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Merge branch 'topic/ppc-kvm' into next

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Merge our topic branch shared with KVM. In particular this includes the
rewrite of the idle code into C.
This commit is contained in:
Michael Ellerman
2019-04-30 22:52:03 +10:00
parent 7ae3f6e130 e9cef0189c
commit bdc7c970bc
23 changed files with 1267 additions and 1285 deletions
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3
arch/powerpc/kvm/book3s_hv.c
View File

@@ -74,6 +74,7 @@
#include <asm/opal.h>
#include <asm/xics.h>
#include <asm/xive.h>
#include <asm/hw_breakpoint.h>
#include "book3s.h"
@@ -3374,7 +3375,7 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
mtspr(SPRN_PURR, vcpu->arch.purr);
mtspr(SPRN_SPURR, vcpu->arch.spurr);
if (cpu_has_feature(CPU_FTR_DAWR)) {
if (dawr_enabled()) {
mtspr(SPRN_DAWR, vcpu->arch.dawr);
mtspr(SPRN_DAWRX, vcpu->arch.dawrx);
}

141
arch/powerpc/kvm/book3s_hv_rmhandlers.S
View File

@@ -35,6 +35,7 @@
#include <asm/thread_info.h>
#include <asm/asm-compat.h>
#include <asm/feature-fixups.h>
#include <asm/cpuidle.h>
/* Sign-extend HDEC if not on POWER9 */
#define EXTEND_HDEC(reg) \
@@ -45,6 +46,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
/* 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 208
@@ -290,17 +292,19 @@ kvm_novcpu_exit:
b kvmhv_switch_to_host
/*
* We come in here when wakened from nap mode.
* Relocation is off and most register values are lost.
* r13 points to the PACA.
* We come in here when wakened from Linux offline idle code.
* Relocation is off
* r3 contains the SRR1 wakeup value, SRR1 is trashed.
*/
.globl kvm_start_guest
kvm_start_guest:
/* Set runlatch bit the minute you wake up from nap */
mfspr r0, SPRN_CTRLF
ori r0, r0, 1
mtspr SPRN_CTRLT, r0
_GLOBAL(idle_kvm_start_guest)
ld r4,PACAEMERGSP(r13)
mfcr r5
mflr r0
std r1,0(r4)
std r5,8(r4)
std r0,16(r4)
subi r1,r4,STACK_FRAME_OVERHEAD
SAVE_NVGPRS(r1)
/*
* Could avoid this and pass it through in r3. For now,
@@ -308,27 +312,23 @@ kvm_start_guest:
*/
mtspr SPRN_SRR1,r3
ld r2,PACATOC(r13)
li r0,0
stb r0,PACA_FTRACE_ENABLED(r13)
li r0,KVM_HWTHREAD_IN_KVM
stb r0,HSTATE_HWTHREAD_STATE(r13)
/* NV GPR values from power7_idle() will no longer be valid */
li r0,1
stb r0,PACA_NAPSTATELOST(r13)
/* were we napping due to cede? */
/* kvm cede / napping does not come through here */
lbz r0,HSTATE_NAPPING(r13)
cmpwi r0,NAPPING_CEDE
beq kvm_end_cede
cmpwi r0,NAPPING_NOVCPU
beq kvm_novcpu_wakeup
twnei r0,0
ld r1,PACAEMERGSP(r13)
subi r1,r1,STACK_FRAME_OVERHEAD
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
@@ -437,19 +437,25 @@ kvm_no_guest:
lbz r3, HSTATE_HWTHREAD_REQ(r13)
cmpwi r3, 0
bne 54f
/*
* We jump to pnv_wakeup_loss, which will return to the caller
* of power7_nap in the powernv cpu offline loop. The value we
* put in r3 becomes the return value for power7_nap. pnv_wakeup_loss
* requires SRR1 in r12.
*/
/*
* 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
li r3, 0
mfspr r12,SPRN_SRR1
b pnv_wakeup_loss
/* set up r3 for return */
mfspr r3,SPRN_SRR1
REST_NVGPRS(r1)
addi r1, r1, STACK_FRAME_OVERHEAD
ld r0, 16(r1)
ld r5, 8(r1)
ld r1, 0(r1)
mtlr r0
mtcr r5
blr
53: HMT_LOW
ld r5, HSTATE_KVM_VCORE(r13)
@@ -534,6 +540,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
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)
@@ -822,18 +830,21 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
mtspr SPRN_IAMR, r5
mtspr SPRN_PSPB, r6
mtspr SPRN_FSCR, r7
ld r5, VCPU_DAWR(r4)
ld r6, VCPU_DAWRX(r4)
ld r7, VCPU_CIABR(r4)
ld r8, VCPU_TAR(r4)
/*
* Handle broken DAWR case by not writing it. This means we
* can still store the DAWR register for migration.
*/
BEGIN_FTR_SECTION
LOAD_REG_ADDR(r5, dawr_force_enable)
lbz r5, 0(r5)
cmpdi r5, 0
beq 1f
ld r5, VCPU_DAWR(r4)
ld r6, VCPU_DAWRX(r4)
mtspr SPRN_DAWR, r5
mtspr SPRN_DAWRX, r6
END_FTR_SECTION_IFSET(CPU_FTR_DAWR)
1:
ld r7, VCPU_CIABR(r4)
ld r8, VCPU_TAR(r4)
mtspr SPRN_CIABR, r7
mtspr SPRN_TAR, r8
ld r5, VCPU_IC(r4)
@@ -2513,11 +2524,11 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
blr
2:
BEGIN_FTR_SECTION
/* POWER9 with disabled DAWR */
LOAD_REG_ADDR(r11, dawr_force_enable)
lbz r11, 0(r11)
cmpdi r11, 0
li r3, H_HARDWARE
blr
END_FTR_SECTION_IFCLR(CPU_FTR_DAWR)
beqlr
/* 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
@@ -2654,6 +2665,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
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.
@@ -2682,26 +2696,42 @@ BEGIN_FTR_SECTION
* requested level = 0 (just stop dispatching)
*/
lis r3, (PSSCR_EC | PSSCR_ESL)@h
mtspr SPRN_PSSCR, r3
/* Set LPCR_PECE_HVEE bit to enable wakeup by HV interrupts */
li r4, LPCR_PECE_HVEE@higher
sldi r4, r4, 32
or r5, r5, r4
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
FTR_SECTION_ELSE
li r3, PNV_THREAD_NAP
ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
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
BEGIN_FTR_SECTION
nap
bl isa300_idle_stop_mayloss
FTR_SECTION_ELSE
PPC_STOP
ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_300)
b .
bl isa206_idle_insn_mayloss
ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
mfspr r0, SPRN_CTRLF
ori r0, 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
@@ -2709,12 +2739,11 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_300)
b 34f
kvm_end_cede:
/* Woken by external or decrementer interrupt */
/* get vcpu pointer */
ld r4, HSTATE_KVM_VCPU(r13)
/* Woken by external or decrementer interrupt */
ld r1, HSTATE_HOST_R1(r13)
#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
addi r3, r4, VCPU_TB_RMINTR
bl kvmhv_accumulate_time