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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/kvm/book3s_64_slb.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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#include <asm/asm-compat.h>

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#include <asm/feature-fixups.h>

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#define SHADOW_SLB_ENTRY_LEN	0x10

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#define OFFSET_ESID(x)		(SHADOW_SLB_ENTRY_LEN * x)

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#define OFFSET_VSID(x)		((SHADOW_SLB_ENTRY_LEN * x) + 8)

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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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	 * R13 = PACA

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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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BEGIN_FW_FTR_SECTION

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	/* Declare SLB shadow as 0 entries big */

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	ld	r11, PACA_SLBSHADOWPTR(r13)

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	li	r8, 0

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	stb	r8, 3(r11)

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END_FW_FTR_SECTION_IFSET(FW_FEATURE_LPAR)

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	/* Flush SLB */

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	li	r10, 0

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	slbmte	r10, r10

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	slbia

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	/* Fill SLB with our shadow */

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	lbz	r12, SVCPU_SLB_MAX(r3)

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	mulli	r12, r12, 16

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	addi	r12, r12, SVCPU_SLB

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	add	r12, r12, r3

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	/* for (r11 = kvm_slb; r11 < kvm_slb + kvm_slb_size; r11+=slb_entry) */

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	li	r11, SVCPU_SLB

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	add	r11, r11, r3

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slb_loop_enter:

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	ld	r10, 0(r11)

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	andis.	r9, r10, SLB_ESID_V@h

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	beq	slb_loop_enter_skip

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	ld	r9, 8(r11)

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	slbmte	r9, r10

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slb_loop_enter_skip:

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	addi	r11, r11, 16

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	cmpd	cr0, r11, r12

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	blt	slb_loop_enter

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slb_do_enter:

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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 [=PACA on PPC64]

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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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	/* Remove all SLB entries that are in use. */

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	li	r0, 0

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	slbmte	r0, r0

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	slbia

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	/* Restore bolted entries from the shadow */

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	ld	r11, PACA_SLBSHADOWPTR(r13)

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BEGIN_FW_FTR_SECTION

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	/* Declare SLB shadow as SLB_NUM_BOLTED entries big */

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	li	r8, SLB_NUM_BOLTED

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	stb	r8, 3(r11)

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END_FW_FTR_SECTION_IFSET(FW_FEATURE_LPAR)

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	/* Manually load all entries from shadow SLB */

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	li	r8, SLBSHADOW_SAVEAREA

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	li	r7, SLBSHADOW_SAVEAREA + 8

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	.rept	SLB_NUM_BOLTED

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	LDX_BE	r10, r11, r8

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	cmpdi	r10, 0

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	beq	1f

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	LDX_BE	r9, r11, r7

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	slbmte	r9, r10

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1:	addi	r7, r7, SHADOW_SLB_ENTRY_LEN

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	addi	r8, r8, SHADOW_SLB_ENTRY_LEN

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	.endr

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	isync

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	sync

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slb_do_exit:

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.endm

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