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android-kvm / linux / cbfdfd5624ebd6493c39d7f6400feaa03962e6ef / . / arch / powerpc / kvm / book3s_hv_rmhandlers.S
blob: 37f50861dd98fe538af9424d68424675dee3e612 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0-only */
/*
*
* 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/code-patching-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>
#include <asm/kvm_book3s_asm.h>
#include <asm/book3s/64/mmu-hash.h>
#include <asm/export.h>
#include <asm/tm.h>
#include <asm/opal.h>
#include <asm/thread_info.h>
#include <asm/asm-compat.h>
#include <asm/feature-fixups.h>
#include <asm/cpuidle.h>
/* Values in HSTATE_NAPPING(r13) */
#define NAPPING_CEDE 1
#define NAPPING_NOVCPU 2
#define NAPPING_UNSPLIT 3
/* Stack frame offsets for kvmppc_hv_entry */
#define SFS 160
#define STACK_SLOT_TRAP (SFS-4)
#define STACK_SLOT_TID (SFS-16)
#define STACK_SLOT_PSSCR (SFS-24)
#define STACK_SLOT_PID (SFS-32)
#define STACK_SLOT_IAMR (SFS-40)
#define STACK_SLOT_CIABR (SFS-48)
#define STACK_SLOT_DAWR0 (SFS-56)
#define STACK_SLOT_DAWRX0 (SFS-64)
#define STACK_SLOT_HFSCR (SFS-72)
#define STACK_SLOT_AMR (SFS-80)
#define STACK_SLOT_UAMOR (SFS-88)
#define STACK_SLOT_FSCR (SFS-96)
/*
* Use the last LPID (all implemented LPID bits = 1) for partition switching.
* This is reserved in the LPID allocator. POWER7 only implements 0x3ff, but
* we write 0xfff into the LPID SPR anyway, which seems to work and just
* ignores the top bits.
*/
#define LPID_RSVD 0xfff
/*
* 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_TOC(kvmppc_hv_entry_trampoline)
mflr r0
std r0, PPC_LR_STKOFF(r1)
stdu r1, -112(r1)
mfmsr r10
std r10, HSTATE_HOST_MSR(r13)
LOAD_REG_ADDR(r5, kvmppc_call_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_TO_KERNEL
kvmppc_call_hv_entry:
ld r4, HSTATE_KVM_VCPU(r13)
bl kvmppc_hv_entry
/* Back from guest - restore host state and return to caller */
BEGIN_FTR_SECTION
/* Restore host DABR and DABRX */
ld r5,HSTATE_DABR(r13)
li r6,7
mtspr SPRN_DABR,r5
mtspr SPRN_DABRX,r6
END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
/* Restore SPRG3 */
ld r3,PACA_SPRG_VDSO(r13)
mtspr SPRN_SPRG_VDSO_WRITE,r3
/* Reload the host's PMU registers */
bl kvmhv_load_host_pmu
/*
* 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
/* hwthread_req may have got set by cede or no vcpu, so clear it */
li r0, 0
stb r0, HSTATE_HWTHREAD_REQ(r13)
/*
* For external interrupts we need to call the Linux
* handler to process the interrupt. We do that by jumping
* to absolute address 0x500 for external interrupts.
* 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_hv_interrupts.S
* code here.
*/
ld r8, 112+PPC_LR_STKOFF(r1)
addi r1, r1, 112
ld r7, HSTATE_HOST_MSR(r13)
/* Return the trap number on this thread as the return value */
mr r3, r12
/* RFI into the highmem handler */
mfmsr r6
li r0, MSR_RI
andc r6, r6, r0
mtmsrd r6, 1 /* Clear RI in MSR */
mtsrr0 r8
mtsrr1 r7
RFI_TO_KERNEL
kvmppc_primary_no_guest:
/* We handle this much like a ceded vcpu */
/* put the HDEC into the DEC, since HDEC interrupts don't wake us */
/* HDEC may be larger than DEC for arch >= v3.00, but since the */
/* HDEC value came from DEC in the first place, it will fit */
mfspr r3, SPRN_HDEC
mtspr SPRN_DEC, r3
/*
* Make sure the primary has finished the MMU switch.
* We should never get here on a secondary thread, but
* check it for robustness' sake.
*/
ld r5, HSTATE_KVM_VCORE(r13)
65: lbz r0, VCORE_IN_GUEST(r5)
cmpwi r0, 0
beq 65b
/* Set LPCR. */
ld r8,VCORE_LPCR(r5)
mtspr SPRN_LPCR,r8
isync
/* set our bit in napping_threads */
ld r5, HSTATE_KVM_VCORE(r13)
lbz r7, HSTATE_PTID(r13)
li r0, 1
sld r0, r0, r7
addi r6, r5, VCORE_NAPPING_THREADS
1: lwarx r3, 0, r6
or r3, r3, r0
stwcx. r3, 0, r6
bne 1b
/* order napping_threads update vs testing entry_exit_map */
isync
li r12, 0
lwz r7, VCORE_ENTRY_EXIT(r5)
cmpwi r7, 0x100
bge kvm_novcpu_exit /* another thread already exiting */
li r3, NAPPING_NOVCPU
stb r3, HSTATE_NAPPING(r13)
li r3, 0 /* Don't wake on privileged (OS) doorbell */
b kvm_do_nap
/*
* kvm_novcpu_wakeup
* Entered from kvm_start_guest if kvm_hstate.napping is set
* to NAPPING_NOVCPU
* r2 = kernel TOC
* r13 = paca
*/
kvm_novcpu_wakeup:
ld r1, HSTATE_HOST_R1(r13)
ld r5, HSTATE_KVM_VCORE(r13)
li r0, 0
stb r0, HSTATE_NAPPING(r13)
/* check the wake reason */
bl kvmppc_check_wake_reason
/*
* Restore volatile registers since we could have called
* a C routine in kvmppc_check_wake_reason.
* r5 = VCORE
*/
ld r5, HSTATE_KVM_VCORE(r13)
/* see if any other thread is already exiting */
lwz r0, VCORE_ENTRY_EXIT(r5)
cmpwi r0, 0x100
bge kvm_novcpu_exit
/* clear our bit in napping_threads */
lbz r7, HSTATE_PTID(r13)
li r0, 1
sld r0, r0, r7
addi r6, r5, VCORE_NAPPING_THREADS
4: lwarx r7, 0, r6
andc r7, r7, r0
stwcx. r7, 0, r6
bne 4b
/* See if the wake reason means we need to exit */
cmpdi r3, 0
bge kvm_novcpu_exit
/* See if our timeslice has expired (HDEC is negative) */
mfspr r0, SPRN_HDEC
extsw r0, r0
li r12, BOOK3S_INTERRUPT_HV_DECREMENTER
cmpdi r0, 0
blt kvm_novcpu_exit
/* Got an IPI but other vcpus aren't yet exiting, must be a latecomer */
ld r4, HSTATE_KVM_VCPU(r13)
cmpdi r4, 0
beq kvmppc_primary_no_guest
#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
addi r3, r4, VCPU_TB_RMENTRY
bl kvmhv_start_timing
#endif
b kvmppc_got_guest
kvm_novcpu_exit:
#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
ld r4, HSTATE_KVM_VCPU(r13)
cmpdi r4, 0
beq 13f
addi r3, r4, VCPU_TB_RMEXIT
bl kvmhv_accumulate_time
#endif
13: mr r3, r12
stw r12, STACK_SLOT_TRAP(r1)
bl kvmhv_commence_exit
nop
b kvmhv_switch_to_host
/*
* We come in here when wakened from Linux offline idle code.
* Relocation is off
* r3 contains the SRR1 wakeup value, SRR1 is trashed.
*/
_GLOBAL(idle_kvm_start_guest)
mfcr r5
mflr r0
std r5, 8(r1) // Save CR in caller's frame
std r0, 16(r1) // Save LR in caller's frame
// Create frame on emergency stack
ld r4, PACAEMERGSP(r13)
stdu r1, -SWITCH_FRAME_SIZE(r4)
// Switch to new frame on emergency stack
mr r1, r4
std r3, 32(r1) // Save SRR1 wakeup value
SAVE_NVGPRS(r1)
/*
* Could avoid this and pass it through in r3. For now,
* code expects it to be in SRR1.
*/
mtspr SPRN_SRR1,r3
li r0,0
stb r0,PACA_FTRACE_ENABLED(r13)
li r0,KVM_HWTHREAD_IN_KVM
stb r0,HSTATE_HWTHREAD_STATE(r13)
/* kvm cede / napping does not come through here */
lbz r0,HSTATE_NAPPING(r13)
twnei r0,0
b 1f
kvm_unsplit_wakeup:
li r0, 0
stb r0, HSTATE_NAPPING(r13)
1:
/*
* We weren't napping due to cede, so this must be a secondary
* thread being woken up to run a guest, or being woken up due
* to a stray IPI. (Or due to some machine check or hypervisor
* maintenance interrupt while the core is in KVM.)
*/
/* Check the wake reason in SRR1 to see why we got here */
bl kvmppc_check_wake_reason
/*
* kvmppc_check_wake_reason could invoke a C routine, but we
* have no volatile registers to restore when we return.
*/
cmpdi r3, 0
bge kvm_no_guest
/* get vcore pointer, NULL if we have nothing to run */
ld r5,HSTATE_KVM_VCORE(r13)
cmpdi r5,0
/* if we have no vcore to run, go back to sleep */
beq kvm_no_guest
kvm_secondary_got_guest:
// About to go to guest, clear saved SRR1
li r0, 0
std r0, 32(r1)
/* Set HSTATE_DSCR(r13) to something sensible */
ld r6, PACA_DSCR_DEFAULT(r13)
std r6, HSTATE_DSCR(r13)
/* On thread 0 of a subcore, set HDEC to max */
lbz r4, HSTATE_PTID(r13)
cmpwi r4, 0
bne 63f
lis r6,0x7fff /* MAX_INT@h */
mtspr SPRN_HDEC, r6
/* and set per-LPAR registers, if doing dynamic micro-threading */
ld r6, HSTATE_SPLIT_MODE(r13)
cmpdi r6, 0
beq 63f
ld r0, KVM_SPLIT_RPR(r6)
mtspr SPRN_RPR, r0
ld r0, KVM_SPLIT_PMMAR(r6)
mtspr SPRN_PMMAR, r0
ld r0, KVM_SPLIT_LDBAR(r6)
mtspr SPRN_LDBAR, r0
isync
63:
/* Order load of vcpu after load of vcore */
lwsync
ld r4, HSTATE_KVM_VCPU(r13)
bl kvmppc_hv_entry
/* Back from the guest, go back to nap */
/* Clear our vcpu and vcore pointers so we don't come back in early */
li r0, 0
std r0, HSTATE_KVM_VCPU(r13)
/*
* Once we clear HSTATE_KVM_VCORE(r13), the code in
* kvmppc_run_core() is going to assume that all our vcpu
* state is visible in memory. This lwsync makes sure
* that that is true.
