From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.14]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 03096175A7E; Thu, 4 Jun 2026 02:45:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.14 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780541151; cv=none; b=f4yXxMMK3poe8od9tpVMnT5kFaO9/l//tcfp5skJQvS7oNVBEdJRnwtWi9RjnCfq5zVg2xCXv5WQkCJEIDMNpzPtJeSgTy8JBLVnTx3LzblUXO6ALkdQ9i2X/CZ+2IF5t9yVziNBzqHE5Pj95PudklbvrN93qw+DtuoBBV75qJ0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780541151; c=relaxed/simple; bh=zwaEOC72aj4r75+dKErQgCh/I2UYQPGFQIzWi9Bh55Y=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=HZptAujP1C0T9u09hA6xE2AP8Yl1ykSDJxu1WGJFRpX9Om02OXOEW9HBgpgrD1JzuDySszQiG95fIdWnZG7ieclJQwgytAeCc5NWsnVImPWcB7f5GgxkU8ZT0prLlW1uQlXjgzlzg5J9KXwkcNiiyJI+Mq7+Y7emh7xs2Eu9J3Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Q59NykEs; arc=none smtp.client-ip=192.198.163.14 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Q59NykEs" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1780541150; x=1812077150; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=zwaEOC72aj4r75+dKErQgCh/I2UYQPGFQIzWi9Bh55Y=; b=Q59NykEs2yiaUSVoE6zHmVyHmAlYiQWZoyUWIqOpCXQczH1Db19kIbI6 tM8jOtLfB1Z9DpVrxE3DdrLKSFgdW8A/mDBgNVvhGWFCCiFnMsdGIIZYY pt3wPm/OnNvvH0UIBPc4ogwzBek0ap8FokWdymTKQuWom9BGHF3a47Ljm PftZ9Zb4nTQajqZ7x+Af+IBJDejklY/fr7Wf3rsgKDysAco2AwCK4DKEK 2fBrzXrKtU4bcYwbRXPr1TOxrl7+jbKjzTXiAyIKiZII8wZE2qTCo8K1k tdISjGMnMewAfbmcWWSl8e8BJXtLX34GFZhh1/M2IzeYwvRZ1VH2wNeb8 A==; X-CSE-ConnectionGUID: Grsfj8wER4GrJLJxLxk4xw== X-CSE-MsgGUID: zQfBGPgdT5qKBm+yj4+Bkg== X-IronPort-AV: E=McAfee;i="6800,10657,11806"; a="81394970" X-IronPort-AV: E=Sophos;i="6.24,186,1774335600"; d="scan'208";a="81394970" Received: from orviesa008.jf.intel.com ([10.64.159.148]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Jun 2026 19:45:49 -0700 X-CSE-ConnectionGUID: S4I3acvjTca0y7rBk61R5g== X-CSE-MsgGUID: OCypOtVWTQWlA8M8EeXAjg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.24,186,1774335600"; d="scan'208";a="244260671" Received: from allen-sbox.sh.intel.com (HELO [10.239.159.30]) ([10.239.159.30]) by orviesa008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Jun 2026 19:45:43 -0700 Message-ID: <633995b3-f534-49ef-9bb5-2ebebfc2d443@linux.intel.com> Date: Thu, 4 Jun 2026 10:44:46 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 01/32] iommu: introduce iova_to_phys_length in iommu_domain_ops To: Guanghui Feng , jgg@ziepe.ca Cc: adrian.larumbe@collabora.com, airlied@gmail.com, alex@shazbot.org, alikernel-developer@linux.alibaba.com, boris.brezillon@collabora.com, dri-devel@lists.freedesktop.org, dwmw2@infradead.org, iommu@lists.linux.dev, joro@8bytes.org, kevin.tian@intel.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, liviu.dudau@arm.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, oliver.yang@linux.alibaba.com, robh@kernel.org, robin.murphy@arm.com, shiyu.zsq@linux.alibaba.com, steven.price@arm.com, suravee.suthikulpanit@amd.com, tzimmermann@suse.de, wei.guo.simon@linux.alibaba.com, will@kernel.org, xlpang@linux.alibaba.com References: <20260602104637.1219810-1-guanghuifeng@linux.alibaba.com> <20260603151804.1963871-1-guanghuifeng@linux.alibaba.com> <20260603151804.1963871-2-guanghuifeng@linux.alibaba.com> Content-Language: en-US From: Baolu Lu In-Reply-To: <20260603151804.1963871-2-guanghuifeng@linux.alibaba.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 6/3/26 23:17, Guanghui Feng wrote: > Add iova_to_phys_length callback to struct iommu_domain_ops alongside > the existing iova_to_phys. The new callback returns both the physical > address and the PTE mapping page size in a single page table walk. > > Add iommu_iova_to_phys_length() core function that: > - Checks ops->iova_to_phys_length first (preferred path) > - Falls back to ops->iova_to_phys for unmigrated drivers > > This enables callers like VFIO to efficiently traverse IOVA space > by actual mapping granularity instead of fixed PAGE_SIZE steps. > > Signed-off-by: Guanghui Feng > Acked-by: Shiqiang Zhang > Acked-by: Simon Guo > --- > drivers/iommu/iommu.c | 50 ++++++++++++++++++++++++++++++++++++++----- > include/linux/iommu.h | 9 ++++++++ > 2 files changed, 54 insertions(+), 5 deletions(-) Reviewed-by: Lu Baolu