From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qv1-f51.google.com (mail-qv1-f51.google.com [209.85.219.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EDC5E399D0B for ; Tue, 12 May 2026 12:42:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778589738; cv=none; b=QaeYA6nqDhZjAehLVkgH2MYE+iU09SBm9t8rT+2lEueZtccdu+KPOyAGGDza3fn5eQWGyW7I+eHurRJN5Ro/UvriTmZQCkCoozqSy7KCvFi99MmwrrPdL+8IBCW9a3zlFztSweB7j3wGv1KLJrxd0efRaS58LLfnzi1k01Hw99A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778589738; c=relaxed/simple; bh=XacGqqjY7f28dJK0VP+hWV0B7qKiIryK0mnYuhxZT/I=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=V9cMAXpiBMXJ8POKz5UrWNiU0fhLAcOTD+x5AI3akTse3raJADiuYchqy2GhncCSvuLNywyZF2q9K6s9r79djofbryzDIJCrqXsWOAN1s1mb6W6WRtIsZEIRV1zoKkPDMX6sYQrEcxNR9nHptvpVs0/RIDaPM68f7BfyqgA9BgY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca; spf=pass smtp.mailfrom=ziepe.ca; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b=JJX8vZIe; arc=none smtp.client-ip=209.85.219.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="JJX8vZIe" Received: by mail-qv1-f51.google.com with SMTP id 6a1803df08f44-899a5db525cso34031116d6.3 for ; Tue, 12 May 2026 05:42:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; t=1778589728; x=1779194528; darn=lists.linux.dev; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=3BKLJTgpu0lhPLPV6W4sX1a9F3kFqCKUQrD+DI4v8Lc=; b=JJX8vZIetcIDn/oiPCrwpcHxQcvz3Ct6nzRbmjlfSSpreTRHBF3fQ3OH+iE9ofo8fE 9JTwkuhKgMNKiZOF3jdZ19B7ZkHOoEZMgQAEQXA+BwgekYgd9iqP3dnM4J7WEPVpECuw SuLLMdxxhFUTvc81SNHjKT6HNhesa3HlWCPBCp11KbfTntsoqRbZp9pAslQGXUdrvtR7 hsd3mI+LnxmRCbc9ucwFznzJePBvjDO8HNjvb7OGTVqNpFCWhSP93W3hTKCJYtEwLGL5 oQ9yzVSnmV2ECwvAe7s7C3NGSB6pBjQuBo/f5lqgiRgim4eH8a1L5jNAghfgXVi0PazB vJjA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778589728; x=1779194528; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=3BKLJTgpu0lhPLPV6W4sX1a9F3kFqCKUQrD+DI4v8Lc=; b=X4ULDAW2RrRXGz/+UZuFSrk3CbMBM5ZF7ZFnATmaS7okSDvAqE35AM78P1qRLyNKyu ScILNF3eq40E8L/4tEWpn/g5xGVOQcZMX3qOwCquR7qYL65Pn5QLJ3S2jUIgV98N9Zsr vfsMTPfy3F5PF3QF+rWUoZCym8OJW+00Mu4gztBCHD8mTrUSOlRQ8FGFotDXCx9no2G4 l/BgR1hBDfKWeYNjw8emGPuByfcshNzNV4iGrx/YgKCkRoNYf4QpgiugS7l01PwHz6Rq 1DiV0moUNtQ7ShJi9VouCpgmJ6VIDK1dc/dl+VgBr0YuOqq/nj6hyy9gHgVzlJwpQz2p rMZA== X-Forwarded-Encrypted: i=1; AFNElJ/PsVnOBrdvqQNJCzIKgnBpKCqM0m2UuNpOMXEgSriJ17NFKmsQeYbMiPL/QD/E2ya3JihpEg==@lists.linux.dev X-Gm-Message-State: AOJu0YyAbjLqlqzGAkVBlm9RlaHype1xAl7BiLXy8QMX13s3hZcFNLu6 aNJgSD+mhPF0v/D4KXWqGlW9NlHIesb0sGLISeZjNeM1PNYyIw9zj5LDa+6PkGlCux4= X-Gm-Gg: Acq92OGCt2aYHYh6goR8NyNDQK9bxiVguGLUs+4t8u7gr7ZdgTIQEE77WxbigLMinZg