1 files changed, 152 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/x86/sev_init2_tests.c b/tools/testing/selftests/kvm/x86/sev_init2_tests.c
new file mode 100644
index 000000000000..3fb967f40c6a
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86/sev_init2_tests.c
@@ -0,0 +1,152 @@
+// 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"
+
+#define SVM_SEV_FEAT_DEBUG_SWAP 32u
+
+/*
+ * Some features may have hidden dependencies, or may only work
+ * for certain VM types.  Err on the side of safety and don't
+ * expect that all supported features can be passed one by one
+ * to KVM_SEV_INIT2.
+ *
+ * (Well, right now there's only one...)
+ */
+#define KNOWN_FEATURES SVM_SEV_FEAT_DEBUG_SWAP
+
+int kvm_fd;
+u64 supported_vmsa_features;
+bool have_sev_es;
+
+static int __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: fw error: %d\n",
+		    cmd_id, cmd.error);
+
+	return ret;
+}
+
+static void test_init2(unsigned long vm_type, struct kvm_sev_init *init)
+{
+	struct kvm_vm *vm;
+	int ret;
+
+	vm = vm_create_barebones_type(vm_type);
+	ret = __sev_ioctl(vm->fd, KVM_SEV_INIT2, init);
+	TEST_ASSERT(ret == 0,
+		    "KVM_SEV_INIT2 return code is %d (expected 0), errno: %d",
+		    ret, errno);
+	kvm_vm_free(vm);
+}
+
+static void test_init2_invalid(unsigned long vm_type, struct kvm_sev_init *init, const char *msg)
+{
+	struct kvm_vm *vm;
+	int ret;
+
+	vm = vm_create_barebones_type(vm_type);
+	ret = __sev_ioctl(vm->fd, KVM_SEV_INIT2, init);
+	TEST_ASSERT(ret == -1 && errno == EINVAL,
+		    "KVM_SEV_INIT2 should fail, %s.",
+		    msg);
+	kvm_vm_free(vm);
+}
+
+void test_vm_types(void)
+{
+	test_init2(KVM_X86_SEV_VM, &(struct kvm_sev_init){});
+
+	/*
+	 * TODO: check that unsupported types cannot be created.  Probably
+	 * a separate selftest.
+	 */
+	if (have_sev_es)
+		test_init2(KVM_X86_SEV_ES_VM, &(struct kvm_sev_init){});
+
+	test_init2_invalid(0, &(struct kvm_sev_init){},
+			   "VM type is KVM_X86_DEFAULT_VM");
+	if (kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SW_PROTECTED_VM))
+		test_init2_invalid(KVM_X86_SW_PROTECTED_VM, &(struct kvm_sev_init){},
+				   "VM type is KVM_X86_SW_PROTECTED_VM");
+}
+
+void test_flags(uint32_t vm_type)
+{
+	int i;
+
+	for (i = 0; i < 32; i++)
+		test_init2_invalid(vm_type,
+			&(struct kvm_sev_init){ .flags = BIT(i) },
+			"invalid flag");
+}
+
+void test_features(uint32_t vm_type, uint64_t supported_features)
+{
+	int i;
+
+	for (i = 0; i < 64; i++) {
+		if (!(supported_features & BIT_ULL(i)))
+			test_init2_invalid(vm_type,
+				&(struct kvm_sev_init){ .vmsa_features = BIT_ULL(i) },
+				"unknown feature");
+		else if (KNOWN_FEATURES & BIT_ULL(i))
+			test_init2(vm_type,
+				&(struct kvm_sev_init){ .vmsa_features = BIT_ULL(i) });
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	int kvm_fd = open_kvm_dev_path_or_exit();
+	bool have_sev;
+
+	TEST_REQUIRE(__kvm_has_device_attr(kvm_fd, KVM_X86_GRP_SEV,
+					   KVM_X86_SEV_VMSA_FEATURES) == 0);
+	kvm_device_attr_get(kvm_fd, KVM_X86_GRP_SEV,
+			    KVM_X86_SEV_VMSA_FEATURES,
+			    &supported_vmsa_features);
+
+	have_sev = kvm_cpu_has(X86_FEATURE_SEV);
+	TEST_ASSERT(have_sev == !!(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SEV_VM)),
+		    "sev: KVM_CAP_VM_TYPES (%x) does not match cpuid (checking %x)",
+		    kvm_check_cap(KVM_CAP_VM_TYPES), 1 << KVM_X86_SEV_VM);
+
+	TEST_REQUIRE(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SEV_VM));
+	have_sev_es = kvm_cpu_has(X86_FEATURE_SEV_ES);
+
+	TEST_ASSERT(have_sev_es == !!(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SEV_ES_VM)),
+		    "sev-es: KVM_CAP_VM_TYPES (%x) does not match cpuid (checking %x)",
+		    kvm_check_cap(KVM_CAP_VM_TYPES), 1 << KVM_X86_SEV_ES_VM);
+
+	test_vm_types();
+
+	test_flags(KVM_X86_SEV_VM);
+	if (have_sev_es)
+		test_flags(KVM_X86_SEV_ES_VM);
+
+	test_features(KVM_X86_SEV_VM, 0);
+	if (have_sev_es)
+		test_features(KVM_X86_SEV_ES_VM, supported_vmsa_features);
+
+	return 0;
+}