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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/kvm/book3s_32_sr.S
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/* SPDX-License-Identifier: GPL-2.0-only */

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/*

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 *

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 * Copyright SUSE Linux Products GmbH 2009

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 *

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 * Authors: Alexander Graf <[email protected]>

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 */

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/******************************************************************************

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 *                                                                            *

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 *                               Entry code                                   *

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 *                                                                            *

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 *****************************************************************************/

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.macro LOAD_GUEST_SEGMENTS

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	/* Required state:

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	 *

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	 * MSR = ~IR|DR

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	 * R1 = host R1

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	 * R2 = host R2

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	 * R3 = shadow vcpu

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	 * all other volatile GPRS = free except R4, R6

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	 * SVCPU[CR]  = guest CR

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	 * SVCPU[XER] = guest XER

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	 * SVCPU[CTR] = guest CTR

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	 * SVCPU[LR]  = guest LR

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	 */

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#define XCHG_SR(n)	lwz	r9, (SVCPU_SR+(n*4))(r3);  \

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			mtsr	n, r9

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	XCHG_SR(0)

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	XCHG_SR(1)

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	XCHG_SR(2)

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	XCHG_SR(3)

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	XCHG_SR(4)

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	XCHG_SR(5)

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	XCHG_SR(6)

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	XCHG_SR(7)

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	XCHG_SR(8)

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	XCHG_SR(9)

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	XCHG_SR(10)

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	XCHG_SR(11)

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	XCHG_SR(12)

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	XCHG_SR(13)

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	XCHG_SR(14)

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	XCHG_SR(15)

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	/* Clear BATs. */

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#define KVM_KILL_BAT(n, reg)		\

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        mtspr   SPRN_IBAT##n##U,reg;	\

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        mtspr   SPRN_IBAT##n##L,reg;	\

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        mtspr   SPRN_DBAT##n##U,reg;	\

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        mtspr   SPRN_DBAT##n##L,reg;	\

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        li	r9, 0

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	KVM_KILL_BAT(0, r9)

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	KVM_KILL_BAT(1, r9)

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	KVM_KILL_BAT(2, r9)

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	KVM_KILL_BAT(3, r9)

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.endm

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/******************************************************************************

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 *                                                                            *

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 *                               Exit code                                    *

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 *                                                                            *

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 *****************************************************************************/

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.macro LOAD_HOST_SEGMENTS

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	/* Register usage at this point:

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	 *

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	 * R1         = host R1

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	 * R2         = host R2

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	 * R12        = exit handler id

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	 * R13        = shadow vcpu - SHADOW_VCPU_OFF

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	 * SVCPU.*    = guest *

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	 * SVCPU[CR]  = guest CR

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	 * SVCPU[XER] = guest XER

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	 * SVCPU[CTR] = guest CTR

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	 * SVCPU[LR]  = guest LR

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	 *

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	 */

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	/* Restore BATs */

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	/* We only overwrite the upper part, so we only restoree

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	   the upper part. */

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#define KVM_LOAD_BAT(n, reg, RA, RB)	\

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	lwz	RA,(n*16)+0(reg);	\

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	lwz	RB,(n*16)+4(reg);	\

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	mtspr	SPRN_IBAT##n##U,RA;	\

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	mtspr	SPRN_IBAT##n##L,RB;	\

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	lwz	RA,(n*16)+8(reg);	\

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	lwz	RB,(n*16)+12(reg);	\

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	mtspr	SPRN_DBAT##n##U,RA;	\

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	mtspr	SPRN_DBAT##n##L,RB;	\

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	lis     r9, BATS@ha

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	addi    r9, r9, BATS@l

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	tophys(r9, r9)

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	KVM_LOAD_BAT(0, r9, r10, r11)

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	KVM_LOAD_BAT(1, r9, r10, r11)

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	KVM_LOAD_BAT(2, r9, r10, r11)

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	KVM_LOAD_BAT(3, r9, r10, r11)

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	/* Restore Segment Registers */

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	/* 0xc - 0xf */

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        li      r0, 4

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        mtctr   r0

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	LOAD_REG_IMMEDIATE(r3, 0x20000000 | (0x111 * 0xc))

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        lis     r4, 0xc000

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3:      mtsrin  r3, r4

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        addi    r3, r3, 0x111     /* increment VSID */

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        addis   r4, r4, 0x1000    /* address of next segment */

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        bdnz    3b

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	/* 0x0 - 0xb */

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	/* switch_mmu_context() needs paging, let's enable it */

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	mfmsr   r9

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	ori     r11, r9, MSR_DR

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	mtmsr   r11

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	sync

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	/* switch_mmu_context() clobbers r12, rescue it */

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	SAVE_GPR(12, r1)

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	/* Calling switch_mmu_context(<inv>, current->mm, <inv>); */

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	lwz	r4, MM(r2)

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	bl	switch_mmu_context

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	/* restore r12 */

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	REST_GPR(12, r1)

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	/* Disable paging again */

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	mfmsr   r9

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	li      r6, MSR_DR

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	andc    r9, r9, r6

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	mtmsr	r9

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	sync

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.endm

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