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>
25 #include <asm/asm-offsets.h>
27 /* The host stack layout: */
28 #define HOST_R1 0 /* Implied by stwu. */
29 #define HOST_CALLEE_LR 4
31 /* r2 is special: it holds 'current', and it made nonvolatile in the
32 * kernel with the -ffixed-r2 gcc option. */
35 #define HOST_NV_GPRS 20
36 #define __HOST_NV_GPR(n) (HOST_NV_GPRS + ((n - 14) * 4))
37 #define HOST_NV_GPR(n) __HOST_NV_GPR(__REG_##n)
38 #define HOST_MIN_STACK_SIZE (HOST_NV_GPR(R31) + 4)
39 #define HOST_STACK_SIZE (((HOST_MIN_STACK_SIZE + 15) / 16) * 16) /* Align. */
40 #define HOST_STACK_LR (HOST_STACK_SIZE + 4) /* In caller stack frame. */
42 #define NEED_INST_MASK ((1<<BOOKE_INTERRUPT_PROGRAM) | \
43 (1<<BOOKE_INTERRUPT_DTLB_MISS) | \
44 (1<<BOOKE_INTERRUPT_DEBUG))
46 #define NEED_DEAR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \
47 (1<<BOOKE_INTERRUPT_DTLB_MISS) | \
48 (1<<BOOKE_INTERRUPT_ALIGNMENT))
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) | \
54 (1<<BOOKE_INTERRUPT_ALIGNMENT))
56 .macro __KVM_HANDLER ivor_nr scratch srr0
57 /* Get pointer to vcpu and record exit number. */
59 mfspr r4, SPRN_SPRG_THREAD
60 lwz r4, THREAD_KVM_VCPU(r4)
61 stw r3, VCPU_GPR(R3)(r4)
62 stw r5, VCPU_GPR(R5)(r4)
63 stw r6, VCPU_GPR(R6)(r4)
66 stw r3, VCPU_GPR(R4)(r4)
69 lis r6, kvmppc_resume_host@h
72 ori r6, r6, kvmppc_resume_host@l
77 .macro KVM_HANDLER ivor_nr scratch srr0
78 _GLOBAL(kvmppc_handler_\ivor_nr)
79 __KVM_HANDLER \ivor_nr \scratch \srr0
82 .macro KVM_DBG_HANDLER ivor_nr scratch srr0
83 _GLOBAL(kvmppc_handler_\ivor_nr)
85 mfspr r4, SPRN_SPRG_THREAD
86 lwz r4, THREAD_KVM_VCPU(r4)
87 stw r3, VCPU_CRIT_SAVE(r4)
92 /* debug interrupt happened in enter/exit path */
94 rlwinm r4, r4, 0, ~MSR_DE
99 mfspr r4, SPRN_SPRG_THREAD
100 lwz r4, THREAD_KVM_VCPU(r4)
102 lwz r3, VCPU_CRIT_SAVE(r4)
105 1: /* debug interrupt happened in guest */
107 mfspr r4, SPRN_SPRG_THREAD
108 lwz r4, THREAD_KVM_VCPU(r4)
109 lwz r3, VCPU_CRIT_SAVE(r4)
111 __KVM_HANDLER \ivor_nr \scratch \srr0
114 .macro KVM_HANDLER_ADDR ivor_nr
115 .long kvmppc_handler_\ivor_nr
118 .macro KVM_HANDLER_END
119 .long kvmppc_handlers_end
122 _GLOBAL(kvmppc_handlers_start)
123 KVM_HANDLER BOOKE_INTERRUPT_CRITICAL SPRN_SPRG_RSCRATCH_CRIT SPRN_CSRR0
124 KVM_HANDLER BOOKE_INTERRUPT_MACHINE_CHECK SPRN_SPRG_RSCRATCH_MC SPRN_MCSRR0
125 KVM_HANDLER BOOKE_INTERRUPT_DATA_STORAGE SPRN_SPRG_RSCRATCH0 SPRN_SRR0
126 KVM_HANDLER BOOKE_INTERRUPT_INST_STORAGE SPRN_SPRG_RSCRATCH0 SPRN_SRR0
127 KVM_HANDLER BOOKE_INTERRUPT_EXTERNAL SPRN_SPRG_RSCRATCH0 SPRN_SRR0
128 KVM_HANDLER BOOKE_INTERRUPT_ALIGNMENT SPRN_SPRG_RSCRATCH0 SPRN_SRR0
129 KVM_HANDLER BOOKE_INTERRUPT_PROGRAM SPRN_SPRG_RSCRATCH0 SPRN_SRR0
