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kernel-fxtec-pro1x/arch/powerpc/kvm/book3s_hv_rmhandlers.S
Paul Mackerras 697d3899dc KVM: PPC: Implement MMIO emulation support for Book3S HV guests 
This provides the low-level support for MMIO emulation in Book3S HV
guests.  When the guest tries to map a page which is not covered by
any memslot, that page is taken to be an MMIO emulation page.  Instead
of inserting a valid HPTE, we insert an HPTE that has the valid bit
clear but another hypervisor software-use bit set, which we call
HPTE_V_ABSENT, to indicate that this is an absent page.  An
absent page is treated much like a valid page as far as guest hcalls
(H_ENTER, H_REMOVE, H_READ etc.) are concerned, except of course that
an absent HPTE doesn't need to be invalidated with tlbie since it
was never valid as far as the hardware is concerned.

When the guest accesses a page for which there is an absent HPTE, it
will take a hypervisor data storage interrupt (HDSI) since we now set
the VPM1 bit in the LPCR.  Our HDSI handler for HPTE-not-present faults
looks up the hash table and if it finds an absent HPTE mapping the
requested virtual address, will switch to kernel mode and handle the
fault in kvmppc_book3s_hv_page_fault(), which at present just calls
kvmppc_hv_emulate_mmio() to set up the MMIO emulation.

This is based on an earlier patch by Benjamin Herrenschmidt, but since
heavily reworked.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
2012-03-05 14:52:37 +02:00

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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.
*
* Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
*
* Derived from book3s_rmhandlers.S and other files, which are:
*
* Copyright SUSE Linux Products GmbH 2009
*
* Authors: Alexander Graf <agraf@suse.de>
*/
#include <asm/ppc_asm.h>
#include <asm/kvm_asm.h>
#include <asm/reg.h>
#include <asm/mmu.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/hvcall.h>
#include <asm/asm-offsets.h>
#include <asm/exception-64s.h>
/*****************************************************************************
* *
* Real Mode handlers that need to be in the linear mapping *
* *
****************************************************************************/
.globl kvmppc_skip_interrupt
kvmppc_skip_interrupt:
mfspr r13,SPRN_SRR0
addi r13,r13,4
mtspr SPRN_SRR0,r13
GET_SCRATCH0(r13)
rfid
b .
.globl kvmppc_skip_Hinterrupt
kvmppc_skip_Hinterrupt:
mfspr r13,SPRN_HSRR0
addi r13,r13,4
mtspr SPRN_HSRR0,r13
GET_SCRATCH0(r13)
hrfid
b .
/*
* Call kvmppc_hv_entry in real mode.
* Must be called with interrupts hard-disabled.
*
* Input Registers:
*
* LR = return address to continue at after eventually re-enabling MMU
*/
_GLOBAL(kvmppc_hv_entry_trampoline)
mfmsr r10
LOAD_REG_ADDR(r5, kvmppc_hv_entry)
li r0,MSR_RI
andc r0,r10,r0
li r6,MSR_IR | MSR_DR
andc r6,r10,r6
mtmsrd r0,1 /* clear RI in MSR */
mtsrr0 r5
mtsrr1 r6
RFI
#define ULONG_SIZE 8
#define VCPU_GPR(n) (VCPU_GPRS + (n * ULONG_SIZE))
/******************************************************************************
* *
* Entry code *
* *
*****************************************************************************/
#define XICS_XIRR 4
#define XICS_QIRR 0xc
/*
* We come in here when wakened from nap mode on a secondary hw thread.
* Relocation is off and most register values are lost.
* r13 points to the PACA.
*/
.globl kvm_start_guest
kvm_start_guest:
ld r1,PACAEMERGSP(r13)
subi r1,r1,STACK_FRAME_OVERHEAD
ld r2,PACATOC(r13)
/* were we napping due to cede? */
lbz r0,HSTATE_NAPPING(r13)
cmpwi r0,0
bne kvm_end_cede
/* get vcpu pointer */
ld r4, HSTATE_KVM_VCPU(r13)
/* We got here with an IPI; clear it */
ld r5, HSTATE_XICS_PHYS(r13)
li r0, 0xff
li r6, XICS_QIRR
li r7, XICS_XIRR
lwzcix r8, r5, r7 /* ack the interrupt */
sync
stbcix r0, r5, r6 /* clear it */
stwcix r8, r5, r7 /* EOI it */
/* NV GPR values from power7_idle() will no longer be valid */
stb r0, PACA_NAPSTATELOST(r13)
.global kvmppc_hv_entry
kvmppc_hv_entry:
/* Required state:
*
* R4 = vcpu pointer
* MSR = ~IR|DR
* R13 = PACA
* R1 = host R1
* all other volatile GPRS = free
*/
mflr r0
std r0, HSTATE_VMHANDLER(r13)
ld r14, VCPU_GPR(r14)(r4)
ld r15, VCPU_GPR(r15)(r4)
ld r16, VCPU_GPR(r16)(r4)
ld r17, VCPU_GPR(r17)(r4)
ld r18, VCPU_GPR(r18)(r4)
ld r19, VCPU_GPR(r19)(r4)
ld r20, VCPU_GPR(r20)(r4)
ld r21, VCPU_GPR(r21)(r4)
ld r22, VCPU_GPR(r22)(r4)
ld r23, VCPU_GPR(r23)(r4)
ld r24, VCPU_GPR(r24)(r4)
ld r25, VCPU_GPR(r25)(r4)
ld r26, VCPU_GPR(r26)(r4)
ld r27, VCPU_GPR(r27)(r4)
ld r28, VCPU_GPR(r28)(r4)
ld r29, VCPU_GPR(r29)(r4)
ld r30, VCPU_GPR(r30)(r4)
ld r31, VCPU_GPR(r31)(r4)
/* Load guest PMU registers */
/* R4 is live here (vcpu pointer) */
li r3, 1
sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */
mtspr SPRN_MMCR0, r3 /* freeze all counters, disable ints */
isync
lwz r3, VCPU_PMC(r4) /* always load up guest PMU registers */
lwz r5, VCPU_PMC + 4(r4) /* to prevent information leak */
lwz r6, VCPU_PMC + 8(r4)
lwz r7, VCPU_PMC + 12(r4)
lwz r8, VCPU_PMC + 16(r4)
lwz r9, VCPU_PMC + 20(r4)
BEGIN_FTR_SECTION
lwz r10, VCPU_PMC + 24(r4)
lwz r11, VCPU_PMC + 28(r4)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
mtspr SPRN_PMC1, r3
mtspr SPRN_PMC2, r5
mtspr SPRN_PMC3, r6
mtspr SPRN_PMC4, r7
mtspr SPRN_PMC5, r8
mtspr SPRN_PMC6, r9
BEGIN_FTR_SECTION
mtspr SPRN_PMC7, r10
mtspr SPRN_PMC8, r11
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
ld r3, VCPU_MMCR(r4)
ld r5, VCPU_MMCR + 8(r4)
ld r6, VCPU_MMCR + 16(r4)
mtspr SPRN_MMCR1, r5
mtspr SPRN_MMCRA, r6
mtspr SPRN_MMCR0, r3
isync
/* Load up FP, VMX and VSX registers */
bl kvmppc_load_fp
BEGIN_FTR_SECTION
/* Switch DSCR to guest value */
ld r5, VCPU_DSCR(r4)
mtspr SPRN_DSCR, r5
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
/*
* Set the decrementer to the guest decrementer.
