1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 *
4 * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
5 *
6 * Author: Varun Sethi <varun.sethi@freescale.com>
7 * Author: Scott Wood <scotwood@freescale.com>
8 * Author: Mihai Caraman <mihai.caraman@freescale.com>
9 *
10 * This file is derived from arch/powerpc/kvm/booke_interrupts.S
11 */
12
13#include <asm/ppc_asm.h>
14#include <asm/kvm_asm.h>
15#include <asm/reg.h>
16#include <asm/page.h>
17#include <asm/asm-compat.h>
18#include <asm/asm-offsets.h>
19#include <asm/bitsperlong.h>
20
21#ifdef CONFIG_64BIT
22#include <asm/exception-64e.h>
23#include <asm/hw_irq.h>
24#include <asm/irqflags.h>
25#else
26#include "../kernel/head_booke.h" /* for THREAD_NORMSAVE() */
27#endif
28
29#define LONGBYTES		(BITS_PER_LONG / 8)
30
31#define VCPU_GUEST_SPRG(n)	(VCPU_GUEST_SPRGS + (n * LONGBYTES))
32
33/* The host stack layout: */
34#define HOST_R1         0 /* Implied by stwu. */
35#define HOST_CALLEE_LR  PPC_LR_STKOFF
36#define HOST_RUN        (HOST_CALLEE_LR + LONGBYTES)
37/*
38 * r2 is special: it holds 'current', and it made nonvolatile in the
39 * kernel with the -ffixed-r2 gcc option.
40 */
41#define HOST_R2         (HOST_RUN + LONGBYTES)
42#define HOST_CR         (HOST_R2 + LONGBYTES)
43#define HOST_NV_GPRS    (HOST_CR + LONGBYTES)
44#define __HOST_NV_GPR(n)  (HOST_NV_GPRS + ((n - 14) * LONGBYTES))
45#define HOST_NV_GPR(n)  __HOST_NV_GPR(__REG_##n)
46#define HOST_MIN_STACK_SIZE (HOST_NV_GPR(R31) + LONGBYTES)
47#define HOST_STACK_SIZE ((HOST_MIN_STACK_SIZE + 15) & ~15) /* Align. */
48/* LR in caller stack frame. */
49#define HOST_STACK_LR	(HOST_STACK_SIZE + PPC_LR_STKOFF)
50
51#define NEED_EMU		0x00000001 /* emulation -- save nv regs */
52#define NEED_DEAR		0x00000002 /* save faulting DEAR */
53#define NEED_ESR		0x00000004 /* save faulting ESR */
54
55/*
56 * On entry:
57 * r4 = vcpu, r5 = srr0, r6 = srr1
58 * saved in vcpu: cr, ctr, r3-r13
59 */
60.macro kvm_handler_common intno, srr0, flags
61	/* Restore host stack pointer */
62	PPC_STL	r1, VCPU_GPR(R1)(r4)
63	PPC_STL	r2, VCPU_GPR(R2)(r4)
64	PPC_LL	r1, VCPU_HOST_STACK(r4)
65	PPC_LL	r2, HOST_R2(r1)
66
67START_BTB_FLUSH_SECTION
68	BTB_FLUSH(r10)
69END_BTB_FLUSH_SECTION
70
71	mfspr	r10, SPRN_PID
72	lwz	r8, VCPU_HOST_PID(r4)
73	PPC_LL	r11, VCPU_SHARED(r4)
74	PPC_STL	r14, VCPU_GPR(R14)(r4) /* We need a non-volatile GPR. */
75	li	r14, \intno
76
77	stw	r10, VCPU_GUEST_PID(r4)
78	mtspr	SPRN_PID, r8
79
80#ifdef CONFIG_KVM_EXIT_TIMING
81	/* save exit time */
821:	mfspr	r7, SPRN_TBRU
83	mfspr	r8, SPRN_TBRL
84	mfspr	r9, SPRN_TBRU
85	cmpw	r9, r7
86	stw	r8, VCPU_TIMING_EXIT_TBL(r4)
87	bne-	1b
88	stw	r9, VCPU_TIMING_EXIT_TBU(r4)
89#endif
90
91	oris	r8, r6, MSR_CE@h
92	PPC_STD(r6, VCPU_SHARED_MSR, r11)
93	ori	r8, r8, MSR_ME | MSR_RI
94	PPC_STL	r5, VCPU_PC(r4)
95
96	/*
97	 * Make sure CE/ME/RI are set (if appropriate for exception type)
98	 * whether or not the guest had it set.  Since mfmsr/mtmsr are
99	 * somewhat expensive, skip in the common case where the guest
100	 * had all these bits set (and thus they're still set if
101	 * appropriate for the exception type).
