[PATCH V11 5/5] selftest: KVM: Add intra host migration tests

Peter Gonda
2021-10-21T17:47:00Z

Adds testcases for intra host migration for SEV and SEV-ES. Also adds
locking test to confirm no deadlock exists.

Signed-off-by: Peter Gonda <pgonda@google.com>
Suggested-by: Sean Christopherson <seanjc@google.com>
Cc: Marc Orr <marcorr@google.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
tools/testing/selftests/kvm/Makefile | 3 +-
.../selftests/kvm/x86_64/sev_vm_tests.c | 203 ++++++++++++++++++
2 files changed, 205 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/kvm/x86_64/sev_vm_tests.c

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index d1774f461393..c6b37d2045d9 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -72,7 +72,8 @@ TEST_GEN_PROGS_x86_64 += x86_64/tsc_msrs_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_pmu_msrs_test
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 += access_tracking_perf_test
+TEST_GEN_PROGS_x86_64 += x86_64/vmx_pi_mmio_test
+TEST_GEN_PROGS_x86_64 += x86_64/sev_vm_tests
TEST_GEN_PROGS_x86_64 += demand_paging_test
TEST_GEN_PROGS_x86_64 += dirty_log_test
TEST_GEN_PROGS_x86_64 += dirty_log_perf_test
diff --git a/tools/testing/selftests/kvm/x86_64/sev_vm_tests.c b/tools/testing/selftests/kvm/x86_64/sev_vm_tests.c
new file mode 100644
index 000000000000..ec3bbc96e73a
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/sev_vm_tests.c
@@ -0,0 +1,203 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/kvm.h>
+#include <linux/psp-sev.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <pthread.h>
+
+#include "test_util.h"
+#include "kvm_util.h"
+#include "processor.h"
+#include "svm_util.h"
+#include "kselftest.h"
+#include "../lib/kvm_util_internal.h"
+
+#define SEV_POLICY_ES 0b100
+
+#define NR_MIGRATE_TEST_VCPUS 4
+#define NR_MIGRATE_TEST_VMS 3
+#define NR_LOCK_TESTING_THREADS 3
+#define NR_LOCK_TESTING_ITERATIONS 10000
+
+static void sev_ioctl(int vm_fd, int cmd_id, void *data)
+{
+ struct kvm_sev_cmd cmd = {
+ .id = cmd_id,
+ .data = (uint64_t)data,
+ .sev_fd = open_sev_dev_path_or_exit(),
+ };
+ int ret;
+
+ ret = ioctl(vm_fd, KVM_MEMORY_ENCRYPT_OP, &cmd);
+ TEST_ASSERT((ret == 0 || cmd.error == SEV_RET_SUCCESS),
+ "%d failed: return code: %d, errno: %d, fw error: %d",
+ cmd_id, ret, errno, cmd.error);
+}
+
+static struct kvm_vm *sev_vm_create(bool es)
+{
+ struct kvm_vm *vm;
+ struct kvm_sev_launch_start start = { 0 };
+ int i;
+
+ vm = vm_create(VM_MODE_DEFAULT, 0, O_RDWR);
+ sev_ioctl(vm->fd, es ? KVM_SEV_ES_INIT : KVM_SEV_INIT, NULL);
+ for (i = 0; i < NR_MIGRATE_TEST_VCPUS; ++i)
+ vm_vcpu_add(vm, i);
+ if (es)
+ start.policy |= SEV_POLICY_ES;
+ sev_ioctl(vm->fd, KVM_SEV_LAUNCH_START, &start);
+ if (es)
+ sev_ioctl(vm->fd, KVM_SEV_LAUNCH_UPDATE_VMSA, NULL);
+ return vm;
+}
+
+static struct kvm_vm *__vm_create(void)
+{
+ struct kvm_vm *vm;
+ int i;
+
+ vm = vm_create(VM_MODE_DEFAULT, 0, O_RDWR);
+ for (i = 0; i < NR_MIGRATE_TEST_VCPUS; ++i)
+ vm_vcpu_add(vm, i);
+
+ return vm;
+}
+
+static int __sev_migrate_from(int dst_fd, int src_fd)
+{
+ struct kvm_enable_cap cap = {
+ .cap = KVM_CAP_VM_MIGRATE_PROTECTED_VM_FROM,
+ .args = { src_fd }
+ };
+
+ return ioctl(dst_fd, KVM_ENABLE_CAP, &cap);
+}
+
+
+static void sev_migrate_from(int dst_fd, int src_fd)
+{
+ int ret;
+
+ ret = __sev_migrate_from(dst_fd, src_fd);
+ TEST_ASSERT(!ret, "Migration failed, ret: %d, errno: %d\n", ret, errno);
