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.
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.
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.
15 * Copyright IBM Corp. 2007
16 * Copyright 2011 Freescale Semiconductor, Inc.
18 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
21 #include <asm/ppc_asm.h>
22 #include <asm/kvm_asm.h>
24 #include <asm/mmu-44x.h>
26 #include <asm/asm-offsets.h>
28 /* The host stack layout: */
29 #define HOST_R1 0 /* Implied by stwu. */
30 #define HOST_CALLEE_LR 4
32 /* r2 is special: it holds 'current', and it made nonvolatile in the
33 * kernel with the -ffixed-r2 gcc option. */
36 #define HOST_NV_GPRS 20
37 #define __HOST_NV_GPR(n) (HOST_NV_GPRS + ((n - 14) * 4))
38 #define HOST_NV_GPR(n) __HOST_NV_GPR(__REG_##n)
39 #define HOST_MIN_STACK_SIZE (HOST_NV_GPR(R31) + 4)
40 #define HOST_STACK_SIZE (((HOST_MIN_STACK_SIZE + 15) / 16) * 16) /* Align. */
41 #define HOST_STACK_LR (HOST_STACK_SIZE + 4) /* In caller stack frame. */
43 #define NEED_INST_MASK ((1<<BOOKE_INTERRUPT_PROGRAM) | \
44 (1<<BOOKE_INTERRUPT_DTLB_MISS) | \
45 (1<<BOOKE_INTERRUPT_DEBUG))
47 #define NEED_DEAR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \
48 (1<<BOOKE_INTERRUPT_DTLB_MISS))
50 #define NEED_ESR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \
51 (1<<BOOKE_INTERRUPT_INST_STORAGE) | \
52 (1<<BOOKE_INTERRUPT_PROGRAM) | \
53 (1<<BOOKE_INTERRUPT_DTLB_MISS))
55 .macro KVM_HANDLER ivor_nr scratch srr0
56 _GLOBAL(kvmppc_handler_\ivor_nr)
57 /* Get pointer to vcpu and record exit number. */
59 mfspr r4, SPRN_SPRG_RVCPU
60 stw r3, VCPU_GPR(R3)(r4)
61 stw r5, VCPU_GPR(R5)(r4)
62 stw r6, VCPU_GPR(R6)(r4)
65 stw r3, VCPU_GPR(R4)(r4)
68 lis r6, kvmppc_resume_host@h
71 ori r6, r6, kvmppc_resume_host@l
76 _GLOBAL(kvmppc_handlers_start)
77 KVM_HANDLER BOOKE_INTERRUPT_CRITICAL SPRN_SPRG_RSCRATCH_CRIT SPRN_CSRR0
78 KVM_HANDLER BOOKE_INTERRUPT_MACHINE_CHECK SPRN_SPRG_RSCRATCH_MC SPRN_MCSRR0
79 KVM_HANDLER BOOKE_INTERRUPT_DATA_STORAGE SPRN_SPRG_RSCRATCH0 SPRN_SRR0
80 KVM_HANDLER BOOKE_INTERRUPT_INST_STORAGE SPRN_SPRG_RSCRATCH0 SPRN_SRR0
81 KVM_HANDLER BOOKE_INTERRUPT_EXTERNAL SPRN_SPRG_RSCRATCH0 SPRN_SRR0
82 KVM_HANDLER BOOKE_INTERRUPT_ALIGNMENT SPRN_SPRG_RSCRATCH0 SPRN_SRR0
83 KVM_HANDLER BOOKE_INTERRUPT_PROGRAM SPRN_SPRG_RSCRATCH0 SPRN_SRR0
