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KVM: arm64: selftests: Introduce vcpu_width_config

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Introduce a test for aarch64 that ensures non-mixed-width vCPUs
(all 64bit vCPUs or all 32bit vcPUs) can be configured, and
mixed-width vCPUs cannot be configured.

Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Reiji Watanabe <reijiw@google.com>
Reviewed-by: Oliver Upton <oupton@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220329031924.619453-3-reijiw@google.com
This commit is contained in:
Reiji Watanabe 2022-03-28 20:19:24 -07:00 committed by Marc Zyngier
parent 26bf74bd9f
commit 2f5d27e6cf
3 changed files with 124 additions and 0 deletions
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1
tools/testing/selftests/kvm/.gitignore vendored
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@ -3,6 +3,7 @@
/aarch64/debug-exceptions
/aarch64/get-reg-list
/aarch64/psci_cpu_on_test
/aarch64/vcpu_width_config
/aarch64/vgic_init
/aarch64/vgic_irq
/s390x/memop

1
tools/testing/selftests/kvm/Makefile
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@ -106,6 +106,7 @@ TEST_GEN_PROGS_aarch64 += aarch64/arch_timer
TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions
TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
TEST_GEN_PROGS_aarch64 += aarch64/psci_cpu_on_test
TEST_GEN_PROGS_aarch64 += aarch64/vcpu_width_config
TEST_GEN_PROGS_aarch64 += aarch64/vgic_init
TEST_GEN_PROGS_aarch64 += aarch64/vgic_irq
TEST_GEN_PROGS_aarch64 += demand_paging_test

122
tools/testing/selftests/kvm/aarch64/vcpu_width_config.c Normal file
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@ -0,0 +1,122 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* vcpu_width_config - Test KVM_ARM_VCPU_INIT() with KVM_ARM_VCPU_EL1_32BIT.
*
* Copyright (c) 2022 Google LLC.
*
* This is a test that ensures that non-mixed-width vCPUs (all 64bit vCPUs
* or all 32bit vcPUs) can be configured and mixed-width vCPUs cannot be
* configured.
*/
#include "kvm_util.h"
#include "processor.h"
#include "test_util.h"
/*
* Add a vCPU, run KVM_ARM_VCPU_INIT with @init1, and then
* add another vCPU, and run KVM_ARM_VCPU_INIT with @init2.
*/
static int add_init_2vcpus(struct kvm_vcpu_init *init1,
struct kvm_vcpu_init *init2)
{
struct kvm_vm *vm;
int ret;
vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
vm_vcpu_add(vm, 0);
ret = _vcpu_ioctl(vm, 0, KVM_ARM_VCPU_INIT, init1);
if (ret)
goto free_exit;
vm_vcpu_add(vm, 1);
ret = _vcpu_ioctl(vm, 1, KVM_ARM_VCPU_INIT, init2);
free_exit:
kvm_vm_free(vm);
return ret;
}
/*
* Add two vCPUs, then run KVM_ARM_VCPU_INIT for one vCPU with @init1,
* and run KVM_ARM_VCPU_INIT for another vCPU with @init2.
*/
static int add_2vcpus_init_2vcpus(struct kvm_vcpu_init *init1,
struct kvm_vcpu_init *init2)
{
struct kvm_vm *vm;
int ret;
vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
vm_vcpu_add(vm, 0);
vm_vcpu_add(vm, 1);
ret = _vcpu_ioctl(vm, 0, KVM_ARM_VCPU_INIT, init1);
if (ret)
goto free_exit;
ret = _vcpu_ioctl(vm, 1, KVM_ARM_VCPU_INIT, init2);
free_exit:
kvm_vm_free(vm);
return ret;
}
/*
* Tests that two 64bit vCPUs can be configured, two 32bit vCPUs can be
* configured, and two mixed-width vCPUs cannot be configured.
* Each of those three cases, configure vCPUs in two different orders.
* The one is running KVM_CREATE_VCPU for 2 vCPUs, and then running
* KVM_ARM_VCPU_INIT for them.
* The other is running KVM_CREATE_VCPU and KVM_ARM_VCPU_INIT for a vCPU,
* and then run those commands for another vCPU.
*/
int main(void)
{
struct kvm_vcpu_init init1, init2;
struct kvm_vm *vm;
int ret;
if (!kvm_check_cap(KVM_CAP_ARM_EL1_32BIT)) {
print_skip("KVM_CAP_ARM_EL1_32BIT is not supported");
exit(KSFT_SKIP);
}
/* Get the preferred target type and copy that to init2 for later use */
vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init1);
kvm_vm_free(vm);
init2 = init1;
/* Test with 64bit vCPUs */
ret = add_init_2vcpus(&init1, &init1);
TEST_ASSERT(ret == 0,
"Configuring 64bit EL1 vCPUs failed unexpectedly");
ret = add_2vcpus_init_2vcpus(&init1, &init1);
TEST_ASSERT(ret == 0,
"Configuring 64bit EL1 vCPUs failed unexpectedly");
/* Test with 32bit vCPUs */
init1.features[0] = (1 << KVM_ARM_VCPU_EL1_32BIT);
ret = add_init_2vcpus(&init1, &init1);
TEST_ASSERT(ret == 0,
"Configuring 32bit EL1 vCPUs failed unexpectedly");
ret = add_2vcpus_init_2vcpus(&init1, &init1);
TEST_ASSERT(ret == 0,
"Configuring 32bit EL1 vCPUs failed unexpectedly");
/* Test with mixed-width vCPUs */
init1.features[0] = 0;
init2.features[0] = (1 << KVM_ARM_VCPU_EL1_32BIT);
ret = add_init_2vcpus(&init1, &init2);
TEST_ASSERT(ret != 0,
"Configuring mixed-width vCPUs worked unexpectedly");
ret = add_2vcpus_init_2vcpus(&init1, &init2);
TEST_ASSERT(ret != 0,
"Configuring mixed-width vCPUs worked unexpectedly");
return 0;
}