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Wed, 8 Jul 2026 12:44:41 -0700 From: Nicolin Chen To: Will Deacon , Jason Gunthorpe , "Kevin Tian" , Lu Baolu CC: Robin Murphy , , David Woodhouse , , , Subject: [PATCH v3 5/5] iommu/vt-d: Convert nested cache invalidation to the core array loop Date: Wed, 8 Jul 2026 12:44:20 -0700 Message-ID: <15bf2bf57e7bca35fdfd8262d2524026bb7574d3.1783539724.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF00000209:EE_|PH7PR12MB6696:EE_ X-MS-Office365-Filtering-Correlation-Id: 7a9ec960-569a-4765-5ace-08dedd29616f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|376014|82310400026|23010399003|1800799024|5023799004|6133799003|11063799006|56012099006|22082099003|18002099003; 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The iommufd core now iterates the request array itself and re-invokes the op with the not-yet-handled sub-array, so handle just a single request per call out of the front of that sub-array and report one handled entry via the array->entry_num. An empty array keeps returning a success, used as a probe of IOMMU_HWPT_INVALIDATE_DATA_VTD_S1 support. Reviewed-by: Kevin Tian Assisted-by: Claude:claude-opus-4-8 Signed-off-by: Nicolin Chen --- drivers/iommu/intel/nested.c | 54 ++++++++++++++++++++---------------- 1 file changed, 30 insertions(+), 24 deletions(-) diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c index 2b979bec56cef..36e0e8e85c065 100644 --- a/drivers/iommu/intel/nested.c +++ b/drivers/iommu/intel/nested.c @@ -93,7 +93,7 @@ static int intel_nested_cache_invalidate_user(struct iommu_domain *domain, { struct dmar_domain *dmar_domain = to_dmar_domain(domain); struct iommu_hwpt_vtd_s1_invalidate inv_entry; - u32 index, processed = 0; + u32 processed = 0; int ret = 0; if (array->type != IOMMU_HWPT_INVALIDATE_DATA_VTD_S1) { @@ -101,31 +101,37 @@ static int intel_nested_cache_invalidate_user(struct iommu_domain *domain, goto out; } - for (index = 0; index < array->entry_num; index++) { - ret = iommu_copy_struct_from_user_array(&inv_entry, array, - IOMMU_HWPT_INVALIDATE_DATA_VTD_S1, - index, __reserved); - if (ret) - break; - - if ((inv_entry.flags & ~IOMMU_VTD_INV_FLAGS_LEAF) || - inv_entry.__reserved) { - ret = -EOPNOTSUPP; - break; - } - - if (!IS_ALIGNED(inv_entry.addr, VTD_PAGE_SIZE) || - ((inv_entry.npages == U64_MAX) && inv_entry.addr)) { - ret = -EINVAL; - break; - } - - cache_tag_flush_range(dmar_domain, inv_entry.addr, - inv_entry.addr + nrpages_to_size(inv_entry.npages) - 1, - inv_entry.flags & IOMMU_VTD_INV_FLAGS_LEAF); - processed++; + /* + * The core re-invokes this op for the remaining requests, so handle one + * request per call. A zero-length array only probes the type, validated + * above. + */ + if (!array->entry_num) + return 0; + + ret = iommu_copy_struct_from_user_array( + &inv_entry, array, IOMMU_HWPT_INVALIDATE_DATA_VTD_S1, 0, + __reserved); + if (ret) + goto out; + + if ((inv_entry.flags & ~IOMMU_VTD_INV_FLAGS_LEAF) || + inv_entry.__reserved) { + ret = -EOPNOTSUPP; + goto out; + } + + if (!IS_ALIGNED(inv_entry.addr, VTD_PAGE_SIZE) || + (inv_entry.npages == U64_MAX && inv_entry.addr)) { + ret = -EINVAL; + goto out; } + cache_tag_flush_range(dmar_domain, inv_entry.addr, + inv_entry.addr + + nrpages_to_size(inv_entry.npages) - 1, + inv_entry.flags & IOMMU_VTD_INV_FLAGS_LEAF); + processed = 1; out: array->entry_num = processed; return ret; -- 2.43.0