kvm tools, setup: Create private directory
[linux-2.6/next.git] / arch / powerpc / kvm / book3s_segment.S
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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 2010
16  *
17  * Authors: Alexander Graf <agraf@suse.de>
18  */
20 /* Real mode helpers */
22 #if defined(CONFIG_PPC_BOOK3S_64)
24 #define GET_SHADOW_VCPU(reg)    \
25         addi    reg, r13, PACA_KVM_SVCPU
27 #elif defined(CONFIG_PPC_BOOK3S_32)
29 #define GET_SHADOW_VCPU(reg)                            \
30         tophys(reg, r2);                        \
31         lwz     reg, (THREAD + THREAD_KVM_SVCPU)(reg);  \
32         tophys(reg, reg)
34 #endif
36 /* Disable for nested KVM */
37 #define USE_QUICK_LAST_INST
40 /* Get helper functions for subarch specific functionality */
42 #if defined(CONFIG_PPC_BOOK3S_64)
43 #include "book3s_64_slb.S"
44 #elif defined(CONFIG_PPC_BOOK3S_32)
45 #include "book3s_32_sr.S"
46 #endif
48 /******************************************************************************
49  *                                                                            *
50  *                               Entry code                                   *
51  *                                                                            *
52  *****************************************************************************/
54 .global kvmppc_handler_trampoline_enter
55 kvmppc_handler_trampoline_enter:
57         /* Required state:
58          *
59          * MSR = ~IR|DR
60          * R13 = PACA
61          * R1 = host R1
62          * R2 = host R2
63          * R10 = guest MSR
64          * all other volatile GPRS = free
65          * SVCPU[CR] = guest CR
66          * SVCPU[XER] = guest XER
67          * SVCPU[CTR] = guest CTR
68          * SVCPU[LR] = guest LR
69          */
71         /* r3 = shadow vcpu */
72         GET_SHADOW_VCPU(r3)
74         /* Move SRR0 and SRR1 into the respective regs */
75         PPC_LL  r9, SVCPU_PC(r3)
76         mtsrr0  r9
77         mtsrr1  r10
79         /* Activate guest mode, so faults get handled by KVM */
80         li      r11, KVM_GUEST_MODE_GUEST
81         stb     r11, SVCPU_IN_GUEST(r3)
83         /* Switch to guest segment. This is subarch specific. */
84         LOAD_GUEST_SEGMENTS
86         /* Enter guest */
88         PPC_LL  r4, (SVCPU_CTR)(r3)
89         PPC_LL  r5, (SVCPU_LR)(r3)
90         lwz     r6, (SVCPU_CR)(r3)
91         lwz     r7, (SVCPU_XER)(r3)
93         mtctr   r4
94         mtlr    r5
95         mtcr    r6
96         mtxer   r7
98         PPC_LL  r0, (SVCPU_R0)(r3)
99         PPC_LL  r1, (SVCPU_R1)(r3)
100         PPC_LL  r2, (SVCPU_R2)(r3)
101         PPC_LL  r4, (SVCPU_R4)(r3)
102         PPC_LL  r5, (SVCPU_R5)(r3)
103         PPC_LL  r6, (SVCPU_R6)(r3)
104         PPC_LL  r7, (SVCPU_R7)(r3)
105         PPC_LL  r8, (SVCPU_R8)(r3)
106         PPC_LL  r9, (SVCPU_R9)(r3)
107         PPC_LL  r10, (SVCPU_R10)(r3)
108         PPC_LL  r11, (SVCPU_R11)(r3)
109         PPC_LL  r12, (SVCPU_R12)(r3)
110         PPC_LL  r13, (SVCPU_R13)(r3)
112         PPC_LL  r3, (SVCPU_R3)(r3)
114         RFI
115 kvmppc_handler_trampoline_enter_end:
119 /******************************************************************************
120  *                                                                            *
121  *                               Exit code                                    *
122  *                                                                            *
123  *****************************************************************************/
125 .global kvmppc_handler_trampoline_exit
126 kvmppc_handler_trampoline_exit:
128         /* Register usage at this point:
129          *
130          * SPRG_SCRATCH0  = guest R13
131          * R12            = exit handler id
132          * R13            = shadow vcpu - SHADOW_VCPU_OFF [=PACA on PPC64]
133          * SVCPU.SCRATCH0 = guest R12
134          * SVCPU.SCRATCH1 = guest CR
135          *
136          */
138         /* Save registers */
140         PPC_STL r0, (SHADOW_VCPU_OFF + SVCPU_R0)(r13)
141         PPC_STL r1, (SHADOW_VCPU_OFF + SVCPU_R1)(r13)
142         PPC_STL r2, (SHADOW_VCPU_OFF + SVCPU_R2)(r13)
143         PPC_STL r3, (SHADOW_VCPU_OFF + SVCPU_R3)(r13)