ohx8MZmLhMox5k9erRyU2+CumBD9FLY/acEinH2hStYcTXkK0wRfnojcdZ2kE8HhaxCco73nSfy +dRfu1sD/h6uShs4zqHOR8BdC61LnOr/uPzdJCVflYeGxC2aF5noj03BYr3ZfNRSfxtkKye7cx2 uTR5xYOa3uwfzCUNajZqTNq4XiYdb/Hu1KtoxdwS9FINCv8ZpsDP7aYCH/N4BOdH6SjB/G7SufB nsQ91yHyhTsajJo/eMryOcWHnJS/U7K3E1zUyq3dwDhV/kz6M/X+OC1uOvEa7VqiAhyVnFc/lcB ey7lq06Ru6co4pvCGvsAqXHu1ajmWKpbzRoiXS1bIed4e83uY/O4Amc7BzECbdLSme4SSg52H51 eMmIV3Hm6sy4KBX20h+QOnh5o59G3q/15akFXO8DjttUyEJAWFDBJuy+EAR8t0SrLDxoC8u2hGu 6KwEg== X-Received: by 2002:a05:6214:5b09:b0:8a2:97cc:af82 with SMTP id 6a1803df08f44-8bc449afde3mr448027066d6.27.1778589727408; Tue, 12 May 2026 05:42:07 -0700 (PDT) Received: from ziepe.ca (crbknf0213w-47-54-130-67.pppoe-dynamic.high-speed.nl.bellaliant.net. [47.54.130.67]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8b53d6442d0sm338851976d6.46.2026.05.12.05.42.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 May 2026 05:42:06 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wMmR4-00000005AmI-1e6f; Tue, 12 May 2026 09:42:06 -0300 Date: Tue, 12 May 2026 09:42:06 -0300 From: Jason Gunthorpe To: Mostafa Saleh Cc: Catalin Marinas , "Aneesh Kumar K.V (Arm)" , iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Robin Murphy , Marek Szyprowski , Will Deacon , Marc Zyngier , Steven Price , Suzuki K Poulose , Jiri Pirko , Petr Tesarik , Alexey Kardashevskiy , Dan Williams , Xu Yilun Subject: Re: [PATCH v3 0/9] dma-mapping: Use DMA_ATTR_CC_SHARED through direct, pool and swiotlb paths Message-ID: <20260512124206.GV9285@ziepe.ca> References: <20260427055509.898190-1-aneesh.kumar@kernel.org> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Mon, May 11, 2026 at 11:13:43AM +0000, Mostafa Saleh wrote: > On Fri, May 08, 2026 at 06:28:11PM +0100, Catalin Marinas wrote: > > On Mon, Apr 27, 2026 at 11:25:00AM +0530, Aneesh Kumar K.V (Arm) wrote: > > > This series propagates DMA_ATTR_CC_SHARED through the dma-direct, > > > dma-pool, and swiotlb paths so that encrypted and decrypted DMA buffers > > > are handled consistently. > > > > I think this series makes sense, using DMA_ATTR_CC_SHARED throughout the > > DMA API, either for alloc or for streaming to decide/check what bouncing > > does. Sashiko has a few interesting reports, it probably breaks s390 as > > well (it might be similar to the pKVM case). > > I have this series on my review list, I believe there is an overlap with > my series, I can rebase mine on top of this if that makes sense, I will > probably wait for a new version to address the current comments and > Sashiko notes. I've been wondering about the two series as well.. I think this is a big help to your project, but it would be nice to know?? Jason