From: Nicholas Piggin <npiggin@gmail.com>
To: kvm-ppc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org, Nicholas Piggin <npiggin@gmail.com>
Subject: [PATCH v2 46/60] KVM: PPC: Book3S HV P9: Use Linux SPR save/restore to manage some host SPRs
Date: Thu, 12 Aug 2021 02:01:20 +1000 [thread overview]
Message-ID: <20210811160134.904987-47-npiggin@gmail.com> (raw)
In-Reply-To: <20210811160134.904987-1-npiggin@gmail.com>
Linux implements SPR save/restore including storage space for registers
in the task struct for process context switching. Make use of this
similarly to the way we make use of the context switching fp/vec save
restore.
This improves code reuse, allows some stack space to be saved, and helps
with avoiding VRSAVE updates if they are not required.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/include/asm/switch_to.h | 2 +
arch/powerpc/kernel/process.c | 6 ++
arch/powerpc/kvm/book3s_hv.c | 21 +-----
arch/powerpc/kvm/book3s_hv.h | 3 -
arch/powerpc/kvm/book3s_hv_p9_entry.c | 93 +++++++++++++++++++--------
5 files changed, 74 insertions(+), 51 deletions(-)
diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h
index 9d1fbd8be1c7..de17c45314bc 100644
--- a/arch/powerpc/include/asm/switch_to.h
+++ b/arch/powerpc/include/asm/switch_to.h
@@ -112,6 +112,8 @@ static inline void clear_task_ebb(struct task_struct *t)
#endif
}
+void kvmppc_save_current_sprs(void);
+
extern int set_thread_tidr(struct task_struct *t);
#endif /* _ASM_POWERPC_SWITCH_TO_H */
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 4d4e99b1756e..2225d5172e3c 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1182,6 +1182,12 @@ static inline void save_sprs(struct thread_struct *t)
#endif
}
+void kvmppc_save_current_sprs(void)
+{
+ save_sprs(¤t->thread);
+}
+EXPORT_SYMBOL_GPL(kvmppc_save_current_sprs);
+
static inline void restore_sprs(struct thread_struct *old_thread,
struct thread_struct *new_thread)
{
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 2254101a7760..719d8bec4436 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -4533,9 +4533,6 @@ static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu)
struct kvm_run *run = vcpu->run;
int r;
int srcu_idx;
- unsigned long ebb_regs[3] = {}; /* shut up GCC */
- unsigned long user_tar = 0;
- unsigned int user_vrsave;
struct kvm *kvm;
unsigned long msr;
@@ -4596,14 +4593,7 @@ static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu)
save_user_regs_kvm();
- /* Save userspace EBB and other register values */
- if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
- ebb_regs[0] = mfspr(SPRN_EBBHR);
- ebb_regs[1] = mfspr(SPRN_EBBRR);
- ebb_regs[2] = mfspr(SPRN_BESCR);
- user_tar = mfspr(SPRN_TAR);
- }
- user_vrsave = mfspr(SPRN_VRSAVE);
+ kvmppc_save_current_sprs();
vcpu->arch.waitp = &vcpu->arch.vcore->wait;
vcpu->arch.pgdir = kvm->mm->pgd;
@@ -4644,15 +4634,6 @@ static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu)
}
} while (is_kvmppc_resume_guest(r));
- /* Restore userspace EBB and other register values */
- if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
- mtspr(SPRN_EBBHR, ebb_regs[0]);
- mtspr(SPRN_EBBRR, ebb_regs[1]);
- mtspr(SPRN_BESCR, ebb_regs[2]);
- mtspr(SPRN_TAR, user_tar);
- }
- mtspr(SPRN_VRSAVE, user_vrsave);
-
vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
atomic_dec(&kvm->arch.vcpus_running);
diff --git a/arch/powerpc/kvm/book3s_hv.h b/arch/powerpc/kvm/book3s_hv.h
index d3ea4c89f4fa..028dec70bdac 100644
--- a/arch/powerpc/kvm/book3s_hv.h
+++ b/arch/powerpc/kvm/book3s_hv.h
@@ -3,11 +3,8 @@
* Privileged (non-hypervisor) host registers to save.
