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8a061562e2
We add an extensible CSR emulation framework which is based upon the existing system instruction emulation. This will be useful to upcoming AIA, PMU, Nested and other virtualization features. The CSR emulation framework also has provision to emulate CSR in user space but this will be used only in very specific cases such as AIA IMSIC CSR emulation in user space or vendor specific CSR emulation in user space. By default, all CSRs not handled by KVM RISC-V will be redirected back to Guest VCPU as illegal instruction trap. Signed-off-by: Anup Patel <apatel@ventanamicro.com> Signed-off-by: Anup Patel <anup@brainfault.org>
49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2022 Ventana Micro Systems Inc.
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*/
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#ifndef __KVM_VCPU_RISCV_INSN_H
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#define __KVM_VCPU_RISCV_INSN_H
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struct kvm_vcpu;
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struct kvm_run;
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struct kvm_cpu_trap;
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struct kvm_mmio_decode {
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unsigned long insn;
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int insn_len;
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int len;
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int shift;
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int return_handled;
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};
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struct kvm_csr_decode {
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unsigned long insn;
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int return_handled;
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};
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/* Return values used by function emulating a particular instruction */
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enum kvm_insn_return {
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KVM_INSN_EXIT_TO_USER_SPACE = 0,
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KVM_INSN_CONTINUE_NEXT_SEPC,
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KVM_INSN_CONTINUE_SAME_SEPC,
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KVM_INSN_ILLEGAL_TRAP,
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KVM_INSN_VIRTUAL_TRAP
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};
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void kvm_riscv_vcpu_wfi(struct kvm_vcpu *vcpu);
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int kvm_riscv_vcpu_csr_return(struct kvm_vcpu *vcpu, struct kvm_run *run);
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int kvm_riscv_vcpu_virtual_insn(struct kvm_vcpu *vcpu, struct kvm_run *run,
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struct kvm_cpu_trap *trap);
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int kvm_riscv_vcpu_mmio_load(struct kvm_vcpu *vcpu, struct kvm_run *run,
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unsigned long fault_addr,
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unsigned long htinst);
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int kvm_riscv_vcpu_mmio_store(struct kvm_vcpu *vcpu, struct kvm_run *run,
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unsigned long fault_addr,
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unsigned long htinst);
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int kvm_riscv_vcpu_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run);
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#endif
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