130 KVM_HANDLER BOOKE_INTERRUPT_FP_UNAVAIL SPRN_SPRG_RSCRATCH0 SPRN_SRR0
131 KVM_HANDLER BOOKE_INTERRUPT_SYSCALL SPRN_SPRG_RSCRATCH0 SPRN_SRR0
132 KVM_HANDLER BOOKE_INTERRUPT_AP_UNAVAIL SPRN_SPRG_RSCRATCH0 SPRN_SRR0
133 KVM_HANDLER BOOKE_INTERRUPT_DECREMENTER SPRN_SPRG_RSCRATCH0 SPRN_SRR0
134 KVM_HANDLER BOOKE_INTERRUPT_FIT SPRN_SPRG_RSCRATCH0 SPRN_SRR0
135 KVM_HANDLER BOOKE_INTERRUPT_WATCHDOG SPRN_SPRG_RSCRATCH_CRIT SPRN_CSRR0
136 KVM_HANDLER BOOKE_INTERRUPT_DTLB_MISS SPRN_SPRG_RSCRATCH0 SPRN_SRR0
137 KVM_HANDLER BOOKE_INTERRUPT_ITLB_MISS SPRN_SPRG_RSCRATCH0 SPRN_SRR0
138 KVM_DBG_HANDLER BOOKE_INTERRUPT_DEBUG SPRN_SPRG_RSCRATCH_CRIT SPRN_CSRR0
139 KVM_HANDLER BOOKE_INTERRUPT_SPE_UNAVAIL SPRN_SPRG_RSCRATCH0 SPRN_SRR0
140 KVM_HANDLER BOOKE_INTERRUPT_SPE_FP_DATA SPRN_SPRG_RSCRATCH0 SPRN_SRR0
141 KVM_HANDLER BOOKE_INTERRUPT_SPE_FP_ROUND SPRN_SPRG_RSCRATCH0 SPRN_SRR0
142 _GLOBAL(kvmppc_handlers_end)
145 * SPRG_SCRATCH0: guest r4
147 * r5: KVM exit number
149 _GLOBAL(kvmppc_resume_host)
152 stw r7, VCPU_GPR(R7)(r4)
153 stw r8, VCPU_GPR(R8)(r4)
154 stw r9, VCPU_GPR(R9)(r4)
159 #ifdef CONFIG_KVM_EXIT_TIMING
167 stw r8, VCPU_TIMING_EXIT_TBL(r4)
168 stw r9, VCPU_TIMING_EXIT_TBU(r4)
171 /* Save the faulting instruction and all GPRs for emulation. */
172 andi. r7, r6, NEED_INST_MASK
182 stw r9, VCPU_LAST_INST(r4)
184 stw r15, VCPU_GPR(R15)(r4)
185 stw r16, VCPU_GPR(R16)(r4)
186 stw r17, VCPU_GPR(R17)(r4)
187 stw r18, VCPU_GPR(R18)(r4)
188 stw r19, VCPU_GPR(R19)(r4)
189 stw r20, VCPU_GPR(R20)(r4)
190 stw r21, VCPU_GPR(R21)(r4)
191 stw r22, VCPU_GPR(R22)(r4)
192 stw r23, VCPU_GPR(R23)(r4)
193 stw r24, VCPU_GPR(R24)(r4)
194 stw r25, VCPU_GPR(R25)(r4)
195 stw r26, VCPU_GPR(R26)(r4)
196 stw r27, VCPU_GPR(R27)(r4)
197 stw r28, VCPU_GPR(R28)(r4)
198 stw r29, VCPU_GPR(R29)(r4)
199 stw r30, VCPU_GPR(R30)(r4)
200 stw r31, VCPU_GPR(R31)(r4)
203 /* Also grab DEAR and ESR before the host can clobber them. */
205 andi. r7, r6, NEED_DEAR_MASK
208 stw r9, VCPU_FAULT_DEAR(r4)
211 andi. r7, r6, NEED_ESR_MASK
214 stw r9, VCPU_FAULT_ESR(r4)
217 /* Save remaining volatile guest register state to vcpu. */
218 stw r0, VCPU_GPR(R0)(r4)
219 stw r1, VCPU_GPR(R1)(r4)
220 stw r2, VCPU_GPR(R2)(r4)
221 stw r10, VCPU_GPR(R10)(r4)
222 stw r11, VCPU_GPR(R11)(r4)
223 stw r12, VCPU_GPR(R12)(r4)
224 stw r13, VCPU_GPR(R13)(r4)
225 stw r14, VCPU_GPR(R14)(r4) /* We need a NV GPR below. */
231 /* Restore host stack pointer and PID before IVPR, since the host
232 * exception handlers use them. */
233 lwz r1, VCPU_HOST_STACK(r4)
234 lwz r3, VCPU_HOST_PID(r4)
237 #ifdef CONFIG_FSL_BOOKE
238 /* we cheat and know that Linux doesn't use PID1 which is always 0 */
