1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 *
4 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
5 *
6 * Derived from book3s_interrupts.S, which is:
7 * Copyright SUSE Linux Products GmbH 2009
8 *
9 * Authors: Alexander Graf <agraf@suse.de>
10 */
11
12#include <asm/ppc_asm.h>
13#include <asm/kvm_asm.h>
14#include <asm/reg.h>
15#include <asm/page.h>
16#include <asm/asm-offsets.h>
17#include <asm/exception-64s.h>
18#include <asm/ppc-opcode.h>
19#include <asm/asm-compat.h>
20#include <asm/feature-fixups.h>
21
22/*****************************************************************************
23 *                                                                           *
24 *     Guest entry / exit code that is in kernel module memory (vmalloc)     *
25 *                                                                           *
26 ****************************************************************************/
27
28/* Registers:
29 *  none
30 */
31_GLOBAL(__kvmppc_vcore_entry)
32
33	/* Write correct stack frame */
34	mflr	r0
35	std	r0,PPC_LR_STKOFF(r1)
36
37	/* Save host state to the stack */
38	stdu	r1, -SWITCH_FRAME_SIZE(r1)
39
40	/* Save non-volatile registers (r14 - r31) and CR */
41	SAVE_NVGPRS(r1)
42	mfcr	r3
43	std	r3, _CCR(r1)
44
45	/* Save host DSCR */
46	mfspr	r3, SPRN_DSCR
47	std	r3, HSTATE_DSCR(r13)
48
49BEGIN_FTR_SECTION
50	/* Save host DABR */
51	mfspr	r3, SPRN_DABR
52	std	r3, HSTATE_DABR(r13)
53END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
54
55	/* Save host PMU registers */
56	bl	kvmhv_save_host_pmu
57
58	/*
59	 * Put whatever is in the decrementer into the
60	 * hypervisor decrementer.
61	 * Because of a hardware deviation in P8,
62	 * we need to set LPCR[HDICE] before writing HDEC.
63	 */
64	ld	r5, HSTATE_KVM_VCORE(r13)
65	ld	r6, VCORE_KVM(r5)
66	ld	r9, KVM_HOST_LPCR(r6)
67	ori	r8, r9, LPCR_HDICE
68	mtspr	SPRN_LPCR, r8
69	isync
70	mfspr	r8,SPRN_DEC
71	mftb	r7
72	extsw	r8,r8
73	mtspr	SPRN_HDEC,r8
74	add	r8,r8,r7
75	std	r8,HSTATE_DECEXP(r13)
76
77	/* Jump to partition switch code */
78	bl	kvmppc_hv_entry_trampoline
79	nop
80
81/*
82 * We return here in virtual mode after the guest exits
83 * with something that we can't handle in real mode.
84 * Interrupts are still hard-disabled.
85 */
86
87	/*
88	 * Register usage at this point:
89	 *
90	 * R1       = host R1
91	 * R2       = host R2
92	 * R3       = trap number on this thread
93	 * R12      = exit handler id
94	 * R13      = PACA
95	 */
96
97	/* Restore non-volatile host registers (r14 - r31) and CR */
98	REST_NVGPRS(r1)
99	ld	r4, _CCR(r1)
100	mtcr	r4
101
102	addi    r1, r1, SWITCH_FRAME_SIZE
103	ld	r0, PPC_LR_STKOFF(r1)
104	mtlr	r0
105	blr
106
107/*
108 * void kvmhv_save_host_pmu(void)
109 */
110kvmhv_save_host_pmu:
111BEGIN_FTR_SECTION
112	/* Work around P8 PMAE bug */
113	li	r3, -1
114	clrrdi	r3, r3, 10
115	mfspr	r8, SPRN_MMCR2
116	mtspr	SPRN_MMCR2, r3		/* freeze all counters using MMCR2 */
117	isync
118END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
119	li	r3, 1
120	sldi	r3, r3, 31		/* MMCR0_FC (freeze counters) bit */
121	mfspr	r7, SPRN_MMCR0		/* save MMCR0 */
122	mtspr	SPRN_MMCR0, r3		/* freeze all counters, disable interrupts */
123	mfspr	r6, SPRN_MMCRA
124	/* Clear MMCRA in order to disable SDAR updates */
125	li	r5, 0
126	mtspr	SPRN_MMCRA, r5
127	isync
128	lbz	r5, PACA_PMCINUSE(r13)	/* is the host using the PMU? */
129	cmpwi	r5, 0
130	beq	31f			/* skip if not */
131	mfspr	r5, SPRN_MMCR1
132	mfspr	r9, SPRN_SIAR
133	mfspr	r10, SPRN_SDAR
134	std	r7, HSTATE_MMCR0(r13)
135	std	r5, HSTATE_MMCR1(r13)
136	std	r6, HSTATE_MMCRA(r13)
137	std	r9, HSTATE_SIAR(r13)
138	std	r10, HSTATE_SDAR(r13)
139BEGIN_FTR_SECTION
140	mfspr	r9, SPRN_SIER
141	std	r8, HSTATE_MMCR2(r13)
142	std	r9, HSTATE_SIER(r13)
143END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
144	mfspr	r3, SPRN_PMC1
145	mfspr	r5, SPRN_PMC2
146	mfspr	r6, SPRN_PMC3
147	mfspr	r7, SPRN_PMC4
148	mfspr	r8, SPRN_PMC5
149	mfspr	r9, SPRN_PMC6
150	stw	r3, HSTATE_PMC1(r13)
151	stw	r5, HSTATE_PMC2(r13)
152	stw	r6, HSTATE_PMC3(r13)
153	stw	r7, HSTATE_PMC4(r13)
154	stw	r8, HSTATE_PMC5(r13)
155	stw	r9, HSTATE_PMC6(r13)
15631:	blr
157