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From:   Eric Auger <eric.auger@redhat.com>
To:     eric.auger.pro@gmail.com, eric.auger@redhat.com,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        pbonzini@redhat.com, vkuznets@redhat.com
Cc:     thuth@redhat.com, drjones@redhat.com, wei.huang2@amd.com
Subject: [PATCH v3 3/3] selftests: KVM: SVM: Add vmcall test
Date:   Tue,  4 Feb 2020 16:00:40 +0100
Message-Id: <20200204150040.2465-4-eric.auger@redhat.com>
In-Reply-To: <20200204150040.2465-1-eric.auger@redhat.com>
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L2 guest calls vmcall and L1 checks the exit status does
correspond.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>

---

v2 -> v3:
- remove useless comment and add Vitaly's R-b
---
 tools/testing/selftests/kvm/Makefile          |  1 +
 .../selftests/kvm/x86_64/svm_vmcall_test.c    | 85 +++++++++++++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/x86_64/svm_vmcall_test.c

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftes=
ts/kvm/Makefile
index 2e770f554cae..b529d3b42c02 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -26,6 +26,7 @@ TEST_GEN_PROGS_x86_64 +=3D x86_64/vmx_dirty_log_test
 TEST_GEN_PROGS_x86_64 +=3D x86_64/vmx_set_nested_state_test
 TEST_GEN_PROGS_x86_64 +=3D x86_64/vmx_tsc_adjust_test
 TEST_GEN_PROGS_x86_64 +=3D x86_64/xss_msr_test
+TEST_GEN_PROGS_x86_64 +=3D x86_64/svm_vmcall_test
 TEST_GEN_PROGS_x86_64 +=3D clear_dirty_log_test
 TEST_GEN_PROGS_x86_64 +=3D dirty_log_test
 TEST_GEN_PROGS_x86_64 +=3D kvm_create_max_vcpus
diff --git a/tools/testing/selftests/kvm/x86_64/svm_vmcall_test.c b/tools=
/testing/selftests/kvm/x86_64/svm_vmcall_test.c
new file mode 100644
index 000000000000..33cc26b57a73
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/svm_vmcall_test.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * svm_vmcall_test
+ *
+ * Copyright (C) 2020, Red Hat, Inc.
+ *
+ * Nested SVM testing: VMCALL
+ */
+
+#include "test_util.h"
+#include "kvm_util.h"
+#include "processor.h"
+#include "svm_util.h"
+
+#include <string.h>
+#include <sys/ioctl.h>
+
+#include "kselftest.h"
+#include <linux/kernel.h>
+
+#define VCPU_ID		5
+
+static struct kvm_vm *vm;
+
+static inline void l2_vmcall(struct svm_test_data *svm)
+{
+	__asm__ __volatile__("vmcall");
+}
+
+static void l1_guest_code(struct svm_test_data *svm)
+{
+	#define L2_GUEST_STACK_SIZE 64
+	unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
+	struct vmcb *vmcb =3D svm->vmcb;
+
+	/* Prepare for L2 execution. */
+	generic_svm_setup(svm, l2_vmcall,
+			  &l2_guest_stack[L2_GUEST_STACK_SIZE]);
+
+	run_guest(vmcb, svm->vmcb_gpa);
+
+	GUEST_ASSERT(vmcb->control.exit_code =3D=3D SVM_EXIT_VMMCALL);
+	GUEST_DONE();
+}
+
+int main(int argc, char *argv[])
+{
+	vm_vaddr_t svm_gva;
+
+	nested_svm_check_supported();
+
+	vm =3D vm_create_default(VCPU_ID, 0, (void *) l1_guest_code);
+	vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
+
+	vcpu_alloc_svm(vm, &svm_gva);
+	vcpu_args_set(vm, VCPU_ID, 1, svm_gva);
+
+	for (;;) {
+		volatile struct kvm_run *run =3D vcpu_state(vm, VCPU_ID);
+		struct ucall uc;
+
+		vcpu_run(vm, VCPU_ID);
+		TEST_ASSERT(run->exit_reason =3D=3D KVM_EXIT_IO,
+			    "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
+			    run->exit_reason,
+			    exit_reason_str(run->exit_reason));
+
+		switch (get_ucall(vm, VCPU_ID, &uc)) {
+		case UCALL_ABORT:
+			TEST_ASSERT(false, "%s",
+				    (const char *)uc.args[0]);
+			/* NOT REACHED */
+		case UCALL_SYNC:
+			break;
+		case UCALL_DONE:
+			goto done;
+		default:
+			TEST_ASSERT(false,
+				    "Unknown ucall 0x%x.", uc.cmd);
+		}
+	}
+done:
+	kvm_vm_free(vm);
+	return 0;
+}
--=20
2.20.1