diff options
Diffstat (limited to 'kernel/arch/powerpc/kvm/book3s_64_slb.S')
| -rw-r--r-- | kernel/arch/powerpc/kvm/book3s_64_slb.S | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/kvm/book3s_64_slb.S b/kernel/arch/powerpc/kvm/book3s_64_slb.S new file mode 100644 index 000000000..3589c4e3d --- /dev/null +++ b/kernel/arch/powerpc/kvm/book3s_64_slb.S @@ -0,0 +1,153 @@ +/* + * 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_ENTRY_LEN 0x10 +#define OFFSET_ESID(x) (SHADOW_SLB_ENTRY_LEN * x) +#define OFFSET_VSID(x) ((SHADOW_SLB_ENTRY_LEN * x) + 8) + +/****************************************************************************** + * * + * 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 except R4, R6 + * SVCPU[CR] = guest CR + * SVCPU[XER] = guest XER + * SVCPU[CTR] = guest CTR + * SVCPU[LR] = guest LR + */ + +BEGIN_FW_FTR_SECTION + + /* Declare SLB shadow as 0 entries big */ + + ld r11, PACA_SLBSHADOWPTR(r13) + li r8, 0 + stb r8, 3(r11) + +END_FW_FTR_SECTION_IFSET(FW_FEATURE_LPAR) + + /* Flush SLB */ + + li r10, 0 + slbmte r10, r10 + slbia + + /* 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) + + andis. r9, r10, SLB_ESID_V@h + 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 + * + */ + + /* Remove all SLB entries that are in use. */ + + li r0, r0 + slbmte r0, r0 + slbia + + /* Restore bolted entries from the shadow */ + + ld r11, PACA_SLBSHADOWPTR(r13) + +BEGIN_FW_FTR_SECTION + + /* Declare SLB shadow as SLB_NUM_BOLTED entries big */ + + li r8, SLB_NUM_BOLTED + stb r8, 3(r11) + +END_FW_FTR_SECTION_IFSET(FW_FEATURE_LPAR) + + /* Manually load all entries from shadow SLB */ + + li r8, SLBSHADOW_SAVEAREA + li r7, SLBSHADOW_SAVEAREA + 8 + + .rept SLB_NUM_BOLTED + LDX_BE r10, r11, r8 + cmpdi r10, 0 + beq 1f + LDX_BE r9, r11, r7 + slbmte r9, r10 +1: addi r7, r7, SHADOW_SLB_ENTRY_LEN + addi r8, r8, SHADOW_SLB_ENTRY_LEN + .endr + + isync + sync + +slb_do_exit: + +.endm |