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KVM_MAX_VCPU_ID is not specifying the highest allowed vcpu-id, but the number of allowed vcpu-ids. This has already led to confusion, so rename KVM_MAX_VCPU_ID to KVM_MAX_VCPU_IDS to make its semantics more clear Suggested-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20210913135745.13944-3-jgross@suse.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
66 lines
1.6 KiB
C
66 lines
1.6 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 "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(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
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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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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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* 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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