18c2ecf20Sopenharmony_ci/* 28c2ecf20Sopenharmony_ci * This file is subject to the terms and conditions of the GNU General Public 38c2ecf20Sopenharmony_ci * License. See the file "COPYING" in the main directory of this archive 48c2ecf20Sopenharmony_ci * for more details. 58c2ecf20Sopenharmony_ci * 68c2ecf20Sopenharmony_ci * KVM/MIPS: Hypercall handling. 78c2ecf20Sopenharmony_ci * 88c2ecf20Sopenharmony_ci * Copyright (C) 2015 Imagination Technologies Ltd. 98c2ecf20Sopenharmony_ci */ 108c2ecf20Sopenharmony_ci 118c2ecf20Sopenharmony_ci#include <linux/kernel.h> 128c2ecf20Sopenharmony_ci#include <linux/kvm_host.h> 138c2ecf20Sopenharmony_ci#include <linux/kvm_para.h> 148c2ecf20Sopenharmony_ci 158c2ecf20Sopenharmony_ci#define MAX_HYPCALL_ARGS 4 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_cienum emulation_result kvm_mips_emul_hypcall(struct kvm_vcpu *vcpu, 188c2ecf20Sopenharmony_ci union mips_instruction inst) 198c2ecf20Sopenharmony_ci{ 208c2ecf20Sopenharmony_ci unsigned int code = (inst.co_format.code >> 5) & 0x3ff; 218c2ecf20Sopenharmony_ci 228c2ecf20Sopenharmony_ci kvm_debug("[%#lx] HYPCALL %#03x\n", vcpu->arch.pc, code); 238c2ecf20Sopenharmony_ci 248c2ecf20Sopenharmony_ci switch (code) { 258c2ecf20Sopenharmony_ci case 0: 268c2ecf20Sopenharmony_ci return EMULATE_HYPERCALL; 278c2ecf20Sopenharmony_ci default: 288c2ecf20Sopenharmony_ci return EMULATE_FAIL; 298c2ecf20Sopenharmony_ci }; 308c2ecf20Sopenharmony_ci} 318c2ecf20Sopenharmony_ci 328c2ecf20Sopenharmony_cistatic int kvm_mips_hypercall(struct kvm_vcpu *vcpu, unsigned long num, 338c2ecf20Sopenharmony_ci const unsigned long *args, unsigned long *hret) 348c2ecf20Sopenharmony_ci{ 358c2ecf20Sopenharmony_ci /* Report unimplemented hypercall to guest */ 368c2ecf20Sopenharmony_ci *hret = -KVM_ENOSYS; 378c2ecf20Sopenharmony_ci return RESUME_GUEST; 388c2ecf20Sopenharmony_ci} 398c2ecf20Sopenharmony_ci 408c2ecf20Sopenharmony_ciint kvm_mips_handle_hypcall(struct kvm_vcpu *vcpu) 418c2ecf20Sopenharmony_ci{ 428c2ecf20Sopenharmony_ci unsigned long num, args[MAX_HYPCALL_ARGS]; 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ci /* read hypcall number and arguments */ 458c2ecf20Sopenharmony_ci num = vcpu->arch.gprs[2]; /* v0 */ 468c2ecf20Sopenharmony_ci args[0] = vcpu->arch.gprs[4]; /* a0 */ 478c2ecf20Sopenharmony_ci args[1] = vcpu->arch.gprs[5]; /* a1 */ 488c2ecf20Sopenharmony_ci args[2] = vcpu->arch.gprs[6]; /* a2 */ 498c2ecf20Sopenharmony_ci args[3] = vcpu->arch.gprs[7]; /* a3 */ 508c2ecf20Sopenharmony_ci 518c2ecf20Sopenharmony_ci return kvm_mips_hypercall(vcpu, num, 528c2ecf20Sopenharmony_ci args, &vcpu->arch.gprs[2] /* v0 */); 538c2ecf20Sopenharmony_ci} 54