144         PPC_STL r4, (SHADOW_VCPU_OFF + SVCPU_R4)(r13)
145         PPC_STL r5, (SHADOW_VCPU_OFF + SVCPU_R5)(r13)
146         PPC_STL r6, (SHADOW_VCPU_OFF + SVCPU_R6)(r13)
147         PPC_STL r7, (SHADOW_VCPU_OFF + SVCPU_R7)(r13)
148         PPC_STL r8, (SHADOW_VCPU_OFF + SVCPU_R8)(r13)
149         PPC_STL r9, (SHADOW_VCPU_OFF + SVCPU_R9)(r13)
150         PPC_STL r10, (SHADOW_VCPU_OFF + SVCPU_R10)(r13)
151         PPC_STL r11, (SHADOW_VCPU_OFF + SVCPU_R11)(r13)
153         /* Restore R1/R2 so we can handle faults */
154         PPC_LL  r1, (SHADOW_VCPU_OFF + SVCPU_HOST_R1)(r13)
155         PPC_LL  r2, (SHADOW_VCPU_OFF + SVCPU_HOST_R2)(r13)
157         /* Save guest PC and MSR */
158         andi.   r0,r12,0x2
159         beq     1f
160         mfspr   r3,SPRN_HSRR0
161         mfspr   r4,SPRN_HSRR1
162         andi.   r12,r12,0x3ffd
163         b       2f
164 1:      mfsrr0  r3
165         mfsrr1  r4
167         PPC_STL r3, (SHADOW_VCPU_OFF + SVCPU_PC)(r13)
168         PPC_STL r4, (SHADOW_VCPU_OFF + SVCPU_SHADOW_SRR1)(r13)
170         /* Get scratch'ed off registers */
171         GET_SCRATCH0(r9)
172         PPC_LL  r8, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13)
173         lwz     r7, (SHADOW_VCPU_OFF + SVCPU_SCRATCH1)(r13)
175         PPC_STL r9, (SHADOW_VCPU_OFF + SVCPU_R13)(r13)
176         PPC_STL r8, (SHADOW_VCPU_OFF + SVCPU_R12)(r13)
177         stw     r7, (SHADOW_VCPU_OFF + SVCPU_CR)(r13)
179         /* Save more register state  */
181         mfxer   r5
182         mfdar   r6
183         mfdsisr r7
184         mfctr   r8
185         mflr    r9
187         stw     r5, (SHADOW_VCPU_OFF + SVCPU_XER)(r13)
188         PPC_STL r6, (SHADOW_VCPU_OFF + SVCPU_FAULT_DAR)(r13)
189         stw     r7, (SHADOW_VCPU_OFF + SVCPU_FAULT_DSISR)(r13)
190         PPC_STL r8, (SHADOW_VCPU_OFF + SVCPU_CTR)(r13)
191         PPC_STL r9, (SHADOW_VCPU_OFF + SVCPU_LR)(r13)
193         /*
194          * In order for us to easily get the last instruction,
195          * we got the #vmexit at, we exploit the fact that the
196          * virtual layout is still the same here, so we can just
197          * ld from the guest's PC address
198          */
200         /* We only load the last instruction when it's safe */
201         cmpwi   r12, BOOK3S_INTERRUPT_DATA_STORAGE
202         beq     ld_last_inst
203         cmpwi   r12, BOOK3S_INTERRUPT_PROGRAM
204         beq     ld_last_inst
205         cmpwi   r12, BOOK3S_INTERRUPT_ALIGNMENT
206         beq-    ld_last_inst
208         b       no_ld_last_inst
210 ld_last_inst:
211         /* Save off the guest instruction we're at */
213         /* In case lwz faults */
214         li      r0, KVM_INST_FETCH_FAILED
216 #ifdef USE_QUICK_LAST_INST
218         /* Set guest mode to 'jump over instruction' so if lwz faults
219          * we'll just continue at the next IP. */
220         li      r9, KVM_GUEST_MODE_SKIP
221         stb     r9, (SHADOW_VCPU_OFF + SVCPU_IN_GUEST)(r13)
223         /*    1) enable paging for data */
224         mfmsr   r9
225         ori     r11, r9, MSR_DR                 /* Enable paging for data */
226         mtmsr   r11
227         sync
228         /*    2) fetch the instruction */
229         lwz     r0, 0(r3)
230         /*    3) disable paging again */
231         mtmsr   r9
232         sync
234 #endif
235         stw     r0, (SHADOW_VCPU_OFF + SVCPU_LAST_INST)(r13)
237 no_ld_last_inst:
239         /* Unset guest mode */
240         li      r9, KVM_GUEST_MODE_NONE
241         stb     r9, (SHADOW_VCPU_OFF + SVCPU_IN_GUEST)(r13)
243         /* Switch back to host MMU */
244         LOAD_HOST_SEGMENTS
246         /* Register usage at this point:
247          *
248          * R1       = host R1
249          * R2       = host R2
250          * R12      = exit handler id
251          * R13      = shadow vcpu - SHADOW_VCPU_OFF [=PACA on PPC64]
252          * SVCPU.*  = guest *
253          *
254          */
256         /* RFI into the highmem handler */
257         mfmsr   r7
258         ori     r7, r7, MSR_IR|MSR_DR|MSR_RI|MSR_ME     /* Enable paging */
259         mtsrr1  r7
260         /* Load highmem handler address */
261         PPC_LL  r8, (SHADOW_VCPU_OFF + SVCPU_VMHANDLER)(r13)
262         mtsrr0  r8
264         RFI
265 kvmppc_handler_trampoline_exit_end: