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955d8dc3 JH |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * KVM/MIPS: Hypercall handling. | |
7 | * | |
8 | * Copyright (C) 2015 Imagination Technologies Ltd. | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/kvm_host.h> | |
13 | #include <linux/kvm_para.h> | |
14 | ||
15 | #define MAX_HYPCALL_ARGS 4 | |
16 | ||
17 | enum emulation_result kvm_mips_emul_hypcall(struct kvm_vcpu *vcpu, | |
18 | union mips_instruction inst) | |
19 | { | |
20 | unsigned int code = (inst.co_format.code >> 5) & 0x3ff; | |
21 | ||
22 | kvm_debug("[%#lx] HYPCALL %#03x\n", vcpu->arch.pc, code); | |
23 | ||
24 | switch (code) { | |
25 | case 0: | |
26 | return EMULATE_HYPERCALL; | |
27 | default: | |
28 | return EMULATE_FAIL; | |
29 | }; | |
30 | } | |
31 | ||
32 | static int kvm_mips_hypercall(struct kvm_vcpu *vcpu, unsigned long num, | |
33 | const unsigned long *args, unsigned long *hret) | |
34 | { | |
35 | /* Report unimplemented hypercall to guest */ | |
36 | *hret = -KVM_ENOSYS; | |
37 | return RESUME_GUEST; | |
38 | } | |
39 | ||
40 | int kvm_mips_handle_hypcall(struct kvm_vcpu *vcpu) | |
41 | { | |
42 | unsigned long num, args[MAX_HYPCALL_ARGS]; | |
43 | ||
44 | /* read hypcall number and arguments */ | |
45 | num = vcpu->arch.gprs[2]; /* v0 */ | |
46 | args[0] = vcpu->arch.gprs[4]; /* a0 */ | |
47 | args[1] = vcpu->arch.gprs[5]; /* a1 */ | |
48 | args[2] = vcpu->arch.gprs[6]; /* a2 */ | |
49 | args[3] = vcpu->arch.gprs[7]; /* a3 */ | |
50 | ||
51 | return kvm_mips_hypercall(vcpu, num, | |
52 | args, &vcpu->arch.gprs[2] /* v0 */); | |
53 | } |