243 /* Restore host IVPR before re-enabling interrupts. We cheat and know
244 * that Linux IVPR is always 0xc0000000. */
248 /* Switch to kernel stack and jump to handler. */
249 LOAD_REG_ADDR(r3, kvmppc_handle_exit)
253 mr r14, r4 /* Save vcpu pointer. */
255 bctrl /* kvmppc_handle_exit() */
257 /* Restore vcpu pointer and the nonvolatiles we used. */
259 lwz r14, VCPU_GPR(R14)(r4)
261 /* Sometimes instruction emulation must restore complete GPR state. */
262 andi. r5, r3, RESUME_FLAG_NV
264 lwz r15, VCPU_GPR(R15)(r4)
265 lwz r16, VCPU_GPR(R16)(r4)
266 lwz r17, VCPU_GPR(R17)(r4)
267 lwz r18, VCPU_GPR(R18)(r4)
268 lwz r19, VCPU_GPR(R19)(r4)
269 lwz r20, VCPU_GPR(R20)(r4)
270 lwz r21, VCPU_GPR(R21)(r4)
271 lwz r22, VCPU_GPR(R22)(r4)
272 lwz r23, VCPU_GPR(R23)(r4)
273 lwz r24, VCPU_GPR(R24)(r4)
274 lwz r25, VCPU_GPR(R25)(r4)
275 lwz r26, VCPU_GPR(R26)(r4)
276 lwz r27, VCPU_GPR(R27)(r4)
277 lwz r28, VCPU_GPR(R28)(r4)
278 lwz r29, VCPU_GPR(R29)(r4)
279 lwz r30, VCPU_GPR(R30)(r4)
280 lwz r31, VCPU_GPR(R31)(r4)
283 /* Should we return to the guest? */
284 andi. r5, r3, RESUME_FLAG_HOST
287 srawi r3, r3, 2 /* Shift -ERR back down. */
290 /* Not returning to guest. */
293 /* save guest SPEFSCR and load host SPEFSCR */
294 mfspr r9, SPRN_SPEFSCR
295 stw r9, VCPU_SPEFSCR(r4)
296 lwz r9, VCPU_HOST_SPEFSCR(r4)
297 mtspr SPRN_SPEFSCR, r9
300 /* We already saved guest volatile register state; now save the
302 stw r15, VCPU_GPR(R15)(r4)
303 stw r16, VCPU_GPR(R16)(r4)
304 stw r17, VCPU_GPR(R17)(r4)
305 stw r18, VCPU_GPR(R18)(r4)
306 stw r19, VCPU_GPR(R19)(r4)
307 stw r20, VCPU_GPR(R20)(r4)
308 stw r21, VCPU_GPR(R21)(r4)
309 stw r22, VCPU_GPR(R22)(r4)
310 stw r23, VCPU_GPR(R23)(r4)
311 stw r24, VCPU_GPR(R24)(r4)
312 stw r25, VCPU_GPR(R25)(r4)
313 stw r26, VCPU_GPR(R26)(r4)
314 stw r27, VCPU_GPR(R27)(r4)
315 stw r28, VCPU_GPR(R28)(r4)
316 stw r29, VCPU_GPR(R29)(r4)
317 stw r30, VCPU_GPR(R30)(r4)
318 stw r31, VCPU_GPR(R31)(r4)
320 /* Load host non-volatile register state from host stack. */
321 lwz r14, HOST_NV_GPR(R14)(r1)
322 lwz r15, HOST_NV_GPR(R15)(r1)
323 lwz r16, HOST_NV_GPR(R16)(r1)
324 lwz r17, HOST_NV_GPR(R17)(r1)
325 lwz r18, HOST_NV_GPR(R18)(r1)
326 lwz r19, HOST_NV_GPR(R19)(r1)
327 lwz r20, HOST_NV_GPR(R20)(r1)
328 lwz r21, HOST_NV_GPR(R21)(r1)
329 lwz r22, HOST_NV_GPR(R22)(r1)
330 lwz r23, HOST_NV_GPR(R23)(r1)
331 lwz r24, HOST_NV_GPR(R24)(r1)
332 lwz r25, HOST_NV_GPR(R25)(r1)
333 lwz r26, HOST_NV_GPR(R26)(r1)
334 lwz r27, HOST_NV_GPR(R27)(r1)
335 lwz r28, HOST_NV_GPR(R28)(r1)
336 lwz r29, HOST_NV_GPR(R29)(r1)
337 lwz r30, HOST_NV_GPR(R30)(r1)
338 lwz r31, HOST_NV_GPR(R31)(r1)
340 /* Return to kvm_vcpu_run(). */
341 lwz r4, HOST_STACK_LR(r1)
343 addi r1, r1, HOST_STACK_SIZE
