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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 22:26:41 +07:00
7ef4e985d5
In addition to normal "priviledged instruction" traps, we can also receive "emulation assist" traps on newer hardware that has the HV bit set. Handle that one the same way as a privileged instruction, including the instruction fetching. That way we don't execute old instructions that we happen to still leave in that field when an emul assist trap comes. This fixes -M mac99 / -M g3beige on p7 bare metal for me. Signed-off-by: Alexander Graf <agraf@suse.de>
360 lines
8.6 KiB
ArmAsm
360 lines
8.6 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 2010
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*
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* Authors: Alexander Graf <agraf@suse.de>
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*/
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/* Real mode helpers */
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#if defined(CONFIG_PPC_BOOK3S_64)
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#define GET_SHADOW_VCPU(reg) \
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mr reg, r13
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#define MTMSR_EERI(reg) mtmsrd (reg),1
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#elif defined(CONFIG_PPC_BOOK3S_32)
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#define GET_SHADOW_VCPU(reg) \
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tophys(reg, r2); \
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lwz reg, (THREAD + THREAD_KVM_SVCPU)(reg); \
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tophys(reg, reg)
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#define MTMSR_EERI(reg) mtmsr (reg)
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#endif
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/* Disable for nested KVM */
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#define USE_QUICK_LAST_INST
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/* Get helper functions for subarch specific functionality */
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#if defined(CONFIG_PPC_BOOK3S_64)
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#include "book3s_64_slb.S"
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#elif defined(CONFIG_PPC_BOOK3S_32)
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#include "book3s_32_sr.S"
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#endif
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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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* R1 = host R1
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* R2 = host R2
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* R4 = guest shadow MSR
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* R5 = normal host MSR
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* R6 = current host MSR (EE, IR, DR off)
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* LR = highmem guest exit code
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* all other volatile GPRS = free
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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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/* r3 = shadow vcpu */
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GET_SHADOW_VCPU(r3)
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/* Save guest exit handler address and MSR */
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mflr r0
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PPC_STL r0, HSTATE_VMHANDLER(r3)
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PPC_STL r5, HSTATE_HOST_MSR(r3)
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/* Save R1/R2 in the PACA (64-bit) or shadow_vcpu (32-bit) */
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PPC_STL r1, HSTATE_HOST_R1(r3)
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PPC_STL r2, HSTATE_HOST_R2(r3)
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/* Activate guest mode, so faults get handled by KVM */
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li r11, KVM_GUEST_MODE_GUEST
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stb r11, HSTATE_IN_GUEST(r3)
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/* Switch to guest segment. This is subarch specific. */
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LOAD_GUEST_SEGMENTS
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#ifdef CONFIG_PPC_BOOK3S_64
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/* Some guests may need to have dcbz set to 32 byte length.
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*
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* Usually we ensure that by patching the guest's instructions
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* to trap on dcbz and emulate it in the hypervisor.
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*
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* If we can, we should tell the CPU to use 32 byte dcbz though,
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* because that's a lot faster.
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*/
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lbz r0, HSTATE_RESTORE_HID5(r3)
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cmpwi r0, 0
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beq no_dcbz32_on
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mfspr r0,SPRN_HID5
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ori r0, r0, 0x80 /* XXX HID5_dcbz32 = 0x80 */
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mtspr SPRN_HID5,r0
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no_dcbz32_on:
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#endif /* CONFIG_PPC_BOOK3S_64 */
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/* Enter guest */
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PPC_LL r8, SVCPU_CTR(r3)
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PPC_LL r9, SVCPU_LR(r3)
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lwz r10, SVCPU_CR(r3)
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lwz r11, SVCPU_XER(r3)
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mtctr r8
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mtlr r9
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mtcr r10
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mtxer r11
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/* Move SRR0 and SRR1 into the respective regs */
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PPC_LL r9, SVCPU_PC(r3)
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/* First clear RI in our current MSR value */
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li r0, MSR_RI
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andc r6, r6, r0
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MTMSR_EERI(r6)
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mtsrr0 r9
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mtsrr1 r4
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PPC_LL r0, SVCPU_R0(r3)
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PPC_LL r1, SVCPU_R1(r3)
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PPC_LL r2, SVCPU_R2(r3)
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PPC_LL r4, SVCPU_R4(r3)
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PPC_LL r5, SVCPU_R5(r3)
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PPC_LL r6, SVCPU_R6(r3)
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PPC_LL r7, SVCPU_R7(r3)
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PPC_LL r8, SVCPU_R8(r3)
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PPC_LL r9, SVCPU_R9(r3)
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PPC_LL r10, SVCPU_R10(r3)
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PPC_LL r11, SVCPU_R11(r3)
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PPC_LL r12, SVCPU_R12(r3)
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PPC_LL r13, SVCPU_R13(r3)
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PPC_LL r3, (SVCPU_R3)(r3)
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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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.global kvmppc_interrupt
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kvmppc_interrupt:
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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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* R12 = exit handler id
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* R13 = shadow vcpu (32-bit) or PACA (64-bit)
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* HSTATE.SCRATCH0 = guest R12
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* HSTATE.SCRATCH1 = guest CR
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*
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*/
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/* Save registers */
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PPC_STL r0, SVCPU_R0(r13)
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PPC_STL r1, SVCPU_R1(r13)
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PPC_STL r2, SVCPU_R2(r13)
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PPC_STL r3, SVCPU_R3(r13)
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PPC_STL r4, SVCPU_R4(r13)
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PPC_STL r5, SVCPU_R5(r13)
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PPC_STL r6, SVCPU_R6(r13)
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PPC_STL r7, SVCPU_R7(r13)
