linux-kernel - Re: [PATCH v14 06/13] iommu/smmuv3: Allow stage 1 invalidation with unmanaged ASIDs

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Date:   Thu, 1 Apr 2021 11:38:16 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Zenghui Yu <yuzenghui@...wei.com>
Cc:     eric.auger.pro@...il.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu, will@...nel.org, maz@...nel.org,
        robin.murphy@....com, joro@...tes.org, alex.williamson@...hat.com,
        tn@...ihalf.com, zhukeqian1@...wei.com,
        jacob.jun.pan@...ux.intel.com, yi.l.liu@...el.com,
        wangxingang5@...wei.com, jiangkunkun@...wei.com,
        jean-philippe@...aro.org, zhangfei.gao@...aro.org,
        zhangfei.gao@...il.com, vivek.gautam@....com,
        shameerali.kolothum.thodi@...wei.com, nicoleotsuka@...il.com,
        lushenming@...wei.com, vsethi@...dia.com,
        wanghaibin.wang@...wei.com
Subject: Re: [PATCH v14 06/13] iommu/smmuv3: Allow stage 1 invalidation with
 unmanaged ASIDs

Hi Zenghui,

On 3/30/21 11:17 AM, Zenghui Yu wrote:
> On 2021/2/24 4:56, Eric Auger wrote:
>> @@ -1936,7 +1950,12 @@ static void
>> arm_smmu_tlb_inv_range_domain(unsigned long iova, size_t size,
>>           },
>>       };
>>   -    if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
>> +    if (ext_asid >= 0) {  /* guest stage 1 invalidation */
>> +        cmd.opcode    = smmu_domain->smmu->features &
>> ARM_SMMU_FEAT_E2H ?
>> +                  CMDQ_OP_TLBI_EL2_VA : CMDQ_OP_TLBI_NH_VA;
> 
> If I understand it correctly, the true nested mode effectively gives us
> a *NS-EL1* StreamWorld. We should therefore use CMDQ_OP_TLBI_NH_VA to
> invalidate the stage-1 NS-EL1 entries, no matter E2H is selected or not.
> 

Yes at the moment you're right. Support for nested virt may induce some
changes here but we are not there. I will fix it and add a comment.
Thank you!

Best Regards

Eric