102	 */
103	cmpw	r6, r8
104	beq	1f
105	mfmsr	r7
106	.if	\srr0 != SPRN_MCSRR0 && \srr0 != SPRN_CSRR0
107	oris	r7, r7, MSR_CE@h
108	.endif
109	.if	\srr0 != SPRN_MCSRR0
110	ori	r7, r7, MSR_ME | MSR_RI
111	.endif
112	mtmsr	r7
1131:
114
115	.if	\flags & NEED_EMU
116	PPC_STL	r15, VCPU_GPR(R15)(r4)
117	PPC_STL	r16, VCPU_GPR(R16)(r4)
118	PPC_STL	r17, VCPU_GPR(R17)(r4)
119	PPC_STL	r18, VCPU_GPR(R18)(r4)
120	PPC_STL	r19, VCPU_GPR(R19)(r4)
121	PPC_STL	r20, VCPU_GPR(R20)(r4)
122	PPC_STL	r21, VCPU_GPR(R21)(r4)
123	PPC_STL	r22, VCPU_GPR(R22)(r4)
124	PPC_STL	r23, VCPU_GPR(R23)(r4)
125	PPC_STL	r24, VCPU_GPR(R24)(r4)
126	PPC_STL	r25, VCPU_GPR(R25)(r4)
127	PPC_STL	r26, VCPU_GPR(R26)(r4)
128	PPC_STL	r27, VCPU_GPR(R27)(r4)
129	PPC_STL	r28, VCPU_GPR(R28)(r4)
130	PPC_STL	r29, VCPU_GPR(R29)(r4)
131	PPC_STL	r30, VCPU_GPR(R30)(r4)
132	PPC_STL	r31, VCPU_GPR(R31)(r4)
133
134	/*
135	 * We don't use external PID support. lwepx faults would need to be
136	 * handled by KVM and this implies aditional code in DO_KVM (for
137	 * DTB_MISS, DSI and LRAT) to check ESR[EPID] and EPLC[EGS] which
138	 * is too intrusive for the host. Get last instuction in
139	 * kvmppc_get_last_inst().
140	 */
141	li	r9, KVM_INST_FETCH_FAILED
142	stw	r9, VCPU_LAST_INST(r4)
143	.endif
144
145	.if	\flags & NEED_ESR
146	mfspr	r8, SPRN_ESR
147	PPC_STL	r8, VCPU_FAULT_ESR(r4)
148	.endif
149
150	.if	\flags & NEED_DEAR
151	mfspr	r9, SPRN_DEAR
152	PPC_STL	r9, VCPU_FAULT_DEAR(r4)
153	.endif
154
155	b	kvmppc_resume_host
156.endm
157
158#ifdef CONFIG_64BIT
159/* Exception types */
160#define EX_GEN			1
161#define EX_GDBELL		2
162#define EX_DBG			3
163#define EX_MC			4
164#define EX_CRIT			5
165#define EX_TLB			6
166
167/*
168 * For input register values, see arch/powerpc/include/asm/kvm_booke_hv_asm.h
169 */
170.macro kvm_handler intno type scratch, paca_ex, ex_r10, ex_r11, srr0, srr1, flags
171 _GLOBAL(kvmppc_handler_\intno\()_\srr1)
172	mr	r11, r4
173	/*
174	 * Get vcpu from Paca: paca->__current.thread->kvm_vcpu
175	 */
176	PPC_LL	r4, PACACURRENT(r13)
177	PPC_LL	r4, (THREAD + THREAD_KVM_VCPU)(r4)
178	PPC_STL	r10, VCPU_CR(r4)
179	PPC_STL r11, VCPU_GPR(R4)(r4)
180	PPC_STL	r5, VCPU_GPR(R5)(r4)
181	PPC_STL	r6, VCPU_GPR(R6)(r4)
182	PPC_STL	r8, VCPU_GPR(R8)(r4)
183	PPC_STL	r9, VCPU_GPR(R9)(r4)
184	.if \type == EX_TLB
185	PPC_LL	r5, EX_TLB_R13(r12)
186	PPC_LL	r6, EX_TLB_R10(r12)
187	PPC_LL	r8, EX_TLB_R11(r12)
188	mfspr	r12, \scratch
189	.else
190	mfspr	r5, \scratch
191	PPC_LL	r6, (\paca_ex + \ex_r10)(r13)
192	PPC_LL	r8, (\paca_ex + \ex_r11)(r13)
193	.endif
194	PPC_STL r5, VCPU_GPR(R13)(r4)
195	PPC_STL r3, VCPU_GPR(R3)(r4)
196	PPC_STL r7, VCPU_GPR(R7)(r4)
