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bh=VEuUjjQlFS0MFGxgzWVqz9t12MNDkBJC5FbPh6BNEJo=; b=ZpkzbBUHkdXKgR4zZDXFU97VlbNetkBMPc2wgw5uP5CqD+shvGkGhjIqS8bGbTZx3FjMKj c8Z+5QIZZY3MF3T23jx4SPIfH42CevVXxqbCx2/uBL/bf6caAyHzcHk9RhoVH/gyEruN+G YjAiaHSgSkFhOyw6GBwVoL31hXOcM9c= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-289-Z7LamPxiPQON4KyxBudn7A-1; Thu, 04 Jun 2020 11:27:52 -0400 X-MC-Unique: Z7LamPxiPQON4KyxBudn7A-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7F69C1B18BC5; Thu, 4 Jun 2020 15:27:48 +0000 (UTC) Received: from [10.36.112.96] (ovpn-112-96.ams2.redhat.com [10.36.112.96]) by smtp.corp.redhat.com (Postfix) with ESMTP id 29C4960C80; Thu, 4 Jun 2020 15:27:46 +0000 (UTC) Subject: Re: [PATCH] iommu/mediatek: Use totalram_pages to setup enable_4GB To: Christoph Hellwig References: <20200604080120.2628-1-miles.chen@mediatek.com> <55820901-430b-14c4-9426-7a4991ca0eed@redhat.com> <1591264174.12661.17.camel@mtkswgap22> <20200604150643.GA29193@infradead.org> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200604150643.GA29193@infradead.org> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Cc: wsd_upstream@mediatek.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Chao Hao , Miles Chen , linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Matthias Brugger , yingjoe.chen@mediatek.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 04.06.20 17:06, Christoph Hellwig wrote: > On Thu, Jun 04, 2020 at 01:32:40PM +0200, David Hildenbrand wrote: >> Just a thought: If memory hotplug is applicable as well, you might >> either want to always assume data->enable_4GB, or handle memory hotplug >> events from the memory notifier, when new memory gets onlined (not sure >> how tricky that is). > > We probably want a highest_pfn_possible() or similar API instead of > having drivers poking into random VM internals. Well, memory notifiers are a reasonable api used accross the kernel to get notified when new memory is onlined to the buddy that could be used for allocations. highest_pfn_possible() would have to default to something linked to MAX_PHYSMEM_BITS whenever memory hotplug is configured, I am not sure how helpful that is (IOW, you can just default to enable_4GB=true in that case instead in most cases). -- Thanks, David / dhildenb _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu