From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D3D57CD343A for ; Tue, 5 May 2026 00:27:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:Cc:To:From: Subject:Message-ID:References:Mime-Version:In-Reply-To:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=b+FOv1S5jZxTI8xiOq/TIFYAKVGB2GSKJ5eXMG7ksgc=; b=ijd61SRb5Zz/DS4zzsBRJ7Aihv CxYxcUarzl67Xzu0KfJKHQ+YscdMNKL3+TtjcK3DaL/nqg9iwZf9wxeZi7faWBYVBxdX9DDTpQkS2 zc9PXAU5ez4uR6ML3RAweTB+2QhCSXW2uLPR95b1K6Hgxox8Tv91cPaOuHh5gChGRM2FtzLqyofMu 6nnF+tFxeJk00do65X+YiVgI+0BMqDB+EwFRO/gS196WMdUySHJmB+MfmiQelfkbSlFzlasKszfUk WV8HtPWXpdk2GYWO4cjrYd8btdmo/XuTYh19ukvt9jnrMRfxX70Gwumi9cgdIr/nMmK5iXFqnzwJB S24AYKvg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wK3dY-0000000EiSB-2lsS; Tue, 05 May 2026 00:27:44 +0000 Received: from mail-pf1-x44a.google.com ([2607:f8b0:4864:20::44a]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wK3dW-0000000EiR2-1HO6 for kexec@lists.infradead.org; Tue, 05 May 2026 00:27:43 +0000 Received: by mail-pf1-x44a.google.com with SMTP id d2e1a72fcca58-83603145987so1050625b3a.2 for ; Mon, 04 May 2026 17:27:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1777940861; x=1778545661; darn=lists.infradead.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=b+FOv1S5jZxTI8xiOq/TIFYAKVGB2GSKJ5eXMG7ksgc=; b=dXMgutA7RnGXNAQa+moPQhIvyTaKYLV4gQcEX4MnzeqjBcwrD0M/939wp9G30U4sIy VqPSF713jrASRS3E9u+/Wc2/v3gOKx1egeHuixbVj1ErLI2yhMq9yzqt1r2llFR4DlIg fUtDRXW2aNCHAmymDcm2HgG1FB1j6DcD19yCV+HynpEEh4YowqAW+KGjzX/zqIY4XidH t4Zypc+4tz09bJM0bP+r7MTrZ2EWA33cdqcSSbfoTrL0WM0K2CXvUMvyVh1PLccIpKsV Xdqo0HKtuXmGFIN8hwHePwaI+6VmRTE1Kv7B3MhRRLEsnvIfdjaxSYm3a2eTJgs2NX6F degQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777940861; x=1778545661; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=b+FOv1S5jZxTI8xiOq/TIFYAKVGB2GSKJ5eXMG7ksgc=; b=eLI1U9xgew+cLVOdxFPcMXSAAk0uPuCFxc8HCc1hu0dB/9wzfTybZcv+9OGgIPwVVQ b7kdgnwZzjspa4L3HmxkHE3RvD11yO4+DSVSqMaj0pT/5bAUd5tu+pBxREsYOb8BlJA+ x4PwfATGkSC6nmP4mtgzJICJskIuN6e5YTYUj15UKy1eEIZAnOUuI1cfKYQu5s1lCPwF uilI0fDyIi/2zf3E2L/NlVvVWeQZrnXkzCu99wX1ACwNkEggG3WrryE2MLquklNwoXkx DYTMc/Ad8C7pJEHbqjkIQOGdpOrjxQiD/359O4uVe5NG9Z5BLvaVVf4rXPvu0wjbOQMS KtIw== X-Forwarded-Encrypted: i=1; AFNElJ/i7L3nyxbmB4+A/29vyaSeHZxKvWdPI4wVhOxLhfoTKpnonUsT7Nv7ITni1zQttW3BS5DwJg==@lists.infradead.org X-Gm-Message-State: AOJu0Yy1+mTsIJm+KA9pJ1wQ7Mq/kcDgOnyrDpvU/ktg0gEKeHjjrHHA nMVPlZu7e4lbwP+KoutaNpsBZ++qx6Bhi/2Z5X2DtekL7S0lsjLAq9vXxMMGji2TK1mnqh9POjp m9Cx9uVqzsfdNMg== X-Received: from pfnj5.prod.google.com ([2002:aa7:83c5:0:b0:82f:8a3b:87f0]) (user=skhawaja job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:1f04:b0:836:5c3c:2051 with SMTP id d2e1a72fcca58-83923d96a31mr1009427b3a.23.1777940860319; Mon, 04 May 2026 17:27:40 -0700 (PDT) Date: Tue, 5 May 2026 00:27:34 +0000 In-Reply-To: <20260505002737.2213734-1-skhawaja@google.com> Mime-Version: 1.0 References: <20260505002737.2213734-1-skhawaja@google.com> X-Mailer: git-send-email 2.54.0.545.g6539524ca2-goog Message-ID: <20260505002737.2213734-2-skhawaja@google.com> Subject: [RFC PATCH 1/4] dma: Add DMA allocation preservation KHO ABI From: Samiullah Khawaja To: Marek Szyprowski , Will Deacon , Jason Gunthorpe Cc: Samiullah Khawaja , 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 , Pranjal Shrivastava , Vipin Sharma Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260504_172742_343029_00F501F0 X-CRM114-Status: GOOD ( 13.55 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org 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; + u8 padding[7]; +} __packed; + +#endif /* _LINUX_KHO_ABI_DMA_ALLOC_H */ -- 2.54.0.545.g6539524ca2-goog