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b480f780f0
When we're loading bolted entries into the SLB again, we're checking if an entry is in use and only slbmte it when it is. Unfortunately, the check always goes to the skip label of the first entry, resulting in an endless loop when it actually gets triggered. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
263 lines
6.2 KiB
ArmAsm
263 lines
6.2 KiB
ArmAsm
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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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 <agraf@suse.de>
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*/
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#define SHADOW_SLB_ESID(num) (SLBSHADOW_SAVEAREA + (num * 0x10))
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#define SHADOW_SLB_VSID(num) (SLBSHADOW_SAVEAREA + (num * 0x10) + 0x8)
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#define UNBOLT_SLB_ENTRY(num) \
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ld r9, SHADOW_SLB_ESID(num)(r12); \
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/* Invalid? Skip. */; \
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rldicl. r0, r9, 37, 63; \
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beq slb_entry_skip_ ## num; \
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xoris r9, r9, SLB_ESID_V@h; \
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std r9, SHADOW_SLB_ESID(num)(r12); \
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slb_entry_skip_ ## num:
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#define REBOLT_SLB_ENTRY(num) \
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ld r10, SHADOW_SLB_ESID(num)(r11); \
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cmpdi r10, 0; \
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beq slb_exit_skip_ ## num; \
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oris r10, r10, SLB_ESID_V@h; \
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ld r9, SHADOW_SLB_VSID(num)(r11); \
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slbmte r9, r10; \
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std r10, SHADOW_SLB_ESID(num)(r11); \
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slb_exit_skip_ ## num:
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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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.global kvmppc_handler_trampoline_enter
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kvmppc_handler_trampoline_enter:
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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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* R9 = guest IP
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* R10 = guest MSR
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* R11 = free
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* R12 = free
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* PACA[PACA_EXMC + EX_R9] = guest R9
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* PACA[PACA_EXMC + EX_R10] = guest R10
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* PACA[PACA_EXMC + EX_R11] = guest R11
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* PACA[PACA_EXMC + EX_R12] = guest R12
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* PACA[PACA_EXMC + EX_R13] = guest R13
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* PACA[PACA_EXMC + EX_CCR] = guest CR
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* PACA[PACA_EXMC + EX_R3] = guest XER
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*/
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mtsrr0 r9
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mtsrr1 r10
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mtspr SPRN_SPRG_SCRATCH0, r0
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/* Remove LPAR shadow entries */
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#if SLB_NUM_BOLTED == 3
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ld r12, PACA_SLBSHADOWPTR(r13)
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/* Save off the first entry so we can slbie it later */
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ld r10, SHADOW_SLB_ESID(0)(r12)
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ld r11, SHADOW_SLB_VSID(0)(r12)
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/* Remove bolted entries */
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UNBOLT_SLB_ENTRY(0)
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UNBOLT_SLB_ENTRY(1)
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UNBOLT_SLB_ENTRY(2)
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#else
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#error unknown number of bolted entries
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#endif
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/* Flush SLB */
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slbia
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/* r0 = esid & ESID_MASK */
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rldicr r10, r10, 0, 35
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/* r0 |= CLASS_BIT(VSID) */
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rldic r12, r11, 56 - 36, 36
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or r10, r10, r12
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slbie r10
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isync
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/* Fill SLB with our shadow */
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lbz r12, PACA_KVM_SLB_MAX(r13)
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mulli r12, r12, 16
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addi r12, r12, PACA_KVM_SLB
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add r12, r12, r13
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/* for (r11 = kvm_slb; r11 < kvm_slb + kvm_slb_size; r11+=slb_entry) */
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li r11, PACA_KVM_SLB
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add r11, r11, r13
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slb_loop_enter:
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ld r10, 0(r11)
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rldicl. r0, r10, 37, 63
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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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/* Enter guest */
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mfspr r0, SPRN_SPRG_SCRATCH0
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ld r9, (PACA_EXMC+EX_R9)(r13)
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ld r10, (PACA_EXMC+EX_R10)(r13)
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ld r12, (PACA_EXMC+EX_R12)(r13)
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lwz r11, (PACA_EXMC+EX_CCR)(r13)
