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29eb61bc AG |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License, version 2, as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * You should have received a copy of the GNU General Public License | |
12 | * along with this program; if not, write to the Free Software | |
13 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
14 | * | |
15 | * Copyright SUSE Linux Products GmbH 2009 | |
16 | * | |
17 | * Authors: Alexander Graf <agraf@suse.de> | |
18 | */ | |
19 | ||
20 | #include <asm/ppc_asm.h> | |
21 | #include <asm/kvm_asm.h> | |
22 | #include <asm/reg.h> | |
23 | #include <asm/page.h> | |
24 | #include <asm/asm-offsets.h> | |
25 | #include <asm/exception-64s.h> | |
26 | ||
b79fcdf6 | 27 | #if defined(CONFIG_PPC_BOOK3S_64) |
b79fcdf6 | 28 | #define FUNC(name) GLUE(.,name) |
b79fcdf6 | 29 | #elif defined(CONFIG_PPC_BOOK3S_32) |
b79fcdf6 | 30 | #define FUNC(name) name |
b79fcdf6 AG |
31 | #endif /* CONFIG_PPC_BOOK3S_XX */ |
32 | ||
97c4cfbe | 33 | #define VCPU_LOAD_NVGPRS(vcpu) \ |
c75df6f9 MN |
34 | PPC_LL r14, VCPU_GPR(R14)(vcpu); \ |
35 | PPC_LL r15, VCPU_GPR(R15)(vcpu); \ | |
36 | PPC_LL r16, VCPU_GPR(R16)(vcpu); \ | |
37 | PPC_LL r17, VCPU_GPR(R17)(vcpu); \ | |
38 | PPC_LL r18, VCPU_GPR(R18)(vcpu); \ | |
39 | PPC_LL r19, VCPU_GPR(R19)(vcpu); \ | |
40 | PPC_LL r20, VCPU_GPR(R20)(vcpu); \ | |
41 | PPC_LL r21, VCPU_GPR(R21)(vcpu); \ | |
42 | PPC_LL r22, VCPU_GPR(R22)(vcpu); \ | |
43 | PPC_LL r23, VCPU_GPR(R23)(vcpu); \ | |
44 | PPC_LL r24, VCPU_GPR(R24)(vcpu); \ | |
45 | PPC_LL r25, VCPU_GPR(R25)(vcpu); \ | |
46 | PPC_LL r26, VCPU_GPR(R26)(vcpu); \ | |
47 | PPC_LL r27, VCPU_GPR(R27)(vcpu); \ | |
48 | PPC_LL r28, VCPU_GPR(R28)(vcpu); \ | |
49 | PPC_LL r29, VCPU_GPR(R29)(vcpu); \ | |
50 | PPC_LL r30, VCPU_GPR(R30)(vcpu); \ | |
51 | PPC_LL r31, VCPU_GPR(R31)(vcpu); \ | |
97c4cfbe | 52 | |
29eb61bc AG |
53 | /***************************************************************************** |
54 | * * | |
55 | * Guest entry / exit code that is in kernel module memory (highmem) * | |
56 | * * | |
57 | ****************************************************************************/ | |
58 | ||
59 | /* Registers: | |
60 | * r3: kvm_run pointer | |
61 | * r4: vcpu pointer | |
62 | */ | |
df6909e5 | 63 | _GLOBAL(__kvmppc_vcpu_run) |
29eb61bc AG |
64 | |
65 | kvm_start_entry: | |
66 | /* Write correct stack frame */ | |
b79fcdf6 AG |
67 | mflr r0 |
68 | PPC_STL r0,PPC_LR_STKOFF(r1) | |
29eb61bc AG |
69 | |
70 | /* Save host state to the stack */ | |
b79fcdf6 | 71 | PPC_STLU r1, -SWITCH_FRAME_SIZE(r1) |
29eb61bc AG |
72 | |
73 | /* Save r3 (kvm_run) and r4 (vcpu) */ | |
74 | SAVE_2GPRS(3, r1) | |
75 | ||
76 | /* Save non-volatile registers (r14 - r31) */ | |
77 | SAVE_NVGPRS(r1) | |
78 | ||
e1f8acf8 AG |
79 | /* Save CR */ |
80 | mfcr r14 | |
81 | stw r14, _CCR(r1) | |
82 | ||
29eb61bc | 83 | /* Save LR */ |
b79fcdf6 | 84 | PPC_STL r0, _LINK(r1) |
97c4cfbe AG |
85 | |
86 | /* Load non-volatile guest state from the vcpu */ | |
87 | VCPU_LOAD_NVGPRS(r4) | |
29eb61bc | 88 | |
3c42bf8a | 89 | kvm_start_lightweight: |
7e57cba0 | 90 | |
b79fcdf6 | 91 | #ifdef CONFIG_PPC_BOOK3S_64 |
b79fcdf6 | 92 | PPC_LL r3, VCPU_HFLAGS(r4) |
02143947 PM |
93 | rldicl r3, r3, 0, 63 /* r3 &= 1 */ |
94 | stb r3, HSTATE_RESTORE_HID5(r13) | |
b79fcdf6 AG |
95 | #endif /* CONFIG_PPC_BOOK3S_64 */ |