84 KVM_HANDLER BOOKE_INTERRUPT_FP_UNAVAIL SPRN_SPRG_RSCRATCH0 SPRN_SRR0
85 KVM_HANDLER BOOKE_INTERRUPT_SYSCALL SPRN_SPRG_RSCRATCH0 SPRN_SRR0
86 KVM_HANDLER BOOKE_INTERRUPT_AP_UNAVAIL SPRN_SPRG_RSCRATCH0 SPRN_SRR0
87 KVM_HANDLER BOOKE_INTERRUPT_DECREMENTER SPRN_SPRG_RSCRATCH0 SPRN_SRR0
88 KVM_HANDLER BOOKE_INTERRUPT_FIT SPRN_SPRG_RSCRATCH0 SPRN_SRR0
89 KVM_HANDLER BOOKE_INTERRUPT_WATCHDOG SPRN_SPRG_RSCRATCH_CRIT SPRN_CSRR0
90 KVM_HANDLER BOOKE_INTERRUPT_DTLB_MISS SPRN_SPRG_RSCRATCH0 SPRN_SRR0
91 KVM_HANDLER BOOKE_INTERRUPT_ITLB_MISS SPRN_SPRG_RSCRATCH0 SPRN_SRR0
92 KVM_HANDLER BOOKE_INTERRUPT_DEBUG SPRN_SPRG_RSCRATCH_CRIT SPRN_CSRR0
93 KVM_HANDLER BOOKE_INTERRUPT_SPE_UNAVAIL SPRN_SPRG_RSCRATCH0 SPRN_SRR0
94 KVM_HANDLER BOOKE_INTERRUPT_SPE_FP_DATA SPRN_SPRG_RSCRATCH0 SPRN_SRR0
95 KVM_HANDLER BOOKE_INTERRUPT_SPE_FP_ROUND SPRN_SPRG_RSCRATCH0 SPRN_SRR0
97 _GLOBAL(kvmppc_handler_len)
98 .long kvmppc_handler_1 - kvmppc_handler_0
101 * SPRG_SCRATCH0: guest r4
103 * r5: KVM exit number
105 _GLOBAL(kvmppc_resume_host)
108 stw r7, VCPU_GPR(R7)(r4)
109 stw r8, VCPU_GPR(R8)(r4)
110 stw r9, VCPU_GPR(R9)(r4)
115 #ifdef CONFIG_KVM_EXIT_TIMING
123 stw r8, VCPU_TIMING_EXIT_TBL(r4)
124 stw r9, VCPU_TIMING_EXIT_TBU(r4)
127 /* Save the faulting instruction and all GPRs for emulation. */
128 andi. r7, r6, NEED_INST_MASK
138 stw r9, VCPU_LAST_INST(r4)
140 stw r15, VCPU_GPR(R15)(r4)
141 stw r16, VCPU_GPR(R16)(r4)
142 stw r17, VCPU_GPR(R17)(r4)
143 stw r18, VCPU_GPR(R18)(r4)
144 stw r19, VCPU_GPR(R19)(r4)
145 stw r20, VCPU_GPR(R20)(r4)
146 stw r21, VCPU_GPR(R21)(r4)
147 stw r22, VCPU_GPR(R22)(r4)
148 stw r23, VCPU_GPR(R23)(r4)
149 stw r24, VCPU_GPR(R24)(r4)
150 stw r25, VCPU_GPR(R25)(r4)
151 stw r26, VCPU_GPR(R26)(r4)
152 stw r27, VCPU_GPR(R27)(r4)
153 stw r28, VCPU_GPR(R28)(r4)
154 stw r29, VCPU_GPR(R29)(r4)
155 stw r30, VCPU_GPR(R30)(r4)
156 stw r31, VCPU_GPR(R31)(r4)
159 /* Also grab DEAR and ESR before the host can clobber them. */
161 andi. r7, r6, NEED_DEAR_MASK
164 stw r9, VCPU_FAULT_DEAR(r4)
167 andi. r7, r6, NEED_ESR_MASK
170 stw r9, VCPU_FAULT_ESR(r4)
173 /* Save remaining volatile guest register state to vcpu. */
174 stw r0, VCPU_GPR(R0)(r4)
175 stw r1, VCPU_GPR(R1)(r4)
176 stw r2, VCPU_GPR(R2)(r4)
177 stw r10, VCPU_GPR(R10)(r4)
178 stw r11, VCPU_GPR(R11)(r4)
179 stw r12, VCPU_GPR(R12)(r4)
180 stw r13, VCPU_GPR(R13)(r4)
