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linux/arch/powerpc/kvm/bookehv_interrupts.S
Mihai Caraman e51f8f32d6 KVM: PPC: bookehv64: Add support for interrupt handling 
Add interrupt handling support for 64-bit bookehv hosts. Unify 32 and 64 bit
implementations using a common stack layout and a common execution flow starting
from kvm_handler_common macro. Update documentation for 64-bit input register
values. This patch only address the bolted TLB miss exception handlers version.

Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2012-12-06 01:34:11 +01:00

713 lines
21 KiB
ArmAsm
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/*
* 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 (C) 2010-2011 Freescale Semiconductor, Inc.
*
* Author: Varun Sethi <varun.sethi@freescale.com>
* Author: Scott Wood <scotwood@freescale.com>
* Author: Mihai Caraman <mihai.caraman@freescale.com>
*
* This file is derived from arch/powerpc/kvm/booke_interrupts.S
*/
#include <asm/ppc_asm.h>
#include <asm/kvm_asm.h>
#include <asm/reg.h>
#include <asm/mmu-44x.h>
#include <asm/page.h>
#include <asm/asm-compat.h>
#include <asm/asm-offsets.h>
#include <asm/bitsperlong.h>
#include <asm/thread_info.h>
#ifdef CONFIG_64BIT
#include <asm/exception-64e.h>
#else
#include "../kernel/head_booke.h" /* for THREAD_NORMSAVE() */
#endif
#define LONGBYTES (BITS_PER_LONG / 8)
#define VCPU_GUEST_SPRG(n) (VCPU_GUEST_SPRGS + (n * LONGBYTES))
/* The host stack layout: */
#define HOST_R1 0 /* Implied by stwu. */
#define HOST_CALLEE_LR PPC_LR_STKOFF
#define HOST_RUN (HOST_CALLEE_LR + LONGBYTES)
/*
* r2 is special: it holds 'current', and it made nonvolatile in the
* kernel with the -ffixed-r2 gcc option.
*/
#define HOST_R2 (HOST_RUN + LONGBYTES)
#define HOST_CR (HOST_R2 + LONGBYTES)
#define HOST_NV_GPRS (HOST_CR + LONGBYTES)
#define __HOST_NV_GPR(n) (HOST_NV_GPRS + ((n - 14) * LONGBYTES))
#define HOST_NV_GPR(n) __HOST_NV_GPR(__REG_##n)
#define HOST_MIN_STACK_SIZE (HOST_NV_GPR(R31) + LONGBYTES)
#define HOST_STACK_SIZE ((HOST_MIN_STACK_SIZE + 15) & ~15) /* Align. */
/* LR in caller stack frame. */
#define HOST_STACK_LR (HOST_STACK_SIZE + PPC_LR_STKOFF)
#define NEED_EMU 0x00000001 /* emulation -- save nv regs */
#define NEED_DEAR 0x00000002 /* save faulting DEAR */
#define NEED_ESR 0x00000004 /* save faulting ESR */
/*
* On entry:
* r4 = vcpu, r5 = srr0, r6 = srr1
* saved in vcpu: cr, ctr, r3-r13
*/
.macro kvm_handler_common intno, srr0, flags
/* Restore host stack pointer */
PPC_STL r1, VCPU_GPR(R1)(r4)
PPC_STL r2, VCPU_GPR(R2)(r4)
PPC_LL r1, VCPU_HOST_STACK(r4)
PPC_LL r2, HOST_R2(r1)
mfspr r10, SPRN_PID
lwz r8, VCPU_HOST_PID(r4)
PPC_LL r11, VCPU_SHARED(r4)
PPC_STL r14, VCPU_GPR(R14)(r4) /* We need a non-volatile GPR. */
li r14, \intno
stw r10, VCPU_GUEST_PID(r4)
mtspr SPRN_PID, r8
#ifdef CONFIG_KVM_EXIT_TIMING
/* save exit time */
1: mfspr r7, SPRN_TBRU
mfspr r8, SPRN_TBRL
mfspr r9, SPRN_TBRU
cmpw r9, r7
stw r8, VCPU_TIMING_EXIT_TBL(r4)
bne- 1b
stw r9, VCPU_TIMING_EXIT_TBU(r4)
#endif
oris r8, r6, MSR_CE@h
PPC_STD(r6, VCPU_SHARED_MSR, r11)
ori r8, r8, MSR_ME | MSR_RI
PPC_STL r5, VCPU_PC(r4)
/*
* Make sure CE/ME/RI are set (if appropriate for exception type)
* whether or not the guest had it set. Since mfmsr/mtmsr are
* somewhat expensive, skip in the common case where the guest
* had all these bits set (and thus they're still set if
* appropriate for the exception type).
