Add tests to confirm mirror vms can only run correct subset of commands.
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
Cc: Marc Orr <marcorr@xxxxxxxxxx>
Signed-off-by: Peter Gonda <pgonda@xxxxxxxxxx>
---
.../selftests/kvm/x86_64/sev_migrate_tests.c | 55 +++++++++++++++++--
1 file changed, 51 insertions(+), 4 deletions(-)
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 4bb960ca6486..80056bbbb003 100644
--- a/tools/testing/selftests/kvm/x86_64/sev_migrate_tests.c
+++ b/tools/testing/selftests/kvm/x86_64/sev_migrate_tests.c
@@ -21,7 +21,7 @@
#define NR_LOCK_TESTING_THREADS 3
#define NR_LOCK_TESTING_ITERATIONS 10000
-static void sev_ioctl(int vm_fd, int cmd_id, void *data)
+static int __sev_ioctl(int vm_fd, int cmd_id, void *data, __u32 *fw_error)
{
struct kvm_sev_cmd cmd = {
.id = cmd_id,
@@ -30,11 +30,20 @@ static void sev_ioctl(int vm_fd, int cmd_id, void *data)
};
int ret;
-
ret = ioctl(vm_fd, KVM_MEMORY_ENCRYPT_OP, &cmd);
- TEST_ASSERT(ret == 0 && cmd.error == SEV_RET_SUCCESS,
+ *fw_error = cmd.error;
+ return ret;
+}
+
+static void sev_ioctl(int vm_fd, int cmd_id, void *data)
+{
+ int ret;
+ __u32 fw_error;
+
+ ret = __sev_ioctl(vm_fd, cmd_id, data, &fw_error);
+ TEST_ASSERT(ret == 0 && fw_error == SEV_RET_SUCCESS,
"%d failed: return code: %d, errno: %d, fw error: %d",
- cmd_id, ret, errno, cmd.error);
+ cmd_id, ret, errno, fw_error);
}
static struct kvm_vm *sev_vm_create(bool es)
@@ -226,6 +235,42 @@ static void sev_mirror_create(int dst_fd, int src_fd)
TEST_ASSERT(!ret, "Copying context failed, ret: %d, errno: %d\n", ret, errno);
}
+static void verify_mirror_allowed_cmds(int vm_fd)
+{
+ struct kvm_sev_guest_status status;
+
+ for (int cmd_id = KVM_SEV_INIT; cmd_id < KVM_SEV_NR_MAX; ++cmd_id) {
+ int ret;
+ __u32 fw_error;
+
+ /*
+ * These commands are allowed for mirror VMs, all others are
+ * not.
+ */
+ switch (cmd_id) {
+ case KVM_SEV_LAUNCH_UPDATE_VMSA:
+ case KVM_SEV_GUEST_STATUS:
+ case KVM_SEV_DBG_DECRYPT:
+ case KVM_SEV_DBG_ENCRYPT:
+ continue;
+ default:
+ break;
+ }
+
+ /*
+ * These commands should be disallowed before the data
+ * parameter is examined so NULL is OK here.
+ */
+ ret = __sev_ioctl(vm_fd, cmd_id, NULL, &fw_error);
+ TEST_ASSERT(
+ ret == -1 && errno == EINVAL,
+ "Should not be able call command: %d. ret: %d, errno: %d\n",
+ cmd_id, ret, errno);
+ }
+
+ sev_ioctl(vm_fd, KVM_SEV_GUEST_STATUS, &status);
+}
+
static void test_sev_mirror(bool es)
{
struct kvm_vm *src_vm, *dst_vm;
@@ -243,6 +288,8 @@ static void test_sev_mirror(bool es)
if (es)
sev_ioctl(dst_vm->fd, KVM_SEV_LAUNCH_UPDATE_VMSA, NULL);
+ verify_mirror_allowed_cmds(dst_vm->fd);
+
kvm_vm_free(src_vm);
kvm_vm_free(dst_vm);
}
