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powerpc: Always use SPRN_SPRG_HSCRATCH0 when running in HV mode 

This uses feature sections to arrange that we always use HSPRG1
as the scratch register in the interrupt entry code rather than
SPRG2 when we're running in hypervisor mode on POWER7.  This will
ensure that we don't trash the guest's SPRG2 when we are running
KVM guests.  To simplify the code, we define GET_SCRATCH0() and
SET_SCRATCH0() macros like the GET_PACA/SET_PACA macros.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
hifive-unleashed-5.1
Paul Mackerras 2011-04-05 13:59:58 +10:00 committed by Benjamin Herrenschmidt
parent b3e6b5dfcf
commit 673b189a2e
7 changed files with 41 additions and 28 deletions
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15
arch/powerpc/include/asm/exception-64s.h
View File

@ -60,16 +60,15 @@
#define EXC_HV H
#define EXC_STD
#define __EXCEPTION_PROLOG_1(area, h) \
#define EXCEPTION_PROLOG_1(area) \
GET_PACA(r13); \
std r9,area+EX_R9(r13); /* save r9 - r12 */ \
std r10,area+EX_R10(r13); \
std r11,area+EX_R11(r13); \
std r12,area+EX_R12(r13); \
mfspr r9,SPRN_SPRG_##h##SCRATCH0; \
GET_SCRATCH0(r9); \
std r9,area+EX_R13(r13); \
mfcr r9
#define EXCEPTION_PROLOG_1(area, h) __EXCEPTION_PROLOG_1(area, h)
#define __EXCEPTION_PROLOG_PSERIES_1(label, h) \
ld r12,PACAKBASE(r13); /* get high part of &label */ \
@ -85,7 +84,7 @@
__EXCEPTION_PROLOG_PSERIES_1(label, h)
#define EXCEPTION_PROLOG_PSERIES(area, label, h) \
EXCEPTION_PROLOG_1(area, h); \
EXCEPTION_PROLOG_1(area); \
EXCEPTION_PROLOG_PSERIES_1(label, h);
/*
@ -156,7 +155,7 @@
label##_pSeries: \
HMT_MEDIUM; \
DO_KVM vec; \
mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \
SET_SCRATCH0(r13); /* save r13 */ \
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, EXC_STD)
#define STD_EXCEPTION_HV(loc, vec, label) \
@ -165,13 +164,13 @@ label##_pSeries: \
label##_hv: \
HMT_MEDIUM; \
DO_KVM vec; \
mtspr SPRN_SPRG_HSCRATCH0,r13;/* save r13 */ \
SET_SCRATCH0(r13); /* save r13 */ \
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, EXC_HV)
#define __MASKABLE_EXCEPTION_PSERIES(vec, label, h) \
HMT_MEDIUM; \
DO_KVM vec; \
mtspr SPRN_SPRG_##h##SCRATCH0,r13; /* save r13 */ \
SET_SCRATCH0(r13); /* save r13 */ \
GET_PACA(r13); \
std r9,PACA_EXGEN+EX_R9(r13); /* save r9, r10 */ \
std r10,PACA_EXGEN+EX_R10(r13); \
@ -179,7 +178,7 @@ label##_hv: \
mfcr r9; \
cmpwi r10,0; \
beq masked_##h##interrupt; \
mfspr r10,SPRN_SPRG_##h##SCRATCH0; \
GET_SCRATCH0(r10); \
std r10,PACA_EXGEN+EX_R13(r13); \
std r11,PACA_EXGEN+EX_R11(r13); \
std r12,PACA_EXGEN+EX_R12(r13); \