*/
cmpw r6, r8
beq 1f
mfmsr r7
.if \srr0 != SPRN_MCSRR0 && \srr0 != SPRN_CSRR0
oris r7, r7, MSR_CE@h
.endif
.if \srr0 != SPRN_MCSRR0
ori r7, r7, MSR_ME | MSR_RI
.endif
mtmsr r7
1:
.if \flags & NEED_EMU
/*
* This assumes you have external PID support.
* To support a bookehv CPU without external PID, you'll
* need to look up the TLB entry and create a temporary mapping.
*
* FIXME: we don't currently handle if the lwepx faults. PR-mode
* booke doesn't handle it either. Since Linux doesn't use
* broadcast tlbivax anymore, the only way this should happen is
* if the guest maps its memory execute-but-not-read, or if we
* somehow take a TLB miss in the middle of this entry code and
* evict the relevant entry. On e500mc, all kernel lowmem is
* bolted into TLB1 large page mappings, and we don't use
* broadcast invalidates, so we should not take a TLB miss here.
*
* Later we'll need to deal with faults here. Disallowing guest
* mappings that are execute-but-not-read could be an option on
* e500mc, but not on chips with an LRAT if it is used.
*/
mfspr r3, SPRN_EPLC /* will already have correct ELPID and EGS */
PPC_STL r15, VCPU_GPR(R15)(r4)
PPC_STL r16, VCPU_GPR(R16)(r4)
PPC_STL r17, VCPU_GPR(R17)(r4)
PPC_STL r18, VCPU_GPR(R18)(r4)
PPC_STL r19, VCPU_GPR(R19)(r4)
mr r8, r3
PPC_STL r20, VCPU_GPR(R20)(r4)
rlwimi r8, r6, EPC_EAS_SHIFT - MSR_IR_LG, EPC_EAS
PPC_STL r21, VCPU_GPR(R21)(r4)
rlwimi r8, r6, EPC_EPR_SHIFT - MSR_PR_LG, EPC_EPR
PPC_STL r22, VCPU_GPR(R22)(r4)
rlwimi r8, r10, EPC_EPID_SHIFT, EPC_EPID
PPC_STL r23, VCPU_GPR(R23)(r4)
PPC_STL r24, VCPU_GPR(R24)(r4)
PPC_STL r25, VCPU_GPR(R25)(r4)
PPC_STL r26, VCPU_GPR(R26)(r4)
PPC_STL r27, VCPU_GPR(R27)(r4)
PPC_STL r28, VCPU_GPR(R28)(r4)
PPC_STL r29, VCPU_GPR(R29)(r4)
PPC_STL r30, VCPU_GPR(R30)(r4)
PPC_STL r31, VCPU_GPR(R31)(r4)
mtspr SPRN_EPLC, r8
/* disable preemption, so we are sure we hit the fixup handler */
CURRENT_THREAD_INFO(r8, r1)
li r7, 1
stw r7, TI_PREEMPT(r8)
isync
/*
* In case the read goes wrong, we catch it and write an invalid value
* in LAST_INST instead.