181 stw r14, VCPU_GPR(R14)(r4) /* We need a NV GPR below. */
187 /* Restore host stack pointer and PID before IVPR, since the host
188 * exception handlers use them. */
189 lwz r1, VCPU_HOST_STACK(r4)
190 lwz r3, VCPU_HOST_PID(r4)
193 #ifdef CONFIG_FSL_BOOKE
194 /* we cheat and know that Linux doesn't use PID1 which is always 0 */
199 /* Restore host IVPR before re-enabling interrupts. We cheat and know
200 * that Linux IVPR is always 0xc0000000. */
204 /* Switch to kernel stack and jump to handler. */
205 LOAD_REG_ADDR(r3, kvmppc_handle_exit)
209 mr r14, r4 /* Save vcpu pointer. */
211 bctrl /* kvmppc_handle_exit() */
213 /* Restore vcpu pointer and the nonvolatiles we used. */
215 lwz r14, VCPU_GPR(R14)(r4)
217 /* Sometimes instruction emulation must restore complete GPR state. */
218 andi. r5, r3, RESUME_FLAG_NV
220 lwz r15, VCPU_GPR(R15)(r4)
221 lwz r16, VCPU_GPR(R16)(r4)
222 lwz r17, VCPU_GPR(R17)(r4)
223 lwz r18, VCPU_GPR(R18)(r4)
224 lwz r19, VCPU_GPR(R19)(r4)
225 lwz r20, VCPU_GPR(R20)(r4)
226 lwz r21, VCPU_GPR(R21)(r4)
227 lwz r22, VCPU_GPR(R22)(r4)
228 lwz r23, VCPU_GPR(R23)(r4)
229 lwz r24, VCPU_GPR(R24)(r4)
230 lwz r25, VCPU_GPR(R25)(r4)
231 lwz r26, VCPU_GPR(R26)(r4)
232 lwz r27, VCPU_GPR(R27)(r4)
233 lwz r28, VCPU_GPR(R28)(r4)
234 lwz r29, VCPU_GPR(R29)(r4)
235 lwz r30, VCPU_GPR(R30)(r4)
236 lwz r31, VCPU_GPR(R31)(r4)
239 /* Should we return to the guest? */
240 andi. r5, r3, RESUME_FLAG_HOST
243 srawi r3, r3, 2 /* Shift -ERR back down. */
246 /* Not returning to guest. */
249 /* save guest SPEFSCR and load host SPEFSCR */
250 mfspr r9, SPRN_SPEFSCR
251 stw r9, VCPU_SPEFSCR(r4)
252 lwz r9, VCPU_HOST_SPEFSCR(r4)
253 mtspr SPRN_SPEFSCR, r9
256 /* We already saved guest volatile register state; now save the
258 stw r15, VCPU_GPR(R15)(r4)
259 stw r16, VCPU_GPR(R16)(r4)
260 stw r17, VCPU_GPR(R17)(r4)
261 stw r18, VCPU_GPR(R18)(r4)
262 stw r19, VCPU_GPR(R19)(r4)
263 stw r20, VCPU_GPR(R20)(r4)
264 stw r21, VCPU_GPR(R21)(r4)
265 stw r22, VCPU_GPR(R22)(r4)
266 stw r23, VCPU_GPR(R23)(r4)
267 stw r24, VCPU_GPR(R24)(r4)
268 stw r25, VCPU_GPR(R25)(r4)
269 stw r26, VCPU_GPR(R26)(r4)
270 stw r27, VCPU_GPR(R27)(r4)
271 stw r28, VCPU_GPR(R28)(r4)
272 stw r29, VCPU_GPR(R29)(r4)
273 stw r30, VCPU_GPR(R30)(r4)
274 stw r31, VCPU_GPR(R31)(r4)
276 /* Load host non-volatile register state from host stack. */