*/
lwsync
std r0, HSTATE_KVM_VCORE(r13)
/*
* All secondaries exiting guest will fall through this path.
* Before proceeding, just check for HMI interrupt and
* invoke opal hmi handler. By now we are sure that the
* primary thread on this core/subcore has already made partition
* switch/TB resync and we are good to call opal hmi handler.
*/
cmpwi r12, BOOK3S_INTERRUPT_HMI
bne kvm_no_guest
li r3,0 /* NULL argument */
bl hmi_exception_realmode
/*
* At this point we have finished executing in the guest.
* We need to wait for hwthread_req to become zero, since
* we may not turn on the MMU while hwthread_req is non-zero.
* While waiting we also need to check if we get given a vcpu to run.
*/
kvm_no_guest:
lbz r3, HSTATE_HWTHREAD_REQ(r13)
cmpwi r3, 0
bne 53f
HMT_MEDIUM
li r0, KVM_HWTHREAD_IN_KERNEL
stb r0, HSTATE_HWTHREAD_STATE(r13)
/* need to recheck hwthread_req after a barrier, to avoid race */
sync
lbz r3, HSTATE_HWTHREAD_REQ(r13)
cmpwi r3, 0
bne 54f
/*
* Jump to idle_return_gpr_loss, which returns to the
* idle_kvm_start_guest caller.
*/
li r3, LPCR_PECE0
mfspr r4, SPRN_LPCR
rlwimi r4, r3, 0, LPCR_PECE0 | LPCR_PECE1
mtspr SPRN_LPCR, r4
// Return SRR1 wakeup value, or 0 if we went into the guest
ld r3, 32(r1)
REST_NVGPRS(r1)
ld r1, 0(r1) // Switch back to caller stack
ld r0, 16(r1) // Reload LR
ld r5, 8(r1) // Reload CR
mtlr r0
mtcr r5
blr
53:
HMT_LOW
ld r5, HSTATE_KVM_VCORE(r13)
cmpdi r5, 0
bne 60f
ld r3, HSTATE_SPLIT_MODE(r13)
cmpdi r3, 0
beq kvm_no_guest
lbz r0, KVM_SPLIT_DO_NAP(r3)
cmpwi r0, 0
beq kvm_no_guest
HMT_MEDIUM
b kvm_unsplit_nap
60: HMT_MEDIUM
b kvm_secondary_got_guest
54: li r0, KVM_HWTHREAD_IN_KVM
stb r0, HSTATE_HWTHREAD_STATE(r13)
b kvm_no_guest
/*
* Here the primary thread is trying to return the core to
* whole-core mode, so we need to nap.
*/
kvm_unsplit_nap:
/*
* When secondaries are napping in kvm_unsplit_nap() with
* hwthread_req = 1, HMI goes ignored even though subcores are
* already exited the guest. Hence HMI keeps waking up secondaries
* from nap in a loop and secondaries always go back to nap since
* no vcore is assigned to them. This makes impossible for primary
* thread to get hold of secondary threads resulting into a soft
* lockup in KVM path.
*
* Let us check if HMI is pending and handle it before we go to nap.
*/
cmpwi r12, BOOK3S_INTERRUPT_HMI
bne 55f
li r3, 0 /* NULL argument */
bl hmi_exception_realmode
55:
/*
* Ensure that secondary doesn't nap when it has
* its vcore pointer set.
*/
sync /* matches smp_mb() before setting split_info.do_nap */
ld r0, HSTATE_KVM_VCORE(r13)
cmpdi r0, 0
bne kvm_no_guest
/* clear any pending message */
BEGIN_FTR_SECTION
lis r6, (PPC_DBELL_SERVER << (63-36))@h
PPC_MSGCLR(6)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
/* Set kvm_split_mode.napped[tid] = 1 */
ld r3, HSTATE_SPLIT_MODE(r13)
li r0, 1
lhz r4, PACAPACAINDEX(r13)
clrldi r4, r4, 61 /* micro-threading => P8 => 8 threads/core */
addi r4, r4, KVM_SPLIT_NAPPED
stbx r0, r3, r4
/* Check the do_nap flag again after setting napped[] */
sync
lbz r0, KVM_SPLIT_DO_NAP(r3)
cmpwi r0, 0
beq 57f
li r3, NAPPING_UNSPLIT
stb r3, HSTATE_NAPPING(r13)
li r3, (LPCR_PECEDH | LPCR_PECE0) >> 4
mfspr r5, SPRN_LPCR
rlwimi r5, r3, 4, (LPCR_PECEDP | LPCR_PECEDH | LPCR_PECE0 | LPCR_PECE1)
b kvm_nap_sequence
57: li r0, 0
stbx r0, r3, r4
b kvm_no_guest
/******************************************************************************
* *
* Entry code *
* *
*****************************************************************************/
.global kvmppc_hv_entry
kvmppc_hv_entry:
/* Required state:
*
* R4 = vcpu pointer (or NULL)
* MSR = ~IR|DR
* R13 = PACA
* R1 = host R1
* R2 = TOC
* all other volatile GPRS = free
* Does not preserve non-volatile GPRs or CR fields
*/
mflr r0
std r0, PPC_LR_STKOFF(r1)
stdu r1, -SFS(r1)
/* Save R1 in the PACA */
std r1, HSTATE_HOST_R1(r13)
li r6, KVM_GUEST_MODE_HOST_HV
stb r6, HSTATE_IN_GUEST(r13)
#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
/* Store initial timestamp */
cmpdi r4, 0
beq 1f
addi r3, r4, VCPU_TB_RMENTRY
bl kvmhv_start_timing
1:
#endif
ld r5, HSTATE_KVM_VCORE(r13)
ld r9, VCORE_KVM(r5) /* pointer to struct kvm */
/*
* POWER7/POWER8 host -> guest partition switch code.
* We don't have to lock against concurrent tlbies,
* but we do have to coordinate across hardware threads.
*/
/* Set bit in entry map iff exit map is zero. */
li r7, 1
lbz r6, HSTATE_PTID(r13)
sld r7, r7, r6
addi r8, r5, VCORE_ENTRY_EXIT
21: lwarx r3, 0, r8
cmpwi r3, 0x100 /* any threads starting to exit? */
bge secondary_too_late /* if so we're too late to the party */
or r3, r3, r7
stwcx. r3, 0, r8
bne 21b
/* Primary thread switches to guest partition. */
cmpwi r6,0
bne 10f
lwz r7,KVM_LPID(r9)
ld r6,KVM_SDR1(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
/* See if we need to flush the TLB. */
mr r3, r9 /* kvm pointer */
lhz r4, PACAPACAINDEX(r13) /* physical cpu number */
li r5, 0 /* nested vcpu pointer */
bl kvmppc_check_need_tlb_flush
nop
ld r5, HSTATE_KVM_VCORE(r13)
/* Add timebase offset onto timebase */
22: ld r8,VCORE_TB_OFFSET(r5)
cmpdi r8,0
beq 37f
std r8, VCORE_TB_OFFSET_APPL(r5)
mftb r6 /* current host timebase */
add r8,r8,r6
mtspr SPRN_TBU40,r8 /* update upper 40 bits */
mftb r7 /* check if lower 24 bits overflowed */
clrldi r6,r6,40
clrldi r7,r7,40
cmpld r7,r6
bge 37f
addis r8,r8,0x100 /* if so, increment upper 40 bits */
mtspr SPRN_TBU40,r8
/* Load guest PCR value to select appropriate compat mode */
37: ld r7, VCORE_PCR(r5)
LOAD_REG_IMMEDIATE(r6, PCR_MASK)
cmpld r7, r6
beq 38f
or r7, r7, r6
mtspr SPRN_PCR, r7
38:
BEGIN_FTR_SECTION
/* DPDES and VTB are shared between threads */
ld r8, VCORE_DPDES(r5)
ld r7, VCORE_VTB(r5)
mtspr SPRN_DPDES, r8
mtspr SPRN_VTB, r7
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
/* Mark the subcore state as inside guest */
bl kvmppc_subcore_enter_guest
nop
ld r5, HSTATE_KVM_VCORE(r13)
ld r4, HSTATE_KVM_VCPU(r13)
li r0,1
stb r0,VCORE_IN_GUEST(r5) /* signal secondaries to continue */
/* Do we have a guest vcpu to run? */
10: cmpdi r4, 0
beq kvmppc_primary_no_guest
kvmppc_got_guest:
/* Increment yield count if they have a VPA */
ld r3, VCPU_VPA(r4)
cmpdi r3, 0
beq 25f
li r6, LPPACA_YIELDCOUNT
LWZX_BE r5, r3, r6
addi r5, r5, 1
STWX_BE r5, r3, r6
li r6, 1
stb r6, VCPU_VPA_DIRTY(r4)
25:
/* 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
/* Save host values of some registers */
BEGIN_FTR_SECTION
mfspr r5, SPRN_CIABR
mfspr r6, SPRN_DAWR0
mfspr r7, SPRN_DAWRX0
mfspr r8, SPRN_IAMR
std r5, STACK_SLOT_CIABR(r1)
std r6, STACK_SLOT_DAWR0(r1)
std r7, STACK_SLOT_DAWRX0(r1)
std r8, STACK_SLOT_IAMR(r1)
mfspr r5, SPRN_FSCR
std r5, STACK_SLOT_FSCR(r1)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
mfspr r5, SPRN_AMR
std r5, STACK_SLOT_AMR(r1)
mfspr r6, SPRN_UAMOR
std r6, STACK_SLOT_UAMOR(r1)
BEGIN_FTR_SECTION
/* Set partition DABR */
/* Do this before re-enabling PMU to avoid P7 DABR corruption bug */
lwz r5,VCPU_DABRX(r4)
ld r6,VCPU_DABR(r4)
mtspr SPRN_DABRX,r5
mtspr SPRN_DABR,r6
isync
END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
BEGIN_FTR_SECTION
b 91f
END_FTR_SECTION_IFCLR(CPU_FTR_TM)
/*
* NOTE THAT THIS TRASHES ALL NON-VOLATILE REGISTERS (but not CR)
*/
mr r3, r4
ld r4, VCPU_MSR(r3)
li r5, 0 /* don't preserve non-vol regs */
bl kvmppc_restore_tm_hv
nop
ld r4, HSTATE_KVM_VCPU(r13)
91:
#endif
/* Load guest PMU registers; r4 = vcpu pointer here */
mr r3, r4
bl kvmhv_load_guest_pmu
/* Load up FP, VMX and VSX registers */
ld r4, HSTATE_KVM_VCPU(r13)
bl kvmppc_load_fp
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)
/* Switch DSCR to guest value */
ld r5, VCPU_DSCR(r4)
mtspr SPRN_DSCR, r5
BEGIN_FTR_SECTION
/* Skip next section on POWER7 */
b 8f
END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
/* Load up POWER8-specific registers */
ld r5, VCPU_IAMR(r4)
lwz r6, VCPU_PSPB(r4)
ld r7, VCPU_FSCR(r4)
mtspr SPRN_IAMR, r5
mtspr SPRN_PSPB, r6
mtspr SPRN_FSCR, r7
/*
* Handle broken DAWR case by not writing it. This means we
* can still store the DAWR register for migration.