*/
ld r8,VCPU_DEC_EXPIRES(r4)
mftb r7
subf r3,r7,r8
mtspr SPRN_DEC,r3
stw r3,VCPU_DEC(r4)
ld r5, VCPU_SPRG0(r4)
ld r6, VCPU_SPRG1(r4)
ld r7, VCPU_SPRG2(r4)
ld r8, VCPU_SPRG3(r4)
mtspr SPRN_SPRG0, r5
mtspr SPRN_SPRG1, r6
mtspr SPRN_SPRG2, r7
mtspr SPRN_SPRG3, r8
/* Save R1 in the PACA */
std r1, HSTATE_HOST_R1(r13)
/* Increment yield count if they have a VPA */
ld r3, VCPU_VPA(r4)
cmpdi r3, 0
beq 25f
lwz r5, LPPACA_YIELDCOUNT(r3)
addi r5, r5, 1
stw r5, LPPACA_YIELDCOUNT(r3)
25:
/* Load up DAR and DSISR */
ld r5, VCPU_DAR(r4)
lwz r6, VCPU_DSISR(r4)
mtspr SPRN_DAR, r5
mtspr SPRN_DSISR, r6
/* Set partition DABR */
li r5,3
ld r6,VCPU_DABR(r4)
mtspr SPRN_DABRX,r5
mtspr SPRN_DABR,r6
BEGIN_FTR_SECTION
/* Restore AMR and UAMOR, set AMOR to all 1s */
ld r5,VCPU_AMR(r4)
ld r6,VCPU_UAMOR(r4)
li r7,-1
mtspr SPRN_AMR,r5
mtspr SPRN_UAMOR,r6
mtspr SPRN_AMOR,r7
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
/* Clear out SLB */
li r6,0
slbmte r6,r6
slbia
ptesync
BEGIN_FTR_SECTION
b 30f
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
/*
* POWER7 host -> guest partition switch code.
* We don't have to lock against concurrent tlbies,
* but we do have to coordinate across hardware threads.
*/
/* Increment entry count iff exit count is zero. */
ld r5,HSTATE_KVM_VCORE(r13)
addi r9,r5,VCORE_ENTRY_EXIT
21: lwarx r3,0,r9
cmpwi r3,0x100 /* any threads starting to exit? */
bge secondary_too_late /* if so we're too late to the party */
addi r3,r3,1
stwcx. r3,0,r9
bne 21b
/* Primary thread switches to guest partition. */
ld r9,VCPU_KVM(r4) /* pointer to struct kvm */
lwz r6,VCPU_PTID(r4)
cmpwi r6,0
bne 20f
ld r6,KVM_SDR1(r9)
lwz r7,KVM_LPID(r9)
li r0,LPID_RSVD /* switch to reserved LPID */
mtspr SPRN_LPID,r0
ptesync
mtspr SPRN_SDR1,r6 /* switch to partition page table */
mtspr SPRN_LPID,r7
isync
li r0,1
stb r0,VCORE_IN_GUEST(r5) /* signal secondaries to continue */
b 10f
/* Secondary threads wait for primary to have done partition switch */
20: lbz r0,VCORE_IN_GUEST(r5)
cmpwi r0,0
beq 20b
/* Set LPCR and RMOR. */
10: ld r8,KVM_LPCR(r9)
mtspr SPRN_LPCR,r8
ld r8,KVM_RMOR(r9)
mtspr SPRN_RMOR,r8
isync
/* Check if HDEC expires soon */
mfspr r3,SPRN_HDEC
cmpwi r3,10
li r12,BOOK3S_INTERRUPT_HV_DECREMENTER
mr r9,r4
blt hdec_soon
/*
* Invalidate the TLB if we could possibly have stale TLB
* entries for this partition on this core due to the use
* of tlbiel.
* XXX maybe only need this on primary thread?
*/
ld r9,VCPU_KVM(r4) /* pointer to struct kvm */
lwz r5,VCPU_VCPUID(r4)
lhz r6,PACAPACAINDEX(r13)
rldimi r6,r5,0,62 /* XXX map as if threads 1:1 p:v */
lhz r8,VCPU_LAST_CPU(r4)
sldi r7,r6,1 /* see if this is the same vcpu */
add r7,r7,r9 /* as last ran on this pcpu */
lhz r0,KVM_LAST_VCPU(r7)
cmpw r6,r8 /* on the same cpu core as last time? */
bne 3f
cmpw r0,r5 /* same vcpu as this core last ran? */
beq 1f
3: sth r6,VCPU_LAST_CPU(r4) /* if not, invalidate partition TLB */
sth r5,KVM_LAST_VCPU(r7)
li r6,128
mtctr r6
li r7,0x800 /* IS field = 0b10 */
ptesync
2: tlbiel r7
addi r7,r7,0x1000
bdnz 2b
ptesync
1:
/* Save purr/spurr */
mfspr r5,SPRN_PURR
mfspr r6,SPRN_SPURR
std r5,HSTATE_PURR(r13)
std r6,HSTATE_SPURR(r13)
ld r7,VCPU_PURR(r4)
ld r8,VCPU_SPURR(r4)
mtspr SPRN_PURR,r7
mtspr SPRN_SPURR,r8
b 31f
/*
* PPC970 host -> guest partition switch code.
* We have to lock against concurrent tlbies,
* using native_tlbie_lock to lock against host tlbies
* and kvm->arch.tlbie_lock to lock against guest tlbies.
* We also have to invalidate the TLB since its
* entries aren't tagged with the LPID.