346 /* r3 still contains the return code from kvmppc_handle_exit(). */
351 * r3: kvm_run pointer
354 _GLOBAL(__kvmppc_vcpu_run)
355 stwu r1, -HOST_STACK_SIZE(r1)
356 stw r1, VCPU_HOST_STACK(r4) /* Save stack pointer to vcpu. */
358 /* Save host state to stack. */
361 stw r3, HOST_STACK_LR(r1)
365 /* Save host non-volatile register state to stack. */
366 stw r14, HOST_NV_GPR(R14)(r1)
367 stw r15, HOST_NV_GPR(R15)(r1)
368 stw r16, HOST_NV_GPR(R16)(r1)
369 stw r17, HOST_NV_GPR(R17)(r1)
370 stw r18, HOST_NV_GPR(R18)(r1)
371 stw r19, HOST_NV_GPR(R19)(r1)
372 stw r20, HOST_NV_GPR(R20)(r1)
373 stw r21, HOST_NV_GPR(R21)(r1)
374 stw r22, HOST_NV_GPR(R22)(r1)
375 stw r23, HOST_NV_GPR(R23)(r1)
376 stw r24, HOST_NV_GPR(R24)(r1)
377 stw r25, HOST_NV_GPR(R25)(r1)
378 stw r26, HOST_NV_GPR(R26)(r1)
379 stw r27, HOST_NV_GPR(R27)(r1)
380 stw r28, HOST_NV_GPR(R28)(r1)
381 stw r29, HOST_NV_GPR(R29)(r1)
382 stw r30, HOST_NV_GPR(R30)(r1)
383 stw r31, HOST_NV_GPR(R31)(r1)
385 /* Load guest non-volatiles. */
386 lwz r14, VCPU_GPR(R14)(r4)
387 lwz r15, VCPU_GPR(R15)(r4)
388 lwz r16, VCPU_GPR(R16)(r4)
389 lwz r17, VCPU_GPR(R17)(r4)
390 lwz r18, VCPU_GPR(R18)(r4)
391 lwz r19, VCPU_GPR(R19)(r4)
392 lwz r20, VCPU_GPR(R20)(r4)
393 lwz r21, VCPU_GPR(R21)(r4)
394 lwz r22, VCPU_GPR(R22)(r4)
395 lwz r23, VCPU_GPR(R23)(r4)
396 lwz r24, VCPU_GPR(R24)(r4)
397 lwz r25, VCPU_GPR(R25)(r4)
398 lwz r26, VCPU_GPR(R26)(r4)
399 lwz r27, VCPU_GPR(R27)(r4)
400 lwz r28, VCPU_GPR(R28)(r4)
401 lwz r29, VCPU_GPR(R29)(r4)
402 lwz r30, VCPU_GPR(R30)(r4)
403 lwz r31, VCPU_GPR(R31)(r4)
406 /* save host SPEFSCR and load guest SPEFSCR */
407 mfspr r3, SPRN_SPEFSCR
408 stw r3, VCPU_HOST_SPEFSCR(r4)
409 lwz r3, VCPU_SPEFSCR(r4)
410 mtspr SPRN_SPEFSCR, r3
417 stw r3, VCPU_HOST_PID(r4)
418 lwz r3, VCPU_SHADOW_PID(r4)
421 #ifdef CONFIG_FSL_BOOKE
422 lwz r3, VCPU_SHADOW_PID1(r4)
426 /* Load some guest volatiles. */
427 lwz r0, VCPU_GPR(R0)(r4)
428 lwz r2, VCPU_GPR(R2)(r4)
429 lwz r9, VCPU_GPR(R9)(r4)
430 lwz r10, VCPU_GPR(R10)(r4)
431 lwz r11, VCPU_GPR(R11)(r4)
432 lwz r12, VCPU_GPR(R12)(r4)
433 lwz r13, VCPU_GPR(R13)(r4)
439 /* Switch the IVPR. XXX If we take a TLB miss after this we're screwed,
440 * so how do we make sure vcpu won't fault? */
441 lis r8, kvmppc_booke_handlers@ha
442 lwz r8, kvmppc_booke_handlers@l(r8)
445 lwz r5, VCPU_SHARED(r4)
447 /* Can't switch the stack pointer until after IVPR is switched,
448 * because host interrupt handlers would get confused. */
449 lwz r1, VCPU_GPR(R1)(r4)
452 * Host interrupt handlers may have clobbered these
453 * guest-readable SPRGs, or the guest kernel may have
454 * written directly to the shared area, so we
455 * need to reload them here with the guest's values.
