| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* |
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| 3 | * ucall support. A ucall is a "hypercall to userspace". |
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| 4 | * |
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| 5 | * Copyright (C) 2021 Western Digital Corporation or its affiliates. |
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| 6 | */ |
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| 7 | |
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| 8 | #include <linux/kvm.h> |
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| 9 | |
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| 10 | #include "kvm_util.h" |
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| 11 | #include "processor.h" |
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| 12 | #include "sbi.h" |
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| 13 | |
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| 14 | void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu) |
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| 15 | { |
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| 16 | struct kvm_run *run = vcpu->run; |
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| 17 | |
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| 18 | if (run->exit_reason == KVM_EXIT_RISCV_SBI && |
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| 19 | run->riscv_sbi.extension_id == KVM_RISCV_SELFTESTS_SBI_EXT) { |
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| 20 | switch (run->riscv_sbi.function_id) { |
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| 21 | case KVM_RISCV_SELFTESTS_SBI_UCALL: |
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| 22 | return (void *)run->riscv_sbi.args[0]; |
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| 23 | case KVM_RISCV_SELFTESTS_SBI_UNEXP: |
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| 24 | vcpu_dump(stderr, vcpu, 2); |
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| 25 | TEST_ASSERT(0, "Unexpected trap taken by guest" ); |
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| 26 | break; |
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| 27 | default: |
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| 28 | break; |
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| 29 | } |
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| 30 | } |
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| 31 | return NULL; |
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| 32 | } |
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| 33 | |
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