33 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * ucall support. A ucall is a "hypercall to userspace".4 *5 * Copyright (C) 2021 Western Digital Corporation or its affiliates.6 */7 8#include <linux/kvm.h>9 10#include "kvm_util.h"11#include "processor.h"12#include "sbi.h"13 14void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu)15{16 struct kvm_run *run = vcpu->run;17 18 if (run->exit_reason == KVM_EXIT_RISCV_SBI &&19 run->riscv_sbi.extension_id == KVM_RISCV_SELFTESTS_SBI_EXT) {20 switch (run->riscv_sbi.function_id) {21 case KVM_RISCV_SELFTESTS_SBI_UCALL:22 return (void *)run->riscv_sbi.args[0];23 case KVM_RISCV_SELFTESTS_SBI_UNEXP:24 vcpu_dump(stderr, vcpu, 2);25 TEST_ASSERT(0, "Unexpected trap taken by guest");26 break;27 default:28 break;29 }30 }31 return NULL;32}33