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 <linux/linkage.h>
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-offsets.h>
18#include <asm/exception-64s.h>
19#include <asm/ppc-opcode.h>
20#include <asm/asm-compat.h>
21#include <asm/feature-fixups.h>
22
23/*****************************************************************************
24 *                                                                           *
25 *     Guest entry / exit code that is in kernel module memory (vmalloc)     *
26 *                                                                           *
27 ****************************************************************************/
28
29/* Registers:
30 *  none
31 */
32_GLOBAL(__kvmppc_vcore_entry)
33
34	/* Write correct stack frame */
35	mflr	r0
36	std	r0,PPC_LR_STKOFF(r1)
37
38	/* Save host state to the stack */
39	stdu	r1, -SWITCH_FRAME_SIZE(r1)
40
41	/* Save non-volatile registers (r14 - r31) and CR */
42	SAVE_NVGPRS(r1)
43	mfcr	r3
44	std	r3, _CCR(r1)
45
46	/* Save host DSCR */
47	mfspr	r3, SPRN_DSCR
48	std	r3, HSTATE_DSCR(r13)
49
50BEGIN_FTR_SECTION
51	/* Save host DABR */
52	mfspr	r3, SPRN_DABR
53	std	r3, HSTATE_DABR(r13)
54END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
55
56	/* Save host PMU registers */
57	bl	kvmhv_save_host_pmu
58
59	/*
60	 * Put whatever is in the decrementer into the
61	 * hypervisor decrementer.
62	 * Because of a hardware deviation in P8,
63	 * we need to set LPCR[HDICE] before writing HDEC.
64	 */
65	ld	r5, HSTATE_KVM_VCORE(r13)
66	ld	r6, VCORE_KVM(r5)
67	ld	r9, KVM_HOST_LPCR(r6)
68	ori	r8, r9, LPCR_HDICE
69	mtspr	SPRN_LPCR, r8
70	isync
71	mfspr	r8,SPRN_DEC
72	mftb	r7
73	extsw	r8,r8
74	mtspr	SPRN_HDEC,r8
75	add	r8,r8,r7
76	std	r8,HSTATE_DECEXP(r13)
77
78	/* Jump to partition switch code */
79	bl	kvmppc_hv_entry_trampoline
80	nop
81
82/*
83 * We return here in virtual mode after the guest exits
84 * with something that we can't handle in real mode.
85 * Interrupts are still hard-disabled.
86 */
87
88	/*
89	 * Register usage at this point:
90	 *
91	 * R1       = host R1
92	 * R2       = host R2
93	 * R3       = trap number on this thread
94	 * R12      = exit handler id
95	 * R13      = PACA
96	 */
97
98	/* Restore non-volatile host registers (r14 - r31) and CR */
99	REST_NVGPRS(r1)
100	ld	r4, _CCR(r1)
101	mtcr	r4
102
103	addi    r1, r1, SWITCH_FRAME_SIZE
104	ld	r0, PPC_LR_STKOFF(r1)
105	mtlr	r0
106	blr
107
108/*
109 * void kvmhv_save_host_pmu(void)
110 */
111SYM_FUNC_START_LOCAL(kvmhv_save_host_pmu)
112BEGIN_FTR_SECTION
113	/* Work around P8 PMAE bug */
114	li	r3, -1
115	clrrdi	r3, r3, 10
116	mfspr	r8, SPRN_MMCR2
117	mtspr	SPRN_MMCR2, r3		/* freeze all counters using MMCR2 */
118	isync
119END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
120	li	r3, 1
121	sldi	r3, r3, 31		/* MMCR0_FC (freeze counters) bit */
122	mfspr	r7, SPRN_MMCR0		/* save MMCR0 */
123	mtspr	SPRN_MMCR0, r3		/* freeze all counters, disable interrupts */
124	mfspr	r6, SPRN_MMCRA
125	/* Clear MMCRA in order to disable SDAR updates */
126	li	r5, 0
127	mtspr	SPRN_MMCRA, r5
128	isync
129	lbz	r5, PACA_PMCINUSE(r13)	/* is the host using the PMU? */
130	cmpwi	r5, 0
131	beq	31f			/* skip if not */
132	mfspr	r5, SPRN_MMCR1
133	mfspr	r9, SPRN_SIAR
134	mfspr	r10, SPRN_SDAR
135	std	r7, HSTATE_MMCR0(r13)
136	std	r5, HSTATE_MMCR1(r13)
137	std	r6, HSTATE_MMCRA(r13)
138	std	r9, HSTATE_SIAR(r13)
139	std	r10, HSTATE_SDAR(r13)
140BEGIN_FTR_SECTION
141	mfspr	r9, SPRN_SIER
142	std	r8, HSTATE_MMCR2(r13)
143	std	r9, HSTATE_SIER(r13)
144END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
145	mfspr	r3, SPRN_PMC1
146	mfspr	r5, SPRN_PMC2
147	mfspr	r6, SPRN_PMC3
148	mfspr	r7, SPRN_PMC4
149	mfspr	r8, SPRN_PMC5
150	mfspr	r9, SPRN_PMC6
151	stw	r3, HSTATE_PMC1(r13)
152	stw	r5, HSTATE_PMC2(r13)
153	stw	r6, HSTATE_PMC3(r13)
154	stw	r7, HSTATE_PMC4(r13)
155	stw	r8, HSTATE_PMC5(r13)
156	stw	r9, HSTATE_PMC6(r13)
15731:	blr
158SYM_FUNC_END(kvmhv_save_host_pmu)
159