197	PPC_STL r12, VCPU_GPR(R12)(r4)
198	PPC_STL r6, VCPU_GPR(R10)(r4)
199	PPC_STL r8, VCPU_GPR(R11)(r4)
200	mfctr	r5
201	PPC_STL	r5, VCPU_CTR(r4)
202	mfspr	r5, \srr0
203	mfspr	r6, \srr1
204	kvm_handler_common \intno, \srr0, \flags
205.endm
206
207#define EX_PARAMS(type) \
208	EX_##type, \
209	SPRN_SPRG_##type##_SCRATCH, \
210	PACA_EX##type, \
211	EX_R10, \
212	EX_R11
213
214#define EX_PARAMS_TLB \
215	EX_TLB, \
216	SPRN_SPRG_GEN_SCRATCH, \
217	PACA_EXTLB, \
218	EX_TLB_R10, \
219	EX_TLB_R11
220
221kvm_handler BOOKE_INTERRUPT_CRITICAL, EX_PARAMS(CRIT), \
222	SPRN_CSRR0, SPRN_CSRR1, 0
223kvm_handler BOOKE_INTERRUPT_MACHINE_CHECK, EX_PARAMS(MC), \
224	SPRN_MCSRR0, SPRN_MCSRR1, 0
225kvm_handler BOOKE_INTERRUPT_DATA_STORAGE, EX_PARAMS(GEN), \
226	SPRN_SRR0, SPRN_SRR1,(NEED_EMU | NEED_DEAR | NEED_ESR)
227kvm_handler BOOKE_INTERRUPT_INST_STORAGE, EX_PARAMS(GEN), \
228	SPRN_SRR0, SPRN_SRR1, NEED_ESR
229kvm_handler BOOKE_INTERRUPT_EXTERNAL, EX_PARAMS(GEN), \
230	SPRN_SRR0, SPRN_SRR1, 0
231kvm_handler BOOKE_INTERRUPT_ALIGNMENT, EX_PARAMS(GEN), \
232	SPRN_SRR0, SPRN_SRR1,(NEED_DEAR | NEED_ESR)
233kvm_handler BOOKE_INTERRUPT_PROGRAM, EX_PARAMS(GEN), \
234	SPRN_SRR0, SPRN_SRR1, (NEED_ESR | NEED_EMU)
235kvm_handler BOOKE_INTERRUPT_FP_UNAVAIL, EX_PARAMS(GEN), \
236	SPRN_SRR0, SPRN_SRR1, 0
237kvm_handler BOOKE_INTERRUPT_AP_UNAVAIL, EX_PARAMS(GEN), \
238	SPRN_SRR0, SPRN_SRR1, 0
239kvm_handler BOOKE_INTERRUPT_DECREMENTER, EX_PARAMS(GEN), \
240	SPRN_SRR0, SPRN_SRR1, 0
241kvm_handler BOOKE_INTERRUPT_FIT, EX_PARAMS(GEN), \
242	SPRN_SRR0, SPRN_SRR1, 0
243kvm_handler BOOKE_INTERRUPT_WATCHDOG, EX_PARAMS(CRIT),\
244	SPRN_CSRR0, SPRN_CSRR1, 0
245/*
246 * Only bolted TLB miss exception handlers are supported for now
247 */
248kvm_handler BOOKE_INTERRUPT_DTLB_MISS, EX_PARAMS_TLB, \
249	SPRN_SRR0, SPRN_SRR1, (NEED_EMU | NEED_DEAR | NEED_ESR)
250kvm_handler BOOKE_INTERRUPT_ITLB_MISS, EX_PARAMS_TLB, \
251	SPRN_SRR0, SPRN_SRR1, 0
252kvm_handler BOOKE_INTERRUPT_ALTIVEC_UNAVAIL, EX_PARAMS(GEN), \
253	SPRN_SRR0, SPRN_SRR1, 0
254kvm_handler BOOKE_INTERRUPT_ALTIVEC_ASSIST, EX_PARAMS(GEN), \
255	SPRN_SRR0, SPRN_SRR1, 0
256kvm_handler BOOKE_INTERRUPT_PERFORMANCE_MONITOR, EX_PARAMS(GEN), \
257	SPRN_SRR0, SPRN_SRR1, 0
258kvm_handler BOOKE_INTERRUPT_DOORBELL, EX_PARAMS(GEN), \
259	SPRN_SRR0, SPRN_SRR1, 0
260kvm_handler BOOKE_INTERRUPT_DOORBELL_CRITICAL, EX_PARAMS(CRIT), \
261	SPRN_CSRR0, SPRN_CSRR1, 0
262kvm_handler BOOKE_INTERRUPT_HV_PRIV, EX_PARAMS(GEN), \
263	SPRN_SRR0, SPRN_SRR1, NEED_EMU
264kvm_handler BOOKE_INTERRUPT_HV_SYSCALL, EX_PARAMS(GEN), \
265	SPRN_SRR0, SPRN_SRR1, 0