*/
1: lwepx r9, 0, r5
2:
.section .fixup, "ax"
3: li r9, KVM_INST_FETCH_FAILED
b 2b
.previous
.section __ex_table,"a"
PPC_LONG_ALIGN
PPC_LONG 1b,3b
.previous
mtspr SPRN_EPLC, r3
li r7, 0
stw r7, TI_PREEMPT(r8)
stw r9, VCPU_LAST_INST(r4)
.endif
.if \flags & NEED_ESR
mfspr r8, SPRN_ESR
PPC_STL r8, VCPU_FAULT_ESR(r4)
.endif
.if \flags & NEED_DEAR
mfspr r9, SPRN_DEAR
PPC_STL r9, VCPU_FAULT_DEAR(r4)
.endif
b kvmppc_resume_host
.endm
#ifdef CONFIG_64BIT
/* Exception types */
#define EX_GEN 1
#define EX_GDBELL 2
#define EX_DBG 3
#define EX_MC 4
#define EX_CRIT 5
#define EX_TLB 6
/*
* For input register values, see arch/powerpc/include/asm/kvm_booke_hv_asm.h
*/
.macro kvm_handler intno type scratch, paca_ex, ex_r10, ex_r11, srr0, srr1, flags
_GLOBAL(kvmppc_handler_\intno\()_\srr1)
mr r11, r4
/*
* Get vcpu from Paca: paca->__current.thread->kvm_vcpu
*/
PPC_LL r4, PACACURRENT(r13)
PPC_LL r4, (THREAD + THREAD_KVM_VCPU)(r4)
stw r10, VCPU_CR(r4)
PPC_STL r11, VCPU_GPR(R4)(r4)
PPC_STL r5, VCPU_GPR(R5)(r4)
.if \type == EX_CRIT
PPC_LL r5, (\paca_ex + EX_R13)(r13)
.else
mfspr r5, \scratch
.endif
PPC_STL r6, VCPU_GPR(R6)(r4)
PPC_STL r8, VCPU_GPR(R8)(r4)
PPC_STL r9, VCPU_GPR(R9)(r4)
PPC_STL r5, VCPU_GPR(R13)(r4)
PPC_LL r6, (\paca_ex + \ex_r10)(r13)
PPC_LL r8, (\paca_ex + \ex_r11)(r13)
PPC_STL r3, VCPU_GPR(R3)(r4)
PPC_STL r7, VCPU_GPR(R7)(r4)
PPC_STL r12, VCPU_GPR(R12)(r4)
PPC_STL r6, VCPU_GPR(R10)(r4)
PPC_STL r8, VCPU_GPR(R11)(r4)
mfctr r5
PPC_STL r5, VCPU_CTR(r4)
mfspr r5, \srr0
mfspr r6, \srr1
kvm_handler_common \intno, \srr0, \flags
.endm
#define EX_PARAMS(type) \
EX_##type, \
SPRN_SPRG_##type##_SCRATCH, \
PACA_EX##type, \
EX_R10, \
EX_R11
#define EX_PARAMS_TLB \
EX_TLB, \
SPRN_SPRG_GEN_SCRATCH, \
PACA_EXTLB, \
EX_TLB_R10, \
EX_TLB_R11
kvm_handler BOOKE_INTERRUPT_CRITICAL, EX_PARAMS(CRIT), \
SPRN_CSRR0, SPRN_CSRR1, 0
kvm_handler BOOKE_INTERRUPT_MACHINE_CHECK, EX_PARAMS(MC), \
SPRN_MCSRR0, SPRN_MCSRR1, 0
kvm_handler BOOKE_INTERRUPT_DATA_STORAGE, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1,(NEED_EMU | NEED_DEAR | NEED_ESR)
kvm_handler BOOKE_INTERRUPT_INST_STORAGE, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, NEED_ESR
kvm_handler BOOKE_INTERRUPT_EXTERNAL, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_ALIGNMENT, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1,(NEED_DEAR | NEED_ESR)
kvm_handler BOOKE_INTERRUPT_PROGRAM, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1,NEED_ESR