*/
30: ld r9,VCPU_KVM(r4) /* pointer to struct kvm */
/* first take native_tlbie_lock */
.section ".toc","aw"
toc_tlbie_lock:
.tc native_tlbie_lock[TC],native_tlbie_lock
.previous
ld r3,toc_tlbie_lock@toc(2)
lwz r8,PACA_LOCK_TOKEN(r13)
24: lwarx r0,0,r3
cmpwi r0,0
bne 24b
stwcx. r8,0,r3
bne 24b
isync
ld r7,KVM_LPCR(r9) /* use kvm->arch.lpcr to store HID4 */
li r0,0x18f
rotldi r0,r0,HID4_LPID5_SH /* all lpid bits in HID4 = 1 */
or r0,r7,r0
ptesync
sync
mtspr SPRN_HID4,r0 /* switch to reserved LPID */
isync
li r0,0
stw r0,0(r3) /* drop native_tlbie_lock */
/* invalidate the whole TLB */
li r0,256
mtctr r0
li r6,0
25: tlbiel r6
addi r6,r6,0x1000
bdnz 25b
ptesync
/* Take the guest's tlbie_lock */
addi r3,r9,KVM_TLBIE_LOCK
24: lwarx r0,0,r3
cmpwi r0,0
bne 24b
stwcx. r8,0,r3
bne 24b
isync
ld r6,KVM_SDR1(r9)
mtspr SPRN_SDR1,r6 /* switch to partition page table */
/* Set up HID4 with the guest's LPID etc. */
sync
mtspr SPRN_HID4,r7
isync
/* drop the guest's tlbie_lock */
li r0,0
stw r0,0(r3)
/* Check if HDEC expires soon */
mfspr r3,SPRN_HDEC
cmpwi r3,10
li r12,BOOK3S_INTERRUPT_HV_DECREMENTER
mr r9,r4
blt hdec_soon
/* Enable HDEC interrupts */
mfspr r0,SPRN_HID0
li r3,1
rldimi r0,r3, HID0_HDICE_SH, 64-HID0_HDICE_SH-1
sync
mtspr SPRN_HID0,r0
mfspr r0,SPRN_HID0
mfspr r0,SPRN_HID0
mfspr r0,SPRN_HID0
mfspr r0,SPRN_HID0
mfspr r0,SPRN_HID0
mfspr r0,SPRN_HID0
/* Load up guest SLB entries */
31: lwz r5,VCPU_SLB_MAX(r4)
cmpwi r5,0
beq 9f
mtctr r5
addi r6,r4,VCPU_SLB
1: ld r8,VCPU_SLB_E(r6)
ld r9,VCPU_SLB_V(r6)
slbmte r9,r8
addi r6,r6,VCPU_SLB_SIZE
bdnz 1b
9:
/* Restore state of CTRL run bit; assume 1 on entry */
lwz r5,VCPU_CTRL(r4)
andi. r5,r5,1
bne 4f
mfspr r6,SPRN_CTRLF
clrrdi r6,r6,1
mtspr SPRN_CTRLT,r6
4:
ld r6, VCPU_CTR(r4)
lwz r7, VCPU_XER(r4)
mtctr r6
mtxer r7
kvmppc_cede_reentry: /* r4 = vcpu, r13 = paca */
ld r6, VCPU_SRR0(r4)
ld r7, VCPU_SRR1(r4)
ld r10, VCPU_PC(r4)
ld r11, VCPU_MSR(r4) /* r11 = vcpu->arch.msr & ~MSR_HV */
rldicl r11, r11, 63 - MSR_HV_LG, 1
rotldi r11, r11, 1 + MSR_HV_LG
ori r11, r11, MSR_ME
/* Check if we can deliver an external or decrementer interrupt now */
ld r0,VCPU_PENDING_EXC(r4)
li r8,(1 << BOOK3S_IRQPRIO_EXTERNAL)
oris r8,r8,(1 << BOOK3S_IRQPRIO_EXTERNAL_LEVEL)@h
and r0,r0,r8
cmpdi cr1,r0,0
andi. r0,r11,MSR_EE
beq cr1,11f
BEGIN_FTR_SECTION
mfspr r8,SPRN_LPCR
ori r8,r8,LPCR_MER
mtspr SPRN_LPCR,r8
isync
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
beq 5f
li r0,BOOK3S_INTERRUPT_EXTERNAL
12: mr r6,r10
mr r10,r0
mr r7,r11
li r11,(MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */
rotldi r11,r11,63
b 5f
11: beq 5f
mfspr r0,SPRN_DEC
cmpwi r0,0
li r0,BOOK3S_INTERRUPT_DECREMENTER
blt 12b
/* Move SRR0 and SRR1 into the respective regs */
5: mtspr SPRN_SRR0, r6
mtspr SPRN_SRR1, r7
li r0,0
stb r0,VCPU_CEDED(r4) /* cancel cede */
fast_guest_return:
mtspr SPRN_HSRR0,r10
mtspr SPRN_HSRR1,r11
/* Activate guest mode, so faults get handled by KVM */
li r9, KVM_GUEST_MODE_GUEST
stb r9, HSTATE_IN_GUEST(r13)
/* Enter guest */
ld r5, VCPU_LR(r4)
lwz r6, VCPU_CR(r4)
mtlr r5
mtcr r6
ld r0, VCPU_GPR(r0)(r4)
ld r1, VCPU_GPR(r1)(r4)
ld r2, VCPU_GPR(r2)(r4)
ld r3, VCPU_GPR(r3)(r4)
ld r5, VCPU_GPR(r5)(r4)
ld r6, VCPU_GPR(r6)(r4)
ld r7, VCPU_GPR(r7)(r4)
ld r8, VCPU_GPR(r8)(r4)
ld r9, VCPU_GPR(r9)(r4)
ld r10, VCPU_GPR(r10)(r4)
ld r11, VCPU_GPR(r11)(r4)
ld r12, VCPU_GPR(r12)(r4)
ld r13, VCPU_GPR(r13)(r4)
ld r4, VCPU_GPR(r4)(r4)
hrfid
b .
/******************************************************************************
* *
* Exit code *
* *
*****************************************************************************/
/*
* We come here from the first-level interrupt handlers.
*/
.globl kvmppc_interrupt
kvmppc_interrupt:
/*
* Register contents:
* R12 = interrupt vector
* R13 = PACA
* guest CR, R12 saved in shadow VCPU SCRATCH1/0
* guest R13 saved in SPRN_SCRATCH0
*/
/* abuse host_r2 as third scratch area; we get r2 from PACATOC(r13) */
std r9, HSTATE_HOST_R2(r13)
ld r9, HSTATE_KVM_VCPU(r13)
/* Save registers */
std r0, VCPU_GPR(r0)(r9)
std r1, VCPU_GPR(r1)(r9)
std r2, VCPU_GPR(r2)(r9)
std r3, VCPU_GPR(r3)(r9)
std r4, VCPU_GPR(r4)(r9)
std r5, VCPU_GPR(r5)(r9)
std r6, VCPU_GPR(r6)(r9)
std r7, VCPU_GPR(r7)(r9)
std r8, VCPU_GPR(r8)(r9)
ld r0, HSTATE_HOST_R2(r13)
std r0, VCPU_GPR(r9)(r9)
std r10, VCPU_GPR(r10)(r9)
std r11, VCPU_GPR(r11)(r9)
ld r3, HSTATE_SCRATCH0(r13)
lwz r4, HSTATE_SCRATCH1(r13)
std r3, VCPU_GPR(r12)(r9)
stw r4, VCPU_CR(r9)
/* Restore R1/R2 so we can handle faults */
ld r1, HSTATE_HOST_R1(r13)
ld r2, PACATOC(r13)
mfspr r10, SPRN_SRR0
mfspr r11, SPRN_SRR1
std r10, VCPU_SRR0(r9)
std r11, VCPU_SRR1(r9)
andi. r0, r12, 2 /* need to read HSRR0/1? */
beq 1f
mfspr r10, SPRN_HSRR0
mfspr r11, SPRN_HSRR1
clrrdi r12, r12, 2
1: std r10, VCPU_PC(r9)
std r11, VCPU_MSR(r9)
GET_SCRATCH0(r3)
mflr r4
std r3, VCPU_GPR(r13)(r9)
std r4, VCPU_LR(r9)
/* Unset guest mode */
li r0, KVM_GUEST_MODE_NONE
stb r0, HSTATE_IN_GUEST(r13)
stw r12,VCPU_TRAP(r9)
/* Save HEIR (HV emulation assist reg) in last_inst
if this is an HEI (HV emulation interrupt, e40) */
li r3,KVM_INST_FETCH_FAILED
BEGIN_FTR_SECTION
cmpwi r12,BOOK3S_INTERRUPT_H_EMUL_ASSIST