266kvm_handler BOOKE_INTERRUPT_GUEST_DBELL, EX_PARAMS(GDBELL), \
267	SPRN_GSRR0, SPRN_GSRR1, 0
268kvm_handler BOOKE_INTERRUPT_GUEST_DBELL_CRIT, EX_PARAMS(CRIT), \
269	SPRN_CSRR0, SPRN_CSRR1, 0
270kvm_handler BOOKE_INTERRUPT_DEBUG, EX_PARAMS(DBG), \
271	SPRN_DSRR0, SPRN_DSRR1, 0
272kvm_handler BOOKE_INTERRUPT_DEBUG, EX_PARAMS(CRIT), \
273	SPRN_CSRR0, SPRN_CSRR1, 0
274kvm_handler BOOKE_INTERRUPT_LRAT_ERROR, EX_PARAMS(GEN), \
275	SPRN_SRR0, SPRN_SRR1, (NEED_EMU | NEED_DEAR | NEED_ESR)
276#else
277/*
278 * For input register values, see arch/powerpc/include/asm/kvm_booke_hv_asm.h
279 */
280.macro kvm_handler intno srr0, srr1, flags
281_GLOBAL(kvmppc_handler_\intno\()_\srr1)
282	PPC_LL	r11, THREAD_KVM_VCPU(r10)
283	PPC_STL r3, VCPU_GPR(R3)(r11)
284	mfspr	r3, SPRN_SPRG_RSCRATCH0
285	PPC_STL	r4, VCPU_GPR(R4)(r11)
286	PPC_LL	r4, THREAD_NORMSAVE(0)(r10)
287	PPC_STL	r5, VCPU_GPR(R5)(r11)
288	PPC_STL	r13, VCPU_CR(r11)
289	mfspr	r5, \srr0
290	PPC_STL	r3, VCPU_GPR(R10)(r11)
291	PPC_LL	r3, THREAD_NORMSAVE(2)(r10)
292	PPC_STL	r6, VCPU_GPR(R6)(r11)
293	PPC_STL	r4, VCPU_GPR(R11)(r11)
294	mfspr	r6, \srr1
295	PPC_STL	r7, VCPU_GPR(R7)(r11)
296	PPC_STL	r8, VCPU_GPR(R8)(r11)
297	PPC_STL	r9, VCPU_GPR(R9)(r11)
298	PPC_STL r3, VCPU_GPR(R13)(r11)
299	mfctr	r7
300	PPC_STL	r12, VCPU_GPR(R12)(r11)
301	PPC_STL	r7, VCPU_CTR(r11)
302	mr	r4, r11
303	kvm_handler_common \intno, \srr0, \flags
304.endm
305
306.macro kvm_lvl_handler intno scratch srr0, srr1, flags
307_GLOBAL(kvmppc_handler_\intno\()_\srr1)
308	mfspr	r10, SPRN_SPRG_THREAD
309	PPC_LL	r11, THREAD_KVM_VCPU(r10)
310	PPC_STL r3, VCPU_GPR(R3)(r11)
311	mfspr	r3, \scratch
312	PPC_STL	r4, VCPU_GPR(R4)(r11)
313	PPC_LL	r4, GPR9(r8)
314	PPC_STL	r5, VCPU_GPR(R5)(r11)
315	PPC_STL	r9, VCPU_CR(r11)
316	mfspr	r5, \srr0
317	PPC_STL	r3, VCPU_GPR(R8)(r11)
318	PPC_LL	r3, GPR10(r8)
319	PPC_STL	r6, VCPU_GPR(R6)(r11)
320	PPC_STL	r4, VCPU_GPR(R9)(r11)
321	mfspr	r6, \srr1
322	PPC_LL	r4, GPR11(r8)
323	PPC_STL	r7, VCPU_GPR(R7)(r11)
324	PPC_STL r3, VCPU_GPR(R10)(r11)
325	mfctr	r7
326	PPC_STL	r12, VCPU_GPR(R12)(r11)
327	PPC_STL r13, VCPU_GPR(R13)(r11)
328	PPC_STL	r4, VCPU_GPR(R11)(r11)
329	PPC_STL	r7, VCPU_CTR(r11)
330	mr	r4, r11
331	kvm_handler_common \intno, \srr0, \flags
332.endm
333
334kvm_lvl_handler BOOKE_INTERRUPT_CRITICAL, \
335	SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, 0
336kvm_lvl_handler BOOKE_INTERRUPT_MACHINE_CHECK, \
337	SPRN_SPRG_RSCRATCH_MC, SPRN_MCSRR0, SPRN_MCSRR1, 0
338kvm_handler BOOKE_INTERRUPT_DATA_STORAGE, \
339	SPRN_SRR0, SPRN_SRR1, (NEED_EMU | NEED_DEAR | NEED_ESR)
340kvm_handler BOOKE_INTERRUPT_INST_STORAGE, SPRN_SRR0, SPRN_SRR1, NEED_ESR