*/
LOAD_REG_ADDR(r5, dawr_force_enable)
lbz r5, 0(r5)
cmpdi r5, 0
beq 1f
ld r5, VCPU_DAWR0(r4)
ld r6, VCPU_DAWRX0(r4)
mtspr SPRN_DAWR0, r5
mtspr SPRN_DAWRX0, r6
1:
ld r7, VCPU_CIABR(r4)
ld r8, VCPU_TAR(r4)
mtspr SPRN_CIABR, r7
mtspr SPRN_TAR, r8
ld r5, VCPU_IC(r4)
ld r8, VCPU_EBBHR(r4)
mtspr SPRN_IC, r5
mtspr SPRN_EBBHR, r8
ld r5, VCPU_EBBRR(r4)
ld r6, VCPU_BESCR(r4)
lwz r7, VCPU_GUEST_PID(r4)
ld r8, VCPU_WORT(r4)
mtspr SPRN_EBBRR, r5
mtspr SPRN_BESCR, r6
mtspr SPRN_PID, r7
mtspr SPRN_WORT, r8
/* POWER8-only registers */
ld r5, VCPU_TCSCR(r4)
ld r6, VCPU_ACOP(r4)
ld r7, VCPU_CSIGR(r4)
ld r8, VCPU_TACR(r4)
mtspr SPRN_TCSCR, r5
mtspr SPRN_ACOP, r6
mtspr SPRN_CSIGR, r7
mtspr SPRN_TACR, r8
nop
8:
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
/* Load up DAR and DSISR */
ld r5, VCPU_DAR(r4)
lwz r6, VCPU_DSISR(r4)
mtspr SPRN_DAR, r5
mtspr SPRN_DSISR, r6
/* Restore AMR and UAMOR, set AMOR to all 1s */
ld r5,VCPU_AMR(r4)
ld r6,VCPU_UAMOR(r4)
mtspr SPRN_AMR,r5
mtspr SPRN_UAMOR,r6
/* Restore state of CTRL run bit; the host currently has it set to 1 */
lwz r5,VCPU_CTRL(r4)
andi. r5,r5,1
bne 4f
li r6,0
mtspr SPRN_CTRLT,r6
4:
/* Secondary threads wait for primary to have done partition switch */
ld r5, HSTATE_KVM_VCORE(r13)
lbz r6, HSTATE_PTID(r13)
cmpwi r6, 0
beq 21f
lbz r0, VCORE_IN_GUEST(r5)
cmpwi r0, 0
bne 21f
HMT_LOW
20: lwz r3, VCORE_ENTRY_EXIT(r5)
cmpwi r3, 0x100
bge no_switch_exit
lbz r0, VCORE_IN_GUEST(r5)
cmpwi r0, 0
beq 20b
HMT_MEDIUM
21:
/* Set LPCR. */
ld r8,VCORE_LPCR(r5)
mtspr SPRN_LPCR,r8
isync
/*
* Set the decrementer to the guest decrementer.
*/
ld r8,VCPU_DEC_EXPIRES(r4)
mftb r7
subf r3,r7,r8
mtspr SPRN_DEC,r3
/* Check if HDEC expires soon */
mfspr r3, SPRN_HDEC
extsw r3, r3
cmpdi r3, 512 /* 1 microsecond */
blt hdec_soon
/* Clear out and reload the SLB */
li r6, 0
slbmte r6, r6
PPC_SLBIA(6)
ptesync
/* Load up guest SLB entries (N.B. slb_max will be 0 for radix) */
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:
deliver_guest_interrupt: /* r4 = vcpu, r13 = paca */
/* Check if we can deliver an external or decrementer interrupt now */
ld r0, VCPU_PENDING_EXC(r4)
cmpdi r0, 0
beq 71f
mr r3, r4
bl kvmppc_guest_entry_inject_int
ld r4, HSTATE_KVM_VCPU(r13)
71:
ld r6, VCPU_SRR0(r4)
ld r7, VCPU_SRR1(r4)
mtspr SPRN_SRR0, r6
mtspr SPRN_SRR1, r7
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
ld r6, VCPU_CTR(r4)
ld r7, VCPU_XER(r4)
mtctr r6
mtxer r7
/*
* Required state:
* R4 = vcpu
* R10: value for HSRR0
* R11: value for HSRR1
* R13 = PACA
*/
fast_guest_return:
li r0,0
stb r0,VCPU_CEDED(r4) /* cancel cede */
mtspr SPRN_HSRR0,r10
mtspr SPRN_HSRR1,r11
/* Activate guest mode, so faults get handled by KVM */
li r9, KVM_GUEST_MODE_GUEST_HV
stb r9, HSTATE_IN_GUEST(r13)
#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
/* Accumulate timing */
addi r3, r4, VCPU_TB_GUEST
bl kvmhv_accumulate_time
#endif
/* Enter guest */
BEGIN_FTR_SECTION
ld r5, VCPU_CFAR(r4)
mtspr SPRN_CFAR, r5
END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
BEGIN_FTR_SECTION
ld r0, VCPU_PPR(r4)
END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
ld r5, VCPU_LR(r4)
mtlr r5
ld r1, VCPU_GPR(R1)(r4)
ld r5, VCPU_GPR(R5)(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)
BEGIN_FTR_SECTION
mtspr SPRN_PPR, r0
END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
ld r6, VCPU_GPR(R6)(r4)
ld r7, VCPU_GPR(R7)(r4)
ld r0, VCPU_CR(r4)
mtcr r0
ld r0, VCPU_GPR(R0)(r4)
ld r2, VCPU_GPR(R2)(r4)
ld r3, VCPU_GPR(R3)(r4)
ld r4, VCPU_GPR(R4)(r4)
HRFI_TO_GUEST
b .
secondary_too_late:
li r12, 0
stw r12, STACK_SLOT_TRAP(r1)
cmpdi r4, 0
beq 11f
stw r12, VCPU_TRAP(r4)
#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
addi r3, r4, VCPU_TB_RMEXIT
bl kvmhv_accumulate_time
#endif
11: b kvmhv_switch_to_host
no_switch_exit:
HMT_MEDIUM
li r12, 0
b 12f
hdec_soon:
li r12, BOOK3S_INTERRUPT_HV_DECREMENTER
12: stw r12, VCPU_TRAP(r4)
mr r9, r4
#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
addi r3, r4, VCPU_TB_RMEXIT
bl kvmhv_accumulate_time
#endif
b guest_bypass
/******************************************************************************
* *
* Exit code *
* *
*****************************************************************************/
/*
* We come here from the first-level interrupt handlers.
*/
.globl kvmppc_interrupt_hv
kvmppc_interrupt_hv:
/*
* Register contents:
* R9 = HSTATE_IN_GUEST
* R12 = (guest CR << 32) | interrupt vector
* R13 = PACA
* guest R12 saved in shadow VCPU SCRATCH0
* guest R13 saved in SPRN_SCRATCH0
* guest R9 saved in HSTATE_SCRATCH2
*/
/* We're now back in the host but in guest MMU context */
cmpwi r9,KVM_GUEST_MODE_HOST_HV
beq kvmppc_bad_host_intr
li r9, KVM_GUEST_MODE_HOST_HV
stb r9, HSTATE_IN_GUEST(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_SCRATCH2(r13)
std r0, VCPU_GPR(R9)(r9)
std r10, VCPU_GPR(R10)(r9)
std r11, VCPU_GPR(R11)(r9)
ld r3, HSTATE_SCRATCH0(r13)
std r3, VCPU_GPR(R12)(r9)
/* CR is in the high half of r12 */
srdi r4, r12, 32
std r4, VCPU_CR(r9)
BEGIN_FTR_SECTION
ld r3, HSTATE_CFAR(r13)
std r3, VCPU_CFAR(r9)
END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
BEGIN_FTR_SECTION
ld r4, HSTATE_PPR(r13)
std r4, VCPU_PPR(r9)
END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
/* Restore R1/R2 so we can handle faults */
ld r1, HSTATE_HOST_R1(r13)
LOAD_PACA_TOC()
mfspr r10, SPRN_SRR0
mfspr r11, SPRN_SRR1
std r10, VCPU_SRR0(r9)
std r11, VCPU_SRR1(r9)
/* trap is in the low half of r12, clear CR from the high half */
clrldi r12, r12, 32
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)
stw r12,VCPU_TRAP(r9)
/*
* Now that we have saved away SRR0/1 and HSRR0/1,
* interrupts are recoverable in principle, so set MSR_RI.
* This becomes important for relocation-on interrupts from
* the guest, which we can get in radix mode on POWER9.
*/
li r0, MSR_RI
mtmsrd r0, 1
#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
addi r3, r9, VCPU_TB_RMINTR
mr r4, r9
bl kvmhv_accumulate_time
ld r5, VCPU_GPR(R5)(r9)
ld r6, VCPU_GPR(R6)(r9)
ld r7, VCPU_GPR(R7)(r9)
ld r8, VCPU_GPR(R8)(r9)
#endif
/* Save HEIR (HV emulation assist reg) in emul_inst
if this is an HEI (HV emulation interrupt, e40) */
li r3,KVM_INST_FETCH_FAILED
stw r3,VCPU_LAST_INST(r9)
cmpwi r12,BOOK3S_INTERRUPT_H_EMUL_ASSIST
bne 11f
mfspr r3,SPRN_HEIR
11: stw r3,VCPU_HEIR(r9)
/* these are volatile across C function calls */
mfctr r3
mfxer r4
std r3, VCPU_CTR(r9)
std r4, VCPU_XER(r9)
/* Save more register state */
mfdar r3
mfdsisr r4
std r3, VCPU_DAR(r9)
stw r4, VCPU_DSISR(r9)
/* 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
std r3, VCPU_FAULT_DAR(r9)
stw r4, VCPU_FAULT_DSISR(r9)
cmpwi r12, BOOK3S_INTERRUPT_H_INST_STORAGE
beq kvmppc_hisi
/* See if this is a leftover HDEC interrupt */
cmpwi r12,BOOK3S_INTERRUPT_HV_DECREMENTER
bne 2f
mfspr r3,SPRN_HDEC
extsw r3, r3
cmpdi r3,0
mr r4,r9
bge fast_guest_return
2:
/* See if this is an hcall we can handle in real mode */
cmpwi r12,BOOK3S_INTERRUPT_SYSCALL
beq hcall_try_real_mode
/* Hypervisor doorbell - exit only if host IPI flag set */
cmpwi r12, BOOK3S_INTERRUPT_H_DOORBELL
bne 3f
lbz r0, HSTATE_HOST_IPI(r13)
cmpwi r0, 0
beq maybe_reenter_guest
b guest_exit_cont
3:
/* If it's a hypervisor facility unavailable interrupt, save HFSCR */
cmpwi r12, BOOK3S_INTERRUPT_H_FAC_UNAVAIL
bne 14f
mfspr r3, SPRN_HFSCR
std r3, VCPU_HFSCR(r9)
b guest_exit_cont
14:
/* External interrupt ? */
cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL
beq kvmppc_guest_external
/* See if it is a machine check */
cmpwi r12, BOOK3S_INTERRUPT_MACHINE_CHECK
beq machine_check_realmode
/* Or a hypervisor maintenance interrupt */
cmpwi r12, BOOK3S_INTERRUPT_HMI
beq hmi_realmode
guest_exit_cont: /* r9 = vcpu, r12 = trap, r13 = paca */
#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
addi r3, r9, VCPU_TB_RMEXIT
mr r4, r9
bl kvmhv_accumulate_time
#endif
/*
* Possibly flush the link stack here, before we do a blr in
* kvmhv_switch_to_host.
