[PATCH v1 36/55] KVM: PPC: Book3S HV P9: Implement TM fastpath for guest entry/exit
Nicholas Piggin <[email protected]>
| Newsgroups | org.kernel.vger.kvm-ppc,org.ozlabs.lists.linuxppc-dev |
|---|---|
| Message-ID | <[email protected]> |
If TM is not active, only TM register state needs to be saved. -348 cycles (7218) POWER9 virt-mode NULL hcall Signed-off-by: Nicholas Piggin <[email protected]> --- arch/powerpc/kvm/book3s_hv_p9_entry.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv_p9_entry.c b/arch/powerpc/kvm/book3s_hv_p9_entry.c index ea531f76f116..2e7498817b2e 100644 --- a/arch/powerpc/kvm/book3s_hv_p9_entry.c +++ b/arch/powerpc/kvm/book3s_hv_p9_entry.c @@ -281,8 +281,15 @@ bool load_vcpu_state(struct kvm_vcpu *vcpu, if (cpu_has_feature(CPU_FTR_TM) || cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) { - kvmppc_restore_tm_hv(vcpu, vcpu->arch.shregs.msr, true); - ret = true; + unsigned long guest_msr = vcpu->arch.shregs.msr; + if (MSR_TM_ACTIVE(guest_msr)) { + kvmppc_restore_tm_hv(vcpu, guest_msr, true); + ret = true; + } else { + mtspr(SPRN_TEXASR, vcpu->arch.texasr); + mtspr(SPRN_TFHAR, vcpu->arch.tfhar); + mtspr(SPRN_TFIAR, vcpu->arch.tfiar); + } } load_spr_state(vcpu, host_os_sprs); @@ -308,8 +315,16 @@ void store_vcpu_state(struct kvm_vcpu *vcpu) vcpu->arch.vrsave = mfspr(SPRN_VRSAVE); if (cpu_has_feature(CPU_FTR_TM) || - cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) - kvmppc_save_tm_hv(vcpu, vcpu->arch.shregs.msr, true); + cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) { + unsigned long guest_msr = vcpu->arch.shregs.msr; + if (MSR_TM_ACTIVE(guest_msr)) { + kvmppc_save_tm_hv(vcpu, guest_msr, true); + } else { + vcpu->arch.texasr = mfspr(SPRN_TEXASR); + vcpu->arch.tfhar = mfspr(SPRN_TFHAR); + vcpu->arch.tfiar = mfspr(SPRN_TFIAR); + } + } } EXPORT_SYMBOL_GPL(store_vcpu_state); -- 2.23.0