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

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Date:   Tue, 30 Mar 2021 17:17:57 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     Eric Auger <eric.auger@...hat.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

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.