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 X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 87AA5C43603 for ; Tue, 10 Dec 2019 05:32:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 432F22073D for ; Tue, 10 Dec 2019 05:32:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ozlabs-ru.20150623.gappssmtp.com header.i=@ozlabs-ru.20150623.gappssmtp.com header.b="U/nyOafu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726822AbfLJFcT (ORCPT ); Tue, 10 Dec 2019 00:32:19 -0500 Received: from mail-pf1-f195.google.com ([209.85.210.195]:37131 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725857AbfLJFcS (ORCPT ); Tue, 10 Dec 2019 00:32:18 -0500 Received: by mail-pf1-f195.google.com with SMTP id s18so8457695pfm.4 for ; Mon, 09 Dec 2019 21:32:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ozlabs-ru.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:autocrypt:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=khs0JYT3icTEz87CRGHfNZ1NvuYiS5x92cbG2QDN5k4=; b=U/nyOafuFU3z3HLexVjZ1c91yWuKr0q53l++k+67EOCYa2MTOmWBHej5KiQ/hzBwdF y1JPzq4m0bPrnFzoWQFE+xJBnv5KD4uvOhTO31fP9Jy+N1YNVjMEbYLfQUIy51mU/uCn IMZTPG3FlnWDZXkBZJDEu3hRXhC0/cPEj2A1uNcFcAHlc3Op5cmJbTwqucMRgowMEJAY FlPsqpZR9KjnmEVaQRO0Hl3rdsel5QQJ7HSu3J0+LNSKSVS7wazBA9zfDKldEwbusL5t VMyf1b8dRbTfAMexiofBuxiFfIwmqb6WfE47z5X73q4898/J25wGe+g9fuFx6dDwUmHs Tg4g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=khs0JYT3icTEz87CRGHfNZ1NvuYiS5x92cbG2QDN5k4=; b=I0UZdoUX+hGuna2Yv8b+CSrwHgDdSoTHbDAxkblpJ0j4pc2DIFh8brsUh11TjH49UJ 89R5OajWlFmv8qIPhsBlsZfvD0H08tB5p7E70UbCTLmr/z4mhh3z9qqfo6C3gIXsN4Yl pIcIojG8UN+u7v1AdO4C5N7u+18MEaOC2L9pUZv0PGYlQ91b+yuKv7TMxxHNc3Ho4Fkh jj6YJ3nMvN5plStHs4a90J+Nfs1dqtdLA1je2AmgEMJAurIwZL+VdLDvvDrx5CrwBEkD yoPY2iB0ctX22dHfpuGYZ9CmwIBQt7Hge8kOpi+3yaLVz3QyvjF6wPsN8NqsaF94rWdL xwaQ== X-Gm-Message-State: APjAAAWz7+s+Z7oACULDg677dgIAT0N2254srIMQU6n6H/oeUKsTE2QL YK2rJL83FDkfI+58TprVPrHyPw== X-Google-Smtp-Source: APXvYqx1GRRCgN7b/PwRX2eqdgZWbxrTDKxcwU8oUZxrbvuRp5tIImLtoSp2V9LQjcNFS74EJw/FYQ== X-Received: by 2002:a62:4ec7:: with SMTP id c190mr31934546pfb.68.1575955937718; Mon, 09 Dec 2019 21:32:17 -0800 (PST) Received: from [10.61.2.175] ([122.99.82.10]) by smtp.gmail.com with ESMTPSA id 67sm1365460pfw.82.2019.12.09.21.32.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 09 Dec 2019 21:32:17 -0800 (PST) Subject: Re: [PATCH v5 1/2] powerpc/pseries/iommu: Share the per-cpu TCE page with the hypervisor. To: Ram Pai Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, benh@kernel.crashing.org, david@gibson.dropbear.id.au, paulus@ozlabs.org, mdroth@linux.vnet.ibm.com, hch@lst.de, andmike@us.ibm.com, sukadev@linux.vnet.ibm.com, mst@redhat.com, ram.n.pai@gmail.com, cai@lca.pw, tglx@linutronix.de, bauerman@linux.ibm.com, linux-kernel@vger.kernel.org, leonardo@linux.ibm.com References: <1575681159-30356-1-git-send-email-linuxram@us.ibm.com> <1575681159-30356-2-git-send-email-linuxram@us.ibm.com> <20191210051244.GB5702@oc0525413822.ibm.com> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 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DG9EMkK8IBXnLulqVk54kf7fE0jT/d8RTtJIA92GzsgdK2rpT1MBKKVffjRFGwN7nQVOzi4T XrB5p+6ML7Bd84xOEGsj/vdaXmz1esuH7BOZAGEZfLRCHJ0GVCSssg== Message-ID: Date: Tue, 10 Dec 2019 16:32:10 +1100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: <20191210051244.GB5702@oc0525413822.ibm.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 10/12/2019 16:12, Ram Pai wrote: > On Tue, Dec 10, 2019 at 02:07:36PM +1100, Alexey Kardashevskiy wrote: >> >> >> On 07/12/2019 12:12, Ram Pai wrote: >>> H_PUT_TCE_INDIRECT hcall uses a page filled with TCE entries, as one of >>> its parameters. On secure VMs, hypervisor cannot access the contents of >>> this page since it gets encrypted. Hence share the page with the >>> hypervisor, and unshare when done. >> >> >> I thought the idea was to use H_PUT_TCE and avoid sharing any extra >> pages. There is small problem that when DDW is enabled, >> FW_FEATURE_MULTITCE is ignored (easy to fix); I also noticed complains >> about the performance on slack but