kvm_handler BOOKE_INTERRUPT_FP_UNAVAIL, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_AP_UNAVAIL, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_DECREMENTER, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_FIT, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_WATCHDOG, EX_PARAMS(CRIT),\
SPRN_CSRR0, SPRN_CSRR1, 0
/*
* Only bolted TLB miss exception handlers are supported for now
*/
kvm_handler BOOKE_INTERRUPT_DTLB_MISS, EX_PARAMS_TLB, \
SPRN_SRR0, SPRN_SRR1, (NEED_EMU | NEED_DEAR | NEED_ESR)
kvm_handler BOOKE_INTERRUPT_ITLB_MISS, EX_PARAMS_TLB, \
SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_SPE_UNAVAIL, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_SPE_FP_DATA, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_SPE_FP_ROUND, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_PERFORMANCE_MONITOR, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_DOORBELL, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_DOORBELL_CRITICAL, EX_PARAMS(CRIT), \
SPRN_CSRR0, SPRN_CSRR1, 0
kvm_handler BOOKE_INTERRUPT_HV_PRIV, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, NEED_EMU
kvm_handler BOOKE_INTERRUPT_HV_SYSCALL, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_GUEST_DBELL, EX_PARAMS(GDBELL), \
SPRN_GSRR0, SPRN_GSRR1, 0
kvm_handler BOOKE_INTERRUPT_GUEST_DBELL_CRIT, EX_PARAMS(CRIT), \
SPRN_CSRR0, SPRN_CSRR1, 0
kvm_handler BOOKE_INTERRUPT_DEBUG, EX_PARAMS(DBG), \
SPRN_DSRR0, SPRN_DSRR1, 0
kvm_handler BOOKE_INTERRUPT_DEBUG, EX_PARAMS(CRIT), \
SPRN_CSRR0, SPRN_CSRR1, 0
#else
/*
* For input register values, see arch/powerpc/include/asm/kvm_booke_hv_asm.h
*/
.macro kvm_handler intno srr0, srr1, flags
_GLOBAL(kvmppc_handler_\intno\()_\srr1)
PPC_LL r11, THREAD_KVM_VCPU(r10)
PPC_STL r3, VCPU_GPR(R3)(r11)
mfspr r3, SPRN_SPRG_RSCRATCH0
PPC_STL r4, VCPU_GPR(R4)(r11)
PPC_LL r4, THREAD_NORMSAVE(0)(r10)
PPC_STL r5, VCPU_GPR(R5)(r11)
stw r13, VCPU_CR(r11)
mfspr r5, \srr0
PPC_STL r3, VCPU_GPR(R10)(r11)
PPC_LL r3, THREAD_NORMSAVE(2)(r10)
PPC_STL r6, VCPU_GPR(R6)(r11)
PPC_STL r4, VCPU_GPR(R11)(r11)
mfspr r6, \srr1
PPC_STL r7, VCPU_GPR(R7)(r11)
PPC_STL r8, VCPU_GPR(R8)(r11)
PPC_STL r9, VCPU_GPR(R9)(r11)
PPC_STL r3, VCPU_GPR(R13)(r11)
mfctr r7
PPC_STL r12, VCPU_GPR(R12)(r11)
PPC_STL r7, VCPU_CTR(r11)
mr r4, r11
kvm_handler_common \intno, \srr0, \flags
.endm
.macro kvm_lvl_handler intno scratch srr0, srr1, flags
_GLOBAL(kvmppc_handler_\intno\()_\srr1)
mfspr r10, SPRN_SPRG_THREAD
PPC_LL r11, THREAD_KVM_VCPU(r10)
PPC_STL r3, VCPU_GPR(R3)(r11)
mfspr r3, \scratch
PPC_STL r4, VCPU_GPR(R4)(r11)
PPC_LL r4, GPR9(r8)
PPC_STL r5, VCPU_GPR(R5)(r11)
