Commit 753dcf7a authored by Zeng Guang's avatar Zeng Guang Committed by Paolo Bonzini
Browse files

kvm: selftests: Add KVM_CAP_MAX_VCPU_ID cap test 



Basic test coverage of KVM_CAP_MAX_VCPU_ID cap.

This capability can be enabled before vCPU creation and only allowed
to set once. if assigned vcpu id is beyond KVM_CAP_MAX_VCPU_ID
capability, vCPU creation will fail.

Signed-off-by: default avatarZeng Guang <guang.zeng@intel.com>
Message-Id: <20220422134456.26655-1-guang.zeng@intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 35875316

tools/testing/selftests/kvm/.gitignore

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@@ -25,6 +25,7 @@ 
/x86_64/hyperv_cpuid

/x86_64/hyperv_features

/x86_64/hyperv_svm_test

/x86_64/max_vcpuid_cap_test

/x86_64/mmio_warning_test

/x86_64/mmu_role_test

/x86_64/platform_info_test

tools/testing/selftests/kvm/Makefile

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@@ -89,6 +89,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/xen_shinfo_test 
TEST_GEN_PROGS_x86_64 += x86_64/xen_vmcall_test

TEST_GEN_PROGS_x86_64 += x86_64/sev_migrate_tests

TEST_GEN_PROGS_x86_64 += x86_64/amx_test

TEST_GEN_PROGS_x86_64 += x86_64/max_vcpuid_cap_test

TEST_GEN_PROGS_x86_64 += access_tracking_perf_test

TEST_GEN_PROGS_x86_64 += demand_paging_test

TEST_GEN_PROGS_x86_64 += dirty_log_test

tools/testing/selftests/kvm/x86_64/max_vcpuid_cap_test.c

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// SPDX-License-Identifier: GPL-2.0-only

/*

 * maximum APIC ID capability tests

 *

 * Copyright (C) 2022, Intel, Inc.

 *

 * Tests for getting/setting maximum APIC ID capability

 */



#include "kvm_util.h"

#include "../lib/kvm_util_internal.h"



#define MAX_VCPU_ID	2



int main(int argc, char *argv[])

{

	struct kvm_vm *vm;

	struct kvm_enable_cap cap = { 0 };

	int ret;



	vm = vm_create(VM_MODE_DEFAULT, 0, O_RDWR);



	/* Get KVM_CAP_MAX_VCPU_ID cap supported in KVM */

	ret = vm_check_cap(vm, KVM_CAP_MAX_VCPU_ID);



	/* Try to set KVM_CAP_MAX_VCPU_ID beyond KVM cap */

	cap.cap = KVM_CAP_MAX_VCPU_ID;

	cap.args[0] = ret + 1;

	ret = ioctl(vm->fd, KVM_ENABLE_CAP, &cap);

	TEST_ASSERT(ret < 0,

		    "Unexpected success to enable KVM_CAP_MAX_VCPU_ID"

		    "beyond KVM cap!\n");



	/* Set KVM_CAP_MAX_VCPU_ID */

	cap.cap = KVM_CAP_MAX_VCPU_ID;

	cap.args[0] = MAX_VCPU_ID;

	ret = ioctl(vm->fd, KVM_ENABLE_CAP, &cap);

	TEST_ASSERT(ret == 0,

		    "Unexpected failure to enable KVM_CAP_MAX_VCPU_ID!\n");



	/* Try to set KVM_CAP_MAX_VCPU_ID again */

	cap.args[0] = MAX_VCPU_ID + 1;

	ret = ioctl(vm->fd, KVM_ENABLE_CAP, &cap);

	TEST_ASSERT(ret < 0,

		    "Unexpected success to enable KVM_CAP_MAX_VCPU_ID again\n");



	/* Create vCPU with id beyond KVM_CAP_MAX_VCPU_ID cap*/

	ret = ioctl(vm->fd, KVM_CREATE_VCPU, MAX_VCPU_ID);

	TEST_ASSERT(ret < 0,

		    "Unexpected success in creating a vCPU with VCPU ID out of range\n");



	kvm_vm_free(vm);

	return 0;

}