*/
1: nop
patch_site 1b patch__call_kvm_flush_link_stack
/* For hash guest, read the guest SLB and save it away */
li r5, 0
lwz r0,VCPU_SLB_NR(r9) /* number of entries in SLB */
mtctr r0
li r6,0
addi r7,r9,VCPU_SLB
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
/* Finally clear out the SLB */
li r0,0
slbmte r0,r0
PPC_SLBIA(6)
ptesync
stw r5,VCPU_SLB_MAX(r9)
/* load host SLB entries */
ld r8,PACA_SLBSHADOWPTR(r13)
.rept SLB_NUM_BOLTED
li r3, SLBSHADOW_SAVEAREA
LDX_BE r5, r8, r3
addi r3, r3, 8
LDX_BE r6, r8, r3
andis. r7,r5,SLB_ESID_V@h
beq 1f
slbmte r6,r5
1: addi r8,r8,16
.endr
guest_bypass:
stw r12, STACK_SLOT_TRAP(r1)
/* Save DEC */
/* Do this before kvmhv_commence_exit so we know TB is guest TB */
ld r3, HSTATE_KVM_VCORE(r13)
mfspr r5,SPRN_DEC
mftb r6
extsw r5,r5
16: add r5,r5,r6
std r5,VCPU_DEC_EXPIRES(r9)
/* Increment exit count, poke other threads to exit */
mr r3, r12
bl kvmhv_commence_exit
nop
ld r9, HSTATE_KVM_VCPU(r13)
/* Stop others sending VCPU interrupts to this physical CPU */
li r0, -1
stw r0, VCPU_CPU(r9)
stw r0, VCPU_THREAD_CPU(r9)
/* Save guest CTRL register, set runlatch to 1 if it was clear */
mfspr r6,SPRN_CTRLF
stw r6,VCPU_CTRL(r9)
andi. r0,r6,1
bne 4f
li r6,1
mtspr SPRN_CTRLT,r6
4:
/*
* Save the guest PURR/SPURR
*/
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
BEGIN_FTR_SECTION
b 8f
END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
/* Save POWER8-specific registers */
mfspr r5, SPRN_IAMR
mfspr r6, SPRN_PSPB
mfspr r7, SPRN_FSCR
std r5, VCPU_IAMR(r9)
stw r6, VCPU_PSPB(r9)
std r7, VCPU_FSCR(r9)
mfspr r5, SPRN_IC
mfspr r7, SPRN_TAR
std r5, VCPU_IC(r9)
std r7, VCPU_TAR(r9)
mfspr r8, SPRN_EBBHR
std r8, VCPU_EBBHR(r9)
mfspr r5, SPRN_EBBRR
mfspr r6, SPRN_BESCR
mfspr r7, SPRN_PID
mfspr r8, SPRN_WORT
std r5, VCPU_EBBRR(r9)
std r6, VCPU_BESCR(r9)
stw r7, VCPU_GUEST_PID(r9)
std r8, VCPU_WORT(r9)
mfspr r5, SPRN_TCSCR
mfspr r6, SPRN_ACOP
mfspr r7, SPRN_CSIGR
mfspr r8, SPRN_TACR
std r5, VCPU_TCSCR(r9)
std r6, VCPU_ACOP(r9)
std r7, VCPU_CSIGR(r9)
std r8, VCPU_TACR(r9)
BEGIN_FTR_SECTION
ld r5, STACK_SLOT_FSCR(r1)
mtspr SPRN_FSCR, r5
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
/*
* Restore various registers to 0, where non-zero values
* set by the guest could disrupt the host.
*/
li r0, 0
mtspr SPRN_PSPB, r0
mtspr SPRN_WORT, r0
mtspr SPRN_TCSCR, r0
/* Set MMCRS to 1<<31 to freeze and disable the SPMC counters */
li r0, 1
sldi r0, r0, 31
mtspr SPRN_MMCRS, r0
/* Save and restore AMR, IAMR and UAMOR before turning on the MMU */
ld r8, STACK_SLOT_IAMR(r1)
mtspr SPRN_IAMR, r8
8: /* Power7 jumps back in here */
mfspr r5,SPRN_AMR
mfspr r6,SPRN_UAMOR
std r5,VCPU_AMR(r9)
std r6,VCPU_UAMOR(r9)
ld r5,STACK_SLOT_AMR(r1)
ld r6,STACK_SLOT_UAMOR(r1)
mtspr SPRN_AMR, r5
mtspr SPRN_UAMOR, r6
/* Switch DSCR back to host value */
mfspr r8, SPRN_DSCR
ld r7, HSTATE_DSCR(r13)
std r8, VCPU_DSCR(r9)
mtspr SPRN_DSCR, r7
/* 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)
/* save FP state */
mr r3, r9
bl kvmppc_save_fp
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
BEGIN_FTR_SECTION
b 91f
END_FTR_SECTION_IFCLR(CPU_FTR_TM)
/*
* NOTE THAT THIS TRASHES ALL NON-VOLATILE REGISTERS (but not CR)
*/
mr r3, r9
ld r4, VCPU_MSR(r3)
li r5, 0 /* don't preserve non-vol regs */
bl kvmppc_save_tm_hv
nop
ld r9, HSTATE_KVM_VCPU(r13)
91:
#endif
/* Increment yield count if they have a VPA */
ld r8, VCPU_VPA(r9) /* do they have a VPA? */
cmpdi r8, 0
beq 25f
li r4, LPPACA_YIELDCOUNT
LWZX_BE r3, r8, r4
addi r3, r3, 1
STWX_BE r3, r8, r4
li r3, 1
stb r3, VCPU_VPA_DIRTY(r9)
25:
/* Save PMU registers if requested */
/* r8 and cr0.eq are live here */
mr r3, r9
li r4, 1
beq 21f /* if no VPA, save PMU stuff anyway */
lbz r4, LPPACA_PMCINUSE(r8)
21: bl kvmhv_save_guest_pmu
ld r9, HSTATE_KVM_VCPU(r13)
/* Restore host values of some registers */
BEGIN_FTR_SECTION
ld r5, STACK_SLOT_CIABR(r1)
ld r6, STACK_SLOT_DAWR0(r1)
ld r7, STACK_SLOT_DAWRX0(r1)
mtspr SPRN_CIABR, r5
/*
* If the DAWR doesn't work, it's ok to write these here as
* this value should always be zero
*/
mtspr SPRN_DAWR0, r6
mtspr SPRN_DAWRX0, r7
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
/*
* POWER7/POWER8 guest -> host partition switch code.
* We don't have to lock against tlbies but we do
* have to coordinate the hardware threads.
* Here STACK_SLOT_TRAP(r1) contains the trap number.
*/
kvmhv_switch_to_host:
/* Secondary threads wait for primary to do partition switch */
ld r5,HSTATE_KVM_VCORE(r13)
ld r4,VCORE_KVM(r5) /* pointer to struct kvm */
lbz r3,HSTATE_PTID(r13)
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)
rlwinm r0,r3,32-8,0xff
clrldi r3,r3,56
cmpw r3,r0
bne 15b
isync
/* Did we actually switch to the guest at all? */
lbz r6, VCORE_IN_GUEST(r5)
cmpwi r6, 0
beq 19f
/* Primary thread switches back to host partition */
lwz r7,KVM_HOST_LPID(r4)
ld r6,KVM_HOST_SDR1(r4)
li r8,LPID_RSVD /* switch to reserved LPID */
mtspr SPRN_LPID,r8
ptesync
mtspr SPRN_SDR1,r6 /* switch to host page table */
mtspr SPRN_LPID,r7
isync
BEGIN_FTR_SECTION
/* DPDES and VTB are shared between threads */
mfspr r7, SPRN_DPDES
mfspr r8, SPRN_VTB
std r7, VCORE_DPDES(r5)
std r8, VCORE_VTB(r5)
/* clear DPDES so we don't get guest doorbells in the host */
li r8, 0
mtspr SPRN_DPDES, r8
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
/* Subtract timebase offset from timebase */
ld r8, VCORE_TB_OFFSET_APPL(r5)
cmpdi r8,0
beq 17f
li r0, 0
std r0, VCORE_TB_OFFSET_APPL(r5)
mftb r6 /* current guest timebase */
subf r8,r8,r6
mtspr SPRN_TBU40,r8 /* update upper 40 bits */
mftb r7 /* check if lower 24 bits overflowed */
clrldi r6,r6,40
clrldi r7,r7,40
cmpld r7,r6
bge 17f
addis r8,r8,0x100 /* if so, increment upper 40 bits */
mtspr SPRN_TBU40,r8
17:
/*
* If this is an HMI, we called kvmppc_realmode_hmi_handler
* above, which may or may not have already called
* kvmppc_subcore_exit_guest. Fortunately, all that
* kvmppc_subcore_exit_guest does is clear a flag, so calling
* it again here is benign even if kvmppc_realmode_hmi_handler
* has already called it.
*/
bl kvmppc_subcore_exit_guest
nop
30: ld r5,HSTATE_KVM_VCORE(r13)
ld r4,VCORE_KVM(r5) /* pointer to struct kvm */
/* Reset PCR */
ld r0, VCORE_PCR(r5)
LOAD_REG_IMMEDIATE(r6, PCR_MASK)
cmpld r0, r6
beq 18f
mtspr SPRN_PCR, r6
18:
/* Signal secondary CPUs to continue */
li r0, 0
stb r0,VCORE_IN_GUEST(r5)
19: lis r8,0x7fff /* MAX_INT@h */
mtspr SPRN_HDEC,r8
16: ld r8,KVM_HOST_LPCR(r4)
mtspr SPRN_LPCR,r8
isync
#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
/* Finish timing, if we have a vcpu */
ld r4, HSTATE_KVM_VCPU(r13)
cmpdi r4, 0
li r3, 0
beq 2f
bl kvmhv_accumulate_time
2:
#endif
/* Unset guest mode */
li r0, KVM_GUEST_MODE_NONE
stb r0, HSTATE_IN_GUEST(r13)
lwz r12, STACK_SLOT_TRAP(r1) /* return trap # in r12 */
ld r0, SFS+PPC_LR_STKOFF(r1)
addi r1, r1, SFS
mtlr r0
blr
.balign 32
.global kvm_flush_link_stack
kvm_flush_link_stack:
/* Save LR into r0 */
mflr r0
/* Flush the link stack. On Power8 it's up to 32 entries in size. */
.rept 32
bl .+4
.endr
/* And on Power9 it's up to 64. */
BEGIN_FTR_SECTION
.rept 32
bl .+4
.endr
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
/* Restore LR */
mtlr r0
blr
kvmppc_guest_external:
/* External interrupt, first check for host_ipi. If this is
* set, we know the host wants us out so let's do it now
*/
bl kvmppc_read_intr
/*
* Restore the active volatile registers after returning from
* a C function.