stw r9, VCPU_CR(r11)
mfspr r5, \srr0
PPC_STL r3, VCPU_GPR(R8)(r11)
PPC_LL r3, GPR10(r8)
PPC_STL r6, VCPU_GPR(R6)(r11)
PPC_STL r4, VCPU_GPR(R9)(r11)
mfspr r6, \srr1
PPC_LL r4, GPR11(r8)
PPC_STL r7, VCPU_GPR(R7)(r11)
PPC_STL r3, VCPU_GPR(R10)(r11)
mfctr r7
PPC_STL r12, VCPU_GPR(R12)(r11)
PPC_STL r13, VCPU_GPR(R13)(r11)
PPC_STL r4, VCPU_GPR(R11)(r11)
PPC_STL r7, VCPU_CTR(r11)
mr r4, r11
kvm_handler_common \intno, \srr0, \flags
.endm
kvm_lvl_handler BOOKE_INTERRUPT_CRITICAL, \
SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, 0
kvm_lvl_handler BOOKE_INTERRUPT_MACHINE_CHECK, \
SPRN_SPRG_RSCRATCH_MC, SPRN_MCSRR0, SPRN_MCSRR1, 0
kvm_handler BOOKE_INTERRUPT_DATA_STORAGE, \
SPRN_SRR0, SPRN_SRR1, (NEED_EMU | NEED_DEAR | NEED_ESR)
kvm_handler BOOKE_INTERRUPT_INST_STORAGE, SPRN_SRR0, SPRN_SRR1, NEED_ESR
kvm_handler BOOKE_INTERRUPT_EXTERNAL, SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_ALIGNMENT, \
SPRN_SRR0, SPRN_SRR1, (NEED_DEAR | NEED_ESR)
kvm_handler BOOKE_INTERRUPT_PROGRAM, SPRN_SRR0, SPRN_SRR1, NEED_ESR
kvm_handler BOOKE_INTERRUPT_FP_UNAVAIL, SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_SYSCALL, SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_AP_UNAVAIL, SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_DECREMENTER, SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_FIT, SPRN_SRR0, SPRN_SRR1, 0
kvm_lvl_handler BOOKE_INTERRUPT_WATCHDOG, \
SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, 0
kvm_handler BOOKE_INTERRUPT_DTLB_MISS, \
SPRN_SRR0, SPRN_SRR1, (NEED_EMU | NEED_DEAR | NEED_ESR)
kvm_handler BOOKE_INTERRUPT_ITLB_MISS, SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_SPE_UNAVAIL, SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_SPE_FP_DATA, SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_SPE_FP_ROUND, SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_PERFORMANCE_MONITOR, SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_DOORBELL, SPRN_SRR0, SPRN_SRR1, 0
kvm_lvl_handler BOOKE_INTERRUPT_DOORBELL_CRITICAL, \
SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, 0
kvm_handler BOOKE_INTERRUPT_HV_PRIV, SPRN_SRR0, SPRN_SRR1, NEED_EMU
kvm_handler BOOKE_INTERRUPT_HV_SYSCALL, SPRN_SRR0, SPRN_SRR1, 0
kvm_handler BOOKE_INTERRUPT_GUEST_DBELL, SPRN_GSRR0, SPRN_GSRR1, 0
kvm_lvl_handler BOOKE_INTERRUPT_GUEST_DBELL_CRIT, \
SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, 0
kvm_lvl_handler BOOKE_INTERRUPT_DEBUG, \
SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, 0
kvm_lvl_handler BOOKE_INTERRUPT_DEBUG, \
