From: Aneesh Kumar K.V <aneesh.kumar@kernel.org>
To: Michael Kelley <mhklinux@outlook.com>,
"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
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Cc: Robin Murphy <robin.murphy@arm.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Steven Price <steven.price@arm.com>,
Suzuki K Poulose <Suzuki.Poulose@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Jiri Pirko <jiri@resnulli.us>, Jason Gunthorpe <jgg@ziepe.ca>,
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Heiko Carstens <hca@linux.ibm.com>,
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Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
"x86@kernel.org" <x86@kernel.org>, Jiri Pirko <jiri@nvidia.com>
Subject: RE: [PATCH v5 10/20] dma-direct: make dma_direct_map_phys() honor DMA_ATTR_CC_SHARED
Date: Tue, 02 Jun 2026 11:40:00 +0530 [thread overview]
Message-ID: <yq5acxy9scav.fsf@kernel.org> (raw)
In-Reply-To: <SN6PR02MB41574064D14D4A2734222C51D40B2@SN6PR02MB4157.namprd02.prod.outlook.com>
Michael Kelley <mhklinux@outlook.com> writes:
> From: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org> Sent: Thursday, May 21, 2026 9:28 PM
>>
>> Teach dma_direct_map_phys() to select the DMA address encoding based on
>> DMA_ATTR_CC_SHARED.
>>
>> Use phys_to_dma_unencrypted() for decrypted mappings and
>> phys_to_dma_encrypted() otherwise. If a device requires unencrypted DMA
>> but the source physical address is still encrypted, force the mapping
>> through swiotlb so the DMA address and backing memory attributes remain
>> consistent.
>>
>> Update the arm64, x86, s390 and powerpc secure-guest setup to not use
>> swiotlb force option
>>
>> Tested-by: Jiri Pirko <jiri@nvidia.com>
>> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
...
> With this patch removing SWIOTLB_FORCE from four places in
> kernel code, there are no remaining places where it is set.
> The test of SWIOTLB_FORCE could be removed from
> swiotlb_init_remap(), and its definition could be deleted
> from include/linux/swiotlb.h.
>
Sure, I’ll add that as a separate patch in the series.
-aneesh
next prev parent reply other threads:[~2026-06-02 6:10 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-22 4:27 [PATCH v5 00/20] dma-mapping: Use DMA_ATTR_CC_SHARED through direct, pool and swiotlb paths Aneesh Kumar K.V (Arm)
2026-05-22 4:27 ` [PATCH v5 01/20] [DO NOT MERGE] arm64/coco: Add pKVM as a CC platform Aneesh Kumar K.V (Arm)
2026-05-22 4:27 ` [PATCH v5 02/20] [DO NOT MERGE] s390: Expose protected virtualization through cc_platform_has() Aneesh Kumar K.V (Arm)
2026-05-22 15:35 ` JAEHOON KIM
2026-05-22 4:27 ` [PATCH v5 03/20] dma-direct: swiotlb: handle swiotlb alloc/free outside __dma_direct_alloc_pages Aneesh Kumar K.V (Arm)
2026-05-22 4:27 ` [PATCH v5 04/20] dma-direct: use DMA_ATTR_CC_SHARED in alloc/free paths Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 05/20] dma-pool: track decrypted atomic pools and select them via attrs Aneesh Kumar K.V (Arm)
2026-05-28 18:29 ` Michael Kelley
2026-06-02 6:05 ` Aneesh Kumar K.V
2026-06-02 14:24 ` Michael Kelley
2026-05-22 4:28 ` [PATCH v5 06/20] dma: swiotlb: pass mapping attributes by reference Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 07/20] dma: swiotlb: track pool encryption state and honor DMA_ATTR_CC_SHARED Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 08/20] dma-mapping: make dma_pgprot() " Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 09/20] dma-direct: pass attrs to dma_capable() for DMA_ATTR_CC_SHARED checks Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 10/20] dma-direct: make dma_direct_map_phys() honor DMA_ATTR_CC_SHARED Aneesh Kumar K.V (Arm)
2026-05-26 2:56 ` Michael Kelley
2026-05-26 15:39 ` Jason Gunthorpe
2026-06-02 6:10 ` Aneesh Kumar K.V [this message]
2026-05-22 4:28 ` [PATCH v5 11/20] dma-direct: set decrypted flag for remapped DMA allocations Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 12/20] dma-direct: select DMA address encoding from DMA_ATTR_CC_SHARED Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 13/20] dma-pool: fix page leak in atomic_pool_expand() cleanup Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 14/20] dma-direct: rename ret to cpu_addr in alloc helpers Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 15/20] dma-direct: return struct page from dma_direct_alloc_from_pool() Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 16/20] iommu/dma: Check atomic pool allocation result directly Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 17/20] dma: swiotlb: free dynamic pools from process context Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 18/20] dma: swiotlb: handle set_memory_decrypted() failures Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 19/20] dma: free atomic pool pages by physical address Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 20/20] swiotlb: Preserve allocation virtual address for dynamic pools Aneesh Kumar K.V (Arm)
2026-05-26 4:30 ` [PATCH v5 00/20] dma-mapping: Use DMA_ATTR_CC_SHARED through direct, pool and swiotlb paths Michael Kelley
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