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[124.171.83.152]) by smtp.gmail.com with ESMTPSA id nl5sm883905pjb.36.2020.06.22.20.52.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 22 Jun 2020 20:52:11 -0700 (PDT) Subject: Re: [PATCH 4/4] powerpc/pseries/iommu: Remove default DMA window before creating DDW To: Leonardo Bras , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Thiago Jung Bauermann , Ram Pai Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org References: <20200619050619.266888-1-leobras.c@gmail.com> <20200619050619.266888-5-leobras.c@gmail.com> <4bf1d32da3d13a44e3c2e4b04f369fe52c24a023.camel@gmail.com> <205edd45b7bbf39d2fc1d2d75fd7e35336f109ac.camel@gmail.com> <03e82e1a1bcf516d01ca472546d8b31e468aba8b.camel@gmail.com> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV 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Zd44XWqUu7FzVOYaSgIvTP0hNrBYm/E6M7yrLbs3JY74fGzPWGRbBUHTZXQEqQnZglXaVB5V ZhSFtHopZnBSCUSNDbB+QGy4B/E++Bb02IBTGl/JxmOwG+kZUnymsPvTtnNIeTLHxN/H/ae0 c7E5M+/NpslPCmYnDjs5qg0/3ihh6XuOGggZQOqrYPC3PnsNs3NxirwOkVPQgO6mXxpuifvJ DG9EMkK8IBXnLulqVk54kf7fE0jT/d8RTtJIA92GzsgdK2rpT1MBKKVffjRFGwN7nQVOzi4T XrB5p+6ML7Bd84xOEGsj/vdaXmz1esuH7BOZAGEZfLRCHJ0GVCSssg== Message-ID: <39d4e1aa-d758-2199-cb2c-fb60e252e904@ozlabs.ru> Date: Tue, 23 Jun 2020 13:52:06 +1000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <03e82e1a1bcf516d01ca472546d8b31e468aba8b.camel@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 23/06/2020 12:43, Leonardo Bras wrote: > On Tue, 2020-06-23 at 12:35 +1000, Alexey Kardashevskiy wrote: >>> I am not sure if this is true in general, but in this device (SR-IOV >>> VF) I am testing it will return 0 windows if the default DMA window is >>> not deleted, and 1 after it's deleted. >> >> Since pHyp can only create windows in "64bit space", now (I did not know >> until a few month back) I expect that thing to return "1" always no >> matter what happened to the default window. And removing the default >> window will only affect the maximum number of TCEs but not the number of >> possible windows. > > Humm, something gone wrong then. > > This patchset was developed mostly because on testing, DDW would never > be created because windows_available would always be 0. ? On phyp, if there is a huge window, then it can be 0 or 1. On KVM, it is 0 or 1 or 2. > > I will take a deeper look in that. > > Best regards, > Leonardo > -- Alexey