/arch/powerpc/kvm/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 <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	 */
 62BEGIN_FTR_SECTION
 63	ld	r5, HSTATE_KVM_VCORE(r13)
 64	ld	r6, VCORE_KVM(r5)
 65	ld	r9, KVM_HOST_LPCR(r6)
 66	andis.	r9, r9, LPCR_LD@h
 67END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
 68	mfspr	r8,SPRN_DEC
 69	mftb	r7
 70BEGIN_FTR_SECTION
 71	/* On POWER9, don't sign-extend if host LPCR[LD] bit is set */
 72	bne	32f
 73END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
 74	extsw	r8,r8
 7532:	mtspr	SPRN_HDEC,r8
 76	add	r8,r8,r7
 77	std	r8,HSTATE_DECEXP(r13)
 78
 79	/* Jump to partition switch code */
 80	bl	kvmppc_hv_entry_trampoline
 81	nop
 82
 83/*
 84 * We return here in virtual mode after the guest exits
 85 * with something that we can't handle in real mode.
 86 * Interrupts are still hard-disabled.
 87 */
 88
 89	/*
 90	 * Register usage at this point:
 91	 *
 92	 * R1       = host R1
 93	 * R2       = host R2
 94	 * R3       = trap number on this thread
 95	 * R12      = exit handler id
 96	 * R13      = PACA
 97	 */
 98
 99	/* Restore non-volatile host registers (r14 - r31) and CR */
100	REST_NVGPRS(r1)
101	ld	r4, _CCR(r1)
102	mtcr	r4
103
104	addi    r1, r1, SWITCH_FRAME_SIZE
105	ld	r0, PPC_LR_STKOFF(r1)
106	mtlr	r0
107	blr
108
109_GLOBAL(kvmhv_save_host_pmu)
110BEGIN_FTR_SECTION
111	/* Work around P8 PMAE bug */
112	li	r3, -1
113	clrrdi	r3, r3, 10
114	mfspr	r8, SPRN_MMCR2
115	mtspr	SPRN_MMCR2, r3		/* freeze all counters using MMCR2 */
116	isync
117END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
118	li	r3, 1
119	sldi	r3, r3, 31		/* MMCR0_FC (freeze counters) bit */
120	mfspr	r7, SPRN_MMCR0		/* save MMCR0 */
121	mtspr	SPRN_MMCR0, r3		/* freeze all counters, disable interrupts */
122	mfspr	r6, SPRN_MMCRA
123	/* Clear MMCRA in order to disable SDAR updates */
124	li	r5, 0
125	mtspr	SPRN_MMCRA, r5
126	isync
127	lbz	r5, PACA_PMCINUSE(r13)	/* is the host using the PMU? */
128	cmpwi	r5, 0
129	beq	31f			/* skip if not */
130	mfspr	r5, SPRN_MMCR1
131	mfspr	r9, SPRN_SIAR
132	mfspr	r10, SPRN_SDAR
133	std	r7, HSTATE_MMCR0(r13)
134	std	r5, HSTATE_MMCR1(r13)
135	std	r6, HSTATE_MMCRA(r13)
136	std	r9, HSTATE_SIAR(r13)
137	std	r10, HSTATE_SDAR(r13)
138BEGIN_FTR_SECTION
139	mfspr	r9, SPRN_SIER
140	std	r8, HSTATE_MMCR2(r13)
141	std	r9, HSTATE_SIER(r13)
142END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
143	mfspr	r3, SPRN_PMC1
144	mfspr	r5, SPRN_PMC2
145	mfspr	r6, SPRN_PMC3
146	mfspr	r7, SPRN_PMC4
147	mfspr	r8, SPRN_PMC5
148	mfspr	r9, SPRN_PMC6
149	stw	r3, HSTATE_PMC1(r13)
150	stw	r5, HSTATE_PMC2(r13)
151	stw	r6, HSTATE_PMC3(r13)
152	stw	r7, HSTATE_PMC4(r13)
153	stw	r8, HSTATE_PMC5(r13)
154	stw	r9, HSTATE_PMC6(r13)
15531:	blr