book3s_hv_interrupts.S

  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)