1*955d8dc3SJames Hogan /*
2*955d8dc3SJames Hogan * This file is subject to the terms and conditions of the GNU General Public
3*955d8dc3SJames Hogan * License. See the file "COPYING" in the main directory of this archive
4*955d8dc3SJames Hogan * for more details.
5*955d8dc3SJames Hogan *
6*955d8dc3SJames Hogan * KVM/MIPS: Hypercall handling.
7*955d8dc3SJames Hogan *
8*955d8dc3SJames Hogan * Copyright (C) 2015 Imagination Technologies Ltd.
9*955d8dc3SJames Hogan */
10*955d8dc3SJames Hogan
11*955d8dc3SJames Hogan #include <linux/kernel.h>
12*955d8dc3SJames Hogan #include <linux/kvm_host.h>
13*955d8dc3SJames Hogan #include <linux/kvm_para.h>
14*955d8dc3SJames Hogan
15*955d8dc3SJames Hogan #define MAX_HYPCALL_ARGS 4
16*955d8dc3SJames Hogan
kvm_mips_emul_hypcall(struct kvm_vcpu * vcpu,union mips_instruction inst)17*955d8dc3SJames Hogan enum emulation_result kvm_mips_emul_hypcall(struct kvm_vcpu *vcpu,
18*955d8dc3SJames Hogan union mips_instruction inst)
19*955d8dc3SJames Hogan {
20*955d8dc3SJames Hogan unsigned int code = (inst.co_format.code >> 5) & 0x3ff;
21*955d8dc3SJames Hogan
22*955d8dc3SJames Hogan kvm_debug("[%#lx] HYPCALL %#03x\n", vcpu->arch.pc, code);
23*955d8dc3SJames Hogan
24*955d8dc3SJames Hogan switch (code) {
25*955d8dc3SJames Hogan case 0:
26*955d8dc3SJames Hogan return EMULATE_HYPERCALL;
27*955d8dc3SJames Hogan default:
28*955d8dc3SJames Hogan return EMULATE_FAIL;
29*955d8dc3SJames Hogan };
30*955d8dc3SJames Hogan }
31*955d8dc3SJames Hogan
kvm_mips_hypercall(struct kvm_vcpu * vcpu,unsigned long num,const unsigned long * args,unsigned long * hret)32*955d8dc3SJames Hogan static int kvm_mips_hypercall(struct kvm_vcpu *vcpu, unsigned long num,
33*955d8dc3SJames Hogan const unsigned long *args, unsigned long *hret)
34*955d8dc3SJames Hogan {
35*955d8dc3SJames Hogan /* Report unimplemented hypercall to guest */
36*955d8dc3SJames Hogan *hret = -KVM_ENOSYS;
37*955d8dc3SJames Hogan return RESUME_GUEST;
38*955d8dc3SJames Hogan }
39*955d8dc3SJames Hogan
kvm_mips_handle_hypcall(struct kvm_vcpu * vcpu)40*955d8dc3SJames Hogan int kvm_mips_handle_hypcall(struct kvm_vcpu *vcpu)
41*955d8dc3SJames Hogan {
42*955d8dc3SJames Hogan unsigned long num, args[MAX_HYPCALL_ARGS];
43*955d8dc3SJames Hogan
44*955d8dc3SJames Hogan /* read hypcall number and arguments */
45*955d8dc3SJames Hogan num = vcpu->arch.gprs[2]; /* v0 */
46*955d8dc3SJames Hogan args[0] = vcpu->arch.gprs[4]; /* a0 */
47*955d8dc3SJames Hogan args[1] = vcpu->arch.gprs[5]; /* a1 */
48*955d8dc3SJames Hogan args[2] = vcpu->arch.gprs[6]; /* a2 */
49*955d8dc3SJames Hogan args[3] = vcpu->arch.gprs[7]; /* a3 */
50*955d8dc3SJames Hogan
51*955d8dc3SJames Hogan return kvm_mips_hypercall(vcpu, num,
52*955d8dc3SJames Hogan args, &vcpu->arch.gprs[2] /* v0 */);
53*955d8dc3SJames Hogan }
54