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PPC_STL r8, SVCPU_R8(r13)
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PPC_STL r9, SVCPU_R9(r13)
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PPC_STL r10, SVCPU_R10(r13)
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PPC_STL r11, SVCPU_R11(r13)
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/* Restore R1/R2 so we can handle faults */
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PPC_LL r1, HSTATE_HOST_R1(r13)
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PPC_LL r2, HSTATE_HOST_R2(r13)
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/* Save guest PC and MSR */
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#ifdef CONFIG_PPC64
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BEGIN_FTR_SECTION
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andi. r0,r12,0x2
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beq 1f
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mfspr r3,SPRN_HSRR0
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mfspr r4,SPRN_HSRR1
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andi. r12,r12,0x3ffd
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b 2f
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END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
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#endif
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1: mfsrr0 r3
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mfsrr1 r4
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2:
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PPC_STL r3, SVCPU_PC(r13)
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PPC_STL r4, SVCPU_SHADOW_SRR1(r13)
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/* Get scratch'ed off registers */
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GET_SCRATCH0(r9)
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PPC_LL r8, HSTATE_SCRATCH0(r13)
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lwz r7, HSTATE_SCRATCH1(r13)
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PPC_STL r9, SVCPU_R13(r13)
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PPC_STL r8, SVCPU_R12(r13)
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stw r7, SVCPU_CR(r13)
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/* Save more register state */
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mfxer r5
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mfdar r6
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mfdsisr r7
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mfctr r8
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mflr r9
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stw r5, SVCPU_XER(r13)
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PPC_STL r6, SVCPU_FAULT_DAR(r13)
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stw r7, SVCPU_FAULT_DSISR(r13)
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PPC_STL r8, SVCPU_CTR(r13)
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PPC_STL r9, SVCPU_LR(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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cmpwi r12, BOOK3S_INTERRUPT_SYSCALL
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beq ld_last_prev_inst
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cmpwi r12, BOOK3S_INTERRUPT_ALIGNMENT
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beq- ld_last_inst
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#ifdef CONFIG_PPC64
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BEGIN_FTR_SECTION
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cmpwi r12, BOOK3S_INTERRUPT_H_EMUL_ASSIST
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beq- ld_last_inst
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END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
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#endif
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b no_ld_last_inst
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ld_last_prev_inst:
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addi r3, r3, -4
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ld_last_inst:
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/* Save off the guest instruction we're at */
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/* In case lwz faults */
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li r0, KVM_INST_FETCH_FAILED
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#ifdef USE_QUICK_LAST_INST
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/* Set guest mode to 'jump over instruction' so if lwz faults
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* we'll just continue at the next IP. */
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li r9, KVM_GUEST_MODE_SKIP
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stb r9, HSTATE_IN_GUEST(r13)
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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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sync
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/* 2) fetch the instruction */
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lwz r0, 0(r3)
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/* 3) disable paging again */
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mtmsr r9
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sync
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#endif
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stw r0, SVCPU_LAST_INST(r13)
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no_ld_last_inst:
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/* Unset guest mode */
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li r9, KVM_GUEST_MODE_NONE
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stb r9, HSTATE_IN_GUEST(r13)
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/* Switch back to host MMU */
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LOAD_HOST_SEGMENTS
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#ifdef CONFIG_PPC_BOOK3S_64
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lbz r5, HSTATE_RESTORE_HID5(r13)
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cmpwi r5, 0
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beq no_dcbz32_off
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li r4, 0
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mfspr r5,SPRN_HID5
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rldimi r5,r4,6,56
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mtspr SPRN_HID5,r5
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no_dcbz32_off:
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#endif /* CONFIG_PPC_BOOK3S_64 */
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/*
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* For some interrupts, we need to call the real Linux
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* handler, so it can do work for us. This has to happen
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* as if the interrupt arrived from the kernel though,
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* so let's fake it here where most state is restored.
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*
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* Having set up SRR0/1 with the address where we want
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* to continue with relocation on (potentially in module
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* space), we either just go straight there with rfi[d],
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* or we jump to an interrupt handler with bctr if there
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* is an interrupt to be handled first. In the latter
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* case, the rfi[d] at the end of the interrupt handler
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* will get us back to where we want to continue.
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*/
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cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL
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beq 1f
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cmpwi r12, BOOK3S_INTERRUPT_DECREMENTER
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beq 1f
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cmpwi r12, BOOK3S_INTERRUPT_PERFMON
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1: mtctr r12
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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 (32-bit) or PACA (64-bit)
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* SVCPU.* = guest *
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*
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*/
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PPC_LL r6, HSTATE_HOST_MSR(r13)
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PPC_LL r8, HSTATE_VMHANDLER(r13)
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/* Restore host msr -> SRR1 */
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mtsrr1 r6
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/* Load highmem handler address */
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mtsrr0 r8
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/* RFI into the highmem handler, or jump to interrupt handler */
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beqctr
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RFI
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kvmppc_handler_trampoline_exit_end:
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