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mtcr r11
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ld r11, (PACA_EXMC+EX_R3)(r13)
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mtxer r11
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ld r11, (PACA_EXMC+EX_R11)(r13)
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ld r13, (PACA_EXMC+EX_R13)(r13)
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RFI
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kvmppc_handler_trampoline_enter_end:
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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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.global kvmppc_handler_trampoline_exit
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kvmppc_handler_trampoline_exit:
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/* Register usage at this point:
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*
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* SPRG_SCRATCH0 = guest R13
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* R01 = host R1
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* R02 = host R2
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* R10 = guest PC
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* R11 = guest MSR
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* R12 = exit handler id
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* R13 = PACA
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* PACA.exmc.CCR = guest CR
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* PACA.exmc.R9 = guest R1
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* PACA.exmc.R10 = guest R10
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* PACA.exmc.R11 = guest R11
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* PACA.exmc.R12 = guest R12
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* PACA.exmc.R13 = guest R2
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*
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*/
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/* Save registers */
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std r0, (PACA_EXMC+EX_SRR0)(r13)
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std r9, (PACA_EXMC+EX_R3)(r13)
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std r10, (PACA_EXMC+EX_LR)(r13)
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std r11, (PACA_EXMC+EX_DAR)(r13)
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/*
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* In order for us to easily get the last instruction,
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* we got the #vmexit at, we exploit the fact that the
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* virtual layout is still the same here, so we can just
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* ld from the guest's PC address
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*/
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/* We only load the last instruction when it's safe */
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cmpwi r12, BOOK3S_INTERRUPT_DATA_STORAGE
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beq ld_last_inst
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cmpwi r12, BOOK3S_INTERRUPT_PROGRAM
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beq ld_last_inst
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b no_ld_last_inst
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ld_last_inst:
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/* Save off the guest instruction we're at */
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/* 1) enable paging for data */
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mfmsr r9
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ori r11, r9, MSR_DR /* Enable paging for data */
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mtmsr r11
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/* 2) fetch the instruction */
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lwz r0, 0(r10)
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/* 3) disable paging again */
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mtmsr r9
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no_ld_last_inst:
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/* Restore bolted entries from the shadow and fix it along the way */
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/* We don't store anything in entry 0, so we don't need to take care of it */
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slbia
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isync
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#if SLB_NUM_BOLTED == 3
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ld r11, PACA_SLBSHADOWPTR(r13)
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REBOLT_SLB_ENTRY(0)
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REBOLT_SLB_ENTRY(1)
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REBOLT_SLB_ENTRY(2)
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#else
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#error unknown number of bolted entries
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#endif
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slb_do_exit:
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/* Restore registers */
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ld r11, (PACA_EXMC+EX_DAR)(r13)
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ld r10, (PACA_EXMC+EX_LR)(r13)
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ld r9, (PACA_EXMC+EX_R3)(r13)
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/* Save last inst */
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stw r0, (PACA_EXMC+EX_LR)(r13)
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/* Save DAR and DSISR before going to paged mode */
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mfdar r0
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std r0, (PACA_EXMC+EX_DAR)(r13)
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mfdsisr r0
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stw r0, (PACA_EXMC+EX_DSISR)(r13)
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/* RFI into the highmem handler */
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mfmsr r0
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ori r0, r0, MSR_IR|MSR_DR|MSR_RI /* Enable paging */
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mtsrr1 r0
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ld r0, PACASAVEDMSR(r13) /* Highmem handler address */
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mtsrr0 r0
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mfspr r0, SPRN_SPRG_SCRATCH0
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RFI
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kvmppc_handler_trampoline_exit_end:
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