*/
ld r9, HSTATE_KVM_VCPU(r13)
li r12, BOOK3S_INTERRUPT_EXTERNAL
/*
* kvmppc_read_intr return codes:
*
* Exit to host (r3 > 0)
* 1 An interrupt is pending that needs to be handled by the host
* Exit guest and return to host by branching to guest_exit_cont
*
* 2 Passthrough that needs completion in the host
* Exit guest and return to host by branching to guest_exit_cont
* However, we also set r12 to BOOK3S_INTERRUPT_HV_RM_HARD
* to indicate to the host to complete handling the interrupt
*
* Before returning to guest, we check if any CPU is heading out
* to the host and if so, we head out also. If no CPUs are heading
* check return values <= 0.
*
* Return to guest (r3 <= 0)
* 0 No external interrupt is pending
* -1 A guest wakeup IPI (which has now been cleared)
* In either case, we return to guest to deliver any pending
* guest interrupts.
*
* -2 A PCI passthrough external interrupt was handled
* (interrupt was delivered directly to guest)
* Return to guest to deliver any pending guest interrupts.
*/
cmpdi r3, 1
ble 1f
/* Return code = 2 */
li r12, BOOK3S_INTERRUPT_HV_RM_HARD
stw r12, VCPU_TRAP(r9)
b guest_exit_cont
1: /* Return code <= 1 */
cmpdi r3, 0
bgt guest_exit_cont
/* Return code <= 0 */
maybe_reenter_guest:
ld r5, HSTATE_KVM_VCORE(r13)
lwz r0, VCORE_ENTRY_EXIT(r5)
cmpwi r0, 0x100
mr r4, r9
blt deliver_guest_interrupt
b guest_exit_cont
/*
* 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 or protection fault? */
andis. r0, r6, (DSISR_NOHPTE | DSISR_PROTFAULT)@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 */
li r0, BOOK3S_INTERRUPT_DATA_SEGMENT
bne 7f /* 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 */
li r7, 1 /* data fault */
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 guest_exit_cont
cmpdi r3, -2 /* MMIO emulation; need instr word */
beq 2f
/* Synthesize a DSI (or DSegI) for the guest */
ld r4, VCPU_FAULT_DAR(r9)
mr r6, r3
1: li r0, BOOK3S_INTERRUPT_DATA_STORAGE
mtspr SPRN_DSISR, r6
7: mtspr SPRN_DAR, r4
mtspr SPRN_SRR0, r10
mtspr SPRN_SRR1, r11
mr r10, r0
bl kvmppc_msr_interrupt
fast_interrupt_c_return:
6: ld r7, VCPU_CTR(r9)
ld 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_HOST_HV
stb r0, HSTATE_IN_GUEST(r13)
b guest_exit_cont
/*
* Similarly for an HISI, reflect it to the guest as an ISI unless
* it is an HPTE not found fault for a page that we have paged out.
*/
kvmppc_hisi:
andis. r0, r11, SRR1_ISI_NOPT@h
beq 1f
andi. r0, r11, MSR_IR /* instruction relocation enabled? */
beq 3f
clrrdi r0, r10, 28
PPC_SLBFEE_DOT(R5, R0) /* if so, look up SLB */
li r0, BOOK3S_INTERRUPT_INST_SEGMENT
bne 7f /* if no SLB entry found */
4:
/* Search the hash table. */
mr r3, r9 /* vcpu pointer */
mr r4, r10
mr r6, r11
li r7, 0 /* instruction fault */
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_INST_STORAGE
cmpdi r3, 0 /* retry the instruction */
beq fast_interrupt_c_return
cmpdi r3, -1 /* handle in kernel mode */
beq guest_exit_cont
/* Synthesize an ISI (or ISegI) for the guest */
mr r11, r3
1: li r0, BOOK3S_INTERRUPT_INST_STORAGE
7: mtspr SPRN_SRR0, r10
mtspr SPRN_SRR1, r11
mr r10, r0
bl kvmppc_msr_interrupt
b fast_interrupt_c_return
3: ld r6, VCPU_KVM(r9) /* not relocated, use VRMA */
ld r5, KVM_VRMA_SLB_V(r6)
b 4b
/*
* 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).
*
* r5 - r8 contain hcall args,
* r9 = vcpu, r10 = pc, r11 = msr, r12 = trap, r13 = paca
*/
hcall_try_real_mode:
ld r3,VCPU_GPR(R3)(r9)
andi. r0,r11,MSR_PR
/* sc 1 from userspace - reflect to guest syscall */
bne sc_1_fast_return
clrrdi r3,r3,2
cmpldi r3,hcall_real_table_end - hcall_real_table
bge guest_exit_cont
/* See if this hcall is enabled for in-kernel handling */
ld r4, VCPU_KVM(r9)
srdi r0, r3, 8 /* r0 = (r3 / 4) >> 6 */
sldi r0, r0, 3 /* index into kvm->arch.enabled_hcalls[] */
add r4, r4, r0
ld r0, KVM_ENABLED_HCALLS(r4)
rlwinm r4, r3, 32-2, 0x3f /* r4 = (r3 / 4) & 0x3f */
srd r0, r0, r4
andi. r0, r0, 1
beq guest_exit_cont
/* Get pointer to handler, if any, and call it */
LOAD_REG_ADDR(r4, hcall_real_table)
lwax r3,r3,r4
cmpwi r3,0
beq guest_exit_cont
add r12,r3,r4
mtctr r12
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
sc_1_fast_return:
mtspr SPRN_SRR0,r10
mtspr SPRN_SRR1,r11
li r10, BOOK3S_INTERRUPT_SYSCALL
bl kvmppc_msr_interrupt
mr r4,r9
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 guest_exit_cont
.globl hcall_real_table
hcall_real_table:
.long 0 /* 0 - unused */
.long DOTSYM(kvmppc_h_remove) - hcall_real_table
.long DOTSYM(kvmppc_h_enter) - hcall_real_table
.long DOTSYM(kvmppc_h_read) - hcall_real_table
.long DOTSYM(kvmppc_h_clear_mod) - hcall_real_table
.long DOTSYM(kvmppc_h_clear_ref) - hcall_real_table
.long DOTSYM(kvmppc_h_protect) - hcall_real_table
.long 0 /* 0x1c */
.long 0 /* 0x20 */
.long 0 /* 0x24 - H_SET_SPRG0 */
.long DOTSYM(kvmppc_h_set_dabr) - hcall_real_table
.long DOTSYM(kvmppc_rm_h_page_init) - hcall_real_table
.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 */
#ifdef CONFIG_KVM_XICS
.long DOTSYM(xics_rm_h_eoi) - hcall_real_table
.long DOTSYM(xics_rm_h_cppr) - hcall_real_table
.long DOTSYM(xics_rm_h_ipi) - hcall_real_table
.long 0 /* 0x70 - H_IPOLL */
.long DOTSYM(xics_rm_h_xirr) - hcall_real_table
#else
.long 0 /* 0x64 - H_EOI */
.long 0 /* 0x68 - H_CPPR */
.long 0 /* 0x6c - H_IPI */
.long 0 /* 0x70 - H_IPOLL */
.long 0 /* 0x74 - H_XIRR */
#endif
.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 DOTSYM(kvmppc_h_cede) - hcall_real_table
.long DOTSYM(kvmppc_rm_h_confer) - hcall_real_table
.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 DOTSYM(kvmppc_h_bulk_remove) - hcall_real_table
.long 0 /* 0x128 */
.long 0 /* 0x12c */
.long 0 /* 0x130 */
.long DOTSYM(kvmppc_h_set_xdabr) - hcall_real_table
.long 0 /* 0x138 */
.long 0 /* 0x13c */
.long 0 /* 0x140 */
.long 0 /* 0x144 */
.long 0 /* 0x148 */
.long 0 /* 0x14c */
.long 0 /* 0x150 */
.long 0 /* 0x154 */
.long 0 /* 0x158 */
.long 0 /* 0x15c */
.long 0 /* 0x160 */
.long 0 /* 0x164 */
.long 0 /* 0x168 */
.long 0 /* 0x16c */
.long 0 /* 0x170 */
.long 0 /* 0x174 */
.long 0 /* 0x178 */
.long 0 /* 0x17c */
.long 0 /* 0x180 */
.long 0 /* 0x184 */
.long 0 /* 0x188 */
.long 0 /* 0x18c */
.long 0 /* 0x190 */
.long 0 /* 0x194 */
.long 0 /* 0x198 */
.long 0 /* 0x19c */
.long 0 /* 0x1a0 */
.long 0 /* 0x1a4 */
.long 0 /* 0x1a8 */
.long 0 /* 0x1ac */
.long 0 /* 0x1b0 */
.long 0 /* 0x1b4 */
.long 0 /* 0x1b8 */
.long 0 /* 0x1bc */
.long 0 /* 0x1c0 */
.long 0 /* 0x1c4 */
.long 0 /* 0x1c8 */
.long 0 /* 0x1cc */
.long 0 /* 0x1d0 */
.long 0 /* 0x1d4 */
.long 0 /* 0x1d8 */
.long 0 /* 0x1dc */
.long 0 /* 0x1e0 */
.long 0 /* 0x1e4 */
.long 0 /* 0x1e8 */
.long 0 /* 0x1ec */
.long 0 /* 0x1f0 */
.long 0 /* 0x1f4 */
.long 0 /* 0x1f8 */
.long 0 /* 0x1fc */
.long 0 /* 0x200 */
.long 0 /* 0x204 */
.long 0 /* 0x208 */
.long 0 /* 0x20c */
.long 0 /* 0x210 */
.long 0 /* 0x214 */
.long 0 /* 0x218 */
.long 0 /* 0x21c */
.long 0 /* 0x220 */
.long 0 /* 0x224 */
.long 0 /* 0x228 */
.long 0 /* 0x22c */
.long 0 /* 0x230 */
.long 0 /* 0x234 */
.long 0 /* 0x238 */
.long 0 /* 0x23c */
.long 0 /* 0x240 */
.long 0 /* 0x244 */
.long 0 /* 0x248 */
.long 0 /* 0x24c */
.long 0 /* 0x250 */
.long 0 /* 0x254 */
.long 0 /* 0x258 */
.long 0 /* 0x25c */
.long 0 /* 0x260 */
.long 0 /* 0x264 */
.long 0 /* 0x268 */
.long 0 /* 0x26c */
.long 0 /* 0x270 */
.long 0 /* 0x274 */
.long 0 /* 0x278 */
.long 0 /* 0x27c */
.long 0 /* 0x280 */
.long 0 /* 0x284 */
.long 0 /* 0x288 */