SPRN_SPRG_RSCRATCH_DBG, SPRN_DSRR0, SPRN_DSRR1, 0
#endif
/* Registers:
* SPRG_SCRATCH0: guest r10
* r4: vcpu pointer
* r11: vcpu->arch.shared
* r14: KVM exit number
*/
_GLOBAL(kvmppc_resume_host)
/* Save remaining volatile guest register state to vcpu. */
mfspr r3, SPRN_VRSAVE
PPC_STL r0, VCPU_GPR(R0)(r4)
mflr r5
mfspr r6, SPRN_SPRG4
PPC_STL r5, VCPU_LR(r4)
mfspr r7, SPRN_SPRG5
stw r3, VCPU_VRSAVE(r4)
PPC_STD(r6, VCPU_SHARED_SPRG4, r11)
mfspr r8, SPRN_SPRG6
PPC_STD(r7, VCPU_SHARED_SPRG5, r11)
mfspr r9, SPRN_SPRG7
PPC_STD(r8, VCPU_SHARED_SPRG6, r11)
mfxer r3
PPC_STD(r9, VCPU_SHARED_SPRG7, r11)
/* save guest MAS registers and restore host mas4 & mas6 */
mfspr r5, SPRN_MAS0
PPC_STL r3, VCPU_XER(r4)
mfspr r6, SPRN_MAS1
stw r5, VCPU_SHARED_MAS0(r11)
mfspr r7, SPRN_MAS2
stw r6, VCPU_SHARED_MAS1(r11)
PPC_STD(r7, VCPU_SHARED_MAS2, r11)
mfspr r5, SPRN_MAS3
mfspr r6, SPRN_MAS4
stw r5, VCPU_SHARED_MAS7_3+4(r11)
mfspr r7, SPRN_MAS6
stw r6, VCPU_SHARED_MAS4(r11)
mfspr r5, SPRN_MAS7
lwz r6, VCPU_HOST_MAS4(r4)
stw r7, VCPU_SHARED_MAS6(r11)
lwz r8, VCPU_HOST_MAS6(r4)
mtspr SPRN_MAS4, r6
stw r5, VCPU_SHARED_MAS7_3+0(r11)
mtspr SPRN_MAS6, r8
/* Enable MAS register updates via exception */
mfspr r3, SPRN_EPCR
rlwinm r3, r3, 0, ~SPRN_EPCR_DMIUH
mtspr SPRN_EPCR, r3
isync
/* Switch to kernel stack and jump to handler. */
PPC_LL r3, HOST_RUN(r1)
mr r5, r14 /* intno */
mr r14, r4 /* Save vcpu pointer. */
bl kvmppc_handle_exit
/* Restore vcpu pointer and the nonvolatiles we used. */
mr r4, r14
PPC_LL r14, VCPU_GPR(R14)(r4)
andi. r5, r3, RESUME_FLAG_NV
beq skip_nv_load
PPC_LL r15, VCPU_GPR(R15)(r4)
PPC_LL r16, VCPU_GPR(R16)(r4)
PPC_LL r17, VCPU_GPR(R17)(r4)
PPC_LL r18, VCPU_GPR(R18)(r4)
PPC_LL r19, VCPU_GPR(R19)(r4)
PPC_LL r20, VCPU_GPR(R20)(r4)
PPC_LL r21, VCPU_GPR(R21)(r4)
PPC_LL r22, VCPU_GPR(R22)(r4)
PPC_LL r23, VCPU_GPR(R23)(r4)
PPC_LL r24, VCPU_GPR(R24)(r4)
PPC_LL r25, VCPU_GPR(R25)(r4)
PPC_LL r26, VCPU_GPR(R26)(r4)
PPC_LL r27, VCPU_GPR(R27)(r4)
PPC_LL r28, VCPU_GPR(R28)(r4)
PPC_LL r29, VCPU_GPR(R29)(r4)
PPC_LL r30, VCPU_GPR(R30)(r4)
PPC_LL r31, VCPU_GPR(R31)(r4)
skip_nv_load:
/* Should we return to the guest? */
andi. r5, r3, RESUME_FLAG_HOST
beq lightweight_exit
srawi r3, r3, 2 /* Shift -ERR back down. */
heavyweight_exit:
/* Not returning to guest. */
PPC_LL r5, HOST_STACK_LR(r1)
lwz r6, HOST_CR(r1)
/*
* We already saved guest volatile register state; now save the
* non-volatiles.
*/
PPC_STL r15, VCPU_GPR(R15)(r4)
PPC_STL r16, VCPU_GPR(R16)(r4)
PPC_STL r17, VCPU_GPR(R17)(r4)
