2967761Smsmith num_vcpus, first_vcpu_id, first_vcpu_id + num_vcpus - 1); 3067761Smsmith 3167761Smsmith vm = vm_create_barebones(); 3267761Smsmith 3367761Smsmith for (i = first_vcpu_id; i < first_vcpu_id + num_vcpus; i++) 3467761Smsmith /* This asserts that the vCPU was created. */ 3567761Smsmith __vm_vcpu_add(vm, i); 3667761Smsmith 3767761Smsmith kvm_vm_free(vm); 3867761Smsmith} 39118783Snjl 4077432Smsmithint main(int argc, char *argv[]) 4191123Smsmith{ 4269744Smsmith int kvm_max_vcpu_id = kvm_check_cap(KVM_CAP_MAX_VCPU_ID); 4367761Smsmith int kvm_max_vcpus = kvm_check_cap(KVM_CAP_MAX_VCPUS); 4467761Smsmith /* 4567761Smsmith * Number of file descriptors reqired, KVM_CAP_MAX_VCPUS for vCPU fds + 46120308Snjl * an arbitrary number for everything else. 47118783Snjl */ 48118783Snjl int nr_fds_wanted = kvm_max_vcpus + 100; 49120308Snjl struct rlimit rl; 5067761Smsmith 5167761Smsmith pr_info("KVM_CAP_MAX_VCPU_ID: %d\n", kvm_max_vcpu_id); 52118783Snjl pr_info("KVM_CAP_MAX_VCPUS: %d\n", kvm_max_vcpus); 53118783Snjl 54118783Snjl /* 5567761Smsmith * Check that we're allowed to open nr_fds_wanted file descriptors and 5667761Smsmith * try raising the limits if needed. 57100497Siwasaki */ 58100497Siwasaki TEST_ASSERT(!getrlimit(RLIMIT_NOFILE, &rl), "getrlimit() failed!"); 59118783Snjl 60118783Snjl if (rl.rlim_cur < nr_fds_wanted) { 61120308Snjl rl.rlim_cur = nr_fds_wanted; 62120308Snjl if (rl.rlim_max < nr_fds_wanted) { 6367761Smsmith int old_rlim_max = rl.rlim_max; 6467761Smsmith rl.rlim_max = nr_fds_wanted; 6567761Smsmith 6667761Smsmith int r = setrlimit(RLIMIT_NOFILE, &rl); 6767761Smsmith __TEST_REQUIRE(r >= 0, 6867761Smsmith "RLIMIT_NOFILE hard limit is too low (%d, wanted %d)", 6967761Smsmith old_rlim_max, nr_fds_wanted); 70100497Siwasaki } else { 71118049Stakawata TEST_ASSERT(!setrlimit(RLIMIT_NOFILE, &rl), "setrlimit() failed!"); 72100497Siwasaki } 7367761Smsmith } 7467761Smsmith 7567761Smsmith /* 7667761Smsmith * Upstream KVM prior to 4.8 does not support KVM_CAP_MAX_VCPU_ID. 7767761Smsmith * Userspace is supposed to use KVM_CAP_MAX_VCPUS as the maximum ID 7867761Smsmith * in this case. 7967761Smsmith */ 8067761Smsmith if (!kvm_max_vcpu_id) 8167761Smsmith kvm_max_vcpu_id = kvm_max_vcpus; 8267761Smsmith 8389054Smsmith TEST_ASSERT(kvm_max_vcpu_id >= kvm_max_vcpus, 84118783Snjl "KVM_MAX_VCPU_IDS (%d) must be at least as large as KVM_MAX_VCPUS (%d).", 85118783Snjl kvm_max_vcpu_id, kvm_max_vcpus); 8667761Smsmith 8767761Smsmith test_vcpu_creation(0, kvm_max_vcpus); 8867761Smsmith 8967761Smsmith if (kvm_max_vcpu_id > kvm_max_vcpus) 9067761Smsmith test_vcpu_creation( 91120308Snjl kvm_max_vcpu_id - kvm_max_vcpus, kvm_max_vcpus); 9267761Smsmith 9367761Smsmith return 0; 94120308Snjl} 95120308Snjl