341kvm_handler BOOKE_INTERRUPT_EXTERNAL, SPRN_SRR0, SPRN_SRR1, 0
342kvm_handler BOOKE_INTERRUPT_ALIGNMENT, \
343	SPRN_SRR0, SPRN_SRR1, (NEED_DEAR | NEED_ESR)
344kvm_handler BOOKE_INTERRUPT_PROGRAM, SPRN_SRR0, SPRN_SRR1, (NEED_ESR | NEED_EMU)
345kvm_handler BOOKE_INTERRUPT_FP_UNAVAIL, SPRN_SRR0, SPRN_SRR1, 0
346kvm_handler BOOKE_INTERRUPT_SYSCALL, SPRN_SRR0, SPRN_SRR1, 0
347kvm_handler BOOKE_INTERRUPT_AP_UNAVAIL, SPRN_SRR0, SPRN_SRR1, 0
348kvm_handler BOOKE_INTERRUPT_DECREMENTER, SPRN_SRR0, SPRN_SRR1, 0
349kvm_handler BOOKE_INTERRUPT_FIT, SPRN_SRR0, SPRN_SRR1, 0
350kvm_lvl_handler BOOKE_INTERRUPT_WATCHDOG, \
351	SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, 0
352kvm_handler BOOKE_INTERRUPT_DTLB_MISS, \
353	SPRN_SRR0, SPRN_SRR1, (NEED_EMU | NEED_DEAR | NEED_ESR)
354kvm_handler BOOKE_INTERRUPT_ITLB_MISS, SPRN_SRR0, SPRN_SRR1, 0
355kvm_handler BOOKE_INTERRUPT_PERFORMANCE_MONITOR, SPRN_SRR0, SPRN_SRR1, 0
356kvm_handler BOOKE_INTERRUPT_DOORBELL, SPRN_SRR0, SPRN_SRR1, 0
357kvm_lvl_handler BOOKE_INTERRUPT_DOORBELL_CRITICAL, \
358	SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, 0
359kvm_handler BOOKE_INTERRUPT_HV_PRIV, SPRN_SRR0, SPRN_SRR1, NEED_EMU
360kvm_handler BOOKE_INTERRUPT_HV_SYSCALL, SPRN_SRR0, SPRN_SRR1, 0
361kvm_handler BOOKE_INTERRUPT_GUEST_DBELL, SPRN_GSRR0, SPRN_GSRR1, 0
362kvm_lvl_handler BOOKE_INTERRUPT_GUEST_DBELL_CRIT, \
363	SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, 0
364kvm_lvl_handler BOOKE_INTERRUPT_DEBUG, \
365	SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, 0
366kvm_lvl_handler BOOKE_INTERRUPT_DEBUG, \
367	SPRN_SPRG_RSCRATCH_DBG, SPRN_DSRR0, SPRN_DSRR1, 0
368#endif
369
370/* Registers:
371 *  SPRG_SCRATCH0: guest r10
372 *  r4: vcpu pointer
373 *  r11: vcpu->arch.shared
374 *  r14: KVM exit number
375 */
376_GLOBAL(kvmppc_resume_host)
377	/* Save remaining volatile guest register state to vcpu. */
378	mfspr	r3, SPRN_VRSAVE
379	PPC_STL	r0, VCPU_GPR(R0)(r4)
380	mflr	r5
381	mfspr	r6, SPRN_SPRG4
382	PPC_STL	r5, VCPU_LR(r4)
383	mfspr	r7, SPRN_SPRG5
384	stw	r3, VCPU_VRSAVE(r4)
385#ifdef CONFIG_64BIT
386	PPC_LL	r3, PACA_SPRG_VDSO(r13)
387#endif
388	mfspr	r5, SPRN_SPRG9
389	PPC_STD(r6, VCPU_SHARED_SPRG4, r11)
390	mfspr	r8, SPRN_SPRG6
391	PPC_STD(r7, VCPU_SHARED_SPRG5, r11)
392	mfspr	r9, SPRN_SPRG7
393#ifdef CONFIG_64BIT
394	mtspr	SPRN_SPRG_VDSO_WRITE, r3
395#endif
396	PPC_STD(r5, VCPU_SPRG9, r4)
397	PPC_STD(r8, VCPU_SHARED_SPRG6, r11)
398	mfxer	r3
399	PPC_STD(r9, VCPU_SHARED_SPRG7, r11)
400
401	/* save guest MAS registers and restore host mas4 & mas6 */
402	mfspr	r5, SPRN_MAS0
403	PPC_STL	r3, VCPU_XER(r4)
404	mfspr	r6, SPRN_MAS1