*/
struct p9_host_os_sprs {
- unsigned long dscr;
- unsigned long tidr;
unsigned long iamr;
unsigned long amr;
- unsigned long fscr;
unsigned int pmc1;
unsigned int pmc2;
diff --git a/arch/powerpc/kvm/book3s_hv_p9_entry.c b/arch/powerpc/kvm/book3s_hv_p9_entry.c
index ae5832a0836f..7770d08a2875 100644
--- a/arch/powerpc/kvm/book3s_hv_p9_entry.c
+++ b/arch/powerpc/kvm/book3s_hv_p9_entry.c
@@ -231,15 +231,26 @@ EXPORT_SYMBOL_GPL(switch_pmu_to_host);
static void load_spr_state(struct kvm_vcpu *vcpu,
struct p9_host_os_sprs *host_os_sprs)
{
+ /* TAR is very fast */
mtspr(SPRN_TAR, vcpu->arch.tar);
+#ifdef CONFIG_ALTIVEC
+ if (cpu_has_feature(CPU_FTR_ALTIVEC) &&
+ current->thread.vrsave != vcpu->arch.vrsave)
+ mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
+#endif
+
if (vcpu->arch.hfscr & HFSCR_EBB) {
- mtspr(SPRN_EBBHR, vcpu->arch.ebbhr);
- mtspr(SPRN_EBBRR, vcpu->arch.ebbrr);
- mtspr(SPRN_BESCR, vcpu->arch.bescr);
+ if (current->thread.ebbhr != vcpu->arch.ebbhr)
+ mtspr(SPRN_EBBHR, vcpu->arch.ebbhr);
+ if (current->thread.ebbrr != vcpu->arch.ebbrr)
+ mtspr(SPRN_EBBRR, vcpu->arch.ebbrr);
+ if (current->thread.bescr != vcpu->arch.bescr)
+ mtspr(SPRN_BESCR, vcpu->arch.bescr);
}
- if (!cpu_has_feature(CPU_FTR_ARCH_31))
+ if (!cpu_has_feature(CPU_FTR_ARCH_31) &&
+ current->thread.tidr != vcpu->arch.tid)
mtspr(SPRN_TIDR, vcpu->arch.tid);
if (host_os_sprs->iamr != vcpu->arch.iamr)
mtspr(SPRN_IAMR, vcpu->arch.iamr);
@@ -247,9 +258,9 @@ static void load_spr_state(struct kvm_vcpu *vcpu,
mtspr(SPRN_AMR, vcpu->arch.amr);
if (vcpu->arch.uamor != 0)
mtspr(SPRN_UAMOR, vcpu->arch.uamor);
- if (host_os_sprs->fscr != vcpu->arch.fscr)
+ if (current->thread.fscr != vcpu->arch.fscr)
mtspr(SPRN_FSCR, vcpu->arch.fscr);
- if (host_os_sprs->dscr != vcpu->arch.dscr)
+ if (current->thread.dscr != vcpu->arch.dscr)
mtspr(SPRN_DSCR, vcpu->arch.dscr);
if (vcpu->arch.pspb != 0)
mtspr(SPRN_PSPB, vcpu->arch.pspb);
@@ -269,20 +280,15 @@ static void store_spr_state(struct kvm_vcpu *vcpu)
{
vcpu->arch.tar = mfspr(SPRN_TAR);
+#ifdef CONFIG_ALTIVEC
+ if (cpu_has_feature(CPU_FTR_ALTIVEC))
+ vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
+#endif
+
if (vcpu->arch.hfscr & HFSCR_EBB) {
vcpu->arch.ebbhr = mfspr(SPRN_EBBHR);
vcpu->arch.ebbrr = mfspr(SPRN_EBBRR);
vcpu->arch.bescr = mfspr(SPRN_BESCR);
- /*
- * This is like load_fp in context switching, turn off the
- * facility after it wraps the u8 to try avoiding saving
- * and restoring the registers each partition switch.
