95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* kvm_create_max_vcpus
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*
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* Copyright (C) 2019, Google LLC.
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*
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* Test for KVM_CAP_MAX_VCPUS and KVM_CAP_MAX_VCPU_ID.
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*/
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#define _GNU_SOURCE /* for program_invocation_short_name */
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/resource.h>
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#include "test_util.h"
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#include "kvm_util.h"
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#include "asm/kvm.h"
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#include "linux/kvm.h"
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void test_vcpu_creation(int first_vcpu_id, int num_vcpus)
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{
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struct kvm_vm *vm;
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int i;
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pr_info("Testing creating %d vCPUs, with IDs %d...%d.\n",
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num_vcpus, first_vcpu_id, first_vcpu_id + num_vcpus - 1);
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vm = vm_create_barebones();
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for (i = first_vcpu_id; i < first_vcpu_id + num_vcpus; i++)
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/* This asserts that the vCPU was created. */
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__vm_vcpu_add(vm, i);
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kvm_vm_free(vm);
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}
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int main(int argc, char *argv[])
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{
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int kvm_max_vcpu_id = kvm_check_cap(KVM_CAP_MAX_VCPU_ID);
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int kvm_max_vcpus = kvm_check_cap(KVM_CAP_MAX_VCPUS);
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/*
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* Number of file descriptors reqired, KVM_CAP_MAX_VCPUS for vCPU fds +
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* an arbitrary number for everything else.
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*/
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int nr_fds_wanted = kvm_max_vcpus + 100;
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struct rlimit rl;
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pr_info("KVM_CAP_MAX_VCPU_ID: %d\n", kvm_max_vcpu_id);
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pr_info("KVM_CAP_MAX_VCPUS: %d\n", kvm_max_vcpus);
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/*
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* Check that we're allowed to open nr_fds_wanted file descriptors and
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* try raising the limits if needed.
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*/
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TEST_ASSERT(!getrlimit(RLIMIT_NOFILE, &rl), "getrlimit() failed!");
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if (rl.rlim_cur < nr_fds_wanted) {
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rl.rlim_cur = nr_fds_wanted;
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if (rl.rlim_max < nr_fds_wanted) {
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int old_rlim_max = rl.rlim_max;
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rl.rlim_max = nr_fds_wanted;
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int r = setrlimit(RLIMIT_NOFILE, &rl);
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__TEST_REQUIRE(r >= 0,
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"RLIMIT_NOFILE hard limit is too low (%d, wanted %d)\n",
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old_rlim_max, nr_fds_wanted);
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} else {
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TEST_ASSERT(!setrlimit(RLIMIT_NOFILE, &rl), "setrlimit() failed!");
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}
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}
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/*
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* Upstream KVM prior to 4.8 does not support KVM_CAP_MAX_VCPU_ID.
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* Userspace is supposed to use KVM_CAP_MAX_VCPUS as the maximum ID
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* in this case.
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*/
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if (!kvm_max_vcpu_id)
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kvm_max_vcpu_id = kvm_max_vcpus;
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TEST_ASSERT(kvm_max_vcpu_id >= kvm_max_vcpus,
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"KVM_MAX_VCPU_IDS (%d) must be at least as large as KVM_MAX_VCPUS (%d).",
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kvm_max_vcpu_id, kvm_max_vcpus);
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test_vcpu_creation(0, kvm_max_vcpus);
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if (kvm_max_vcpu_id > kvm_max_vcpus)
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test_vcpu_creation(
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kvm_max_vcpu_id - kvm_max_vcpus, kvm_max_vcpus);
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return 0;
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}
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