.long 0 /* 0x28c */
.long 0 /* 0x290 */
.long 0 /* 0x294 */
.long 0 /* 0x298 */
.long 0 /* 0x29c */
.long 0 /* 0x2a0 */
.long 0 /* 0x2a4 */
.long 0 /* 0x2a8 */
.long 0 /* 0x2ac */
.long 0 /* 0x2b0 */
.long 0 /* 0x2b4 */
.long 0 /* 0x2b8 */
.long 0 /* 0x2bc */
.long 0 /* 0x2c0 */
.long 0 /* 0x2c4 */
.long 0 /* 0x2c8 */
.long 0 /* 0x2cc */
.long 0 /* 0x2d0 */
.long 0 /* 0x2d4 */
.long 0 /* 0x2d8 */
.long 0 /* 0x2dc */
.long 0 /* 0x2e0 */
.long 0 /* 0x2e4 */
.long 0 /* 0x2e8 */
.long 0 /* 0x2ec */
.long 0 /* 0x2f0 */
.long 0 /* 0x2f4 */
.long 0 /* 0x2f8 */
#ifdef CONFIG_KVM_XICS
.long DOTSYM(xics_rm_h_xirr_x) - hcall_real_table
#else
.long 0 /* 0x2fc - H_XIRR_X*/
#endif
.long DOTSYM(kvmppc_rm_h_random) - hcall_real_table
.globl hcall_real_table_end
hcall_real_table_end:
_GLOBAL_TOC(kvmppc_h_set_xdabr)
EXPORT_SYMBOL_GPL(kvmppc_h_set_xdabr)
andi. r0, r5, DABRX_USER | DABRX_KERNEL
beq 6f
li r0, DABRX_USER | DABRX_KERNEL | DABRX_BTI
andc. r0, r5, r0
beq 3f
6: li r3, H_PARAMETER
blr
_GLOBAL_TOC(kvmppc_h_set_dabr)
EXPORT_SYMBOL_GPL(kvmppc_h_set_dabr)
li r5, DABRX_USER | DABRX_KERNEL
3:
BEGIN_FTR_SECTION
b 2f
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
std r4,VCPU_DABR(r3)
stw r5, VCPU_DABRX(r3)
mtspr SPRN_DABRX, r5
/* Work around P7 bug where DABR can get corrupted on mtspr */
1: mtspr SPRN_DABR,r4
mfspr r5, SPRN_DABR
cmpd r4, r5
bne 1b
isync
li r3,0
blr
2:
LOAD_REG_ADDR(r11, dawr_force_enable)
lbz r11, 0(r11)
cmpdi r11, 0
bne 3f
li r3, H_HARDWARE
blr
3:
/* Emulate H_SET_DABR/X on P8 for the sake of compat mode guests */
rlwimi r5, r4, 5, DAWRX_DR | DAWRX_DW
rlwimi r5, r4, 2, DAWRX_WT
clrrdi r4, r4, 3
std r4, VCPU_DAWR0(r3)
std r5, VCPU_DAWRX0(r3)
/*
* If came in through the real mode hcall handler then it is necessary
* to write the registers since the return path won't. Otherwise it is
* sufficient to store then in the vcpu struct as they will be loaded
* next time the vcpu is run.
*/
mfmsr r6
andi. r6, r6, MSR_DR /* in real mode? */
bne 4f
mtspr SPRN_DAWR0, r4
mtspr SPRN_DAWRX0, r5
4: li r3, 0
blr
_GLOBAL(kvmppc_h_cede) /* r3 = vcpu pointer, r11 = msr, r13 = paca */
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 kvm_cede_prodded
li r12,0 /* set trap to 0 to say hcall is handled */
stw r12,VCPU_TRAP(r3)
li r0,H_SUCCESS
std r0,VCPU_GPR(R3)(r3)
/*
* 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)
lbz r6,HSTATE_PTID(r13)
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
cmpw r4,r8
beq kvm_cede_exit
stwcx. r4,0,r6
bne 31b
/* order napping_threads update vs testing entry_exit_map */
isync
li r0,NAPPING_CEDE
stb r0,HSTATE_NAPPING(r13)
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
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
BEGIN_FTR_SECTION
b 91f
END_FTR_SECTION_IFCLR(CPU_FTR_TM)
/*
* NOTE THAT THIS TRASHES ALL NON-VOLATILE REGISTERS (but not CR)
*/
ld r3, HSTATE_KVM_VCPU(r13)
ld r4, VCPU_MSR(r3)
li r5, 0 /* don't preserve non-vol regs */
bl kvmppc_save_tm_hv
nop
91:
#endif
/*
* Set DEC to the smaller of DEC and HDEC, so that we wake
* no later than the end of our timeslice (HDEC interrupts
* don't wake us from nap).
*/
mfspr r3, SPRN_DEC
mfspr r4, SPRN_HDEC
mftb r5
extsw r3, r3
extsw r4, r4
cmpd r3, r4
ble 67f
mtspr SPRN_DEC, r4
67:
/* save expiry time of guest decrementer */
add r3, r3, r5
ld r4, HSTATE_KVM_VCPU(r13)
std r3, VCPU_DEC_EXPIRES(r4)
#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
ld r4, HSTATE_KVM_VCPU(r13)
addi r3, r4, VCPU_TB_CEDE
bl kvmhv_accumulate_time
#endif
lis r3, LPCR_PECEDP@h /* Do wake on privileged doorbell */
/* Go back to host stack */
ld r1, HSTATE_HOST_R1(r13)
/*
* Take a nap until a decrementer or external or doobell interrupt
* occurs, with PECE1 and PECE0 set in LPCR.
* On POWER8, set PECEDH, and if we are ceding, also set PECEDP.
* Also clear the runlatch bit before napping.
*/
kvm_do_nap:
li r0,0
mtspr SPRN_CTRLT, r0
li r0,1
stb r0,HSTATE_HWTHREAD_REQ(r13)
mfspr r5,SPRN_LPCR
ori r5,r5,LPCR_PECE0 | LPCR_PECE1
BEGIN_FTR_SECTION
ori r5, r5, LPCR_PECEDH
rlwimi r5, r3, 0, LPCR_PECEDP
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
kvm_nap_sequence: /* desired LPCR value in r5 */
li r3, PNV_THREAD_NAP
mtspr SPRN_LPCR,r5
isync
bl isa206_idle_insn_mayloss
li r0,1
mtspr SPRN_CTRLT, r0
mtspr SPRN_SRR1, r3
li r0, 0
stb r0, PACA_FTRACE_ENABLED(r13)
li r0, KVM_HWTHREAD_IN_KVM
stb r0, HSTATE_HWTHREAD_STATE(r13)
lbz r0, HSTATE_NAPPING(r13)
cmpwi r0, NAPPING_CEDE
beq kvm_end_cede
cmpwi r0, NAPPING_NOVCPU
beq kvm_novcpu_wakeup
cmpwi r0, NAPPING_UNSPLIT
beq kvm_unsplit_wakeup
twi 31,0,0 /* Nap state must not be zero */
33: mr r4, r3
li r3, 0
li r12, 0
b 34f
kvm_end_cede:
/* Woken by external or decrementer interrupt */
/* get vcpu pointer */
ld r4, HSTATE_KVM_VCPU(r13)
#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
addi r3, r4, VCPU_TB_RMINTR
bl kvmhv_accumulate_time
#endif
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
BEGIN_FTR_SECTION
b 91f
END_FTR_SECTION_IFCLR(CPU_FTR_TM)
/*
* NOTE THAT THIS TRASHES ALL NON-VOLATILE REGISTERS (but not CR)
*/
mr r3, r4
ld r4, VCPU_MSR(r3)
li r5, 0 /* don't preserve non-vol regs */
bl kvmppc_restore_tm_hv
nop
ld r4, HSTATE_KVM_VCPU(r13)
91:
#endif
/* load up FP state */
bl kvmppc_load_fp
/* Restore guest decrementer */
ld r3, VCPU_DEC_EXPIRES(r4)
mftb r7
subf r3, r7, r3
mtspr SPRN_DEC, r3
/* 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)
/* Check the wake reason in SRR1 to see why we got here */
bl kvmppc_check_wake_reason
/*
* Restore volatile registers since we could have called a
* C routine in kvmppc_check_wake_reason
* r4 = VCPU
* r3 tells us whether we need to return to host or not
* WARNING: it gets checked further down:
* should not modify r3 until this check is done.
*/
ld r4, HSTATE_KVM_VCPU(r13)
/* clear our bit in vcore->napping_threads */
34: ld r5,HSTATE_KVM_VCORE(r13)
lbz r7,HSTATE_PTID(r13)
li r0,1
sld r0,r0,r7
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 the wake reason saved in r3 means we need to exit */
stw r12, VCPU_TRAP(r4)
mr r9, r4
cmpdi r3, 0
bgt guest_exit_cont
b maybe_reenter_guest
/* cede when already previously prodded case */
kvm_cede_prodded:
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 */
kvm_cede_exit:
ld r9, HSTATE_KVM_VCPU(r13)
b guest_exit_cont
/* Try to do machine check recovery in real mode */
machine_check_realmode:
mr r3, r9 /* get vcpu pointer */
bl kvmppc_realmode_machine_check
nop
/* all machine checks go to virtual mode for further handling */
ld r9, HSTATE_KVM_VCPU(r13)
li r12, BOOK3S_INTERRUPT_MACHINE_CHECK
b guest_exit_cont
/*
* Call C code to handle a HMI in real mode.
* Only the primary thread does the call, secondary threads are handled
* by calling hmi_exception_realmode() after kvmppc_hv_entry returns.
* r9 points to the vcpu on entry
*/
hmi_realmode:
lbz r0, HSTATE_PTID(r13)
cmpwi r0, 0
bne guest_exit_cont
bl kvmppc_realmode_hmi_handler
ld r9, HSTATE_KVM_VCPU(r13)
li r12, BOOK3S_INTERRUPT_HMI
b guest_exit_cont
/*
* Check the reason we woke from nap, and take appropriate action.
* Returns (in r3):
* 0 if nothing needs to be done
* 1 if something happened that needs to be handled by the host
* -1 if there was a guest wakeup (IPI or msgsnd)
* -2 if we handled a PCI passthrough interrupt (returned by
* kvmppc_read_intr only)
*
* Also sets r12 to the interrupt vector for any interrupt that needs
* to be handled now by the host (0x500 for external interrupt), or zero.