405	stw	r5, VCPU_SHARED_MAS0(r11)
406	mfspr	r7, SPRN_MAS2
407	stw	r6, VCPU_SHARED_MAS1(r11)
408	PPC_STD(r7, VCPU_SHARED_MAS2, r11)
409	mfspr	r5, SPRN_MAS3
410	mfspr	r6, SPRN_MAS4
411	stw	r5, VCPU_SHARED_MAS7_3+4(r11)
412	mfspr	r7, SPRN_MAS6
413	stw	r6, VCPU_SHARED_MAS4(r11)
414	mfspr	r5, SPRN_MAS7
415	lwz	r6, VCPU_HOST_MAS4(r4)
416	stw	r7, VCPU_SHARED_MAS6(r11)
417	lwz	r8, VCPU_HOST_MAS6(r4)
418	mtspr	SPRN_MAS4, r6
419	stw	r5, VCPU_SHARED_MAS7_3+0(r11)
420	mtspr	SPRN_MAS6, r8
421	/* Enable MAS register updates via exception */
422	mfspr	r3, SPRN_EPCR
423	rlwinm	r3, r3, 0, ~SPRN_EPCR_DMIUH
424	mtspr	SPRN_EPCR, r3
425	isync
426
427	/* Switch to kernel stack and jump to handler. */
428	mr	r3, r4
429	mr	r5, r14 /* intno */
430	mr	r14, r4 /* Save vcpu pointer. */
431	mr	r4, r5
432	bl	kvmppc_handle_exit
433
434	/* Restore vcpu pointer and the nonvolatiles we used. */
435	mr	r4, r14
436	PPC_LL	r14, VCPU_GPR(R14)(r4)
437
438	andi.	r5, r3, RESUME_FLAG_NV
439	beq	skip_nv_load
440	PPC_LL	r15, VCPU_GPR(R15)(r4)
441	PPC_LL	r16, VCPU_GPR(R16)(r4)
442	PPC_LL	r17, VCPU_GPR(R17)(r4)
443	PPC_LL	r18, VCPU_GPR(R18)(r4)
444	PPC_LL	r19, VCPU_GPR(R19)(r4)
445	PPC_LL	r20, VCPU_GPR(R20)(r4)
446	PPC_LL	r21, VCPU_GPR(R21)(r4)
447	PPC_LL	r22, VCPU_GPR(R22)(r4)
448	PPC_LL	r23, VCPU_GPR(R23)(r4)
449	PPC_LL	r24, VCPU_GPR(R24)(r4)
450	PPC_LL	r25, VCPU_GPR(R25)(r4)
451	PPC_LL	r26, VCPU_GPR(R26)(r4)
452	PPC_LL	r27, VCPU_GPR(R27)(r4)
453	PPC_LL	r28, VCPU_GPR(R28)(r4)
454	PPC_LL	r29, VCPU_GPR(R29)(r4)
455	PPC_LL	r30, VCPU_GPR(R30)(r4)
456	PPC_LL	r31, VCPU_GPR(R31)(r4)
457skip_nv_load:
458	/* Should we return to the guest? */
459	andi.	r5, r3, RESUME_FLAG_HOST
460	beq	lightweight_exit
461
462	srawi	r3, r3, 2 /* Shift -ERR back down. */
463
464heavyweight_exit:
465	/* Not returning to guest. */
466	PPC_LL	r5, HOST_STACK_LR(r1)
467	lwz	r6, HOST_CR(r1)
468
469	/*
470	 * We already saved guest volatile register state; now save the
471	 * non-volatiles.
472	 */
473
474	PPC_STL	r15, VCPU_GPR(R15)(r4)
475	PPC_STL	r16, VCPU_GPR(R16)(r4)
476	PPC_STL	r17, VCPU_GPR(R17)(r4)
477	PPC_STL	r18, VCPU_GPR(R18)(r4)
478	PPC_STL	r19, VCPU_GPR(R19)(r4)
479	PPC_STL	r20, VCPU_GPR(R20)(r4)
480	PPC_STL	r21, VCPU_GPR(R21)(r4)
481	PPC_STL	r22, VCPU_GPR(R22)(r4)
482	PPC_STL	r23, VCPU_GPR(R23)(r4)
483	PPC_STL	r24, VCPU_GPR(R24)(r4)
484	PPC_STL	r25, VCPU_GPR(R25)(r4)
485	PPC_STL	r26, VCPU_GPR(R26)(r4)
486	PPC_STL	r27, VCPU_GPR(R27)(r4)
487	PPC_STL	r28, VCPU_GPR(R28)(r4)
488	PPC_STL	r29, VCPU_GPR(R29)(r4)
489	PPC_STL	r30, VCPU_GPR(R30)(r4)
490	PPC_STL	r31, VCPU_GPR(R31)(r4)
491
492	/* Load host non-volatile register state from host stack. */
