mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
53e5b8bbbd
We just introduced generic segment switching code that only needs to call small macros to do the actual switching, but keeps most of the entry / exit code generic. So let's move the SLB switching code over to use this new mechanism. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
168 lines
4.1 KiB
ArmAsm
168 lines
4.1 KiB
ArmAsm
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License, version 2, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
* Copyright SUSE Linux Products GmbH 2009
|
|
*
|
|
* Authors: Alexander Graf <agraf@suse.de>
|
|
*/
|
|
|
|
#define SHADOW_SLB_ESID(num) (SLBSHADOW_SAVEAREA + (num * 0x10))
|
|
#define SHADOW_SLB_VSID(num) (SLBSHADOW_SAVEAREA + (num * 0x10) + 0x8)
|
|
#define UNBOLT_SLB_ENTRY(num) \
|
|
ld r9, SHADOW_SLB_ESID(num)(r12); \
|
|
/* Invalid? Skip. */; \
|
|
rldicl. r0, r9, 37, 63; \
|
|
beq slb_entry_skip_ ## num; \
|
|
xoris r9, r9, SLB_ESID_V@h; \
|
|
std r9, SHADOW_SLB_ESID(num)(r12); \
|
|
slb_entry_skip_ ## num:
|
|
|
|
#define REBOLT_SLB_ENTRY(num) \
|
|
ld r10, SHADOW_SLB_ESID(num)(r11); \
|
|
cmpdi r10, 0; \
|
|
beq slb_exit_skip_ ## num; \
|
|
oris r10, r10, SLB_ESID_V@h; \
|
|
ld r9, SHADOW_SLB_VSID(num)(r11); \
|
|
slbmte r9, r10; \
|
|
std r10, SHADOW_SLB_ESID(num)(r11); \
|
|
slb_exit_skip_ ## num:
|
|
|
|
/******************************************************************************
|
|
* *
|
|
* Entry code *
|
|
* *
|
|
*****************************************************************************/
|
|
|
|
.macro LOAD_GUEST_SEGMENTS
|
|
|
|
/* Required state:
|
|
*
|
|
* MSR = ~IR|DR
|
|
* R13 = PACA
|
|
* R1 = host R1
|
|
* R2 = host R2
|
|
* R3 = shadow vcpu
|
|
* all other volatile GPRS = free
|
|
* SVCPU[CR] = guest CR
|
|
* SVCPU[XER] = guest XER
|
|
* SVCPU[CTR] = guest CTR
|
|
* SVCPU[LR] = guest LR
|
|
*/
|
|
|
|
/* Remove LPAR shadow entries */
|
|
|
|
#if SLB_NUM_BOLTED == 3
|
|
|
|
ld r12, PACA_SLBSHADOWPTR(r13)
|
|
|
|
/* Save off the first entry so we can slbie it later */
|
|
ld r10, SHADOW_SLB_ESID(0)(r12)
|
|
ld r11, SHADOW_SLB_VSID(0)(r12)
|
|
|
|
/* Remove bolted entries */
|
|
UNBOLT_SLB_ENTRY(0)
|
|
UNBOLT_SLB_ENTRY(1)
|
|
UNBOLT_SLB_ENTRY(2)
|
|
|
|
#else
|
|
#error unknown number of bolted entries
|
|
#endif
|
|
|
|
/* Flush SLB */
|
|
|
|
slbia
|
|
|
|
/* r0 = esid & ESID_MASK */
|
|
rldicr r10, r10, 0, 35
|
|
/* r0 |= CLASS_BIT(VSID) */
|
|
rldic r12, r11, 56 - 36, 36
|
|
or r10, r10, r12
|
|
slbie r10
|
|
|
|
isync
|
|
|
|
/* Fill SLB with our shadow */
|
|
|
|
lbz r12, SVCPU_SLB_MAX(r3)
|
|
mulli r12, r12, 16
|
|
addi r12, r12, SVCPU_SLB
|
|
add r12, r12, r3
|
|
|
|
/* for (r11 = kvm_slb; r11 < kvm_slb + kvm_slb_size; r11+=slb_entry) */
|
|
li r11, SVCPU_SLB
|
|
add r11, r11, r3
|
|
|
|
slb_loop_enter:
|
|
|
|
ld r10, 0(r11)
|
|
|
|
rldicl. r0, r10, 37, 63
|
|
beq slb_loop_enter_skip
|
|
|
|
ld r9, 8(r11)
|
|
slbmte r9, r10
|
|
|
|
slb_loop_enter_skip:
|
|
addi r11, r11, 16
|
|
cmpd cr0, r11, r12
|
|
blt slb_loop_enter
|
|
|
|
slb_do_enter:
|
|
|
|
.endm
|
|
|
|
/******************************************************************************
|
|
* *
|
|
* Exit code *
|
|
* *
|
|
*****************************************************************************/
|
|
|
|
.macro LOAD_HOST_SEGMENTS
|
|
|
|
/* Register usage at this point:
|
|
*
|
|
* R1 = host R1
|
|
* R2 = host R2
|
|
* R12 = exit handler id
|
|
* R13 = shadow vcpu - SHADOW_VCPU_OFF [=PACA on PPC64]
|
|
* SVCPU.* = guest *
|
|
* SVCPU[CR] = guest CR
|
|
* SVCPU[XER] = guest XER
|
|
* SVCPU[CTR] = guest CTR
|
|
* SVCPU[LR] = guest LR
|
|
*
|
|
*/
|
|
|
|
/* Restore bolted entries from the shadow and fix it along the way */
|
|
|
|
/* We don't store anything in entry 0, so we don't need to take care of it */
|
|
slbia
|
|
isync
|
|
|
|
#if SLB_NUM_BOLTED == 3
|
|
|
|
ld r11, PACA_SLBSHADOWPTR(r13)
|
|
|
|
REBOLT_SLB_ENTRY(0)
|
|
REBOLT_SLB_ENTRY(1)
|
|
REBOLT_SLB_ENTRY(2)
|
|
|
|
#else
|
|
#error unknown number of bolted entries
|
|
#endif
|
|
|
|
slb_do_exit:
|
|
|
|
.endm
|