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h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Psocjzb6bowHSDioUIF9/6tvJDU4QGBRjJjxTFtyWDQk/oft1o4Ri+wYY8Q5qVirE kqBOewXMKNfLKWyfWfmRQDs0BAbqll4f1bcCNdAzPNx7tU7gy+7rGsnC5ILEr6UEo5 v1g7rqi1Aht05l0fIpjnwsguZWG6xUS2U2gJWyL4ZxAKLzo/36bVRfUZ9Qfj9OpRRJ MF3cO+ivHMYiYkd+66D0ig61BpdP0tNcsvHZSeuG7LX5q9xooHfyg4toVn00kxehkp 8qZq9va6WawQxeeOKd61ivw0oVChTUbrGK15k3D2Ndt7EX//ZubzVxK/gi6rxepOn1 6SredcbkRgL/w== From: "Aneesh Kumar K.V (Arm)" To: linux-coco@lists.linux.dev, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev Cc: "Aneesh Kumar K.V (Arm)" , Andrew Morton , Catalin Marinas , christian.koenig@amd.com, Jason Gunthorpe , Joerg Roedel , Marc Zyngier , Marek Szyprowski , Robin Murphy , Steven Price , Sumit Semwal , Suzuki K Poulose , Thomas Gleixner , Will Deacon , dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-media@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v7 10/13] swiotlb: Reject misaligned restricted DMA pools for CoCo guests Date: Mon, 21 Sep 2026 20:18:44 +0530 Message-ID: <20260921144847.501151-11-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260921144847.501151-1-aneesh.kumar@kernel.org> References: <20260921144847.501151-1-aneesh.kumar@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 4F97910000C X-Stat-Signature: jjdapss19t397gebh6w5onxuppz9geti X-Rspam-User: X-HE-Tag: 1790002235-544057 X-HE-Meta: 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 MgnLTkQW bBoCw++VB0XJOLg975DlhFGFvcgYg5ia01ZY07ErxU0ymBohNbAJBLYhSSzPUwbucROSPzMlPkyMMh1ugFI3SPsjQ2iX7Z1l2WUo/Ey4pyFsg2vAKCIcBFJaatuhTK7WTbkIQs1fBR8w5B5tWnv9HHnXgnXVjSIeshMhxCdXY1wD+jhkmYc3HfGtPg5aGn0Vc8cv0gEjrelqUHXHfaRQRorAunQQ5OxXM/9Gz4haxLl77DdU= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: A restricted DMA pool is a firmware-described ownership boundary. Unlike a pool allocated by SWIOTLB itself, its base cannot be moved and its size cannot be rounded without claiming memory outside the reserved region. Confidential-computing guests may require private/shared state changes to cover units larger than PAGE_SIZE. Passing a misaligned restricted region to set_memory_decrypted() can therefore fail. Validate both the physical base and the complete reserved size with the common CoCo shared-range helper before allocating SWIOTLB metadata or performing a state transition. Perform the transition through cc_make_shared(). Signed-off-by: Aneesh Kumar K.V (Arm) --- kernel/dma/swiotlb.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 9928d75efc2d..cb67105b8812 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -2010,6 +2010,14 @@ static int rmem_swiotlb_device_init(struct reserved_mem *rmem, return -EINVAL; } + if (cc_platform_has(CC_ATTR_MEM_ENCRYPT) && + !cc_shared_range_valid(rmem->base, rmem->size)) { + dev_err(dev, + "Restricted DMA pool must be aligned to %#zx bytes for memory encryption\n", + cc_shared_granule_size()); + return -EINVAL; + } + /* * Since multiple devices can share the same pool, the private data, * io_tlb_mem struct, will be initialized by the first device attached @@ -2043,8 +2051,7 @@ static int rmem_swiotlb_device_init(struct reserved_mem *rmem, int ret; mem->cc_shared = true; - ret = set_memory_decrypted((unsigned long)phys_to_virt(rmem->base), - rmem->size >> PAGE_SHIFT); + ret = cc_make_shared(phys_to_virt(rmem->base), rmem->size); if (ret) { dev_err(dev, "Failed to decrypt restricted DMA pool\n"); kfree(pool->areas); -- 2.43.0