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@xxxxxxxxxx>
Signed-off-by: Reiji Watanabe <reijiw@xxxxxxxxxx>
---
tools/testing/selftests/kvm/.gitignore | 1 +
tools/testing/selftests/kvm/Makefile | 1 +
.../selftests/kvm/aarch64/vcpu_width_config.c | 125 ++++++++++++++++++
3 files changed, 127 insertions(+)
create mode 100644 tools/testing/selftests/kvm/aarch64/vcpu_width_config.c
diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index dce7de7755e6..4e884e29b2a8 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -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
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 0e4926bc9a58..06a5a982123e 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -104,6 +104,7 @@ 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
diff --git a/tools/testing/selftests/kvm/aarch64/vcpu_width_config.c b/tools/testing/selftests/kvm/aarch64/vcpu_width_config.c
new file mode 100644
index 000000000000..6e6e6a9f69e3
--- /dev/null
+++ b/tools/testing/selftests/kvm/aarch64/vcpu_width_config.c
@@ -0,0 +1,125 @@
+// 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.
+ */
+
+#define _GNU_SOURCE
+
+#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-witgh 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) <= 0) {
+ print_skip("KVM_CAP_ARM_EL1_32BIT is not supported");
+ exit(KSFT_SKIP);
+ }
+
+ /* Get the preferred target type and copy that to init2 */
+ vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
+ vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init1);
+ kvm_vm_free(vm);
+ memcpy(&init2, &init1, sizeof(init2));
+
+ /* Test with 64bit vCPUs */
+ ret = add_init_2vcpus(&init1, &init2);
+ TEST_ASSERT(ret == 0,
+ "Configuring 64bit EL1 vCPUs failed unexpectedly");
+ ret = add_2vcpus_init_2vcpus(&init1, &init2);
+ TEST_ASSERT(ret == 0,
+ "Configuring 64bit EL1 vCPUs failed unexpectedly");
+
+ /* Test with 32bit vCPUs */
+ init1.features[0] = (1 << KVM_ARM_VCPU_EL1_32BIT);
+ init2.features[0] = (1 << KVM_ARM_VCPU_EL1_32BIT);
+ ret = add_init_2vcpus(&init1, &init2);
+ TEST_ASSERT(ret == 0,
+ "Configuring 32bit EL1 vCPUs failed unexpectedly");
+ ret = add_2vcpus_init_2vcpus(&init1, &init2);
+ 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;
+}
--
2.35.1.894.gb6a874cedc-goog