bne 11f
mfspr r3,SPRN_HEIR
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
11: stw r3,VCPU_LAST_INST(r9)
/* these are volatile across C function calls */
mfctr r3
mfxer r4
std r3, VCPU_CTR(r9)
stw r4, VCPU_XER(r9)
BEGIN_FTR_SECTION
/* If this is a page table miss then see if it's theirs or ours */
cmpwi r12, BOOK3S_INTERRUPT_H_DATA_STORAGE
beq kvmppc_hdsi
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
/* See if this is a leftover HDEC interrupt */
cmpwi r12,BOOK3S_INTERRUPT_HV_DECREMENTER
bne 2f
mfspr r3,SPRN_HDEC
cmpwi r3,0
bge ignore_hdec
2:
/* See if this is an hcall we can handle in real mode */
cmpwi r12,BOOK3S_INTERRUPT_SYSCALL
beq hcall_try_real_mode
/* Check for mediated interrupts (could be done earlier really ...) */
BEGIN_FTR_SECTION
cmpwi r12,BOOK3S_INTERRUPT_EXTERNAL
bne+ 1f
andi. r0,r11,MSR_EE
beq 1f
mfspr r5,SPRN_LPCR
andi. r0,r5,LPCR_MER
bne bounce_ext_interrupt
1:
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
nohpte_cont:
hcall_real_cont: /* r9 = vcpu, r12 = trap, r13 = paca */
/* Save DEC */
mfspr r5,SPRN_DEC
mftb r6
extsw r5,r5
add r5,r5,r6
std r5,VCPU_DEC_EXPIRES(r9)
/* Save more register state */
mfdar r6
mfdsisr r7
std r6, VCPU_DAR(r9)
stw r7, VCPU_DSISR(r9)
BEGIN_FTR_SECTION
/* don't overwrite fault_dar/fault_dsisr if HDSI */
cmpwi r12,BOOK3S_INTERRUPT_H_DATA_STORAGE
beq 6f
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
std r6, VCPU_FAULT_DAR(r9)
stw r7, VCPU_FAULT_DSISR(r9)
/* Save guest CTRL register, set runlatch to 1 */
6: mfspr r6,SPRN_CTRLF
stw r6,VCPU_CTRL(r9)
andi. r0,r6,1
bne 4f
ori r6,r6,1
mtspr SPRN_CTRLT,r6
4:
/* Read the guest SLB and save it away */
lwz r0,VCPU_SLB_NR(r9) /* number of entries in SLB */
mtctr r0
li r6,0
addi r7,r9,VCPU_SLB
li r5,0
1: slbmfee r8,r6
andis. r0,r8,SLB_ESID_V@h
beq 2f
add r8,r8,r6 /* put index in */
slbmfev r3,r6
std r8,VCPU_SLB_E(r7)
std r3,VCPU_SLB_V(r7)
addi r7,r7,VCPU_SLB_SIZE
addi r5,r5,1
2: addi r6,r6,1
bdnz 1b
stw r5,VCPU_SLB_MAX(r9)
/*
* Save the guest PURR/SPURR
*/
BEGIN_FTR_SECTION
mfspr r5,SPRN_PURR
mfspr r6,SPRN_SPURR
ld r7,VCPU_PURR(r9)
ld r8,VCPU_SPURR(r9)
std r5,VCPU_PURR(r9)
std r6,VCPU_SPURR(r9)
subf r5,r7,r5
subf r6,r8,r6
/*
* Restore host PURR/SPURR and add guest times
* so that the time in the guest gets accounted.
*/
ld r3,HSTATE_PURR(r13)
ld r4,HSTATE_SPURR(r13)
add r3,r3,r5
add r4,r4,r6
mtspr SPRN_PURR,r3
mtspr SPRN_SPURR,r4
END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_201)
/* Clear out SLB */
li r5,0
slbmte r5,r5
slbia
ptesync
hdec_soon: /* r9 = vcpu, r12 = trap, r13 = paca */
BEGIN_FTR_SECTION
b 32f
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
/*
* POWER7 guest -> host partition switch code.
* We don't have to lock against tlbies but we do
* have to coordinate the hardware threads.
*/
/* Increment the threads-exiting-guest count in the 0xff00
bits of vcore->entry_exit_count */
lwsync
ld r5,HSTATE_KVM_VCORE(r13)
addi r6,r5,VCORE_ENTRY_EXIT
41: lwarx r3,0,r6
addi r0,r3,0x100
stwcx. r0,0,r6
bne 41b
lwsync
/*
* At this point we have an interrupt that we have to pass
* up to the kernel or qemu; we can't handle it in real mode.
* Thus we have to do a partition switch, so we have to
* collect the other threads, if we are the first thread
* to take an interrupt. To do this, we set the HDEC to 0,
* which causes an HDEC interrupt in all threads within 2ns
* because the HDEC register is shared between all 4 threads.
* However, we don't need to bother if this is an HDEC
* interrupt, since the other threads will already be on their
* way here in that case.
*/
cmpwi r3,0x100 /* Are we the first here? */
bge 43f
cmpwi r3,1 /* Are any other threads in the guest? */
ble 43f
cmpwi r12,BOOK3S_INTERRUPT_HV_DECREMENTER
beq 40f
li r0,0
mtspr SPRN_HDEC,r0
40:
/*
* Send an IPI to any napping threads, since an HDEC interrupt
* doesn't wake CPUs up from nap.
*/
lwz r3,VCORE_NAPPING_THREADS(r5)
lwz r4,VCPU_PTID(r9)
li r0,1
sldi r0,r0,r4
andc. r3,r3,r0 /* no sense IPI'ing ourselves */
beq 43f
mulli r4,r4,PACA_SIZE /* get paca for thread 0 */
subf r6,r4,r13
42: andi. r0,r3,1
beq 44f
ld r8,HSTATE_XICS_PHYS(r6) /* get thread's XICS reg addr */
li r0,IPI_PRIORITY
li r7,XICS_QIRR
stbcix r0,r7,r8 /* trigger the IPI */
44: srdi. r3,r3,1
addi r6,r6,PACA_SIZE
bne 42b
/* Secondary threads wait for primary to do partition switch */
43: ld r4,VCPU_KVM(r9) /* pointer to struct kvm */
ld r5,HSTATE_KVM_VCORE(r13)
lwz r3,VCPU_PTID(r9)
cmpwi r3,0
beq 15f
HMT_LOW
13: lbz r3,VCORE_IN_GUEST(r5)
cmpwi r3,0
bne 13b
HMT_MEDIUM
b 16f
/* Primary thread waits for all the secondaries to exit guest */
15: lwz r3,VCORE_ENTRY_EXIT(r5)
srwi r0,r3,8
clrldi r3,r3,56
cmpw r3,r0
bne 15b
isync
/* Primary thread switches back to host partition */
ld r6,KVM_HOST_SDR1(r4)
lwz r7,KVM_HOST_LPID(r4)
li r8,LPID_RSVD /* switch to reserved LPID */
mtspr SPRN_LPID,r8
ptesync
mtspr SPRN_SDR1,r6 /* switch to partition page table */
mtspr SPRN_LPID,r7
isync
li r0,0
stb r0,VCORE_IN_GUEST(r5)
lis r8,0x7fff /* MAX_INT@h */
mtspr SPRN_HDEC,r8
16: ld r8,KVM_HOST_LPCR(r4)
mtspr SPRN_LPCR,r8
isync
b 33f
/*
* PPC970 guest -> host partition switch code.
