summaryrefslogtreecommitdiff
path: root/arch/powerpc/kvm/book3s_64_slb.S
blob: 066c665dc86fbd81fa95f4c539e4904b673fc425 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright SUSE Linux Products GmbH 2009
 *
 * Authors: Alexander Graf <agraf@suse.de>
 */

#include <asm/asm-compat.h>
#include <asm/feature-fixups.h>

#define SHADOW_SLB_ENTRY_LEN	0x10
#define OFFSET_ESID(x)		(SHADOW_SLB_ENTRY_LEN * x)
#define OFFSET_VSID(x)		((SHADOW_SLB_ENTRY_LEN * x) + 8)

/******************************************************************************
 *                                                                            *
 *                               Entry code                                   *
 *                                                                            *
 *****************************************************************************/

.macro LOAD_GUEST_SEGMENTS

	/* Required state:
	 *
	 * MSR = ~IR|DR
	 * R13 = PACA
	 * R1 = host R1
	 * R2 = host R2
	 * R3 = shadow vcpu
	 * all other volatile GPRS = free except R4, R6
	 * SVCPU[CR]  = guest CR
	 * SVCPU[XER] = guest XER
	 * SVCPU[CTR] = guest CTR
	 * SVCPU[LR]  = guest LR
	 */

BEGIN_FW_FTR_SECTION

	/* Declare SLB shadow as 0 entries big */

	ld	r11, PACA_SLBSHADOWPTR(r13)
	li	r8, 0
	stb	r8, 3(r11)

END_FW_FTR_SECTION_IFSET(FW_FEATURE_LPAR)

	/* Flush SLB */

	li	r10, 0
	slbmte	r10, r10
	slbia

	/* Fill SLB with our shadow */

	lbz	r12, SVCPU_SLB_MAX(r3)
	mulli	r12, r12, 16
	addi	r12, r12, SVCPU_SLB
	add	r12, r12, r3

	/* for (r11 = kvm_slb; r11 < kvm_slb + kvm_slb_size; r11+=slb_entry) */
	li	r11, SVCPU_SLB
	add	r11, r11, r3

slb_loop_enter:

	ld	r10, 0(r11)

	andis.	r9, r10, SLB_ESID_V@h
	beq	slb_loop_enter_skip

	ld	r9, 8(r11)
	slbmte	r9, r10

slb_loop_enter_skip:
	addi	r11, r11, 16
	cmpd	cr0, r11, r12
	blt	slb_loop_enter

slb_do_enter:

.endm

/******************************************************************************
 *                                                                            *
 *                               Exit code                                    *
 *                                                                            *
 *****************************************************************************/

.macro LOAD_HOST_SEGMENTS

	/* Register usage at this point:
	 *
	 * R1         = host R1
	 * R2         = host R2
	 * R12        = exit handler id
	 * R13        = shadow vcpu - SHADOW_VCPU_OFF [=PACA on PPC64]
	 * SVCPU.*    = guest *
	 * SVCPU[CR]  = guest CR
	 * SVCPU[XER] = guest XER
	 * SVCPU[CTR] = guest CTR
	 * SVCPU[LR]  = guest LR
	 *
	 */

	/* Remove all SLB entries that are in use. */

	li	r0, 0
	slbmte	r0, r0
	slbia

	/* Restore bolted entries from the shadow */

	ld	r11, PACA_SLBSHADOWPTR(r13)

BEGIN_FW_FTR_SECTION

	/* Declare SLB shadow as SLB_NUM_BOLTED entries big */

	li	r8, SLB_NUM_BOLTED
	stb	r8, 3(r11)

END_FW_FTR_SECTION_IFSET(FW_FEATURE_LPAR)

	/* Manually load all entries from shadow SLB */

	li	r8, SLBSHADOW_SAVEAREA
	li	r7, SLBSHADOW_SAVEAREA + 8

	.rept	SLB_NUM_BOLTED
	LDX_BE	r10, r11, r8
	cmpdi	r10, 0
	beq	1f
	LDX_BE	r9, r11, r7
	slbmte	r9, r10
1:	addi	r7, r7, SHADOW_SLB_ENTRY_LEN
	addi	r8, r8, SHADOW_SLB_ENTRY_LEN
	.endr

	isync
	sync

slb_do_exit:

.endm