linux-kernel - [PATCH 2/2] drivers/arm-smmu-v3: Implement .iotlb_sync

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20250927223953.936562-2-danielmentz@google.com>
Date: Sat, 27 Sep 2025 22:39:53 +0000
From: Daniel Mentz <danielmentz@...gle.com>
To: iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Cc: Will Deacon <will@...nel.org>, Mostafa Saleh <smostafa@...gle.com>, 
	Pranjal Shrivastava <praan@...gle.com>, Liviu Dudau <liviu.dudau@....com>, Jason Gunthorpe <jgg@...dia.com>, 
	Rob Clark <robin.clark@....qualcomm.com>, Daniel Mentz <danielmentz@...gle.com>
Subject: [PATCH 2/2] drivers/arm-smmu-v3: Implement .iotlb_sync_map callback

Implement .iotlb_sync_map callback based on the new callback in the
io-pgtable code.

Signed-off-by: Daniel Mentz <danielmentz@...gle.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 2a8b46b948f0..0ffcc6c8e4bf 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2541,6 +2541,7 @@ static int arm_smmu_domain_finalise(struct arm_smmu_domain *smmu_domain,
 	pgtbl_cfg = (struct io_pgtable_cfg) {
 		.pgsize_bitmap	= smmu->pgsize_bitmap,
 		.coherent_walk	= smmu->features & ARM_SMMU_FEAT_COHERENCY,
+		.defer_sync_pte	= true,
 		.tlb		= &arm_smmu_flush_ops,
 		.iommu_dev	= smmu->dev,
 	};
@@ -3366,6 +3367,18 @@ static int arm_smmu_map_pages(struct iommu_domain *domain, unsigned long iova,
 	return ops->map_pages(ops, iova, paddr, pgsize, pgcount, prot, gfp, mapped);
 }
 
+static int arm_smmu_iotlb_sync_map(struct iommu_domain *domain,
+				    unsigned long iova, size_t size)
+{
+	struct io_pgtable_ops *ops = to_smmu_domain(domain)->pgtbl_ops;
+
+	if (!ops || !ops->iotlb_sync_map)
+		return 0;
+
+	ops->iotlb_sync_map(ops, iova, size);
+	return 0;
+}
+
 static size_t arm_smmu_unmap_pages(struct iommu_domain *domain, unsigned long iova,
 				   size_t pgsize, size_t pgcount,
 				   struct iommu_iotlb_gather *gather)
@@ -3700,6 +3713,7 @@ static const struct iommu_ops arm_smmu_ops = {
 		.map_pages		= arm_smmu_map_pages,
 		.unmap_pages		= arm_smmu_unmap_pages,
 		.flush_iotlb_all	= arm_smmu_flush_iotlb_all,
+		.iotlb_sync_map		= arm_smmu_iotlb_sync_map,
 		.iotlb_sync		= arm_smmu_iotlb_sync,
 		.iova_to_phys		= arm_smmu_iova_to_phys,
 		.free			= arm_smmu_domain_free_paging,
-- 
2.51.0.570.gb178f27e6d-goog