* We have to lock against concurrent tlbies, and
* we have to flush the whole TLB.
*/
32: ld r4,VCPU_KVM(r9) /* pointer to struct kvm */
/* Take the guest's tlbie_lock */
lwz r8,PACA_LOCK_TOKEN(r13)
addi r3,r4,KVM_TLBIE_LOCK
24: lwarx r0,0,r3
cmpwi r0,0
bne 24b
stwcx. r8,0,r3
bne 24b
isync
ld r7,KVM_HOST_LPCR(r4) /* use kvm->arch.host_lpcr for HID4 */
li r0,0x18f
rotldi r0,r0,HID4_LPID5_SH /* all lpid bits in HID4 = 1 */
or r0,r7,r0
ptesync
sync
mtspr SPRN_HID4,r0 /* switch to reserved LPID */
isync
li r0,0
stw r0,0(r3) /* drop guest tlbie_lock */
/* invalidate the whole TLB */
li r0,256
mtctr r0
li r6,0
25: tlbiel r6
addi r6,r6,0x1000
bdnz 25b
ptesync
/* take native_tlbie_lock */
ld r3,toc_tlbie_lock@toc(2)
24: lwarx r0,0,r3
cmpwi r0,0
bne 24b
stwcx. r8,0,r3
bne 24b
isync
ld r6,KVM_HOST_SDR1(r4)
mtspr SPRN_SDR1,r6 /* switch to host page table */
/* Set up host HID4 value */
sync
mtspr SPRN_HID4,r7
isync
li r0,0
stw r0,0(r3) /* drop native_tlbie_lock */
lis r8,0x7fff /* MAX_INT@h */
mtspr SPRN_HDEC,r8
/* Disable HDEC interrupts */
mfspr r0,SPRN_HID0
li r3,0
rldimi r0,r3, HID0_HDICE_SH, 64-HID0_HDICE_SH-1
sync
mtspr SPRN_HID0,r0
mfspr r0,SPRN_HID0
mfspr r0,SPRN_HID0
mfspr r0,SPRN_HID0
mfspr r0,SPRN_HID0
mfspr r0,SPRN_HID0
mfspr r0,SPRN_HID0
/* load host SLB entries */
33: ld r8,PACA_SLBSHADOWPTR(r13)
.rept SLB_NUM_BOLTED
ld r5,SLBSHADOW_SAVEAREA(r8)
ld r6,SLBSHADOW_SAVEAREA+8(r8)
andis. r7,r5,SLB_ESID_V@h
beq 1f
slbmte r6,r5
1: addi r8,r8,16
.endr
/* Save and reset AMR and UAMOR before turning on the MMU */
BEGIN_FTR_SECTION
mfspr r5,SPRN_AMR
mfspr r6,SPRN_UAMOR
std r5,VCPU_AMR(r9)
std r6,VCPU_UAMOR(r9)
li r6,0
mtspr SPRN_AMR,r6
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
/* Restore host DABR and DABRX */
ld r5,HSTATE_DABR(r13)
li r6,7
mtspr SPRN_DABR,r5
mtspr SPRN_DABRX,r6
/* Switch DSCR back to host value */
BEGIN_FTR_SECTION
mfspr r8, SPRN_DSCR
ld r7, HSTATE_DSCR(r13)
std r8, VCPU_DSCR(r7)
mtspr SPRN_DSCR, r7
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
/* Save non-volatile GPRs */
std r14, VCPU_GPR(r14)(r9)
std r15, VCPU_GPR(r15)(r9)
std r16, VCPU_GPR(r16)(r9)
std r17, VCPU_GPR(r17)(r9)
std r18, VCPU_GPR(r18)(r9)
std r19, VCPU_GPR(r19)(r9)
std r20, VCPU_GPR(r20)(r9)
std r21, VCPU_GPR(r21)(r9)
std r22, VCPU_GPR(r22)(r9)
std r23, VCPU_GPR(r23)(r9)
std r24, VCPU_GPR(r24)(r9)
std r25, VCPU_GPR(r25)(r9)
std r26, VCPU_GPR(r26)(r9)
std r27, VCPU_GPR(r27)(r9)
std r28, VCPU_GPR(r28)(r9)
std r29, VCPU_GPR(r29)(r9)
std r30, VCPU_GPR(r30)(r9)
std r31, VCPU_GPR(r31)(r9)
/* Save SPRGs */
mfspr r3, SPRN_SPRG0
mfspr r4, SPRN_SPRG1
mfspr r5, SPRN_SPRG2
mfspr r6, SPRN_SPRG3
std r3, VCPU_SPRG0(r9)
std r4, VCPU_SPRG1(r9)
std r5, VCPU_SPRG2(r9)
std r6, VCPU_SPRG3(r9)
/* Increment yield count if they have a VPA */
ld r8, VCPU_VPA(r9) /* do they have a VPA? */
cmpdi r8, 0
beq 25f
lwz r3, LPPACA_YIELDCOUNT(r8)
addi r3, r3, 1
stw r3, LPPACA_YIELDCOUNT(r8)
25:
/* Save PMU registers if requested */
/* r8 and cr0.eq are live here */
li r3, 1
sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */
mfspr r4, SPRN_MMCR0 /* save MMCR0 */
mtspr SPRN_MMCR0, r3 /* freeze all counters, disable ints */
isync
beq 21f /* if no VPA, save PMU stuff anyway */
lbz r7, LPPACA_PMCINUSE(r8)
cmpwi r7, 0 /* did they ask for PMU stuff to be saved? */
bne 21f
std r3, VCPU_MMCR(r9) /* if not, set saved MMCR0 to FC */
b 22f
21: mfspr r5, SPRN_MMCR1
mfspr r6, SPRN_MMCRA
std r4, VCPU_MMCR(r9)
std r5, VCPU_MMCR + 8(r9)
std r6, VCPU_MMCR + 16(r9)
mfspr r3, SPRN_PMC1
mfspr r4, SPRN_PMC2
mfspr r5, SPRN_PMC3
mfspr r6, SPRN_PMC4
mfspr r7, SPRN_PMC5
mfspr r8, SPRN_PMC6
BEGIN_FTR_SECTION
mfspr r10, SPRN_PMC7
mfspr r11, SPRN_PMC8
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
stw r3, VCPU_PMC(r9)
stw r4, VCPU_PMC + 4(r9)
stw r5, VCPU_PMC + 8(r9)
stw r6, VCPU_PMC + 12(r9)
stw r7, VCPU_PMC + 16(r9)
stw r8, VCPU_PMC + 20(r9)
BEGIN_FTR_SECTION
stw r10, VCPU_PMC + 24(r9)
stw r11, VCPU_PMC + 28(r9)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
22:
/* save FP state */
mr r3, r9
bl .kvmppc_save_fp
/* Secondary threads go off to take a nap on POWER7 */
BEGIN_FTR_SECTION
lwz r0,VCPU_PTID(r3)
cmpwi r0,0
bne secondary_nap
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
/*
* Reload DEC. HDEC interrupts were disabled when
* we reloaded the host's LPCR value.
