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