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Subject: Re: [PATCH v14 06/13] iommu/smmuv3: Allow stage 1 invalidation with
 unmanaged ASIDs
To:     Eric Auger <eric.auger@redhat.com>
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References: <20210223205634.604221-1-eric.auger@redhat.com>
 <20210223205634.604221-7-eric.auger@redhat.com>
From:   Zenghui Yu <yuzenghui@huawei.com>
Message-ID: <7a270196-2a8d-1b23-ee5f-f977c53d2134@huawei.com>
Date:   Tue, 30 Mar 2021 17:17:57 +0800
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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.