493	PPC_LL	r14, HOST_NV_GPR(R14)(r1)
494	PPC_LL	r15, HOST_NV_GPR(R15)(r1)
495	PPC_LL	r16, HOST_NV_GPR(R16)(r1)
496	PPC_LL	r17, HOST_NV_GPR(R17)(r1)
497	PPC_LL	r18, HOST_NV_GPR(R18)(r1)
498	PPC_LL	r19, HOST_NV_GPR(R19)(r1)
499	PPC_LL	r20, HOST_NV_GPR(R20)(r1)
500	PPC_LL	r21, HOST_NV_GPR(R21)(r1)
501	PPC_LL	r22, HOST_NV_GPR(R22)(r1)
502	PPC_LL	r23, HOST_NV_GPR(R23)(r1)
503	PPC_LL	r24, HOST_NV_GPR(R24)(r1)
504	PPC_LL	r25, HOST_NV_GPR(R25)(r1)
505	PPC_LL	r26, HOST_NV_GPR(R26)(r1)
506	PPC_LL	r27, HOST_NV_GPR(R27)(r1)
507	PPC_LL	r28, HOST_NV_GPR(R28)(r1)
508	PPC_LL	r29, HOST_NV_GPR(R29)(r1)
509	PPC_LL	r30, HOST_NV_GPR(R30)(r1)
510	PPC_LL	r31, HOST_NV_GPR(R31)(r1)
511
512	/* Return to kvm_vcpu_run(). */
513	mtlr	r5
514	mtcr	r6
515	addi	r1, r1, HOST_STACK_SIZE
516	/* r3 still contains the return code from kvmppc_handle_exit(). */
517	blr
518
519/* Registers:
520 *  r3: vcpu pointer
521 */
522_GLOBAL(__kvmppc_vcpu_run)
523	stwu	r1, -HOST_STACK_SIZE(r1)
524	PPC_STL	r1, VCPU_HOST_STACK(r3)	/* Save stack pointer to vcpu. */
525
526	/* Save host state to stack. */
527	mr	r4, r3
528	mflr	r3
529	mfcr	r5
530	PPC_STL	r3, HOST_STACK_LR(r1)
531
532	stw	r5, HOST_CR(r1)
533
534	/* Save host non-volatile register state to stack. */
535	PPC_STL	r14, HOST_NV_GPR(R14)(r1)
536	PPC_STL	r15, HOST_NV_GPR(R15)(r1)
537	PPC_STL	r16, HOST_NV_GPR(R16)(r1)
538	PPC_STL	r17, HOST_NV_GPR(R17)(r1)
539	PPC_STL	r18, HOST_NV_GPR(R18)(r1)
540	PPC_STL	r19, HOST_NV_GPR(R19)(r1)
541	PPC_STL	r20, HOST_NV_GPR(R20)(r1)
542	PPC_STL	r21, HOST_NV_GPR(R21)(r1)
543	PPC_STL	r22, HOST_NV_GPR(R22)(r1)
544	PPC_STL	r23, HOST_NV_GPR(R23)(r1)
545	PPC_STL	r24, HOST_NV_GPR(R24)(r1)
546	PPC_STL	r25, HOST_NV_GPR(R25)(r1)
547	PPC_STL	r26, HOST_NV_GPR(R26)(r1)
548	PPC_STL	r27, HOST_NV_GPR(R27)(r1)
549	PPC_STL	r28, HOST_NV_GPR(R28)(r1)
550	PPC_STL	r29, HOST_NV_GPR(R29)(r1)
551	PPC_STL	r30, HOST_NV_GPR(R30)(r1)
552	PPC_STL	r31, HOST_NV_GPR(R31)(r1)
553
554	/* Load guest non-volatiles. */
555	PPC_LL	r14, VCPU_GPR(R14)(r4)
556	PPC_LL	r15, VCPU_GPR(R15)(r4)
557	PPC_LL	r16, VCPU_GPR(R16)(r4)
558	PPC_LL	r17, VCPU_GPR(R17)(r4)
559	PPC_LL	r18, VCPU_GPR(R18)(r4)
560	PPC_LL	r19, VCPU_GPR(R19)(r4)
561	PPC_LL	r20, VCPU_GPR(R20)(r4)
562	PPC_LL	r21, VCPU_GPR(R21)(r4)
563	PPC_LL	r22, VCPU_GPR(R22)(r4)
564	PPC_LL	r23, VCPU_GPR(R23)(r4)
565	PPC_LL	r24, VCPU_GPR(R24)(r4)
566	PPC_LL	r25, VCPU_GPR(R25)(r4)
567	PPC_LL	r26, VCPU_GPR(R26)(r4)
568	PPC_LL	r27, VCPU_GPR(R27)(r4)
569	PPC_LL	r28, VCPU_GPR(R28)(r4)
570	PPC_LL	r29, VCPU_GPR(R29)(r4)
571	PPC_LL	r30, VCPU_GPR(R30)(r4)
572	PPC_LL	r31, VCPU_GPR(R31)(r4)
573
574
575lightweight_exit:
576	PPC_STL	r2, HOST_R2(r1)