* Modifies all volatile registers (since it may call a C function).
* This routine calls kvmppc_read_intr, a C function, if an external
* interrupt is pending.
*/
kvmppc_check_wake_reason:
mfspr r6, SPRN_SRR1
BEGIN_FTR_SECTION
rlwinm r6, r6, 45-31, 0xf /* extract wake reason field (P8) */
FTR_SECTION_ELSE
rlwinm r6, r6, 45-31, 0xe /* P7 wake reason field is 3 bits */
ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_207S)
cmpwi r6, 8 /* was it an external interrupt? */
beq 7f /* if so, see what it was */
li r3, 0
li r12, 0
cmpwi r6, 6 /* was it the decrementer? */
beq 0f
BEGIN_FTR_SECTION
cmpwi r6, 5 /* privileged doorbell? */
beq 0f
cmpwi r6, 3 /* hypervisor doorbell? */
beq 3f
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
cmpwi r6, 0xa /* Hypervisor maintenance ? */
beq 4f
li r3, 1 /* anything else, return 1 */
0: blr
/* hypervisor doorbell */
3: li r12, BOOK3S_INTERRUPT_H_DOORBELL
/*
* Clear the doorbell as we will invoke the handler
* explicitly in the guest exit path.
*/
lis r6, (PPC_DBELL_SERVER << (63-36))@h
PPC_MSGCLR(6)
/* see if it's a host IPI */
li r3, 1
lbz r0, HSTATE_HOST_IPI(r13)
cmpwi r0, 0
bnelr
/* if not, return -1 */
li r3, -1
blr
/* Woken up due to Hypervisor maintenance interrupt */
4: li r12, BOOK3S_INTERRUPT_HMI
li r3, 1
blr
/* external interrupt - create a stack frame so we can call C */
7: mflr r0
std r0, PPC_LR_STKOFF(r1)
stdu r1, -PPC_MIN_STKFRM(r1)
bl kvmppc_read_intr
nop
li r12, BOOK3S_INTERRUPT_EXTERNAL
cmpdi r3, 1
ble 1f
/*
* Return code of 2 means PCI passthrough interrupt, but
* we need to return back to host to complete handling the
* interrupt. Trap reason is expected in r12 by guest
* exit code.
*/
li r12, BOOK3S_INTERRUPT_HV_RM_HARD
1:
ld r0, PPC_MIN_STKFRM+PPC_LR_STKOFF(r1)
addi r1, r1, PPC_MIN_STKFRM
mtlr r0
blr
/*
* Save away FP, VMX and VSX registers.
* r3 = vcpu pointer
* N.B. r30 and r31 are volatile across this function,
* thus it is not callable from C.
*/
kvmppc_save_fp:
mflr r30
mr r31,r3
mfmsr r5
ori r8,r5,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
addi r3,r3,VCPU_FPRS
bl store_fp_state
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION
addi r3,r31,VCPU_VRS
bl store_vr_state
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif
mfspr r6,SPRN_VRSAVE
stw r6,VCPU_VRSAVE(r31)
mtlr r30
blr
/*
* Load up FP, VMX and VSX registers
* r4 = vcpu pointer
* N.B. r30 and r31 are volatile across this function,
* thus it is not callable from C.
*/
kvmppc_load_fp:
mflr r30
mr r31,r4
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
addi r3,r4,VCPU_FPRS
bl load_fp_state
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION
addi r3,r31,VCPU_VRS
bl load_vr_state
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif
lwz r7,VCPU_VRSAVE(r31)
mtspr SPRN_VRSAVE,r7
mtlr r30
mr r4,r31
blr
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
/*
* Save transactional state and TM-related registers.
* Called with r3 pointing to the vcpu struct and r4 containing
* the guest MSR value.
* r5 is non-zero iff non-volatile register state needs to be maintained.
* If r5 == 0, this can modify all checkpointed registers, but
* restores r1 and r2 before exit.
*/
_GLOBAL_TOC(kvmppc_save_tm_hv)
EXPORT_SYMBOL_GPL(kvmppc_save_tm_hv)
/* See if we need to handle fake suspend mode */
BEGIN_FTR_SECTION
b __kvmppc_save_tm
END_FTR_SECTION_IFCLR(CPU_FTR_P9_TM_HV_ASSIST)
lbz r0, HSTATE_FAKE_SUSPEND(r13) /* Were we fake suspended? */
cmpwi r0, 0
beq __kvmppc_save_tm
/* The following code handles the fake_suspend = 1 case */
mflr r0
std r0, PPC_LR_STKOFF(r1)
stdu r1, -TM_FRAME_SIZE(r1)
/* Turn on TM. */
mfmsr r8
li r0, 1
rldimi r8, r0, MSR_TM_LG, 63-MSR_TM_LG
mtmsrd r8
rldicl. r8, r8, 64 - MSR_TS_S_LG, 62 /* Did we actually hrfid? */
beq 4f
BEGIN_FTR_SECTION
bl pnv_power9_force_smt4_catch
END_FTR_SECTION_IFSET(CPU_FTR_P9_TM_XER_SO_BUG)
nop
/*
* It's possible that treclaim. may modify registers, if we have lost
* track of fake-suspend state in the guest due to it using rfscv.
* Save and restore registers in case this occurs.
*/
mfspr r3, SPRN_DSCR
mfspr r4, SPRN_XER
mfspr r5, SPRN_AMR
/* SPRN_TAR would need to be saved here if the kernel ever used it */
mfcr r12
SAVE_NVGPRS(r1)
SAVE_GPR(2, r1)
SAVE_GPR(3, r1)
SAVE_GPR(4, r1)
SAVE_GPR(5, r1)
stw r12, 8(r1)
std r1, HSTATE_HOST_R1(r13)
/* We have to treclaim here because that's the only way to do S->N */
li r3, TM_CAUSE_KVM_RESCHED
TRECLAIM(R3)
GET_PACA(r13)
ld r1, HSTATE_HOST_R1(r13)
REST_GPR(2, r1)
REST_GPR(3, r1)
REST_GPR(4, r1)
REST_GPR(5, r1)
lwz r12, 8(r1)
REST_NVGPRS(r1)
mtspr SPRN_DSCR, r3
mtspr SPRN_XER, r4
mtspr SPRN_AMR, r5
mtcr r12
HMT_MEDIUM
/*
* We were in fake suspend, so we are not going to save the
* register state as the guest checkpointed state (since
* we already have it), therefore we can now use any volatile GPR.
* In fact treclaim in fake suspend state doesn't modify
* any registers.
*/
BEGIN_FTR_SECTION
bl pnv_power9_force_smt4_release
END_FTR_SECTION_IFSET(CPU_FTR_P9_TM_XER_SO_BUG)
nop
4:
mfspr r3, SPRN_PSSCR
/* PSSCR_FAKE_SUSPEND is a write-only bit, but clear it anyway */
li r0, PSSCR_FAKE_SUSPEND
andc r3, r3, r0
mtspr SPRN_PSSCR, r3
/* Don't save TEXASR, use value from last exit in real suspend state */
ld r9, HSTATE_KVM_VCPU(r13)
mfspr r5, SPRN_TFHAR
mfspr r6, SPRN_TFIAR
std r5, VCPU_TFHAR(r9)
std r6, VCPU_TFIAR(r9)
addi r1, r1, TM_FRAME_SIZE
ld r0, PPC_LR_STKOFF(r1)
mtlr r0
blr
/*
* Restore transactional state and TM-related registers.
* Called with r3 pointing to the vcpu struct
* and r4 containing the guest MSR value.
* r5 is non-zero iff non-volatile register state needs to be maintained.
* This potentially modifies all checkpointed registers.
* It restores r1 and r2 from the PACA.
*/
_GLOBAL_TOC(kvmppc_restore_tm_hv)
EXPORT_SYMBOL_GPL(kvmppc_restore_tm_hv)
/*
* If we are doing TM emulation for the guest on a POWER9 DD2,
* then we don't actually do a trechkpt -- we either set up
* fake-suspend mode, or emulate a TM rollback.
*/
BEGIN_FTR_SECTION
b __kvmppc_restore_tm
END_FTR_SECTION_IFCLR(CPU_FTR_P9_TM_HV_ASSIST)
mflr r0
std r0, PPC_LR_STKOFF(r1)
li r0, 0
stb r0, HSTATE_FAKE_SUSPEND(r13)
/* Turn on TM so we can restore TM SPRs */
mfmsr r5
li r0, 1
rldimi r5, r0, MSR_TM_LG, 63-MSR_TM_LG
mtmsrd r5
/*
* The user may change these outside of a transaction, so they must
* always be context switched.
*/
ld r5, VCPU_TFHAR(r3)
ld r6, VCPU_TFIAR(r3)
ld r7, VCPU_TEXASR(r3)
mtspr SPRN_TFHAR, r5
mtspr SPRN_TFIAR, r6
mtspr SPRN_TEXASR, r7
rldicl. r5, r4, 64 - MSR_TS_S_LG, 62
beqlr /* TM not active in guest */
/* Make sure the failure summary is set */
oris r7, r7, (TEXASR_FS)@h
mtspr SPRN_TEXASR, r7
cmpwi r5, 1 /* check for suspended state */
bgt 10f
stb r5, HSTATE_FAKE_SUSPEND(r13)
b 9f /* and return */
10: stdu r1, -PPC_MIN_STKFRM(r1)
/* guest is in transactional state, so simulate rollback */
bl kvmhv_emulate_tm_rollback
nop
addi r1, r1, PPC_MIN_STKFRM
9: ld r0, PPC_LR_STKOFF(r1)
mtlr r0
blr
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
/*
* We come here if we get any exception or interrupt while we are
* executing host real mode code while in guest MMU context.
* r12 is (CR << 32) | vector
* r13 points to our PACA
* r12 is saved in HSTATE_SCRATCH0(r13)
* r9 is saved in HSTATE_SCRATCH2(r13)
* r13 is saved in HSPRG1
* cfar is saved in HSTATE_CFAR(r13)
* ppr is saved in HSTATE_PPR(r13)
*/
kvmppc_bad_host_intr:
/*
* Switch to the emergency stack, but start half-way down in
* case we were already on it.
