Excerpts from Fabiano Rosas's message of February 25, 2021 6:36 am:
> Nicholas Piggin <npiggin@xxxxxxxxx> writes:
>
>> Switching the MMU from radix<->radix mode is tricky particularly as the
>> MMU can remain enabled and requires a certain sequence of SPR updates.
>> Move these together into their own functions.
>>
>> This also includes the radix TLB check / flush because it's tied in to
>> MMU switching due to tlbiel getting LPID from LPIDR.
>>
>> Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
>> ---
>
> <snip>
>
>> @@ -4117,7 +4138,7 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit,
>> {
>> struct kvm_run *run = vcpu->run;
>> int trap, r, pcpu;
>> - int srcu_idx, lpid;
>> + int srcu_idx;
>> struct kvmppc_vcore *vc;
>> struct kvm *kvm = vcpu->kvm;
>> struct kvm_nested_guest *nested = vcpu->arch.nested;
>> @@ -4191,13 +4212,6 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit,
>> vc->vcore_state = VCORE_RUNNING;
>> trace_kvmppc_run_core(vc, 0);
>>
>> - if (cpu_has_feature(CPU_FTR_HVMODE)) {
>> - lpid = nested ? nested->shadow_lpid : kvm->arch.lpid;
>> - mtspr(SPRN_LPID, lpid);
>> - isync();
>> - kvmppc_check_need_tlb_flush(kvm, pcpu, nested);
>> - }
>> -
>
> What about the counterpart to this^ down below?
>
> if (cpu_has_feature(CPU_FTR_HVMODE)) {
> mtspr(SPRN_LPID, kvm->arch.host_lpid);
> isync();
> }
Good catch, you're right that can be removed too.
Thanks,
Nick
