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linux-pinenote/arch/powerpc/kvm/bookehv_interrupts.S
Linus Torvalds e2a0f813e0 Second batch of KVM updates. Some minor x86 fixes, 
two s390 guest features that need some handling in the host,
 and all the PPC changes.  The PPC changes include support for
 little-endian guests and enablement for new POWER8 features.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull more KVM updates from Paolo Bonzini:
 "Second batch of KVM updates.  Some minor x86 fixes, two s390 guest
  features that need some handling in the host, and all the PPC changes.

  The PPC changes include support for little-endian guests and
  enablement for new POWER8 features"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (45 commits)
  x86, kvm: correctly access the KVM_CPUID_FEATURES leaf at 0x40000101
  x86, kvm: cache the base of the KVM cpuid leaves
  kvm: x86: move KVM_CAP_HYPERV_TIME outside #ifdef
  KVM: PPC: Book3S PR: Cope with doorbell interrupts
  KVM: PPC: Book3S HV: Add software abort codes for transactional memory
  KVM: PPC: Book3S HV: Add new state for transactional memory
  powerpc/Kconfig: Make TM select VSX and VMX
  KVM: PPC: Book3S HV: Basic little-endian guest support
  KVM: PPC: Book3S HV: Add support for DABRX register on POWER7
  KVM: PPC: Book3S HV: Prepare for host using hypervisor doorbells
  KVM: PPC: Book3S HV: Handle new LPCR bits on POWER8
  KVM: PPC: Book3S HV: Handle guest using doorbells for IPIs
  KVM: PPC: Book3S HV: Consolidate code that checks reason for wake from nap
  KVM: PPC: Book3S HV: Implement architecture compatibility modes for POWER8
  KVM: PPC: Book3S HV: Add handler for HV facility unavailable
  KVM: PPC: Book3S HV: Flush the correct number of TLB sets on POWER8
  KVM: PPC: Book3S HV: Context-switch new POWER8 SPRs
  KVM: PPC: Book3S HV: Align physical and virtual CPU thread numbers
  KVM: PPC: Book3S HV: Don't set DABR on POWER8
  kvm/ppc: IRQ disabling cleanup
  ...
2014-01-31 08:37:32 -08:00

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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>
#include <asm/hw_irq.h>
#include <asm/irqflags.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
kvm_handler BOOKE_INTERRUPT_LRAT_ERROR, EX_PARAMS(GEN), \
SPRN_SRR0, SPRN_SRR1, (NEED_EMU | NEED_DEAR | NEED_ESR)
#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
#ifdef CONFIG_64BIT
/*
* We enter with interrupts disabled in hardware, but
* we need to call RECONCILE_IRQ_STATE to ensure
* that the software state is kept in sync.
*/
RECONCILE_IRQ_STATE(r3,r5)
#endif
/* 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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