*/
mr r9, r1
std r1, PACAR1(r13)
ld r1, PACAEMERGSP(r13)
subi r1, r1, THREAD_SIZE/2 + INT_FRAME_SIZE
std r9, 0(r1)
std r0, GPR0(r1)
std r9, GPR1(r1)
std r2, GPR2(r1)
SAVE_GPRS(3, 8, r1)
srdi r0, r12, 32
clrldi r12, r12, 32
std r0, _CCR(r1)
std r12, _TRAP(r1)
andi. r0, r12, 2
beq 1f
mfspr r3, SPRN_HSRR0
mfspr r4, SPRN_HSRR1
mfspr r5, SPRN_HDAR
mfspr r6, SPRN_HDSISR
b 2f
1: mfspr r3, SPRN_SRR0
mfspr r4, SPRN_SRR1
mfspr r5, SPRN_DAR
mfspr r6, SPRN_DSISR
2: std r3, _NIP(r1)
std r4, _MSR(r1)
std r5, _DAR(r1)
std r6, _DSISR(r1)
ld r9, HSTATE_SCRATCH2(r13)
ld r12, HSTATE_SCRATCH0(r13)
GET_SCRATCH0(r0)
SAVE_GPRS(9, 12, r1)
std r0, GPR13(r1)
SAVE_NVGPRS(r1)
ld r5, HSTATE_CFAR(r13)
std r5, ORIG_GPR3(r1)
mflr r3
mfctr r4
mfxer r5
lbz r6, PACAIRQSOFTMASK(r13)
std r3, _LINK(r1)
std r4, _CTR(r1)
std r5, _XER(r1)
std r6, SOFTE(r1)
LOAD_PACA_TOC()
LOAD_REG_IMMEDIATE(3, STACK_FRAME_REGS_MARKER)
std r3, STACK_FRAME_OVERHEAD-16(r1)
/*
* XXX On POWER7 and POWER8, we just spin here since we don't
* know what the other threads are doing (and we don't want to
* coordinate with them) - but at least we now have register state
* in memory that we might be able to look at from another CPU.
*/
b .
/*
* This mimics the MSR transition on IRQ delivery. The new guest MSR is taken
* from VCPU_INTR_MSR and is modified based on the required TM state changes.
* r11 has the guest MSR value (in/out)
* r9 has a vcpu pointer (in)
* r0 is used as a scratch register
*/
kvmppc_msr_interrupt:
rldicl r0, r11, 64 - MSR_TS_S_LG, 62
cmpwi r0, 2 /* Check if we are in transactional state.. */
ld r11, VCPU_INTR_MSR(r9)
bne 1f
/* ... if transactional, change to suspended */
li r0, 1
1: rldimi r11, r0, MSR_TS_S_LG, 63 - MSR_TS_T_LG
blr
/*
* void kvmhv_load_guest_pmu(struct kvm_vcpu *vcpu)
*
* Load up guest PMU state. R3 points to the vcpu struct.
*/
kvmhv_load_guest_pmu:
mr r4, r3
mflr r0
li r3, 1
sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */
mtspr SPRN_MMCR0, r3 /* freeze all counters, disable ints */
isync
BEGIN_FTR_SECTION
ld r3, VCPU_MMCR(r4)
andi. r5, r3, MMCR0_PMAO_SYNC | MMCR0_PMAO
cmpwi r5, MMCR0_PMAO
beql kvmppc_fix_pmao
END_FTR_SECTION_IFSET(CPU_FTR_PMAO_BUG)
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)
mtspr SPRN_PMC1, r3
mtspr SPRN_PMC2, r5
mtspr SPRN_PMC3, r6
mtspr SPRN_PMC4, r7
mtspr SPRN_PMC5, r8
mtspr SPRN_PMC6, r9
ld r3, VCPU_MMCR(r4)
ld r5, VCPU_MMCR + 8(r4)
ld r6, VCPU_MMCRA(r4)
ld r7, VCPU_SIAR(r4)
ld r8, VCPU_SDAR(r4)
mtspr SPRN_MMCR1, r5
mtspr SPRN_MMCRA, r6
mtspr SPRN_SIAR, r7
mtspr SPRN_SDAR, r8
BEGIN_FTR_SECTION
ld r5, VCPU_MMCR + 16(r4)
ld r6, VCPU_SIER(r4)
mtspr SPRN_MMCR2, r5
mtspr SPRN_SIER, r6
lwz r7, VCPU_PMC + 24(r4)
lwz r8, VCPU_PMC + 28(r4)
ld r9, VCPU_MMCRS(r4)
mtspr SPRN_SPMC1, r7
mtspr SPRN_SPMC2, r8
mtspr SPRN_MMCRS, r9
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
mtspr SPRN_MMCR0, r3
isync
mtlr r0
blr
/*
* void kvmhv_load_host_pmu(void)
*
* Reload host PMU state saved in the PACA by kvmhv_save_host_pmu.
*/
kvmhv_load_host_pmu:
mflr r0
lbz r4, PACA_PMCINUSE(r13) /* is the host using the PMU? */
cmpwi r4, 0
beq 23f /* skip if not */
BEGIN_FTR_SECTION
ld r3, HSTATE_MMCR0(r13)
andi. r4, r3, MMCR0_PMAO_SYNC | MMCR0_PMAO
cmpwi r4, MMCR0_PMAO
beql kvmppc_fix_pmao
END_FTR_SECTION_IFSET(CPU_FTR_PMAO_BUG)
lwz r3, HSTATE_PMC1(r13)
lwz r4, HSTATE_PMC2(r13)
lwz r5, HSTATE_PMC3(r13)
lwz r6, HSTATE_PMC4(r13)
lwz r8, HSTATE_PMC5(r13)
lwz r9, HSTATE_PMC6(r13)
mtspr SPRN_PMC1, r3
mtspr SPRN_PMC2, r4
mtspr SPRN_PMC3, r5
mtspr SPRN_PMC4, r6
mtspr SPRN_PMC5, r8
mtspr SPRN_PMC6, r9
ld r3, HSTATE_MMCR0(r13)
ld r4, HSTATE_MMCR1(r13)
ld r5, HSTATE_MMCRA(r13)
ld r6, HSTATE_SIAR(r13)
ld r7, HSTATE_SDAR(r13)
mtspr SPRN_MMCR1, r4
mtspr SPRN_MMCRA, r5
mtspr SPRN_SIAR, r6
mtspr SPRN_SDAR, r7
BEGIN_FTR_SECTION
ld r8, HSTATE_MMCR2(r13)
ld r9, HSTATE_SIER(r13)
mtspr SPRN_MMCR2, r8
mtspr SPRN_SIER, r9
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
mtspr SPRN_MMCR0, r3
isync
mtlr r0
23: blr
/*
* void kvmhv_save_guest_pmu(struct kvm_vcpu *vcpu, bool pmu_in_use)
*
* Save guest PMU state into the vcpu struct.
* r3 = vcpu, r4 = full save flag (PMU in use flag set in VPA)
*/
kvmhv_save_guest_pmu:
mr r9, r3
mr r8, r4
BEGIN_FTR_SECTION
/*
* POWER8 seems to have a hardware bug where setting
* MMCR0[PMAE] along with MMCR0[PMC1CE] and/or MMCR0[PMCjCE]
* when some counters are already negative doesn't seem
* to cause a performance monitor alert (and hence interrupt).
* The effect of this is that when saving the PMU state,
* if there is no PMU alert pending when we read MMCR0
* before freezing the counters, but one becomes pending
* before we read the counters, we lose it.
* To work around this, we need a way to freeze the counters
* before reading MMCR0. Normally, freezing the counters
* is done by writing MMCR0 (to set MMCR0[FC]) which
* unavoidably writes MMCR0[PMA0] as well. On POWER8,
* we can also freeze the counters using MMCR2, by writing
* 1s to all the counter freeze condition bits (there are
* 9 bits each for 6 counters).
*/
li r3, -1 /* set all freeze bits */
clrrdi r3, r3, 10
mfspr r10, SPRN_MMCR2
mtspr SPRN_MMCR2, r3
isync
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
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 */
mfspr r6, SPRN_MMCRA
/* Clear MMCRA in order to disable SDAR updates */
li r7, 0
mtspr SPRN_MMCRA, r7
isync
cmpwi r8, 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 r7, SPRN_SIAR
mfspr r8, SPRN_SDAR
std r4, VCPU_MMCR(r9)
std r5, VCPU_MMCR + 8(r9)
std r6, VCPU_MMCRA(r9)
BEGIN_FTR_SECTION
std r10, VCPU_MMCR + 16(r9)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
std r7, VCPU_SIAR(r9)
std r8, VCPU_SDAR(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
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
mfspr r5, SPRN_SIER
std r5, VCPU_SIER(r9)
mfspr r6, SPRN_SPMC1
mfspr r7, SPRN_SPMC2
mfspr r8, SPRN_MMCRS
stw r6, VCPU_PMC + 24(r9)
stw r7, VCPU_PMC + 28(r9)
std r8, VCPU_MMCRS(r9)
lis r4, 0x8000
mtspr SPRN_MMCRS, r4
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
22: blr
/*
* This works around a hardware bug on POWER8E processors, where
* writing a 1 to the MMCR0[PMAO] bit doesn't generate a
* performance monitor interrupt. Instead, when we need to have
* an interrupt pending, we have to arrange for a counter to overflow.
*/
kvmppc_fix_pmao:
li r3, 0
mtspr SPRN_MMCR2, r3
lis r3, (MMCR0_PMXE | MMCR0_FCECE)@h
ori r3, r3, MMCR0_PMCjCE | MMCR0_C56RUN
mtspr SPRN_MMCR0, r3
lis r3, 0x7fff
ori r3, r3, 0xffff
mtspr SPRN_PMC6, r3
isync
blr
#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
/*
* Start timing an activity
* r3 = pointer to time accumulation struct, r4 = vcpu
*/
kvmhv_start_timing:
ld r5, HSTATE_KVM_VCORE(r13)
ld r6, VCORE_TB_OFFSET_APPL(r5)
mftb r5
subf r5, r6, r5 /* subtract current timebase offset */
std r3, VCPU_CUR_ACTIVITY(r4)
std r5, VCPU_ACTIVITY_START(r4)
blr
/*
* Accumulate time to one activity and start another.
* r3 = pointer to new time accumulation struct, r4 = vcpu
*/
kvmhv_accumulate_time:
ld r5, HSTATE_KVM_VCORE(r13)
ld r8, VCORE_TB_OFFSET_APPL(r5)
ld r5, VCPU_CUR_ACTIVITY(r4)
ld r6, VCPU_ACTIVITY_START(r4)
std r3, VCPU_CUR_ACTIVITY(r4)
mftb r7
subf r7, r8, r7 /* subtract current timebase offset */
std r7, VCPU_ACTIVITY_START(r4)
cmpdi r5, 0
beqlr
subf r3, r6, r7
ld r8, TAS_SEQCOUNT(r5)
cmpdi r8, 0
addi r8, r8, 1
std r8, TAS_SEQCOUNT(r5)
lwsync
ld r7, TAS_TOTAL(r5)
add r7, r7, r3
std r7, TAS_TOTAL(r5)
ld r6, TAS_MIN(r5)
ld r7, TAS_MAX(r5)
beq 3f
cmpd r3, r6
bge 1f
3: std r3, TAS_MIN(r5)
1: cmpd r3, r7
ble 2f
std r3, TAS_MAX(r5)
2: lwsync
addi r8, r8, 1
std r8, TAS_SEQCOUNT(r5)
blr
#endif