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 41C3BCC6B38 for ; Fri, 16 Oct 2026 09:46:25 +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-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=WBdGcxWiDrcVKqaT6IjY7dlU/wWj/hMB+CXmv51CihE=; b=KGSrHi2pGp6a/oi6Fog8e/UBL/ eIPzb50EyL4miGk/gcQNG365zGiIkTqe0rgXd0U5F+LGpxhiaVPd7Tn+p701dAB7uVDCIfKMMrj5E uf7tUYW++JDhiqcX+3og4J9MSmjQT2SWX/899B/eHvzXdTPr8xWsJ3m5roo5U+nCCPm9TvUYcKCbL 6ILQ0N1nfaPKUowl14RKCD9td0RmExSS0t49UPmnc7vDv1nhExdJVb5vBbBPmmbqyZ9L8zwn6QfCa jRihUSLeJKcIquMtBh5nFd/1chmSmFQo5iVVoZhhirwo96WkR91IU9/o0EDQx6KabrWVF3QFt4+zN gx3iwzQw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xHeW1-00000002Wte-1yFK; Fri, 16 Oct 2026 09:46:17 +0000 Received: from mail-wm1-x334.google.com ([2a00:1450:4864:20::334]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xHeVz-00000002WtC-092Z for linux-arm-kernel@lists.infradead.org; Fri, 16 Oct 2026 09:46:16 +0000 Received: by mail-wm1-x334.google.com with SMTP id 5b1f17b1804b1-4a01933b584so52872895e9.0 for ; Fri, 16 Oct 2026 02:46:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1792143973; x=1792748773; darn=lists.infradead.org; h=content-transfer-encoding:content-type:mime-version:references :in-reply-to:message-id:date:subject:cc:to:from:from:to:cc:subject :date:message-id:reply-to:content-type; bh=WBdGcxWiDrcVKqaT6IjY7dlU/wWj/hMB+CXmv51CihE=; b=EIZKuxn8mgWI9D0Fn/BHAtOptdK4H8YMI854BTuVlEwN79fQ6Yc4n7U2bx7UA2OBPA Olg4uIKiEwvEtuho+q3w51MVxHxBIh1QafsPShikIaEyft6nfwL7HifWUfrxcpxdLcaX oFKuRnTTxnKaR428SO3PbyJydTwaeh3WbR/njswSD+YHpMsOVRsskrB2DMS0YKmcm0Uu ChXKts8WAIErgPln0/TkJP8PV/AOKmM8f5gFLHwzwc5sjWdGYNR4lNpjfG8uHp876+fh iEHoNVyFacbawRdcJCYalqtmfflRWDT3v+d053N0dLm8zmUoEKzLgLQ5UrU0/TCc8uXC RHJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1792143973; x=1792748773; h=content-transfer-encoding:content-type:mime-version:references :in-reply-to:message-id:date:subject:cc:to:from:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=WBdGcxWiDrcVKqaT6IjY7dlU/wWj/hMB+CXmv51CihE=; b=OuuekygrqDPptBai6Hq+Gt1I74UVDmPEzfyykQ+rcskjCvDoDzPxP3cEqLmL5VxaNx kE/wMk7ciZDZEiQXZ2FHlxF/QJX28H/7uLUE0wVaTggjaRKkl3/4uD5yLqw2E2Ziw7Gi SQlmXxioc/GCarKa/Dxcl7DAwfyljkJO7VqmEkUpoNMK/P6+eMCzH5bjigzlWqiciLBp 7/HzSAziW2CcLCBVj98Jn7+3LBFLgKv1zQqKuRNbXY1Aclfzx5gJRtmxaB1xDAQyLzrX URr44qS1sibLU7FJ+pVGtNRrHh3U5eEB9yzlSjFvnRoAlflHFsT15UDYPxY9xH4tRgXf 9ChA== X-Forwarded-Encrypted: i=1; AKwUvBzn+FcRQFd7OtxeVjcW0MNkSVgWTjrkErNBaybtKI/2J1Tfh4Aih3JX0NSPUXJbQ+5flwiRsN5VCcTHBIzNp/nR@lists.infradead.org X-Gm-Message-State: AFq9FYLP8WrboO3FlXYWPw6JGepR4sz8Zp7Oj6mULr0mHEieIl5kOAje 6LAVkQ3VNpvP9HZDEKgmc3JdeQBxFHC0eu9EsIEf6SUvNTO9d98RRAPu X-Gm-Gg: AYBFou3hlQNjIY8svjfP356coGbj1m1DZuU68vb98K9QNe4d99MUwt8sWs88fQX/mUP Cq7hvBxi1+NgZmwTR3CNRQGEednOkuoG6UXAkng3EPLLVyZfDHtKFcD24da1GlEye3NnLZ/RNM1 