- */
- if (!vcpu->arch.nested) {
- vcpu->arch.load_ebb++;
- if (!vcpu->arch.load_ebb)
- vcpu->arch.hfscr &= ~HFSCR_EBB;
- }
}
if (!cpu_has_feature(CPU_FTR_ARCH_31))
@@ -322,7 +328,6 @@ bool load_vcpu_state(struct kvm_vcpu *vcpu,
#ifdef CONFIG_ALTIVEC
load_vr_state(&vcpu->arch.vr);
#endif
- mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
return ret;
}
@@ -336,7 +341,6 @@ void store_vcpu_state(struct kvm_vcpu *vcpu)
#ifdef CONFIG_ALTIVEC
store_vr_state(&vcpu->arch.vr);
#endif
- vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
if (cpu_has_feature(CPU_FTR_TM) ||
cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) {
@@ -360,12 +364,8 @@ EXPORT_SYMBOL_GPL(store_vcpu_state);
void save_p9_host_os_sprs(struct p9_host_os_sprs *host_os_sprs)
{
- if (!cpu_has_feature(CPU_FTR_ARCH_31))
- host_os_sprs->tidr = mfspr(SPRN_TIDR);
host_os_sprs->iamr = mfspr(SPRN_IAMR);
host_os_sprs->amr = mfspr(SPRN_AMR);
- host_os_sprs->fscr = mfspr(SPRN_FSCR);
- host_os_sprs->dscr = mfspr(SPRN_DSCR);
}
EXPORT_SYMBOL_GPL(save_p9_host_os_sprs);
@@ -373,26 +373,63 @@ EXPORT_SYMBOL_GPL(save_p9_host_os_sprs);
void restore_p9_host_os_sprs(struct kvm_vcpu *vcpu,
struct p9_host_os_sprs *host_os_sprs)
{
+ /*
+ * current->thread.xxx registers must all be restored to host
+ * values before a potential context switch, othrewise the context
+ * switch itself will overwrite current->thread.xxx with the values
+ * from the guest SPRs.
+ */
+
mtspr(SPRN_SPRG_VDSO_WRITE, local_paca->sprg_vdso);
- if (!cpu_has_feature(CPU_FTR_ARCH_31))
- mtspr(SPRN_TIDR, host_os_sprs->tidr);
+ if (!cpu_has_feature(CPU_FTR_ARCH_31) &&
+ current->thread.tidr != vcpu->arch.tid)
+ mtspr(SPRN_TIDR, current->thread.tidr);
if (host_os_sprs->iamr != vcpu->arch.iamr)
mtspr(SPRN_IAMR, host_os_sprs->iamr);
if (vcpu->arch.uamor != 0)
mtspr(SPRN_UAMOR, 0);
if (host_os_sprs->amr != vcpu->arch.amr)
mtspr(SPRN_AMR, host_os_sprs->amr);
- if (host_os_sprs->fscr != vcpu->arch.fscr)
- mtspr(SPRN_FSCR, host_os_sprs->fscr);
- if (host_os_sprs->dscr != vcpu->arch.dscr)
- mtspr(SPRN_DSCR, host_os_sprs->dscr);
+ if (current->thread.fscr != vcpu->arch.fscr)
+ mtspr(SPRN_FSCR, current->thread.fscr);
+ if (current->thread.dscr != vcpu->arch.dscr)
+ mtspr(SPRN_DSCR, current->thread.dscr);
if (vcpu->arch.pspb != 0)
mtspr(SPRN_PSPB, 0);
/* Save guest CTRL register, set runlatch to 1 */
if (!(vcpu->arch.ctrl & 1))
mtspr(SPRN_CTRLT, 1);
+
+#ifdef CONFIG_ALTIVEC
+ if (cpu_has_feature(CPU_FTR_ALTIVEC) &&
+ vcpu->arch.vrsave != current->thread.vrsave)
+ mtspr(SPRN_VRSAVE, current->thread.vrsave);
+#endif
+ if (vcpu->arch.hfscr & HFSCR_EBB) {
+ if (vcpu->arch.bescr != current->thread.bescr)
+ mtspr(SPRN_BESCR, current->thread.bescr);
+ if (vcpu->arch.ebbhr != current->thread.ebbhr)
+ mtspr(SPRN_EBBHR, current->thread.ebbhr);
+ if (vcpu->arch.ebbrr != current->thread.ebbrr)
+ mtspr(SPRN_EBBRR, current->thread.ebbrr);
+
+ if (!vcpu->arch.nested) {
+ /*
+ * This is like load_fp in context switching, turn off
+ * the facility after it wraps the u8 to try avoiding
+ * saving and restoring the registers each partition
+ * switch.
