// 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"

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[])
{
        struct kvm_vcpu *vcpu;
        gva_t svm_gva;
        struct kvm_vm *vm;

        TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));

        vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);

        vcpu_alloc_svm(vm, &svm_gva);
        vcpu_args_set(vcpu, 1, svm_gva);

        for (;;) {
                struct ucall uc;

                vcpu_run(vcpu);
                TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);

                switch (get_ucall(vcpu, &uc)) {
                case UCALL_ABORT:
                        REPORT_GUEST_ASSERT(uc);
                        /* NOT REACHED */
                case UCALL_SYNC:
                        break;
                case UCALL_DONE:
                        goto done;
                default:
                        TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);
                }
        }
done:
        kvm_vm_free(vm);
        return 0;
}