B00eHMcxYecWXQW+naVpB3LG/d9gBxU0dZn51f48zMA1wNApF5CDp22ima6r/MVYpwxFoGbtdF7 aDQoFIanfuINb/vEI6fNsnwx5iAw4e7UTcrhW5KT65ajClyrts9+vv+fcD2iyNdORY8s5rwoC1+ wT0ZgXUMnAL9WQS0k+iEHL7oXrqqorGUGNa9uLqn1oNCSBeoTEyRYexM49yalmVuZoNyWTd6sic kTR5H2TaoVbdRQ46Uf1LXSgQZnuoNd3XyURs3/ep2BXZL0N4O/kJxI3EtnZcjwYC/kHNpZYs3Xq uFxWDWwYcnRoTAvPklLekVr6r6gQdLol10wfly53YEey7fGFMjB0pnUnZW4xivCQeBHpMo/+X9j kGgsw6nI41MDM6YX+FttgLavk7lnbLwN70xHHEYve+xICZzgGbSSzf9gynfKZuSWWqdXk/gRghk gBpwJFDCRjnrHlalzb/UsLGExg9SGrccaBc= X-Received: by 2002:a05:600c:83c6:b0:4a1:7093:40c7 with SMTP id 5b1f17b1804b1-4a18e493048mr406737735e9.8.1792143972697; Fri, 16 Oct 2026 02:46:12 -0700 (PDT) Received: from dev-dsk-fgriffo-1c-93421965.eu-west-1.amazon.com (54-240-197-234.amazon.com. [54.240.197.234]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a1cca43012sm17041055e9.3.2026.10.16.02.46.10 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 16 Oct 2026 02:46:12 -0700 (PDT) From: Fred Griffoul To: Paolo Bonzini , Sean Christopherson , Marc Zyngier , Oliver Upton , Catalin Marinas , Andrew Morton , David Hildenbrand , Alexander Viro , Christian Brauner , Jan Kara , Jason Gunthorpe , Kevin Tian , Joerg Roedel , Will Deacon , Robin Murphy , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Jonathan Corbet , Shuah Khan , Shuah Khan Cc: David Woodhouse , Ackerley Tng , "Aneesh Kumar K . V" , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Steffen Eiden , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org Subject: Re: [RFC PATCH v2 07/11] iommufd: Use large IOMMU pages for provider mappings Date: Fri, 16 Oct 2026 09:46:10 +0000 Message-ID: <20261016094610.57849-1-griffoul@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261016001448.GC14213@ziepe.ca> References: <20261014093733.90312-1-griffoul@gmail.com> <20261014093733.90312-8-griffoul@gmail.com> <20261016001448.GC14213@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261016_024615_086650_F4F37A23 X-CRM114-Status: GOOD ( 15.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Oct 15, 2026 at 09:14:48PM -0300, Jason Gunthorpe wrote: > You are going to need to go into generic_pt and implement cut and a > more suitable unmap to make this stuff work properly. We can't over > unmap on conversions. Agreed. I'll drop this patch from v3 for now. Just to check I understand what you have in mind: a cut operation in generic_pt that splits a large entry in place into smaller ones, so that the revoke unmaps exactly its range, and iommufd uses large pages only on domains that support it? > Also please don't write commit messages with AI. WTF is this even > trying to say? The subject is "use large pages" and this text says > "map each page with its own call" Sorry about that. It goes away with the patch, and I'll check and rewrite the other commit messages for v3. Fred