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Tue, 2 Jul 2024 06:21:09 +0000 Message-ID: Date: Tue, 2 Jul 2024 14:25:05 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/2] iommu/vt-d: Add helper to flush caches for context change To: Baolu Lu , "Tian, Kevin" , Joerg Roedel , Will Deacon , Robin Murphy , Jason Gunthorpe CC: "iommu@lists.linux.dev" , "linux-kernel@vger.kernel.org" References: <20240701112317.94022-1-baolu.lu@linux.intel.com> <20240701112317.94022-2-baolu.lu@linux.intel.com> <14a7db3a-663a-4e3f-b29c-a733e98efc32@linux.intel.com> <5a8802e3-feda-49bf-b11b-2ba6c236305e@linux.intel.com> <1c9204d9-d9da-4785-b375-368b5ba9ec78@linux.intel.com> Content-Language: en-US From: Yi Liu In-Reply-To: <1c9204d9-d9da-4785-b375-368b5ba9ec78@linux.intel.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SI2PR01CA0013.apcprd01.prod.exchangelabs.com (2603:1096:4:191::9) To DS0PR11MB7529.namprd11.prod.outlook.com (2603:10b6:8:141::20) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7529:EE_|IA1PR11MB7248:EE_ X-MS-Office365-Filtering-Correlation-Id: 68c5bb9b-feef-4dc9-4eb0-08dc9a5f29a9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014; 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>>>>> +        for (i = 0; i < info->pasid_table->max_pasid; i++) { >>>>> +            pte = intel_pasid_get_entry(info->dev, i); >>>>> +            if (!pte || !pasid_pte_is_present(pte)) >>>>> +                continue; >>>>> + >>>>> +            did = pasid_get_domain_id(pte); >>>>> +            qi_flush_pasid_cache(iommu, did, >>>>> QI_PC_ALL_PASIDS, 0); >>>>> +            iommu->flush.flush_iotlb(iommu, did, 0, 0, >>>>> DMA_TLB_DSI_FLUSH); >>>>> +        } >>>>> +    } >>>>> + >>>>> +    __context_flush_dev_iotlb(info); >>>>> +} >>>> this only invalidates devtlb w/o PASID. We miss a pasid devtlb >>>> invalidation >>>> with global bit set. >>> >>> I am not sure about this. The spec says "Global Device-TLB invalidation >>> to affected functions", I am not sure whether this implies any PASID- >>> based-Device-TLB invalidation. >> >> I just revisited the spec, Device-TLB invalidation only covers caches >> for requests-without-PASID. If pasid translation is affected while >> updating the context entry, we should also take care of the caches for >> requests-with-pasid. >> hmmm. "Table 25. Guidance to Software for Invalidations" only mentions global devTLB invalidation. 10.3.8 PASID and Global Invalidate of PCIe 6.2 spec has below definition. For Invalidation Requests that do not have a PASID, the ATC shall: • Invalidate ATC entries within the indicate memory range that were requested without a PASID value. • Invalidate ATC entries at all addresses that were requested with any PASID value. AFAIK. A devTLB invalidate descriptor submitted to VT-d should be converted to be a PCIe ATC invalidation request without PASID prefix. So it may be subjected to the above definition. If so, no need to have a PASID-based devTLB invalidation descriptor. >> I will add below line to address this. >> >> diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c >> index 9a7b5668c723..91db0876682e 100644 >> --- a/drivers/iommu/intel/pasid.c >> +++ b/drivers/iommu/intel/pasid.c >> @@ -932,6 +932,7 @@ void intel_context_flush_present(struct >> device_domain_info *info, >>                          did = pasid_get_domain_id(pte); >>                          qi_flush_pasid_cache(iommu, did, >> QI_PC_ALL_PASIDS, 0); >>                          iommu->flush.flush_iotlb(iommu, did, 0, 0, >> DMA_TLB_DSI_FLUSH); >> +                       pasid_cache_invalidation_with_pasid(iommu, did, i); > > Should be > >     devtlb_invalidation_with_pasid(iommu, info->dev, i); > > Sorry for the typo. > > Best regards, > baolu > -- Regards, Yi Liu