577
578	mfspr	r3, SPRN_PID
579	stw	r3, VCPU_HOST_PID(r4)
580	lwz	r3, VCPU_GUEST_PID(r4)
581	mtspr	SPRN_PID, r3
582
583	PPC_LL	r11, VCPU_SHARED(r4)
584	/* Disable MAS register updates via exception */
585	mfspr	r3, SPRN_EPCR
586	oris	r3, r3, SPRN_EPCR_DMIUH@h
587	mtspr	SPRN_EPCR, r3
588	isync
589	/* Save host mas4 and mas6 and load guest MAS registers */
590	mfspr	r3, SPRN_MAS4
591	stw	r3, VCPU_HOST_MAS4(r4)
592	mfspr	r3, SPRN_MAS6
593	stw	r3, VCPU_HOST_MAS6(r4)
594	lwz	r3, VCPU_SHARED_MAS0(r11)
595	lwz	r5, VCPU_SHARED_MAS1(r11)
596	PPC_LD(r6, VCPU_SHARED_MAS2, r11)
597	lwz	r7, VCPU_SHARED_MAS7_3+4(r11)
598	lwz	r8, VCPU_SHARED_MAS4(r11)
599	mtspr	SPRN_MAS0, r3
600	mtspr	SPRN_MAS1, r5
601	mtspr	SPRN_MAS2, r6
602	mtspr	SPRN_MAS3, r7
603	mtspr	SPRN_MAS4, r8
604	lwz	r3, VCPU_SHARED_MAS6(r11)
605	lwz	r5, VCPU_SHARED_MAS7_3+0(r11)
606	mtspr	SPRN_MAS6, r3
607	mtspr	SPRN_MAS7, r5
608
609	/*
610	 * Host interrupt handlers may have clobbered these guest-readable
611	 * SPRGs, so we need to reload them here with the guest's values.
612	 */
613	lwz	r3, VCPU_VRSAVE(r4)
614	PPC_LD(r5, VCPU_SHARED_SPRG4, r11)
615	mtspr	SPRN_VRSAVE, r3
616	PPC_LD(r6, VCPU_SHARED_SPRG5, r11)
617	mtspr	SPRN_SPRG4W, r5
618	PPC_LD(r7, VCPU_SHARED_SPRG6, r11)
619	mtspr	SPRN_SPRG5W, r6
620	PPC_LD(r8, VCPU_SHARED_SPRG7, r11)
621	mtspr	SPRN_SPRG6W, r7
622	PPC_LD(r5, VCPU_SPRG9, r4)
623	mtspr	SPRN_SPRG7W, r8
624	mtspr	SPRN_SPRG9, r5
625
626	/* Load some guest volatiles. */
627	PPC_LL	r3, VCPU_LR(r4)
628	PPC_LL	r5, VCPU_XER(r4)
629	PPC_LL	r6, VCPU_CTR(r4)
630	PPC_LL	r7, VCPU_CR(r4)
631	PPC_LL	r8, VCPU_PC(r4)
632	PPC_LD(r9, VCPU_SHARED_MSR, r11)
633	PPC_LL	r0, VCPU_GPR(R0)(r4)
634	PPC_LL	r1, VCPU_GPR(R1)(r4)
635	PPC_LL	r2, VCPU_GPR(R2)(r4)
636	PPC_LL	r10, VCPU_GPR(R10)(r4)
637	PPC_LL	r11, VCPU_GPR(R11)(r4)
638	PPC_LL	r12, VCPU_GPR(R12)(r4)
639	PPC_LL	r13, VCPU_GPR(R13)(r4)
640	mtlr	r3
641	mtxer	r5
642	mtctr	r6
643	mtsrr0	r8
644	mtsrr1	r9
645
646#ifdef CONFIG_KVM_EXIT_TIMING
647	/* save enter time */
6481:
649	mfspr	r6, SPRN_TBRU
650	mfspr	r9, SPRN_TBRL
651	mfspr	r8, SPRN_TBRU
652	cmpw	r8, r6
653	stw	r9, VCPU_TIMING_LAST_ENTER_TBL(r4)
654	bne	1b
655	stw	r8, VCPU_TIMING_LAST_ENTER_TBU(r4)
656#endif
657
658	/*
659	 * Don't execute any instruction which can change CR after
660	 * below instruction.
661	 */
662	mtcr	r7
663
664	/* Finish loading guest volatiles and jump to guest. */
665	PPC_LL	r5, VCPU_GPR(R5)(r4)
666	PPC_LL	r6, VCPU_GPR(R6)(r4)
667	PPC_LL	r7, VCPU_GPR(R7)(r4)
668	PPC_LL	r8, VCPU_GPR(R8)(r4)
669	PPC_LL	r9, VCPU_GPR(R9)(r4)
670
671	PPC_LL	r3, VCPU_GPR(R3)(r4)
672	PPC_LL	r4, VCPU_GPR(R4)(r4)
673	rfi
674