selftests: KVM: SVM: Add vmcall test

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>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Tested-by: Wei Huang <wei.huang2@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index fb2fa62..d91c53b 100644 (file)
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -26,6 +26,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/vmx_dirty_log_test
 TEST_GEN_PROGS_x86_64 += x86_64/vmx_set_nested_state_test
 TEST_GEN_PROGS_x86_64 += x86_64/vmx_tsc_adjust_test
 TEST_GEN_PROGS_x86_64 += x86_64/xss_msr_test
+TEST_GEN_PROGS_x86_64 += x86_64/svm_vmcall_test
 TEST_GEN_PROGS_x86_64 += clear_dirty_log_test
 TEST_GEN_PROGS_x86_64 += dirty_log_test
 TEST_GEN_PROGS_x86_64 += 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 (file)
index 0000000..e280f68
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/svm_vmcall_test.c
@@ -0,0 +1,79 @@
+// 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"
+
+#define VCPU_ID                5
+
+static struct kvm_vm *vm;
+
+static void l2_guest_code(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 = svm->vmcb;
+
+       /* Prepare for L2 execution. */
+       generic_svm_setup(svm, l2_guest_code,
+                         &l2_guest_stack[L2_GUEST_STACK_SIZE]);
+
+       run_guest(vmcb, svm->vmcb_gpa);
+
+       GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
+       GUEST_DONE();
+}
+
+int main(int argc, char *argv[])
+{
+       vm_vaddr_t svm_gva;
+
+       nested_svm_check_supported();
+
+       vm = 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 = vcpu_state(vm, VCPU_ID);
+               struct ucall uc;
+
+               vcpu_run(vm, VCPU_ID);
+               TEST_ASSERT(run->exit_reason == 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;
+}