277 lwz r14, HOST_NV_GPR(R14)(r1)
278 lwz r15, HOST_NV_GPR(R15)(r1)
279 lwz r16, HOST_NV_GPR(R16)(r1)
280 lwz r17, HOST_NV_GPR(R17)(r1)
281 lwz r18, HOST_NV_GPR(R18)(r1)
282 lwz r19, HOST_NV_GPR(R19)(r1)
283 lwz r20, HOST_NV_GPR(R20)(r1)
284 lwz r21, HOST_NV_GPR(R21)(r1)
285 lwz r22, HOST_NV_GPR(R22)(r1)
286 lwz r23, HOST_NV_GPR(R23)(r1)
287 lwz r24, HOST_NV_GPR(R24)(r1)
288 lwz r25, HOST_NV_GPR(R25)(r1)
289 lwz r26, HOST_NV_GPR(R26)(r1)
290 lwz r27, HOST_NV_GPR(R27)(r1)
291 lwz r28, HOST_NV_GPR(R28)(r1)
292 lwz r29, HOST_NV_GPR(R29)(r1)
293 lwz r30, HOST_NV_GPR(R30)(r1)
294 lwz r31, HOST_NV_GPR(R31)(r1)
296 /* Return to kvm_vcpu_run(). */
297 lwz r4, HOST_STACK_LR(r1)
299 addi r1, r1, HOST_STACK_SIZE
302 /* r3 still contains the return code from kvmppc_handle_exit(). */
307 * r3: kvm_run pointer
310 _GLOBAL(__kvmppc_vcpu_run)
311 stwu r1, -HOST_STACK_SIZE(r1)
312 stw r1, VCPU_HOST_STACK(r4) /* Save stack pointer to vcpu. */
314 /* Save host state to stack. */
317 stw r3, HOST_STACK_LR(r1)
321 /* Save host non-volatile register state to stack. */
322 stw r14, HOST_NV_GPR(R14)(r1)
323 stw r15, HOST_NV_GPR(R15)(r1)
324 stw r16, HOST_NV_GPR(R16)(r1)
325 stw r17, HOST_NV_GPR(R17)(r1)
326 stw r18, HOST_NV_GPR(R18)(r1)
327 stw r19, HOST_NV_GPR(R19)(r1)
328 stw r20, HOST_NV_GPR(R20)(r1)
329 stw r21, HOST_NV_GPR(R21)(r1)
330 stw r22, HOST_NV_GPR(R22)(r1)
331 stw r23, HOST_NV_GPR(R23)(r1)
332 stw r24, HOST_NV_GPR(R24)(r1)
333 stw r25, HOST_NV_GPR(R25)(r1)
334 stw r26, HOST_NV_GPR(R26)(r1)
335 stw r27, HOST_NV_GPR(R27)(r1)
336 stw r28, HOST_NV_GPR(R28)(r1)
337 stw r29, HOST_NV_GPR(R29)(r1)
338 stw r30, HOST_NV_GPR(R30)(r1)
339 stw r31, HOST_NV_GPR(R31)(r1)
341 /* Load guest non-volatiles. */
342 lwz r14, VCPU_GPR(R14)(r4)
343 lwz r15, VCPU_GPR(R15)(r4)
344 lwz r16, VCPU_GPR(R16)(r4)
345 lwz r17, VCPU_GPR(R17)(r4)
346 lwz r18, VCPU_GPR(R18)(r4)
347 lwz r19, VCPU_GPR(R19)(r4)
348 lwz r20, VCPU_GPR(R20)(r4)
349 lwz r21, VCPU_GPR(R21)(r4)
350 lwz r22, VCPU_GPR(R22)(r4)
351 lwz r23, VCPU_GPR(R23)(r4)
352 lwz r24, VCPU_GPR(R24)(r4)
353 lwz r25, VCPU_GPR(R25)(r4)
354 lwz r26, VCPU_GPR(R26)(r4)
355 lwz r27, VCPU_GPR(R27)(r4)
356 lwz r28, VCPU_GPR(R28)(r4)
357 lwz r29, VCPU_GPR(R29)(r4)
358 lwz r30, VCPU_GPR(R30)(r4)
359 lwz r31, VCPU_GPR(R31)(r4)
362 /* save host SPEFSCR and load guest SPEFSCR */
363 mfspr r3, SPRN_SPEFSCR