+ */
+ vcpu->arch.load_ebb++;
+ if (!vcpu->arch.load_ebb)
+ vcpu->arch.hfscr &= ~HFSCR_EBB;
+ }
+ }
+
+ if (vcpu->arch.tar != current->thread.tar)
+ mtspr(SPRN_TAR, current->thread.tar);
}
EXPORT_SYMBOL_GPL(restore_p9_host_os_sprs);
--
2.23.0
next prev parent reply other threads:[~2021-08-11 16:32 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-11 16:00 [PATCH v2 00/60] KVM: PPC: Book3S HV P9: entry/exit optimisations Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 01/60] KVM: PPC: Book3S HV: Initialise vcpu MSR with MSR_ME Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 02/60] KVM: PPC: Book3S HV: Remove TM emulation from POWER7/8 path Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 03/60] KVM: PPC: Book3S HV P9: Fixes for TM softpatch interrupt NIP Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 04/60] KVM: PPC: Book3S HV Nested: Fix TM softpatch HFAC interrupt emulation Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 05/60] KVM: PPC: Book3S HV Nested: Sanitise vcpu registers Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 06/60] KVM: PPC: Book3S HV Nested: Make nested HFSCR state accessible Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 07/60] KVM: PPC: Book3S HV Nested: Stop forwarding all HFUs to L1 Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 08/60] KVM: PPC: Book3S HV Nested: save_hv_return_state does not require trap argument Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 09/60] KVM: PPC: Book3S HV Nested: Reflect guest PMU in-use to L0 when guest SPRs are live Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 10/60] powerpc/64s: Remove WORT SPR from POWER9/10 Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 11/60] KMV: PPC: Book3S HV P9: Use set_dec to set decrementer to host Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 12/60] KVM: PPC: Book3S HV P9: Use host timer accounting to avoid decrementer read Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 13/60] KVM: PPC: Book3S HV P9: Use large decrementer for HDEC Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 14/60] KVM: PPC: Book3S HV P9: Reduce mftb per guest entry/exit Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 15/60] powerpc/time: add API for KVM to re-arm the host timer/decrementer Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 16/60] KVM: PPC: Book3S HV: POWER10 enable HAIL when running radix guests Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 17/60] powerpc/64s: Keep AMOR SPR a constant ~0 at runtime Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 18/60] KVM: PPC: Book3S HV: Don't always save PMU for guest capable of nesting Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 19/60] powerpc/64s: Always set PMU control registers to frozen/disabled when not in use Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 20/60] powerpc/64s: Implement PMU override command line option Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 21/60] KVM: PPC: Book3S HV P9: Implement PMU save/restore in C Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 22/60] KVM: PPC: Book3S HV P9: Factor PMU save/load into context switch functions Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 23/60] KVM: PPC: Book3S HV P9: Demand fault PMU SPRs when marked not inuse Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 24/60] KVM: PPC: Book3S HV P9: Factor out yield_count increment Nicholas Piggin
2021-08-11 16:00 ` [PATCH v2 25/60] KVM: PPC: Book3S HV: CTRL SPR does not require read-modify-write Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 26/60] KVM: PPC: Book3S HV P9: Move SPRG restore to restore_p9_host_os_sprs Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 27/60] KVM: PPC: Book3S HV P9: Reduce mtmsrd instructions required to save host SPRs Nicholas Piggin
2021-08-11 19:18 ` kernel test robot
2021-08-11 19:49 ` kernel test robot
