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SubjectRe: [PATCH v2 01/29] LoongArch: KVM: Add kvm related header files
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On 2/21/23 03:56, Tianrui Zhao wrote:
>>
>> In _kvm_check_vmid(), you already have
>>
>> +    if (migrated || (ver != old)) {
>> +        _kvm_update_vpid(vcpu, cpu);
>> +        trace_kvm_vpid_change(vcpu, vcpu->arch.vpid[cpu]);
>> +    }
>>
>> so a vpid will never be recycled if a vCPU migrates from physical CPU
>> A to B and back to A.
>>
>> So please keep the current VPID in the per-cpu struct vmcs, and you
>> can just copy it from there in _kvm_check_vmid().
>
> Thanks,  that is to say we should remove the vpid[NR_CPUS] array and it
> is enough to use only one vpid variable?

Yes, you need a vpid variable here and one in struct kvm_context.

Paolo

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