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Commit 4b350aeb authored by Aaron Lewis's avatar Aaron Lewis Committed by Paolo Bonzini
Browse files

tests: kvm: Add tests for KVM_CAP_MAX_VCPUS and KVM_CAP_MAX_CPU_ID 



Signed-off-by: default avatarAaron Lewis <aaronlewis@google.com>
Reviewed-by: default avatarPeter Shier <pshier@google.com>
Reviewed-by: default avatarMarc Orr <marcorr@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 648a93c8

tools/testing/selftests/kvm/.gitignore

+1 −0
Original line number Diff line number Diff line 
/x86_64/cr4_cpuid_sync_test

/x86_64/evmcs_test

/x86_64/hyperv_cpuid

/x86_64/kvm_create_max_vcpus

/x86_64/platform_info_test

/x86_64/set_sregs_test

/x86_64/smm_test

tools/testing/selftests/kvm/Makefile

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@@ -20,6 +20,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test 
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid

TEST_GEN_PROGS_x86_64 += x86_64/vmx_close_while_nested_test

TEST_GEN_PROGS_x86_64 += x86_64/smm_test

TEST_GEN_PROGS_x86_64 += x86_64/kvm_create_max_vcpus

TEST_GEN_PROGS_x86_64 += dirty_log_test

TEST_GEN_PROGS_x86_64 += clear_dirty_log_test

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

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/*

 * kvm_create_max_vcpus

 *

 * Copyright (C) 2019, Google LLC.

 *

 * This work is licensed under the terms of the GNU GPL, version 2.

 *

 * 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 "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;



	printf("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_P52V48_4K, DEFAULT_GUEST_PHY_PAGES, O_RDWR);



	for (i = 0; i < num_vcpus; i++) {

		int vcpu_id = first_vcpu_id + i;



		/* This asserts that the vCPU was created. */

		vm_vcpu_add(vm, vcpu_id, 0, 0);

	}



	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);



	printf("KVM_CAP_MAX_VCPU_ID: %d\n", kvm_max_vcpu_id);

	printf("KVM_CAP_MAX_VCPUS: %d\n", kvm_max_vcpus);



	/*

	 * 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;

}