PPC_STL r18, VCPU_GPR(R18)(r4)
PPC_STL r19, VCPU_GPR(R19)(r4)
PPC_STL r20, VCPU_GPR(R20)(r4)
PPC_STL r21, VCPU_GPR(R21)(r4)
PPC_STL r22, VCPU_GPR(R22)(r4)
PPC_STL r23, VCPU_GPR(R23)(r4)
PPC_STL r24, VCPU_GPR(R24)(r4)
PPC_STL r25, VCPU_GPR(R25)(r4)
PPC_STL r26, VCPU_GPR(R26)(r4)
PPC_STL r27, VCPU_GPR(R27)(r4)
PPC_STL r28, VCPU_GPR(R28)(r4)
PPC_STL r29, VCPU_GPR(R29)(r4)
PPC_STL r30, VCPU_GPR(R30)(r4)
PPC_STL r31, VCPU_GPR(R31)(r4)
/* Load host non-volatile register state from host stack. */
PPC_LL r14, HOST_NV_GPR(R14)(r1)
PPC_LL r15, HOST_NV_GPR(R15)(r1)
PPC_LL r16, HOST_NV_GPR(R16)(r1)
PPC_LL r17, HOST_NV_GPR(R17)(r1)
PPC_LL r18, HOST_NV_GPR(R18)(r1)
PPC_LL r19, HOST_NV_GPR(R19)(r1)
PPC_LL r20, HOST_NV_GPR(R20)(r1)
PPC_LL r21, HOST_NV_GPR(R21)(r1)
PPC_LL r22, HOST_NV_GPR(R22)(r1)
PPC_LL r23, HOST_NV_GPR(R23)(r1)
PPC_LL r24, HOST_NV_GPR(R24)(r1)
PPC_LL r25, HOST_NV_GPR(R25)(r1)
PPC_LL r26, HOST_NV_GPR(R26)(r1)
PPC_LL r27, HOST_NV_GPR(R27)(r1)
PPC_LL r28, HOST_NV_GPR(R28)(r1)
PPC_LL r29, HOST_NV_GPR(R29)(r1)
PPC_LL r30, HOST_NV_GPR(R30)(r1)
PPC_LL r31, HOST_NV_GPR(R31)(r1)
/* Return to kvm_vcpu_run(). */
mtlr r5
mtcr r6
addi r1, r1, HOST_STACK_SIZE
/* r3 still contains the return code from kvmppc_handle_exit(). */
blr
/* Registers:
* r3: kvm_run pointer
* r4: vcpu pointer
*/
_GLOBAL(__kvmppc_vcpu_run)
stwu r1, -HOST_STACK_SIZE(r1)
PPC_STL r1, VCPU_HOST_STACK(r4) /* Save stack pointer to vcpu. */
/* Save host state to stack. */
PPC_STL r3, HOST_RUN(r1)
mflr r3
mfcr r5
PPC_STL r3, HOST_STACK_LR(r1)
stw r5, HOST_CR(r1)
/* Save host non-volatile register state to stack. */
PPC_STL r14, HOST_NV_GPR(R14)(r1)
PPC_STL r15, HOST_NV_GPR(R15)(r1)
PPC_STL r16, HOST_NV_GPR(R16)(r1)
PPC_STL r17, HOST_NV_GPR(R17)(r1)
PPC_STL r18, HOST_NV_GPR(R18)(r1)
PPC_STL r19, HOST_NV_GPR(R19)(r1)
PPC_STL r20, HOST_NV_GPR(R20)(r1)
PPC_STL r21, HOST_NV_GPR(R21)(r1)
PPC_STL r22, HOST_NV_GPR(R22)(r1)
PPC_STL r23, HOST_NV_GPR(R23)(r1)
PPC_STL r24, HOST_NV_GPR(R24)(r1)
PPC_STL r25, HOST_NV_GPR(R25)(r1)
PPC_STL r26, HOST_NV_GPR(R26)(r1)
PPC_STL r27, HOST_NV_GPR(R27)(r1)
PPC_STL r28, HOST_NV_GPR(R28)(r1)
PPC_STL r29, HOST_NV_GPR(R29)(r1)
PPC_STL r30, HOST_NV_GPR(R30)(r1)
PPC_STL r31, HOST_NV_GPR(R31)(r1)
/* Load guest non-volatiles. */
PPC_LL r14, VCPU_GPR(R14)(r4)
PPC_LL r15, VCPU_GPR(R15)(r4)
PPC_LL r16, VCPU_GPR(R16)(r4)
PPC_LL r17, VCPU_GPR(R17)(r4)
PPC_LL r18, VCPU_GPR(R18)(r4)
PPC_LL r19, VCPU_GPR(R19)(r4)
PPC_LL r20, VCPU_GPR(R20)(r4)
PPC_LL r21, VCPU_GPR(R21)(r4)
PPC_LL r22, VCPU_GPR(R22)(r4)
PPC_LL r23, VCPU_GPR(R23)(r4)
