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53 lines
1.3 KiB
53 lines
1.3 KiB
/* |
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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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