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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/tools/testing/selftests/kvm/arm64/vcpu_width_config.c
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// SPDX-License-Identifier: GPL-2.0-only

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/*

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 * vcpu_width_config - Test KVM_ARM_VCPU_INIT() with KVM_ARM_VCPU_EL1_32BIT.

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 *

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 * Copyright (c) 2022 Google LLC.

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 *

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 * This is a test that ensures that non-mixed-width vCPUs (all 64bit vCPUs

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 * or all 32bit vcPUs) can be configured and mixed-width vCPUs cannot be

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 * configured.

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 */

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#include "kvm_util.h"

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#include "processor.h"

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#include "test_util.h"

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/*

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 * Add a vCPU, run KVM_ARM_VCPU_INIT with @init0, and then

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 * add another vCPU, and run KVM_ARM_VCPU_INIT with @init1.

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 */

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static int add_init_2vcpus(struct kvm_vcpu_init *init0,

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			   struct kvm_vcpu_init *init1)

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{

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	struct kvm_vcpu *vcpu0, *vcpu1;

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	struct kvm_vm *vm;

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	int ret;

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	vm = vm_create_barebones();

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	vcpu0 = __vm_vcpu_add(vm, 0);

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	ret = __vcpu_ioctl(vcpu0, KVM_ARM_VCPU_INIT, init0);

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	if (ret)

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		goto free_exit;

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	vcpu1 = __vm_vcpu_add(vm, 1);

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	ret = __vcpu_ioctl(vcpu1, KVM_ARM_VCPU_INIT, init1);

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free_exit:

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	kvm_vm_free(vm);

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	return ret;

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}

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/*

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 * Add two vCPUs, then run KVM_ARM_VCPU_INIT for one vCPU with @init0,

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 * and run KVM_ARM_VCPU_INIT for another vCPU with @init1.

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 */

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static int add_2vcpus_init_2vcpus(struct kvm_vcpu_init *init0,

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				  struct kvm_vcpu_init *init1)

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{

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	struct kvm_vcpu *vcpu0, *vcpu1;

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	struct kvm_vm *vm;

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	int ret;

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	vm = vm_create_barebones();

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	vcpu0 = __vm_vcpu_add(vm, 0);

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	vcpu1 = __vm_vcpu_add(vm, 1);

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	ret = __vcpu_ioctl(vcpu0, KVM_ARM_VCPU_INIT, init0);

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	if (ret)

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		goto free_exit;

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	ret = __vcpu_ioctl(vcpu1, KVM_ARM_VCPU_INIT, init1);

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free_exit:

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	kvm_vm_free(vm);

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	return ret;

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}

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/*

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 * Tests that two 64bit vCPUs can be configured, two 32bit vCPUs can be

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 * configured, and two mixed-width vCPUs cannot be configured.

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 * Each of those three cases, configure vCPUs in two different orders.

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 * The one is running KVM_CREATE_VCPU for 2 vCPUs, and then running

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 * KVM_ARM_VCPU_INIT for them.

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 * The other is running KVM_CREATE_VCPU and KVM_ARM_VCPU_INIT for a vCPU,

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 * and then run those commands for another vCPU.

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 */

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int main(void)

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{

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	struct kvm_vcpu_init init0, init1;

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	struct kvm_vm *vm;

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	int ret;

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	TEST_REQUIRE(kvm_has_cap(KVM_CAP_ARM_EL1_32BIT));

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	/* Get the preferred target type and copy that to init1 for later use */

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	vm = vm_create_barebones();

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	vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init0);

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	kvm_vm_free(vm);

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	init1 = init0;

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	/* Test with 64bit vCPUs */

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	ret = add_init_2vcpus(&init0, &init0);

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	TEST_ASSERT(ret == 0,

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		    "Configuring 64bit EL1 vCPUs failed unexpectedly");

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	ret = add_2vcpus_init_2vcpus(&init0, &init0);

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	TEST_ASSERT(ret == 0,

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		    "Configuring 64bit EL1 vCPUs failed unexpectedly");

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	/* Test with 32bit vCPUs */

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	init0.features[0] = (1 << KVM_ARM_VCPU_EL1_32BIT);

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	ret = add_init_2vcpus(&init0, &init0);

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	TEST_ASSERT(ret == 0,

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		    "Configuring 32bit EL1 vCPUs failed unexpectedly");

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	ret = add_2vcpus_init_2vcpus(&init0, &init0);

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	TEST_ASSERT(ret == 0,

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		    "Configuring 32bit EL1 vCPUs failed unexpectedly");

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	/* Test with mixed-width vCPUs  */

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	init0.features[0] = 0;

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	init1.features[0] = (1 << KVM_ARM_VCPU_EL1_32BIT);

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	ret = add_init_2vcpus(&init0, &init1);

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	TEST_ASSERT(ret != 0,

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		    "Configuring mixed-width vCPUs worked unexpectedly");

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	ret = add_2vcpus_init_2vcpus(&init0, &init1);

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	TEST_ASSERT(ret != 0,

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		    "Configuring mixed-width vCPUs worked unexpectedly");

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	return 0;

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}

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