PPC_LL r24, VCPU_GPR(R24)(r4)
PPC_LL r25, VCPU_GPR(R25)(r4)
PPC_LL r26, VCPU_GPR(R26)(r4)
PPC_LL r27, VCPU_GPR(R27)(r4)
PPC_LL r28, VCPU_GPR(R28)(r4)
PPC_LL r29, VCPU_GPR(R29)(r4)
PPC_LL r30, VCPU_GPR(R30)(r4)
PPC_LL r31, VCPU_GPR(R31)(r4)
lightweight_exit:
PPC_STL r2, HOST_R2(r1)
mfspr r3, SPRN_PID
stw r3, VCPU_HOST_PID(r4)
lwz r3, VCPU_GUEST_PID(r4)
mtspr SPRN_PID, r3
PPC_LL r11, VCPU_SHARED(r4)
/* Disable MAS register updates via exception */
mfspr r3, SPRN_EPCR
oris r3, r3, SPRN_EPCR_DMIUH@h
mtspr SPRN_EPCR, r3
isync
/* Save host mas4 and mas6 and load guest MAS registers */
mfspr r3, SPRN_MAS4
stw r3, VCPU_HOST_MAS4(r4)
mfspr r3, SPRN_MAS6
stw r3, VCPU_HOST_MAS6(r4)
lwz r3, VCPU_SHARED_MAS0(r11)
lwz r5, VCPU_SHARED_MAS1(r11)
PPC_LD(r6, VCPU_SHARED_MAS2, r11)
lwz r7, VCPU_SHARED_MAS7_3+4(r11)
lwz r8, VCPU_SHARED_MAS4(r11)
mtspr SPRN_MAS0, r3
mtspr SPRN_MAS1, r5
mtspr SPRN_MAS2, r6
mtspr SPRN_MAS3, r7
mtspr SPRN_MAS4, r8
lwz r3, VCPU_SHARED_MAS6(r11)
lwz r5, VCPU_SHARED_MAS7_3+0(r11)
mtspr SPRN_MAS6, r3
mtspr SPRN_MAS7, r5
/*
* Host interrupt handlers may have clobbered these guest-readable
* SPRGs, so we need to reload them here with the guest's values.
*/
lwz r3, VCPU_VRSAVE(r4)
PPC_LD(r5, VCPU_SHARED_SPRG4, r11)
mtspr SPRN_VRSAVE, r3
PPC_LD(r6, VCPU_SHARED_SPRG5, r11)
mtspr SPRN_SPRG4W, r5
PPC_LD(r7, VCPU_SHARED_SPRG6, r11)
mtspr SPRN_SPRG5W, r6
PPC_LD(r8, VCPU_SHARED_SPRG7, r11)
mtspr SPRN_SPRG6W, r7
mtspr SPRN_SPRG7W, r8
/* Load some guest volatiles. */
PPC_LL r3, VCPU_LR(r4)
PPC_LL r5, VCPU_XER(r4)
PPC_LL r6, VCPU_CTR(r4)
lwz r7, VCPU_CR(r4)
PPC_LL r8, VCPU_PC(r4)
PPC_LD(r9, VCPU_SHARED_MSR, r11)
PPC_LL r0, VCPU_GPR(R0)(r4)
PPC_LL r1, VCPU_GPR(R1)(r4)
PPC_LL r2, VCPU_GPR(R2)(r4)
PPC_LL r10, VCPU_GPR(R10)(r4)
PPC_LL r11, VCPU_GPR(R11)(r4)
PPC_LL r12, VCPU_GPR(R12)(r4)
PPC_LL r13, VCPU_GPR(R13)(r4)
mtlr r3
mtxer r5
mtctr r6
mtsrr0 r8
mtsrr1 r9
#ifdef CONFIG_KVM_EXIT_TIMING
/* save enter time */
1:
mfspr r6, SPRN_TBRU
mfspr r9, SPRN_TBRL
mfspr r8, SPRN_TBRU
cmpw r8, r6
stw r9, VCPU_TIMING_LAST_ENTER_TBL(r4)
bne 1b
stw r8, VCPU_TIMING_LAST_ENTER_TBU(r4)
#endif
/*
* Don't execute any instruction which can change CR after
* below instruction.
*/
mtcr r7
/* Finish loading guest volatiles and jump to guest. */
PPC_LL r5, VCPU_GPR(R5)(r4)
PPC_LL r6, VCPU_GPR(R6)(r4)
PPC_LL r7, VCPU_GPR(R7)(r4)
PPC_LL r8, VCPU_GPR(R8)(r4)
PPC_LL r9, VCPU_GPR(R9)(r4)
PPC_LL r3, VCPU_GPR(R3)(r4)
PPC_LL r4, VCPU_GPR(R4)(r4)
rfi
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