96 | ||
02143947 | 97 | PPC_LL r4, VCPU_SHADOW_MSR(r4) /* get shadow_msr */ |
7e57cba0 | 98 | |
b79fcdf6 | 99 | /* Jump to segment patching handler and into our guest */ |
02143947 PM |
100 | bl FUNC(kvmppc_entry_trampoline) |
101 | nop | |
29eb61bc AG |
102 | |
103 | /* | |
104 | * This is the handler in module memory. It gets jumped at from the | |
105 | * lowmem trampoline code, so it's basically the guest exit code. | |
106 | * | |
107 | */ | |
108 | ||
109 | .global kvmppc_handler_highmem | |
110 | kvmppc_handler_highmem: | |
111 | ||
112 | /* | |
113 | * Register usage at this point: | |
114 | * | |
b79fcdf6 AG |
115 | * R1 = host R1 |
116 | * R2 = host R2 | |
117 | * R12 = exit handler id | |
118 | * R13 = PACA | |
119 | * SVCPU.* = guest * | |
29eb61bc AG |
120 | * |
121 | */ | |
122 | ||
7e57cba0 | 123 | /* R7 = vcpu */ |
b79fcdf6 | 124 | PPC_LL r7, GPR4(r1) |
29eb61bc | 125 | |
c75df6f9 MN |
126 | PPC_STL r14, VCPU_GPR(R14)(r7) |
127 | PPC_STL r15, VCPU_GPR(R15)(r7) | |
128 | PPC_STL r16, VCPU_GPR(R16)(r7) | |
129 | PPC_STL r17, VCPU_GPR(R17)(r7) | |
130 | PPC_STL r18, VCPU_GPR(R18)(r7) | |
131 | PPC_STL r19, VCPU_GPR(R19)(r7) | |
132 | PPC_STL r20, VCPU_GPR(R20)(r7) | |
133 | PPC_STL r21, VCPU_GPR(R21)(r7) | |
134 | PPC_STL r22, VCPU_GPR(R22)(r7) | |
135 | PPC_STL r23, VCPU_GPR(R23)(r7) | |
136 | PPC_STL r24, VCPU_GPR(R24)(r7) | |
137 | PPC_STL r25, VCPU_GPR(R25)(r7) | |
138 | PPC_STL r26, VCPU_GPR(R26)(r7) | |
139 | PPC_STL r27, VCPU_GPR(R27)(r7) | |
140 | PPC_STL r28, VCPU_GPR(R28)(r7) | |
141 | PPC_STL r29, VCPU_GPR(R29)(r7) | |
142 | PPC_STL r30, VCPU_GPR(R30)(r7) | |
143 | PPC_STL r31, VCPU_GPR(R31)(r7) | |
29eb61bc | 144 | |
97c4cfbe | 145 | /* Pass the exit number as 3rd argument to kvmppc_handle_exit */ |
7e57cba0 | 146 | mr r5, r12 |
97c4cfbe | 147 | |
29eb61bc AG |
148 | /* Restore r3 (kvm_run) and r4 (vcpu) */ |
149 | REST_2GPRS(3, r1) | |
b79fcdf6 | 150 | bl FUNC(kvmppc_handle_exit) |
29eb61bc | 151 | |
97c4cfbe | 152 | /* If RESUME_GUEST, get back in the loop */ |
29eb61bc | 153 | cmpwi r3, RESUME_GUEST |
97c4cfbe | 154 | beq kvm_loop_lightweight |
29eb61bc | 155 | |
97c4cfbe AG |
156 | cmpwi r3, RESUME_GUEST_NV |
157 | beq kvm_loop_heavyweight | |
29eb61bc | 158 | |
97c4cfbe | 159 | kvm_exit_loop: |
29eb61bc | 160 | |
b79fcdf6 | 161 | PPC_LL r4, _LINK(r1) |
29eb61bc AG |
162 | mtlr r4 |
163 | ||
e1f8acf8 AG |
164 | lwz r14, _CCR(r1) |
165 | mtcr r14 | |
166 | ||
97c4cfbe AG |
167 | /* Restore non-volatile host registers (r14 - r31) */ |
168 | REST_NVGPRS(r1) | |
169 | ||
170 | addi r1, r1, SWITCH_FRAME_SIZE | |
171 | blr | |
172 | ||
173 | kvm_loop_heavyweight: | |
29eb61bc | 174 | |
b79fcdf6 AG |
175 | PPC_LL r4, _LINK(r1) |
176 | PPC_STL r4, (PPC_LR_STKOFF + SWITCH_FRAME_SIZE)(r1) | |
97c4cfbe AG |
177 | |
178 | /* Load vcpu and cpu_run */ | |
29eb61bc AG |
179 | REST_2GPRS(3, r1) |
180 | ||
97c4cfbe AG |
181 | /* Load non-volatile guest state from the vcpu */ |
182 | VCPU_LOAD_NVGPRS(r4) | |
29eb61bc | 183 | |
97c4cfbe AG |
184 | /* Jump back into the beginning of this function */ |
185 | b kvm_start_lightweight | |
29eb61bc | 186 | |
97c4cfbe | 187 | kvm_loop_lightweight: |
29eb61bc | 188 | |
97c4cfbe AG |
189 | /* We'll need the vcpu pointer */ |
190 | REST_GPR(4, r1) | |
191 | ||
192 | /* Jump back into the beginning of this function */ | |
193 | b kvm_start_lightweight |