457 PPC_LD(r3, VCPU_SHARED_SPRG4, r5)
458 mtspr SPRN_SPRG4W, r3
459 PPC_LD(r3, VCPU_SHARED_SPRG5, r5)
460 mtspr SPRN_SPRG5W, r3
461 PPC_LD(r3, VCPU_SHARED_SPRG6, r5)
462 mtspr SPRN_SPRG6W, r3
463 PPC_LD(r3, VCPU_SHARED_SPRG7, r5)
464 mtspr SPRN_SPRG7W, r3
466 #ifdef CONFIG_KVM_EXIT_TIMING
467 /* save enter time */
474 stw r7, VCPU_TIMING_LAST_ENTER_TBL(r4)
475 stw r8, VCPU_TIMING_LAST_ENTER_TBU(r4)
478 /* Finish loading guest volatiles and jump to guest. */
482 lwz r7, VCPU_SHADOW_MSR(r4)
487 lwz r5, VCPU_GPR(R5)(r4)
488 lwz r6, VCPU_GPR(R6)(r4)
489 lwz r7, VCPU_GPR(R7)(r4)
490 lwz r8, VCPU_GPR(R8)(r4)
492 /* Clear any debug events which occurred since we disabled MSR[DE].
493 * XXX This gives us a 3-instruction window in which a breakpoint
494 * intended for guest context could fire in the host instead. */
499 lwz r3, VCPU_GPR(R3)(r4)
500 lwz r4, VCPU_GPR(R4)(r4)
505 .globl kvmppc_booke_handler_addr
506 kvmppc_booke_handler_addr:
507 KVM_HANDLER_ADDR BOOKE_INTERRUPT_CRITICAL
508 KVM_HANDLER_ADDR BOOKE_INTERRUPT_MACHINE_CHECK
509 KVM_HANDLER_ADDR BOOKE_INTERRUPT_DATA_STORAGE
510 KVM_HANDLER_ADDR BOOKE_INTERRUPT_INST_STORAGE
511 KVM_HANDLER_ADDR BOOKE_INTERRUPT_EXTERNAL
512 KVM_HANDLER_ADDR BOOKE_INTERRUPT_ALIGNMENT
513 KVM_HANDLER_ADDR BOOKE_INTERRUPT_PROGRAM
514 KVM_HANDLER_ADDR BOOKE_INTERRUPT_FP_UNAVAIL
515 KVM_HANDLER_ADDR BOOKE_INTERRUPT_SYSCALL
516 KVM_HANDLER_ADDR BOOKE_INTERRUPT_AP_UNAVAIL
517 KVM_HANDLER_ADDR BOOKE_INTERRUPT_DECREMENTER
518 KVM_HANDLER_ADDR BOOKE_INTERRUPT_FIT
519 KVM_HANDLER_ADDR BOOKE_INTERRUPT_WATCHDOG
520 KVM_HANDLER_ADDR BOOKE_INTERRUPT_DTLB_MISS
521 KVM_HANDLER_ADDR BOOKE_INTERRUPT_ITLB_MISS
522 KVM_HANDLER_ADDR BOOKE_INTERRUPT_DEBUG
523 KVM_HANDLER_ADDR BOOKE_INTERRUPT_SPE_UNAVAIL
524 KVM_HANDLER_ADDR BOOKE_INTERRUPT_SPE_FP_DATA
525 KVM_HANDLER_ADDR BOOKE_INTERRUPT_SPE_FP_ROUND
526 KVM_HANDLER_END /*Always keep this in end*/
529 _GLOBAL(kvmppc_save_guest_spe)
532 SAVE_32EVRS(0, r4, r3, VCPU_EVR)
533 evxor evr6, evr6, evr6
534 evmwumiaa evr6, evr6, evr6
536 evstddx evr6, r4, r3 /* save acc */
539 _GLOBAL(kvmppc_load_guest_spe)
544 evmra evr6,evr6 /* load acc */
545 REST_32EVRS(0, r4, r3, VCPU_EVR)