2021-08-11 16:01 ` [PATCH v2 28/60] KVM: PPC: Book3S HV P9: Improve mtmsrd scheduling by delaying MSR[EE] disable Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 29/60] KVM: PPC: Book3S HV P9: Add kvmppc_stop_thread to match kvmppc_start_thread Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 30/60] KVM: PPC: Book3S HV: Change dec_expires to be relative to guest timebase Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 31/60] KVM: PPC: Book3S HV P9: Move TB updates Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 32/60] KVM: PPC: Book3S HV P9: Optimise timebase reads Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 33/60] KVM: PPC: Book3S HV P9: Avoid SPR scoreboard stalls Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 34/60] KVM: PPC: Book3S HV P9: Only execute mtSPR if the value changed Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 35/60] KVM: PPC: Book3S HV P9: Juggle SPR switching around Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 36/60] KVM: PPC: Book3S HV P9: Move vcpu register save/restore into functions Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 37/60] KVM: PPC: Book3S HV P9: Move host OS save/restore functions to built-in Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 38/60] KVM: PPC: Book3S HV P9: Move nested guest entry into its own function Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 39/60] KVM: PPC: Book3S HV P9: Move remaining SPR and MSR access into low level entry Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 40/60] KVM: PPC: Book3S HV P9: Implement TM fastpath for guest entry/exit Nicholas Piggin
2021-08-11 20:40 ` kernel test robot
2021-08-11 16:01 ` [PATCH v2 41/60] KVM: PPC: Book3S HV P9: Switch PMU to guest as late as possible Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 42/60] KVM: PPC: Book3S HV P9: Restrict DSISR canary workaround to processors that require it Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 43/60] KVM: PPC: Book3S HV P9: More SPR speed improvements Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 44/60] KVM: PPC: Book3S HV P9: Demand fault EBB facility registers Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 45/60] KVM: PPC: Book3S HV P9: Demand fault TM " Nicholas Piggin
2021-08-11 16:01 ` Nicholas Piggin [this message]
2021-08-11 16:01 ` [PATCH v2 47/60] KVM: PPC: Book3S HV P9: Comment and fix MMU context switching code Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 48/60] KVM: PPC: Book3S HV P9: Test dawr_enabled() before saving host DAWR SPRs Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 49/60] KVM: PPC: Book3S HV P9: Don't restore PSSCR if not needed Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 50/60] KVM: PPC: Book3S HV P9: Avoid tlbsync sequence on radix guest exit Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 51/60] KVM: PPC: Book3S HV Nested: Avoid extra mftb() in nested entry Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 52/60] KVM: PPC: Book3S HV P9: Improve mfmsr performance on entry Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 53/60] KVM: PPC: Book3S HV P9: Optimise hash guest SLB saving Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 54/60] KVM: PPC: Book3S HV P9: Avoid changing MSR[RI] in entry and exit Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 55/60] KVM: PPC: Book3S HV P9: Add unlikely annotation for !mmu_ready Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 56/60] KVM: PPC: Book3S HV P9: Avoid cpu_in_guest atomics on entry and exit Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 57/60] KVM: PPC: Book3S HV P9: Remove most of the vcore logic Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 58/60] KVM: PPC: Book3S HV P9: Tidy kvmppc_create_dtl_entry Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 59/60] KVM: PPC: Book3S HV P9: Stop using vc->dpdes Nicholas Piggin
2021-08-11 16:01 ` [PATCH v2 60/60] KVM: PPC: Book3S HV P9: Remove subcore HMI handling Nicholas Piggin
2021-08-16 8:41 ` [PATCH v2 00/60] KVM: PPC: Book3S HV P9: entry/exit optimisations Athira Rajeev
2021-08-27 13:16 ` (subset) " Michael Ellerman
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