*/
ld r3, HSTATE_DECEXP(r13)
mftb r4
subf r4, r4, r3
mtspr SPRN_DEC, r4
/* Reload the host's PMU registers */
ld r3, PACALPPACAPTR(r13) /* is the host using the PMU? */
lbz r4, LPPACA_PMCINUSE(r3)
cmpwi r4, 0
beq 23f /* skip if not */
lwz r3, HSTATE_PMC(r13)
lwz r4, HSTATE_PMC + 4(r13)
lwz r5, HSTATE_PMC + 8(r13)
lwz r6, HSTATE_PMC + 12(r13)
lwz r8, HSTATE_PMC + 16(r13)
lwz r9, HSTATE_PMC + 20(r13)
BEGIN_FTR_SECTION
lwz r10, HSTATE_PMC + 24(r13)
lwz r11, HSTATE_PMC + 28(r13)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
mtspr SPRN_PMC1, r3
mtspr SPRN_PMC2, r4
mtspr SPRN_PMC3, r5
mtspr SPRN_PMC4, r6
mtspr SPRN_PMC5, r8
mtspr SPRN_PMC6, r9
BEGIN_FTR_SECTION
mtspr SPRN_PMC7, r10
mtspr SPRN_PMC8, r11
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
ld r3, HSTATE_MMCR(r13)
ld r4, HSTATE_MMCR + 8(r13)
ld r5, HSTATE_MMCR + 16(r13)
mtspr SPRN_MMCR1, r4
mtspr SPRN_MMCRA, r5
mtspr SPRN_MMCR0, r3
isync
23:
/*
* For external and machine check interrupts, we need
* to call the Linux handler to process the interrupt.
* We do that by jumping to the interrupt vector address
* which we have in r12. The [h]rfid at the end of the
* handler will return to the book3s_hv_interrupts.S code.
* For other interrupts we do the rfid to get back
* to the book3s_interrupts.S code here.
*/
ld r8, HSTATE_VMHANDLER(r13)
ld r7, HSTATE_HOST_MSR(r13)
cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL
beq 11f
cmpwi r12, BOOK3S_INTERRUPT_MACHINE_CHECK
/* RFI into the highmem handler, or branch to interrupt handler */
12: mfmsr r6
mtctr r12
li r0, MSR_RI
andc r6, r6, r0
mtmsrd r6, 1 /* Clear RI in MSR */
mtsrr0 r8
mtsrr1 r7
beqctr
RFI
11:
BEGIN_FTR_SECTION
b 12b
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
mtspr SPRN_HSRR0, r8
mtspr SPRN_HSRR1, r7
ba 0x500
/*
* Check whether an HDSI is an HPTE not found fault or something else.
* If it is an HPTE not found fault that is due to the guest accessing
* a page that they have mapped but which we have paged out, then
* we continue on with the guest exit path. In all other cases,
* reflect the HDSI to the guest as a DSI.
*/
kvmppc_hdsi:
mfspr r4, SPRN_HDAR
mfspr r6, SPRN_HDSISR
/* HPTE not found fault? */
andis. r0, r6, DSISR_NOHPTE@h
beq 1f /* if not, send it to the guest */
andi. r0, r11, MSR_DR /* data relocation enabled? */
beq 3f
clrrdi r0, r4, 28
PPC_SLBFEE_DOT(r5, r0) /* if so, look up SLB */
bne 1f /* if no SLB entry found */
4: std r4, VCPU_FAULT_DAR(r9)
stw r6, VCPU_FAULT_DSISR(r9)
/* Search the hash table. */
mr r3, r9 /* vcpu pointer */
bl .kvmppc_hpte_hv_fault
ld r9, HSTATE_KVM_VCPU(r13)
ld r10, VCPU_PC(r9)
ld r11, VCPU_MSR(r9)
li r12, BOOK3S_INTERRUPT_H_DATA_STORAGE
cmpdi r3, 0 /* retry the instruction */
beq 6f
cmpdi r3, -1 /* handle in kernel mode */
beq nohpte_cont
cmpdi r3, -2 /* MMIO emulation; need instr word */
beq 2f
/* Synthesize a DSI for the guest */
ld r4, VCPU_FAULT_DAR(r9)
mr r6, r3
1: mtspr SPRN_DAR, r4
mtspr SPRN_DSISR, r6
mtspr SPRN_SRR0, r10
mtspr SPRN_SRR1, r11
li r10, BOOK3S_INTERRUPT_DATA_STORAGE
li r11, (MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */
rotldi r11, r11, 63
6: ld r7, VCPU_CTR(r9)
lwz r8, VCPU_XER(r9)
mtctr r7
mtxer r8
mr r4, r9
b fast_guest_return
3: ld r5, VCPU_KVM(r9) /* not relocated, use VRMA */
ld r5, KVM_VRMA_SLB_V(r5)
b 4b
/* If this is for emulated MMIO, load the instruction word */
2: li r8, KVM_INST_FETCH_FAILED /* In case lwz faults */
/* Set guest mode to 'jump over instruction' so if lwz faults
* we'll just continue at the next IP. */
li r0, KVM_GUEST_MODE_SKIP
stb r0, HSTATE_IN_GUEST(r13)
/* Do the access with MSR:DR enabled */
mfmsr r3
ori r4, r3, MSR_DR /* Enable paging for data */
mtmsrd r4
lwz r8, 0(r10)
mtmsrd r3
/* Store the result */
stw r8, VCPU_LAST_INST(r9)
/* Unset guest mode. */
li r0, KVM_GUEST_MODE_NONE
stb r0, HSTATE_IN_GUEST(r13)
b nohpte_cont
/*
* Try to handle an hcall in real mode.
* Returns to the guest if we handle it, or continues on up to
* the kernel if we can't (i.e. if we don't have a handler for
* it, or if the handler returns H_TOO_HARD).
