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[34.142.255.199]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3074db528dcsm21257291eec.3.2026.06.08.10.53.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2026 10:53:49 -0700 (PDT) Date: Mon, 8 Jun 2026 17:53:43 +0000 From: Pranjal Shrivastava To: Samiullah Khawaja Cc: Marek Szyprowski , Will Deacon , Jason Gunthorpe , Pasha Tatashin , Mike Rapoport , Pratyush Yadav , Alexander Graf , Robin Murphy , Kevin Tian , iommu@lists.linux.dev, kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, David Matlack , Andrew Morton , Vipin Sharma Subject: Re: [RFC PATCH 1/4] dma: Add DMA allocation preservation KHO ABI Message-ID: References: <20260505002737.2213734-1-skhawaja@google.com> <20260505002737.2213734-2-skhawaja@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260505002737.2213734-2-skhawaja@google.com> On Tue, May 05, 2026 at 12:27:34AM +0000, Samiullah Khawaja wrote: > The DMA allocations can be backed by a variety of allocators. Add KHO > ABI for the preservation of contiguous allocations that are done through > dma-direct. > > Signed-off-by: Samiullah Khawaja > --- > include/linux/kho/abi/dma_alloc.h | 30 ++++++++++++++++++++++++++++++ > 1 file changed, 30 insertions(+) > create mode 100644 include/linux/kho/abi/dma_alloc.h > > diff --git a/include/linux/kho/abi/dma_alloc.h b/include/linux/kho/abi/dma_alloc.h > new file mode 100644 > index 000000000000..46e61db81abe > --- /dev/null > +++ b/include/linux/kho/abi/dma_alloc.h > @@ -0,0 +1,30 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +#ifndef _LINUX_KHO_ABI_DMA_ALLOC_H > +#define _LINUX_KHO_ABI_DMA_ALLOC_H > + > +#include > + > +/** > + * DOC: DMA Alloc ABI > + * > + * This header defines the structures used to serialize the state of DMA > + * allocations, done by device driver, across a Live Update. > + * > + * Only DMA allocations done through dma-direct that are contiguous and > + * allocated using alloc_page are supported. > + */ > + > +/** > + * struct dma_alloc_ser - Serialized state of a single DMA allocation > + * @page_phys: Physical address of the preserved pages > + * @size: Size of the DMA allocation > + * @force_decrypted: Whether the memory is force decrypted in previous kernel > + */ > +struct dma_alloc_ser { > + u64 page_phys; > + u64 size; > + u8 force_decrypted; Should we also stope attrs in this ser state here? There might be flags like DMA_ATTR_NO_KERNEL_MAPPING which would need to be preserved across a kexec? > + u8 padding[7]; > +} __packed; > + > +#endif /* _LINUX_KHO_ABI_DMA_ALLOC_H */ > -- > 2.54.0.545.g6539524ca2-goog > Thanks, Praan