364 stw r3, VCPU_HOST_SPEFSCR(r4)
365 lwz r3, VCPU_SPEFSCR(r4)
366 mtspr SPRN_SPEFSCR, r3
373 stw r3, VCPU_HOST_PID(r4)
374 lwz r3, VCPU_SHADOW_PID(r4)
377 #ifdef CONFIG_FSL_BOOKE
378 lwz r3, VCPU_SHADOW_PID1(r4)
383 iccci 0, 0 /* XXX hack */
386 /* Load some guest volatiles. */
387 lwz r0, VCPU_GPR(R0)(r4)
388 lwz r2, VCPU_GPR(R2)(r4)
389 lwz r9, VCPU_GPR(R9)(r4)
390 lwz r10, VCPU_GPR(R10)(r4)
391 lwz r11, VCPU_GPR(R11)(r4)
392 lwz r12, VCPU_GPR(R12)(r4)
393 lwz r13, VCPU_GPR(R13)(r4)
399 /* Switch the IVPR. XXX If we take a TLB miss after this we're screwed,
400 * so how do we make sure vcpu won't fault? */
401 lis r8, kvmppc_booke_handlers@ha
402 lwz r8, kvmppc_booke_handlers@l(r8)
405 /* Save vcpu pointer for the exception handlers. */
406 mtspr SPRN_SPRG_WVCPU, r4
408 lwz r5, VCPU_SHARED(r4)
410 /* Can't switch the stack pointer until after IVPR is switched,
411 * because host interrupt handlers would get confused. */
412 lwz r1, VCPU_GPR(R1)(r4)
415 * Host interrupt handlers may have clobbered these
416 * guest-readable SPRGs, or the guest kernel may have
417 * written directly to the shared area, so we
418 * need to reload them here with the guest's values.
420 PPC_LD(r3, VCPU_SHARED_SPRG4, r5)
421 mtspr SPRN_SPRG4W, r3
422 PPC_LD(r3, VCPU_SHARED_SPRG5, r5)
423 mtspr SPRN_SPRG5W, r3
424 PPC_LD(r3, VCPU_SHARED_SPRG6, r5)
425 mtspr SPRN_SPRG6W, r3
426 PPC_LD(r3, VCPU_SHARED_SPRG7, r5)
427 mtspr SPRN_SPRG7W, r3
429 #ifdef CONFIG_KVM_EXIT_TIMING
430 /* save enter time */
437 stw r7, VCPU_TIMING_LAST_ENTER_TBL(r4)
438 stw r8, VCPU_TIMING_LAST_ENTER_TBU(r4)
441 /* Finish loading guest volatiles and jump to guest. */
445 lwz r7, VCPU_SHADOW_MSR(r4)
450 lwz r5, VCPU_GPR(R5)(r4)
451 lwz r6, VCPU_GPR(R6)(r4)
452 lwz r7, VCPU_GPR(R7)(r4)
453 lwz r8, VCPU_GPR(R8)(r4)
455 /* Clear any debug events which occurred since we disabled MSR[DE].
456 * XXX This gives us a 3-instruction window in which a breakpoint
457 * intended for guest context could fire in the host instead. */
462 lwz r3, VCPU_GPR(R3)(r4)
463 lwz r4, VCPU_GPR(R4)(r4)
467 _GLOBAL(kvmppc_save_guest_spe)
470 SAVE_32EVRS(0, r4, r3, VCPU_EVR)
471 evxor evr6, evr6, evr6
472 evmwumiaa evr6, evr6, evr6
474 evstddx evr6, r4, r3 /* save acc */
477 _GLOBAL(kvmppc_load_guest_spe)
482 evmra evr6,evr6 /* load acc */
483 REST_32EVRS(0, r4, r3, VCPU_EVR)