*/
.globl hcall_try_real_mode
hcall_try_real_mode:
ld r3,VCPU_GPR(r3)(r9)
andi. r0,r11,MSR_PR
bne hcall_real_cont
clrrdi r3,r3,2
cmpldi r3,hcall_real_table_end - hcall_real_table
bge hcall_real_cont
LOAD_REG_ADDR(r4, hcall_real_table)
lwzx r3,r3,r4
cmpwi r3,0
beq hcall_real_cont
add r3,r3,r4
mtctr r3
mr r3,r9 /* get vcpu pointer */
ld r4,VCPU_GPR(r4)(r9)
bctrl
cmpdi r3,H_TOO_HARD
beq hcall_real_fallback
ld r4,HSTATE_KVM_VCPU(r13)
std r3,VCPU_GPR(r3)(r4)
ld r10,VCPU_PC(r4)
ld r11,VCPU_MSR(r4)
b fast_guest_return
/* We've attempted a real mode hcall, but it's punted it back
* to userspace. We need to restore some clobbered volatiles
* before resuming the pass-it-to-qemu path */
hcall_real_fallback:
li r12,BOOK3S_INTERRUPT_SYSCALL
ld r9, HSTATE_KVM_VCPU(r13)
b hcall_real_cont
.globl hcall_real_table
hcall_real_table:
.long 0 /* 0 - unused */
.long .kvmppc_h_remove - hcall_real_table
.long .kvmppc_h_enter - hcall_real_table
.long .kvmppc_h_read - hcall_real_table
.long 0 /* 0x10 - H_CLEAR_MOD */
.long 0 /* 0x14 - H_CLEAR_REF */
.long .kvmppc_h_protect - hcall_real_table
.long 0 /* 0x1c - H_GET_TCE */
.long .kvmppc_h_put_tce - hcall_real_table
.long 0 /* 0x24 - H_SET_SPRG0 */
.long .kvmppc_h_set_dabr - hcall_real_table
.long 0 /* 0x2c */
.long 0 /* 0x30 */
.long 0 /* 0x34 */
.long 0 /* 0x38 */
.long 0 /* 0x3c */
.long 0 /* 0x40 */
.long 0 /* 0x44 */
.long 0 /* 0x48 */
.long 0 /* 0x4c */
.long 0 /* 0x50 */
.long 0 /* 0x54 */
.long 0 /* 0x58 */
.long 0 /* 0x5c */
.long 0 /* 0x60 */
.long 0 /* 0x64 */
.long 0 /* 0x68 */
.long 0 /* 0x6c */
.long 0 /* 0x70 */
.long 0 /* 0x74 */
.long 0 /* 0x78 */
.long 0 /* 0x7c */
.long 0 /* 0x80 */
.long 0 /* 0x84 */
.long 0 /* 0x88 */
.long 0 /* 0x8c */
.long 0 /* 0x90 */
.long 0 /* 0x94 */
.long 0 /* 0x98 */
.long 0 /* 0x9c */
.long 0 /* 0xa0 */
.long 0 /* 0xa4 */
.long 0 /* 0xa8 */
.long 0 /* 0xac */
.long 0 /* 0xb0 */
.long 0 /* 0xb4 */
.long 0 /* 0xb8 */
.long 0 /* 0xbc */
.long 0 /* 0xc0 */
.long 0 /* 0xc4 */
.long 0 /* 0xc8 */
.long 0 /* 0xcc */
.long 0 /* 0xd0 */
.long 0 /* 0xd4 */
.long 0 /* 0xd8 */
.long 0 /* 0xdc */
.long .kvmppc_h_cede - hcall_real_table
.long 0 /* 0xe4 */
.long 0 /* 0xe8 */
.long 0 /* 0xec */
.long 0 /* 0xf0 */
.long 0 /* 0xf4 */
.long 0 /* 0xf8 */
.long 0 /* 0xfc */
.long 0 /* 0x100 */
.long 0 /* 0x104 */
.long 0 /* 0x108 */
.long 0 /* 0x10c */
.long 0 /* 0x110 */
.long 0 /* 0x114 */
.long 0 /* 0x118 */
.long 0 /* 0x11c */
.long 0 /* 0x120 */
.long .kvmppc_h_bulk_remove - hcall_real_table
hcall_real_table_end:
ignore_hdec:
mr r4,r9
b fast_guest_return
bounce_ext_interrupt:
mr r4,r9
mtspr SPRN_SRR0,r10
mtspr SPRN_SRR1,r11
li r10,BOOK3S_INTERRUPT_EXTERNAL
li r11,(MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */
rotldi r11,r11,63
b fast_guest_return
_GLOBAL(kvmppc_h_set_dabr)
std r4,VCPU_DABR(r3)
mtspr SPRN_DABR,r4
li r3,0
blr
_GLOBAL(kvmppc_h_cede)
ori r11,r11,MSR_EE
std r11,VCPU_MSR(r3)
li r0,1
stb r0,VCPU_CEDED(r3)
sync /* order setting ceded vs. testing prodded */
lbz r5,VCPU_PRODDED(r3)
cmpwi r5,0
bne 1f
li r0,0 /* set trap to 0 to say hcall is handled */
stw r0,VCPU_TRAP(r3)
li r0,H_SUCCESS
std r0,VCPU_GPR(r3)(r3)
BEGIN_FTR_SECTION
b 2f /* just send it up to host on 970 */
END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_206)
/*
* Set our bit in the bitmask of napping threads unless all the
* other threads are already napping, in which case we send this
* up to the host.
*/
ld r5,HSTATE_KVM_VCORE(r13)
lwz r6,VCPU_PTID(r3)
lwz r8,VCORE_ENTRY_EXIT(r5)
clrldi r8,r8,56
li r0,1
sld r0,r0,r6
addi r6,r5,VCORE_NAPPING_THREADS
31: lwarx r4,0,r6
or r4,r4,r0
PPC_POPCNTW(r7,r4)
cmpw r7,r8
bge 2f
stwcx. r4,0,r6
bne 31b
li r0,1
stb r0,HSTATE_NAPPING(r13)
/* order napping_threads update vs testing entry_exit_count */
lwsync
mr r4,r3
lwz r7,VCORE_ENTRY_EXIT(r5)
cmpwi r7,0x100
bge 33f /* another thread already exiting */
/*
* Although not specifically required by the architecture, POWER7
* preserves the following registers in nap mode, even if an SMT mode
* switch occurs: SLB entries, PURR, SPURR, AMOR, UAMOR, AMR, SPRG0-3,
* DAR, DSISR, DABR, DABRX, DSCR, PMCx, MMCRx, SIAR, SDAR.
*/
/* Save non-volatile GPRs */
std r14, VCPU_GPR(r14)(r3)
std r15, VCPU_GPR(r15)(r3)
std r16, VCPU_GPR(r16)(r3)
std r17, VCPU_GPR(r17)(r3)
std r18, VCPU_GPR(r18)(r3)
std r19, VCPU_GPR(r19)(r3)
std r20, VCPU_GPR(r20)(r3)
std r21, VCPU_GPR(r21)(r3)
std r22, VCPU_GPR(r22)(r3)
std r23, VCPU_GPR(r23)(r3)
std r24, VCPU_GPR(r24)(r3)
std r25, VCPU_GPR(r25)(r3)
std r26, VCPU_GPR(r26)(r3)
std r27, VCPU_GPR(r27)(r3)
std r28, VCPU_GPR(r28)(r3)
std r29, VCPU_GPR(r29)(r3)
std r30, VCPU_GPR(r30)(r3)
std r31, VCPU_GPR(r31)(r3)
/* save FP state */
bl .kvmppc_save_fp
/*
* Take a nap until a decrementer or external interrupt occurs,
* with PECE1 (wake on decr) and PECE0 (wake on external) set in LPCR
*/
li r0,0x80
stb r0,PACAPROCSTART(r13)
mfspr r5,SPRN_LPCR
ori r5,r5,LPCR_PECE0 | LPCR_PECE1
mtspr SPRN_LPCR,r5
isync
li r0, 0
std r0, HSTATE_SCRATCH0(r13)
ptesync
ld r0, HSTATE_SCRATCH0(r13)
1: cmpd r0, r0
bne 1b
nap
b .