14
arch/powerpc/include/asm/reg.h
View File

@ -802,6 +802,20 @@
FTR_SECTION_ELSE_NESTED(66); \
mtspr SPRN_SPRG_HPACA,rX; \
ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_HVMODE_206, 66)
#define GET_SCRATCH0(rX) \
BEGIN_FTR_SECTION_NESTED(66); \
mfspr rX,SPRN_SPRG_SCRATCH0; \
FTR_SECTION_ELSE_NESTED(66); \
mfspr rX,SPRN_SPRG_HSCRATCH0; \
ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_HVMODE_206, 66)
#define SET_SCRATCH0(rX) \
BEGIN_FTR_SECTION_NESTED(66); \
mtspr SPRN_SPRG_SCRATCH0,rX; \
FTR_SECTION_ELSE_NESTED(66); \
mtspr SPRN_SPRG_HSCRATCH0,rX; \
ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_HVMODE_206, 66)
#endif
#ifdef CONFIG_PPC_BOOK3E_64

26
arch/powerpc/kernel/exceptions-64s.S
View File

@ -43,7 +43,7 @@ __start_interrupts:
_machine_check_pSeries:
HMT_MEDIUM
DO_KVM 0x200
mtspr SPRN_SPRG_SCRATCH0,r13 /* save r13 */
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common, EXC_STD)
. = 0x300
@ -51,7 +51,7 @@ _machine_check_pSeries:
data_access_pSeries:
HMT_MEDIUM
DO_KVM 0x300
mtspr SPRN_SPRG_SCRATCH0,r13
SET_SCRATCH0(r13)
BEGIN_FTR_SECTION
GET_PACA(r13)
std r9,PACA_EXSLB+EX_R9(r13)
@ -67,7 +67,7 @@ BEGIN_FTR_SECTION
std r11,PACA_EXGEN+EX_R11(r13)
ld r11,PACA_EXSLB+EX_R9(r13)
std r12,PACA_EXGEN+EX_R12(r13)
mfspr r12,SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r12)
std r10,PACA_EXGEN+EX_R10(r13)
std r11,PACA_EXGEN+EX_R9(r13)
std r12,PACA_EXGEN+EX_R13(r13)
@ -81,7 +81,7 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_SLB)
data_access_slb_pSeries:
HMT_MEDIUM
DO_KVM 0x380
mtspr SPRN_SPRG_SCRATCH0,r13
SET_SCRATCH0(r13)
GET_PACA(r13)
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_DAR
@ -95,7 +95,7 @@ data_access_slb_pSeries:
std r10,PACA_EXSLB+EX_R10(r13)
std r11,PACA_EXSLB+EX_R11(r13)
std r12,PACA_EXSLB+EX_R12(r13)
mfspr r10,SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r10)
std r10,PACA_EXSLB+EX_R13(r13)
mfspr r12,SPRN_SRR1 /* and SRR1 */
#ifndef CONFIG_RELOCATABLE
@ -120,7 +120,7 @@ data_access_slb_pSeries:
instruction_access_slb_pSeries:
HMT_MEDIUM
DO_KVM 0x480
mtspr SPRN_SPRG_SCRATCH0,r13
SET_SCRATCH0(r13)
GET_PACA(r13)
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
@ -134,7 +134,7 @@ instruction_access_slb_pSeries:
std r10,PACA_EXSLB+EX_R10(r13)
std r11,PACA_EXSLB+EX_R11(r13)
std r12,PACA_EXSLB+EX_R12(r13)
mfspr r10,SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r10)
std r10,PACA_EXSLB+EX_R13(r13)
mfspr r12,SPRN_SRR1 /* and SRR1 */
#ifndef CONFIG_RELOCATABLE
@ -272,7 +272,7 @@ masked_interrupt:
rotldi r10,r10,16
mtspr SPRN_SRR1,r10
ld r10,PACA_EXGEN+EX_R10(r13)
mfspr r13,SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r13)
rfid
b .
@ -285,7 +285,7 @@ masked_Hinterrupt:
rotldi r10,r10,16
mtspr SPRN_HSRR1,r10
ld r10,PACA_EXGEN+EX_R10(r13)
mfspr r13,SPRN_SPRG_HSCRATCH0
GET_SCRATCH0(r13)
hrfid
b .
@ -293,7 +293,7 @@ masked_Hinterrupt:
do_stab_bolted_pSeries:
std r11,PACA_EXSLB+EX_R11(r13)
std r12,PACA_EXSLB+EX_R12(r13)
mfspr r10,SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r10)
std r10,PACA_EXSLB+EX_R13(r13)
EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD)
@ -305,14 +305,14 @@ do_stab_bolted_pSeries:
.align 7
system_reset_fwnmi:
HMT_MEDIUM
mtspr SPRN_SPRG_SCRATCH0,r13 /* save r13 */
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD)
.globl machine_check_fwnmi
.align 7
machine_check_fwnmi:
HMT_MEDIUM
mtspr SPRN_SPRG_SCRATCH0,r13 /* save r13 */
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common, EXC_STD)
#endif /* CONFIG_PPC_PSERIES */
@ -327,7 +327,7 @@ slb_miss_user_pseries:
std r10,PACA_EXGEN+EX_R10(r13)
std r11,PACA_EXGEN+EX_R11(r13)
std r12,PACA_EXGEN+EX_R12(r13)
mfspr r10,SPRG_SCRATCH0
GET_SCRATCH0(r10)
ld r11,PACA_EXSLB+EX_R9(r13)
ld r12,PACA_EXSLB+EX_R3(r13)
std r10,PACA_EXGEN+EX_R13(r13)

