selftests: sev_migrate_tests: add tests for KVM_CAP_VM_COPY_ENC_CONTEXT_FROM

I am putting the tests in sev_migrate_tests because the failure conditions are
very similar and some of the setup code can be reused, too.

The tests cover both successful creation of a mirror VM, and error
conditions.

Cc: Peter Gonda <pgonda@google.com>
Cc: Sean Christopherson <seanjc@google.com>
Message-Id: <20211123005036.2954379-9-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/tools/testing/selftests/kvm/x86_64/sev_migrate_tests.c b/tools/testing/selftests/kvm/x86_64/sev_migrate_tests.c
index 0cd7e2e..d265cea 100644 (file)
--- a/tools/testing/selftests/kvm/x86_64/sev_migrate_tests.c
+++ b/tools/testing/selftests/kvm/x86_64/sev_migrate_tests.c
@@ -54,12 +54,15 @@ static struct kvm_vm *sev_vm_create(bool es)
        return vm;
 }
 
-static struct kvm_vm *__vm_create(void)
+static struct kvm_vm *aux_vm_create(bool with_vcpus)
 {
        struct kvm_vm *vm;
        int i;
 
        vm = vm_create(VM_MODE_DEFAULT, 0, O_RDWR);
+       if (!with_vcpus)
+               return vm;
+
        for (i = 0; i < NR_MIGRATE_TEST_VCPUS; ++i)
                vm_vcpu_add(vm, i);
 
@@ -93,7 +96,7 @@ static void test_sev_migrate_from(bool es)
 
        src_vm = sev_vm_create(es);
        for (i = 0; i < NR_MIGRATE_TEST_VMS; ++i)
-               dst_vms[i] = __vm_create();
+               dst_vms[i] = aux_vm_create(true);
 
        /* Initial migration from the src to the first dst. */
        sev_migrate_from(dst_vms[0]->fd, src_vm->fd);
@@ -162,7 +165,7 @@ static void test_sev_migrate_parameters(void)
        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();
+       vm_no_sev = aux_vm_create(true);
        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);
@@ -203,11 +206,106 @@ static void test_sev_migrate_parameters(void)
        kvm_vm_free(vm_no_sev);
 }
 
+static int __sev_mirror_create(int dst_fd, int src_fd)
+{
+       struct kvm_enable_cap cap = {
+               .cap = KVM_CAP_VM_COPY_ENC_CONTEXT_FROM,
+               .args = { src_fd }
+       };
+
+       return ioctl(dst_fd, KVM_ENABLE_CAP, &cap);
+}
+
+
+static void sev_mirror_create(int dst_fd, int src_fd)
+{
+       int ret;
+
+       ret = __sev_mirror_create(dst_fd, src_fd);
+       TEST_ASSERT(!ret, "Copying context failed, ret: %d, errno: %d\n", ret, errno);
+}
+
+static void test_sev_mirror(bool es)
+{
+       struct kvm_vm *src_vm, *dst_vm;
+       struct kvm_sev_launch_start start = {
+               .policy = es ? SEV_POLICY_ES : 0
+       };
+       int i;
+
+       src_vm = sev_vm_create(es);
+       dst_vm = aux_vm_create(false);
+
+       sev_mirror_create(dst_vm->fd, src_vm->fd);
+
+       /* Check that we can complete creation of the mirror VM.  */
+       for (i = 0; i < NR_MIGRATE_TEST_VCPUS; ++i)
+               vm_vcpu_add(dst_vm, i);
+       sev_ioctl(dst_vm->fd, KVM_SEV_LAUNCH_START, &start);
+       if (es)
+               sev_ioctl(dst_vm->fd, KVM_SEV_LAUNCH_UPDATE_VMSA, NULL);
+
+       kvm_vm_free(src_vm);
+       kvm_vm_free(dst_vm);
+}
+
+static void test_sev_mirror_parameters(void)
+{
+       struct kvm_vm *sev_vm, *sev_es_vm, *vm_no_vcpu, *vm_with_vcpu;
+       int ret;
+
+       sev_vm = sev_vm_create(/* es= */ false);
+       sev_es_vm = sev_vm_create(/* es= */ true);
+       vm_with_vcpu = aux_vm_create(true);
+       vm_no_vcpu = aux_vm_create(false);
+
+       ret = __sev_mirror_create(sev_vm->fd, sev_vm->fd);
+       TEST_ASSERT(
+               ret == -1 && errno == EINVAL,
+               "Should not be able copy context to self. ret: %d, errno: %d\n",
+               ret, errno);
+
+       ret = __sev_mirror_create(sev_vm->fd, sev_es_vm->fd);
+       TEST_ASSERT(
+               ret == -1 && errno == EINVAL,
+               "Should not be able copy context to SEV enabled VM. ret: %d, errno: %d\n",
+               ret, errno);
+
+       ret = __sev_mirror_create(sev_es_vm->fd, sev_vm->fd);
+       TEST_ASSERT(
+               ret == -1 && errno == EINVAL,
+               "Should not be able copy context to SEV-ES enabled VM. ret: %d, errno: %d\n",
+               ret, errno);
+
+       ret = __sev_mirror_create(vm_no_vcpu->fd, vm_with_vcpu->fd);
+       TEST_ASSERT(ret == -1 && errno == EINVAL,
+                   "Copy context requires SEV enabled. ret %d, errno: %d\n", ret,
+                   errno);
+
+       ret = __sev_mirror_create(vm_with_vcpu->fd, sev_vm->fd);
+       TEST_ASSERT(
+               ret == -1 && errno == EINVAL,
+               "SEV copy context requires no vCPUS on the destination. ret: %d, errno: %d\n",
+               ret, errno);
+
+       kvm_vm_free(sev_vm);
+       kvm_vm_free(sev_es_vm);
+       kvm_vm_free(vm_with_vcpu);
+       kvm_vm_free(vm_no_vcpu);
+}
+
 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();
+       if (kvm_check_cap(KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM)) {
+               test_sev_migrate_from(/* es= */ false);
+               test_sev_migrate_from(/* es= */ true);
+               test_sev_migrate_locking();
+               test_sev_migrate_parameters();
+       }
+       if (kvm_check_cap(KVM_CAP_VM_COPY_ENC_CONTEXT_FROM)) {
+               test_sev_mirror(/* es= */ false);
+               test_sev_mirror(/* es= */ true);
+               test_sev_mirror_parameters();
+       }
        return 0;
 }