kvm_end_cede:
/* Woken by external or decrementer interrupt */
ld r1, HSTATE_HOST_R1(r13)
ld r2, PACATOC(r13)
/* If we're a secondary thread and we got here by an IPI, ack it */
ld r4,HSTATE_KVM_VCPU(r13)
lwz r3,VCPU_PTID(r4)
cmpwi r3,0
beq 27f
mfspr r3,SPRN_SRR1
rlwinm r3,r3,44-31,0x7 /* extract wake reason field */
cmpwi r3,4 /* was it an external interrupt? */
bne 27f
ld r5, HSTATE_XICS_PHYS(r13)
li r0,0xff
li r6,XICS_QIRR
li r7,XICS_XIRR
lwzcix r8,r5,r7 /* ack the interrupt */
sync
stbcix r0,r5,r6 /* clear it */
stwcix r8,r5,r7 /* EOI it */
27:
/* load up FP state */
bl kvmppc_load_fp
/* Load NV GPRS */
ld r14, VCPU_GPR(r14)(r4)
ld r15, VCPU_GPR(r15)(r4)
ld r16, VCPU_GPR(r16)(r4)
ld r17, VCPU_GPR(r17)(r4)
ld r18, VCPU_GPR(r18)(r4)
ld r19, VCPU_GPR(r19)(r4)
ld r20, VCPU_GPR(r20)(r4)
ld r21, VCPU_GPR(r21)(r4)
ld r22, VCPU_GPR(r22)(r4)
ld r23, VCPU_GPR(r23)(r4)
ld r24, VCPU_GPR(r24)(r4)
ld r25, VCPU_GPR(r25)(r4)
ld r26, VCPU_GPR(r26)(r4)
ld r27, VCPU_GPR(r27)(r4)
ld r28, VCPU_GPR(r28)(r4)
ld r29, VCPU_GPR(r29)(r4)
ld r30, VCPU_GPR(r30)(r4)
ld r31, VCPU_GPR(r31)(r4)
/* clear our bit in vcore->napping_threads */
33: ld r5,HSTATE_KVM_VCORE(r13)
lwz r3,VCPU_PTID(r4)
li r0,1
sld r0,r0,r3
addi r6,r5,VCORE_NAPPING_THREADS
32: lwarx r7,0,r6
andc r7,r7,r0
stwcx. r7,0,r6
bne 32b
li r0,0
stb r0,HSTATE_NAPPING(r13)
/* see if any other thread is already exiting */
lwz r0,VCORE_ENTRY_EXIT(r5)
cmpwi r0,0x100
blt kvmppc_cede_reentry /* if not go back to guest */
/* some threads are exiting, so go to the guest exit path */
b hcall_real_fallback
/* cede when already previously prodded case */
1: li r0,0
stb r0,VCPU_PRODDED(r3)
sync /* order testing prodded vs. clearing ceded */
stb r0,VCPU_CEDED(r3)
li r3,H_SUCCESS
blr
/* we've ceded but we want to give control to the host */
2: li r3,H_TOO_HARD
blr
secondary_too_late:
ld r5,HSTATE_KVM_VCORE(r13)
HMT_LOW
13: lbz r3,VCORE_IN_GUEST(r5)
cmpwi r3,0
bne 13b
HMT_MEDIUM
ld r11,PACA_SLBSHADOWPTR(r13)
.rept SLB_NUM_BOLTED
ld r5,SLBSHADOW_SAVEAREA(r11)
ld r6,SLBSHADOW_SAVEAREA+8(r11)
andis. r7,r5,SLB_ESID_V@h
beq 1f
slbmte r6,r5
1: addi r11,r11,16
.endr
secondary_nap:
/* Clear any pending IPI - assume we're a secondary thread */
ld r5, HSTATE_XICS_PHYS(r13)
li r7, XICS_XIRR
lwzcix r3, r5, r7 /* ack any pending interrupt */
rlwinm. r0, r3, 0, 0xffffff /* any pending? */
beq 37f
sync
li r0, 0xff
li r6, XICS_QIRR
stbcix r0, r5, r6 /* clear the IPI */
stwcix r3, r5, r7 /* EOI it */
37: sync
/* increment the nap count and then go to nap mode */
ld r4, HSTATE_KVM_VCORE(r13)
addi r4, r4, VCORE_NAP_COUNT
lwsync /* make previous updates visible */
51: lwarx r3, 0, r4
addi r3, r3, 1
stwcx. r3, 0, r4
bne 51b
li r3, LPCR_PECE0
mfspr r4, SPRN_LPCR
rlwimi r4, r3, 0, LPCR_PECE0 | LPCR_PECE1
mtspr SPRN_LPCR, r4
isync
li r0, 0
std r0, HSTATE_SCRATCH0(r13)
ptesync
ld r0, HSTATE_SCRATCH0(r13)
1: cmpd r0, r0
bne 1b
nap
b .
/*
* Save away FP, VMX and VSX registers.
* r3 = vcpu pointer
*/
_GLOBAL(kvmppc_save_fp)
mfmsr r9
ori r8,r9,MSR_FP
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION
oris r8,r8,MSR_VEC@h
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif
#ifdef CONFIG_VSX
BEGIN_FTR_SECTION
oris r8,r8,MSR_VSX@h
END_FTR_SECTION_IFSET(CPU_FTR_VSX)
#endif
mtmsrd r8
isync
#ifdef CONFIG_VSX
BEGIN_FTR_SECTION
reg = 0
.rept 32
li r6,reg*16+VCPU_VSRS
STXVD2X(reg,r6,r3)
reg = reg + 1
.endr
FTR_SECTION_ELSE
#endif
reg = 0
.rept 32
stfd reg,reg*8+VCPU_FPRS(r3)
reg = reg + 1
.endr
#ifdef CONFIG_VSX
ALT_FTR_SECTION_END_IFSET(CPU_FTR_VSX)
#endif
mffs fr0
stfd fr0,VCPU_FPSCR(r3)
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION
reg = 0
.rept 32
li r6,reg*16+VCPU_VRS
stvx reg,r6,r3
reg = reg + 1
.endr
mfvscr vr0
li r6,VCPU_VSCR
stvx vr0,r6,r3
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif
mfspr r6,SPRN_VRSAVE
stw r6,VCPU_VRSAVE(r3)
mtmsrd r9
isync
blr
/*
* Load up FP, VMX and VSX registers
* r4 = vcpu pointer
*/
.globl kvmppc_load_fp
kvmppc_load_fp:
mfmsr r9
ori r8,r9,MSR_FP
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION
oris r8,r8,MSR_VEC@h
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif
#ifdef CONFIG_VSX
BEGIN_FTR_SECTION
oris r8,r8,MSR_VSX@h
END_FTR_SECTION_IFSET(CPU_FTR_VSX)
#endif
mtmsrd r8
isync
lfd fr0,VCPU_FPSCR(r4)
MTFSF_L(fr0)
#ifdef CONFIG_VSX
BEGIN_FTR_SECTION
reg = 0
.rept 32
li r7,reg*16+VCPU_VSRS
LXVD2X(reg,r7,r4)
reg = reg + 1
.endr
FTR_SECTION_ELSE
#endif
reg = 0
.rept 32
lfd reg,reg*8+VCPU_FPRS(r4)
reg = reg + 1
.endr
#ifdef CONFIG_VSX
ALT_FTR_SECTION_END_IFSET(CPU_FTR_VSX)
#endif
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION
li r7,VCPU_VSCR
lvx vr0,r7,r4
mtvscr vr0
reg = 0
.rept 32
li r7,reg*16+VCPU_VRS
lvx reg,r7,r4
reg = reg + 1
.endr
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif
lwz r7,VCPU_VRSAVE(r4)
mtspr SPRN_VRSAVE,r7
blr
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