69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* ucall support. A ucall is a "hypercall to userspace".
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*
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* Copyright (C) 2021 Western Digital Corporation or its affiliates.
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*/
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#include <linux/kvm.h>
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#include "kvm_util.h"
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#include "processor.h"
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void ucall_arch_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa)
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{
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}
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struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
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unsigned long arg1, unsigned long arg2,
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unsigned long arg3, unsigned long arg4,
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unsigned long arg5)
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{
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register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);
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register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);
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register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);
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register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3);
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register uintptr_t a4 asm ("a4") = (uintptr_t)(arg4);
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register uintptr_t a5 asm ("a5") = (uintptr_t)(arg5);
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register uintptr_t a6 asm ("a6") = (uintptr_t)(fid);
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register uintptr_t a7 asm ("a7") = (uintptr_t)(ext);
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struct sbiret ret;
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asm volatile (
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"ecall"
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: "+r" (a0), "+r" (a1)
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: "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7)
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: "memory");
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ret.error = a0;
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ret.value = a1;
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return ret;
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}
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void ucall_arch_do_ucall(vm_vaddr_t uc)
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{
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sbi_ecall(KVM_RISCV_SELFTESTS_SBI_EXT,
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KVM_RISCV_SELFTESTS_SBI_UCALL,
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uc, 0, 0, 0, 0, 0);
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}
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void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu)
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{
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struct kvm_run *run = vcpu->run;
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if (run->exit_reason == KVM_EXIT_RISCV_SBI &&
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run->riscv_sbi.extension_id == KVM_RISCV_SELFTESTS_SBI_EXT) {
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switch (run->riscv_sbi.function_id) {
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case KVM_RISCV_SELFTESTS_SBI_UCALL:
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return (void *)run->riscv_sbi.args[0];
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case KVM_RISCV_SELFTESTS_SBI_UNEXP:
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vcpu_dump(stderr, vcpu, 2);
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TEST_ASSERT(0, "Unexpected trap taken by guest");
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break;
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default:
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break;
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}
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}
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return NULL;
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}
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