linux-kernel - Re: [PATCH v13 07/15] iommu/smmuv3: Allow stage 1 invalidation with unmanaged ASIDs

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Date:   Tue, 1 Dec 2020 13:33:10 +0000
From:   Xingang Wang <wangxingang5@...wei.com>
To:     <eric.auger@...hat.com>
CC:     <alex.williamson@...hat.com>, <eric.auger.pro@...il.com>,
        <iommu@...ts.linux-foundation.org>, <jean-philippe@...aro.org>,
        <joro@...tes.org>, <kvm@...r.kernel.org>,
        <kvmarm@...ts.cs.columbia.edu>, <linux-kernel@...r.kernel.org>,
        <maz@...nel.org>, <robin.murphy@....com>, <vivek.gautam@....com>,
        <will@...nel.org>, <zhangfei.gao@...aro.org>,
        <xieyingtai@...wei.com>
Subject: Re: [PATCH v13 07/15] iommu/smmuv3: Allow stage 1 invalidation with unmanaged ASIDs

Hi Eric

On  Wed, 18 Nov 2020 12:21:43, Eric Auger wrote:
>@@ -1710,7 +1710,11 @@ static void arm_smmu_tlb_inv_context(void *cookie)
> 	 * insertion to guarantee those are observed before the TLBI. Do be
> 	 * careful, 007.
> 	 */
>-	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
>+	if (ext_asid >= 0) { /* guest stage 1 invalidation */
>+		cmd.opcode	= CMDQ_OP_TLBI_NH_ASID;
>+		cmd.tlbi.asid	= ext_asid;
>+		cmd.tlbi.vmid	= smmu_domain->s2_cfg.vmid;
>+	} else if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {

Found a problem here, the cmd for guest stage 1 invalidation is built,
but it is not delivered to smmu.