+}
+
+static void test_sev_migrate_from(bool es)
+{
+ struct kvm_vm *src_vm;
+ struct kvm_vm *dst_vms[NR_MIGRATE_TEST_VMS];
+ int i;
+
+ src_vm = sev_vm_create(es);
+ for (i = 0; i < NR_MIGRATE_TEST_VMS; ++i)
+ dst_vms[i] = __vm_create();
+
+ /* Initial migration from the src to the first dst. */
+ sev_migrate_from(dst_vms[0]->fd, src_vm->fd);
+
+ for (i = 1; i < NR_MIGRATE_TEST_VMS; i++)
+ sev_migrate_from(dst_vms[i]->fd, dst_vms[i - 1]->fd);
+
+ /* Migrate the guest back to the original VM. */
+ sev_migrate_from(src_vm->fd, dst_vms[NR_MIGRATE_TEST_VMS - 1]->fd);
+
+ kvm_vm_free(src_vm);
+ for (i = 0; i < NR_MIGRATE_TEST_VMS; ++i)
+ kvm_vm_free(dst_vms[i]);
+}
+
+struct locking_thread_input {
+ struct kvm_vm *vm;
+ int source_fds[NR_LOCK_TESTING_THREADS];
+};
+
+static void *locking_test_thread(void *arg)
+{
+ int i, j;
+ struct locking_thread_input *input = (struct locking_test_thread *)arg;
+
+ for (i = 0; i < NR_LOCK_TESTING_ITERATIONS; ++i) {
+ j = i % NR_LOCK_TESTING_THREADS;
+ __sev_migrate_from(input->vm->fd, input->source_fds[j]);
+ }
+
+ return NULL;
+}
+
+static void test_sev_migrate_locking(void)
+{
+ struct locking_thread_input input[NR_LOCK_TESTING_THREADS];
+ pthread_t pt[NR_LOCK_TESTING_THREADS];
+ int i;
+
+ for (i = 0; i < NR_LOCK_TESTING_THREADS; ++i) {
+ input[i].vm = sev_vm_create(/* es= */ false);
+ input[0].source_fds[i] = input[i].vm->fd;
+ }
+ for (i = 1; i < NR_LOCK_TESTING_THREADS; ++i)
+ memcpy(input[i].source_fds, input[0].source_fds,
+ sizeof(input[i].source_fds));
+
+ for (i = 0; i < NR_LOCK_TESTING_THREADS; ++i)
+ pthread_create(&pt[i], NULL, locking_test_thread, &input[i]);
+
+ for (i = 0; i < NR_LOCK_TESTING_THREADS; ++i)
+ pthread_join(pt[i], NULL);
+}
+
+static void test_sev_migrate_parameters(void)
+{
+ struct kvm_vm *sev_vm, *sev_es_vm, *vm_no_vcpu, *vm_no_sev,
+ *sev_es_vm_no_vmsa;
+ int ret;
+
+ sev_vm = sev_vm_create(/* es= */ false);
+ sev_es_vm = sev_vm_create(/* es= */ true);
+ vm_no_vcpu = vm_create(VM_MODE_DEFAULT, 0, O_RDWR);
+ vm_no_sev = __vm_create();
+ sev_es_vm_no_vmsa = vm_create(VM_MODE_DEFAULT, 0, O_RDWR);
+ sev_ioctl(sev_es_vm_no_vmsa->fd, KVM_SEV_ES_INIT, NULL);
+ vm_vcpu_add(sev_es_vm_no_vmsa, 1);
+
+
+ ret = __sev_migrate_from(sev_vm->fd, sev_es_vm->fd);
+ TEST_ASSERT(
+ ret == -1 && errno == EINVAL,
+ "Should not be able migrate to SEV enabled VM. ret: %d, errno: %d\n",
+ ret, errno);
+
+ ret = __sev_migrate_from(sev_es_vm->fd, sev_vm->fd);
+ TEST_ASSERT(
+ ret == -1 && errno == EINVAL,
+ "Should not be able migrate to SEV-ES enabled VM. ret: %d, errno: %d\n",
+ ret, errno);
+
+ ret = __sev_migrate_from(vm_no_vcpu->fd, sev_es_vm->fd);
+ TEST_ASSERT(
+ ret == -1 && errno == EINVAL,
+ "SEV-ES migrations require same number of vCPUS. ret: %d, errno: %d\n",
+ ret, errno);
+
+ ret = __sev_migrate_from(vm_no_vcpu->fd, sev_es_vm_no_vmsa->fd);
+ TEST_ASSERT(
+ ret == -1 && errno == EINVAL,
+ "SEV-ES migrations require UPDATE_VMSA. ret %d, errno: %d\n",
+ ret, errno);
+
+ ret = __sev_migrate_from(vm_no_vcpu->fd, vm_no_sev->fd);
+ TEST_ASSERT(ret == -1 && errno == EINVAL,
+ "Migrations require SEV enabled. ret %d, errno: %d\n", ret,
+ errno);
+}
+
+int main(int argc, char *argv[])
+{
+ test_sev_migrate_from(/* es= */ false);
+ test_sev_migrate_from(/* es= */ true);
+ test_sev_migrate_locking();
+ test_sev_migrate_parameters();
+ return 0;
+}
--
2.33.0.1079.g6e70778dc9-goog