// 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(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
|
|
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);
|
if (r < 0) {
|
printf("RLIMIT_NOFILE hard limit is too low (%d, wanted %d)\n",
|
old_rlim_max, nr_fds_wanted);
|
exit(KSFT_SKIP);
|
}
|
} 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_ID (%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;
|
}
|
