54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* KVM/MIPS: Hypercall handling.
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*
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* Copyright (C) 2015 Imagination Technologies Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/kvm_host.h>
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#include <linux/kvm_para.h>
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#define MAX_HYPCALL_ARGS 4
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enum emulation_result kvm_mips_emul_hypcall(struct kvm_vcpu *vcpu,
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union mips_instruction inst)
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{
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unsigned int code = (inst.co_format.code >> 5) & 0x3ff;
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kvm_debug("[%#lx] HYPCALL %#03x\n", vcpu->arch.pc, code);
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switch (code) {
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case 0:
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return EMULATE_HYPERCALL;
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default:
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return EMULATE_FAIL;
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};
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}
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static int kvm_mips_hypercall(struct kvm_vcpu *vcpu, unsigned long num,
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const unsigned long *args, unsigned long *hret)
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{
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/* Report unimplemented hypercall to guest */
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*hret = -KVM_ENOSYS;
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return RESUME_GUEST;
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}
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int kvm_mips_handle_hypcall(struct kvm_vcpu *vcpu)
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{
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unsigned long num, args[MAX_HYPCALL_ARGS];
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/* read hypcall number and arguments */
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num = vcpu->arch.gprs[2]; /* v0 */
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args[0] = vcpu->arch.gprs[4]; /* a0 */
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args[1] = vcpu->arch.gprs[5]; /* a1 */
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args[2] = vcpu->arch.gprs[6]; /* a2 */
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args[3] = vcpu->arch.gprs[7]; /* a3 */
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return kvm_mips_hypercall(vcpu, num,
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args, &vcpu->arch.gprs[2] /* v0 */);
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}
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