6
arch/powerpc/kvm/book3s_rmhandlers.S
View File

@ -70,7 +70,7 @@
.global kvmppc_trampoline_\intno
kvmppc_trampoline_\intno:
mtspr SPRN_SPRG_SCRATCH0, r13 /* Save r13 */
SET_SCRATCH0(r13) /* Save r13 */
/*
* First thing to do is to find out if we're coming
@ -89,7 +89,7 @@ kvmppc_trampoline_\intno:
lwz r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH1)(r13)
mtcr r12
PPC_LL r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13)
mfspr r13, SPRN_SPRG_SCRATCH0 /* r13 = original r13 */
GET_SCRATCH0(r13) /* r13 = original r13 */
b kvmppc_resume_\intno /* Get back original handler */
/* Now we know we're handling a KVM guest */
@ -157,7 +157,7 @@ kvmppc_handler_skip_ins:
lwz r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH1)(r13)
mtcr r12
PPC_LL r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13)
mfspr r13, SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r13)
/* And get back into the code */
RFI

2
arch/powerpc/kvm/book3s_segment.S
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@ -168,7 +168,7 @@ kvmppc_handler_trampoline_exit:
PPC_STL r4, (SHADOW_VCPU_OFF + SVCPU_SHADOW_SRR1)(r13)
/* Get scratch'ed off registers */
mfspr r9, SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r9)
PPC_LL r8, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13)
lwz r7, (SHADOW_VCPU_OFF + SVCPU_SCRATCH1)(r13)

2
arch/powerpc/platforms/iseries/exception.S
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@ -155,7 +155,7 @@ BEGIN_FTR_SECTION
std r12,PACA_EXGEN+EX_R13(r13)
EXCEPTION_PROLOG_ISERIES_1
FTR_SECTION_ELSE
EXCEPTION_PROLOG_1(PACA_EXGEN, EXC_STD)
EXCEPTION_PROLOG_1(PACA_EXGEN)
EXCEPTION_PROLOG_ISERIES_1
ALT_FTR_SECTION_END_IFCLR(CPU_FTR_SLB)
b data_access_common

4
arch/powerpc/platforms/iseries/exception.h
View File

@ -39,7 +39,7 @@
label##_iSeries: \
HMT_MEDIUM; \
mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \
EXCEPTION_PROLOG_1(area, EXC_STD); \
EXCEPTION_PROLOG_1(area); \
EXCEPTION_PROLOG_ISERIES_1; \
b label##_common
@ -48,7 +48,7 @@ label##_iSeries: \
label##_iSeries: \
HMT_MEDIUM; \
mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \
EXCEPTION_PROLOG_1(PACA_EXGEN, EXC_STD); \
EXCEPTION_PROLOG_1(PACA_EXGEN); \
lbz r10,PACASOFTIRQEN(r13); \
cmpwi 0,r10,0; \
beq- label##_iSeries_masked; \