From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qk1-f176.google.com (mail-qk1-f176.google.com [209.85.222.176]) (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 ECB46222585 for ; Tue, 16 Dec 2025 00:58:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.222.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765846719; cv=none; b=MiTACwc/wESahOercrfXTPaM2373Cx1UrcWwHaQS+FMobyYX4bRrOcfS/1F9kcGrWZ5mfb2Q4w5SMZopEPBRslmZ51ilWnAdsRLPgge5dejB3bvygKxMw1QGD8+ifnRbSdl0tAYwJSTo2B5D9AS+6UvmFhtt4tgmbHBTQMS8ZI0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765846719; c=relaxed/simple; bh=GeX6NVbppM2GsiOCZwgdWG2OXHBblO2gL54N7qIuEWs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=sAAvE+0tlpxYHJGwTEW4WnE4bz+NPO+0XCZnUGPF0XRqXcF9eCbHeoAeGhLjgcsq0c71Y0A+qI5Xcwxv7wVy2bGgiynUODv+OihoImNwJrU0F2fYDvo487H3ej7KPTtsCxvN2dZwQOi4OQtvhw3dO5Y04l1Zb7w5SBPJizTISLM= 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=j2YQSly7; arc=none smtp.client-ip=209.85.222.176 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="j2YQSly7" Received: by mail-qk1-f176.google.com with SMTP id af79cd13be357-8b144ec3aa8so392005785a.2 for ; Mon, 15 Dec 2025 16:58:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; t=1765846717; x=1766451517; 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=DrHNT0ZwzeHqirYSDva6eOqkz8F2/giVsByWb392zck=; b=j2YQSly7CzAumJItePmRnBl5Bo9JXJrXstebjELnb6sz5uXVlmozL8+tuLIbAytauu ffSHwAGXaRH3O9ro/lLHDmHnc9EvmZWQAOvaQ0tAfha8lDXaYfS9HtHrgCJaQEzA0Mwn kSVQvtM+QnwzzuSTQRQkZadFAnrbjCJfMKFNGGhXFZrE4xlpFdIohjXBTs3YJ6QVOtLI s5CbeoQcTAymWiBgww8GfwNmKyXaWseC/D3BrbkA6xaMLdt/8FQyuUDgRKItPx9SSncl ylJJqxLowKtVIzwqKDHzbd8uXsrULoL/FRkspEE3mdokNVlZtG0Qdh+C5IKnXQ8s2RyU RZDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765846717; x=1766451517; 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=DrHNT0ZwzeHqirYSDva6eOqkz8F2/giVsByWb392zck=; b=ZjKcfP+8ZofdcBrRiy8I+SPM6Gxsuodxhb8YihV+cCsztgJ6tPZwT1a3aCZLwg9ZwE 87kV1EhOCeIGYbhDcJ1z50jLv6/4chZwGXZ//01krDsV8DcSXKSBQaA4ACbymfKfLC36 sfbrIp0qopqGtxZHcOh3PzvUArequDLwudWG1JyPCREpteq8Rbxk6ZKtvYV9853ZyPFv xlEV88kdMvLmeaJLIcgjwn1ir/FBXWrRDMAPUP6P2yaSTJwE++CuTCeu9BGVVYjv/v+A N77yMPd/J9Q7KyoGSBvqoop/InmRL6riNsiwe21fej2G/nZFuL+12jGeof05aFJGzFIJ LouA== X-Forwarded-Encrypted: i=1; AJvYcCXUssZRfBoBMGfjL14GXkCGiyrF5W/7lkSb09VntVyfD0ZrU2i1oWoozH/SDZz1Je/M5FpcsAk=@lists.linux.dev X-Gm-Message-State: AOJu0Yw9vokdqkiAkWzXlj4v513J3Z+L2Lk+MTiHhT13Xwox2x9DvCj8 CXkU8BYWHy0z2+zWZPJisil/IuAwP+48dxRmYwXQnf/wbTidfuenmFxXzkSONv+/bmU= X-Gm-Gg: AY/fxX4HnefCfA4W2vuNnkiq3iwFlTVsw9vjgoIc0vrrna6i3Bm9JkuoFGNTWlWBXWE Pbw61Nj32K+az0F7WTAh7fWltIpYFF0KDsDLK1vFoNR/vUlz0P/COvBKe7+Vbrp+G4IbmOL8UGz 7tqdTLyH6IP65JYwMlPT4ql1hJwayGNXCMU6G+J3u0gxmjbSaIO/Wp/CfdA+t/idfh8LCMzf5FU CUD4vFfJPQiF5kgg2rrzXYhoS0dxdYXwrevYbSbdIkP/QCGWF2TICbwL3FehjDoTdfxSHllNjKb roQ4IDECS41yzYNynNgYIZF7X4L0TLnQz2JYYGPyXNYE3lhW7TNE/oMzwaMtUB169/eyU4fYjh2 KejmhlkI02brZkWIWiD9LXAjTB7BZgrKVm7T+7S5DqexZN9jY8UEDFMVtuFix66zylABvhXb93K hpFEfuag78GJaTva62N8uPEw34de40DYkINEYxeuep+N1VyT/yrI3WfwIO X-Google-Smtp-Source: AGHT+IHK7ERi0e8OdQxsP0t8K4Zuz+cR8Z/0Up6pTGFh+jCgiiMooXvue23D3Qf/UTTuC5ib3dsdcw== X-Received: by 2002:a05:620a:4002:b0:89e:67a9:fced with SMTP id af79cd13be357-8bb3b359498mr1796140685a.66.1765846715921; Mon, 15 Dec 2025 16:58:35 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-47-55-120-4.dhcp-dynamic.fibreop.ns.bellaliant.net. [47.55.120.4]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8be31b55a32sm72625785a.28.2025.12.15.16.58.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Dec 2025 16:58:35 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1vVJOc-000000008ML-3OBX; Mon, 15 Dec 2025 20:58:34 -0400 Date: Mon, 15 Dec 2025 20:58:34 -0400 From: Jason Gunthorpe To: Mostafa Saleh Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, iommu@lists.linux.dev, catalin.marinas@arm.com, will@kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, joro@8bytes.org, jean-philippe@linaro.org, praan@google.com, danielmentz@google.com, mark.rutland@arm.com, qperret@google.com, tabba@google.com Subject: Re: [PATCH v5 04/27] iommu/io-pgtable-arm: Factor kernel specific code out Message-ID: <20251216005834.GC31492@ziepe.ca> References: <20251117184815.1027271-1-smostafa@google.com> <20251117184815.1027271-5-smostafa@google.com> <20251128164541.GA812105@ziepe.ca> Precedence: bulk X-Mailing-List: kvmarm@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 Fri, Dec 12, 2025 at 03:37:43PM +0000, Mostafa Saleh wrote: > On Fri, Nov 28, 2025 at 12:45:41PM -0400, Jason Gunthorpe wrote: > > On Mon, Nov 17, 2025 at 06:47:51PM +0000, Mostafa Saleh wrote: > > > Some of the used APIs are only part of the kernel and are not > > > available in the hypervisor, factor those out: > > > - alloc/free memory > > > > Why not provide the iommu-pages API for the hypervisor environment? > > > > Same for virt_to_phys, that could be moved into an iommu-pages wrapper > > too.. > > I guess that's possible, but then we would have to stub dma_map/unmap, > which might a bit ugly. I will look more into it. I am hoping to drop the dma_map/unmap and replace it with an arch cache flush call directly since the code is no longer modular and relying on the DMA API will have some problems with a future patch series I'm expecting.. Jason