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3414bbff MZ |
1 | /* |
2 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University | |
3 | * Author: Christoffer Dall <c.dall@virtualopensystems.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License, version 2, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/kvm.h> | |
20 | #include <linux/kvm_host.h> | |
21 | #include <asm/kvm_emulate.h> | |
22 | #include <asm/kvm_coproc.h> | |
23 | #include <asm/kvm_mmu.h> | |
24 | #include <asm/kvm_psci.h> | |
25 | ||
26 | typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *); | |
27 | ||
28 | static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
29 | { | |
30 | /* SVC called from Hyp mode should never get here */ | |
31 | kvm_debug("SVC called from Hyp mode shouldn't go here\n"); | |
32 | BUG(); | |
33 | return -EINVAL; /* Squash warning */ | |
34 | } | |
35 | ||
36 | static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
37 | { | |
38 | if (kvm_psci_call(vcpu)) | |
39 | return 1; | |
40 | ||
41 | kvm_inject_undefined(vcpu); | |
42 | return 1; | |
43 | } | |
44 | ||
45 | static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
46 | { | |
47 | if (kvm_psci_call(vcpu)) | |
48 | return 1; | |
49 | ||
50 | kvm_inject_undefined(vcpu); | |
51 | return 1; | |
52 | } | |
53 | ||
54 | static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
55 | { | |
56 | /* The hypervisor should never cause aborts */ | |
57 | kvm_err("Prefetch Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n", | |
58 | kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu)); | |
59 | return -EFAULT; | |
60 | } | |
61 | ||
62 | static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
63 | { | |
64 | /* This is either an error in the ws. code or an external abort */ | |
65 | kvm_err("Data Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n", | |
66 | kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu)); | |
67 | return -EFAULT; | |
68 | } | |
69 | ||
70 | static exit_handle_fn arm_exit_handlers[] = { | |
71 | [HSR_EC_WFI] = kvm_handle_wfi, | |
72 | [HSR_EC_CP15_32] = kvm_handle_cp15_32, | |
73 | [HSR_EC_CP15_64] = kvm_handle_cp15_64, | |
74 | [HSR_EC_CP14_MR] = kvm_handle_cp14_access, | |
75 | [HSR_EC_CP14_LS] = kvm_handle_cp14_load_store, | |
76 | [HSR_EC_CP14_64] = kvm_handle_cp14_access, | |
77 | [HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access, | |
78 | [HSR_EC_CP10_ID] = kvm_handle_cp10_id, | |
79 | [HSR_EC_SVC_HYP] = handle_svc_hyp, | |
80 | [HSR_EC_HVC] = handle_hvc, | |
81 | [HSR_EC_SMC] = handle_smc, | |
82 | [HSR_EC_IABT] = kvm_handle_guest_abort, | |
83 | [HSR_EC_IABT_HYP] = handle_pabt_hyp, | |
84 | [HSR_EC_DABT] = kvm_handle_guest_abort, | |
85 | [HSR_EC_DABT_HYP] = handle_dabt_hyp, | |
86 | }; | |
87 | ||
88 | static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu) | |
89 | { | |
90 | u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); | |
91 | ||
92 | if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) || | |
93 | !arm_exit_handlers[hsr_ec]) { | |
94 | kvm_err("Unkown exception class: hsr: %#08x\n", | |
95 | (unsigned int)kvm_vcpu_get_hsr(vcpu)); | |
96 | BUG(); | |
97 | } | |
98 | ||
99 | return arm_exit_handlers[hsr_ec]; | |
100 | } | |
101 | ||
102 | /* | |
103 | * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on | |
104 | * proper exit to userspace. | |
105 | */ | |
106 | int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, | |
107 | int exception_index) | |
108 | { | |
109 | exit_handle_fn exit_handler; | |
110 | ||
111 | switch (exception_index) { | |
112 | case ARM_EXCEPTION_IRQ: | |
113 | return 1; | |
114 | case ARM_EXCEPTION_UNDEFINED: | |
115 | kvm_err("Undefined exception in Hyp mode at: %#08lx\n", | |
116 | kvm_vcpu_get_hyp_pc(vcpu)); | |
117 | BUG(); | |
118 | panic("KVM: Hypervisor undefined exception!\n"); | |
119 | case ARM_EXCEPTION_DATA_ABORT: | |
120 | case ARM_EXCEPTION_PREF_ABORT: | |
121 | case ARM_EXCEPTION_HVC: | |
122 | /* | |
123 | * See ARM ARM B1.14.1: "Hyp traps on instructions | |
124 | * that fail their condition code check" | |
125 | */ | |
126 | if (!kvm_condition_valid(vcpu)) { | |
127 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); | |
128 | return 1; | |
129 | } | |
130 | ||
131 | exit_handler = kvm_get_exit_handler(vcpu); | |
132 | ||
133 | return exit_handler(vcpu, run); | |
134 | default: | |
135 | kvm_pr_unimpl("Unsupported exception type: %d", | |
136 | exception_index); | |
137 | run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
138 | return 0; | |
139 | } | |
140 | } |