this is caused by initial cleanup of >> the default TCE window (which we do not use anyway) and to battle this >> we can simply reduce its size by adding > > something that takes hardly any time with H_PUT_TCE_INDIRECT, takes > 13secs per device for H_PUT_TCE approach, during boot. This is with a > 30GB guest. With larger guest, the time will further detoriate. No it will not, I checked. The time is the same for 2GB and 32GB guests- the delay is caused by clearing the small DMA window which is small by the space mapped (1GB) but quite huge in TCEs as it uses 4K pages; and for DDW window + emulated devices the IOMMU page size will be 2M/16M/1G (depends on the system) so the number of TCEs is much smaller. > >> >> -global >> spapr-pci-host-bridge.dma_win_size=0x4000000 > > This option, speeds it up tremendously. But than should this option be > enabled in qemu by default? only for secure VMs? for both VMs? As discussed in slack, by default we do not need to clear the entire TCE table and we only have to map swiotlb buffer using the small window. It is a guest kernel change only. Thanks, -- Alexey 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 X-Spam-Level: X-Spam-Status: No, score=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E83D1C43603 for ; Tue, 10 Dec 2019 05:34:16 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2CBB72077B for ; Tue, 10 Dec 2019 05:34:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=ozlabs-ru.20150623.gappssmtp.com header.i=@ozlabs-ru.20150623.gappssmtp.com header.b="U/nyOafu" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2CBB72077B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ozlabs.ru Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 47X7z94hrNzDqW9 for ; Tue, 10 Dec 2019 16:34:13 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.ru (client-ip=2607:f8b0:4864:20::541; helo=mail-pg1-x541.google.com; envelope-from=aik@ozlabs.ru; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ozlabs.ru Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ozlabs-ru.20150623.gappssmtp.com header.i=@ozlabs-ru.20150623.gappssmtp.com header.b="U/nyOafu"; dkim-atps=neutral Received: from mail-pg1-x541.google.com (mail-pg1-x541.google.com [IPv6:2607:f8b0:4864:20::541]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 47X7x11drpzDqVV for ; Tue, 10 Dec 2019 16:32:20 +1100 (AEDT) Received: by mail-pg1-x541.google.com with SMTP id 6so8324119pgk.0 for ; Mon, 09 Dec 2019 21:32:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ozlabs-ru.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:autocrypt:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=khs0JYT3icTEz87CRGHfNZ1NvuYiS5x92cbG2QDN5k4=; b=U/nyOafuFU3z3HLexVjZ1c91yWuKr0q53l++k+67EOCYa2MTOmWBHej5KiQ/hzBwdF y1JPzq4m0bPrnFzoWQFE+xJBnv5KD4uvOhTO31fP9Jy+N1YNVjMEbYLfQUIy51mU/uCn IMZTPG3FlnWDZXkBZJDEu3hRXhC0/cPEj2A1uNcFcAHlc3Op5cmJbTwqucMRgowMEJAY FlPsqpZR9KjnmEVaQRO0Hl3rdsel5QQJ7HSu3J0+LNSKSVS7wazBA9zfDKldEwbusL5t VMyf1b8dRbTfAMexiofBuxiFfIwmqb6WfE47z5X73q4898/J25wGe+g9fuFx6dDwUmHs Tg4g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=khs0JYT3icTEz87CRGHfNZ1NvuYiS5x92cbG2QDN5k4=; b=JVQO0chFvMwgNHxllt6Zkzp2WOgYA1xa88jDT0cvMZpNztBmLXiHxEBYeIbJiXwJTf vgfkVf5rFTOH6yr6nz7ha5UqkLpXABb4h1xEK7ZWCa5fxyJUDoimbd/jIsmfXDLeWesG uBXnPk5OiQtLXlxsZgLzUH4/Q/BrKEYORoSeFFUCVp4Lr644rvAkwMFqlKgsypRPsrZK xKqcqZDu1xp7V3sUdHcHUFgJLT0W6/ph93ITFoZsp6DTgEt0zm6K5gp+/E8LkYHMW42H Vbwk4AI6H1XfmZG179On9NRiKNZ5iAtMeCWdNdohxrW7iLO/TiwguOSqYCywwuaie7Y4 uHwA== X-Gm-Message-State: APjAAAUoFUZvIS9CDAA5ovxGkxQ1tEZrQN6wvGg+SKguOJjIhdh1VWeN 3hS9awxvfP2YL4wqIVEIS9+dcw== X-Google-Smtp-Source: APXvYqx1GRRCgN7b/PwRX2eqdgZWbxrTDKxcwU8oUZxrbvuRp5tIImLtoSp2V9LQjcNFS74EJw/FYQ== X-Received: by 2002:a62:4ec7:: with SMTP id c190mr31934546pfb.68.1575955937718; Mon, 09 Dec 2019 21:32:17 -0800 (PST) Received: from [10.61.2.175] ([122.99.82.10]) by smtp.gmail.com with ESMTPSA id 67sm1365460pfw.82.2019.12.09.21.32.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 09 Dec 2019 21:32:17 -0800 (PST) Subject: Re: [PATCH v5 1/2] powerpc/pseries/iommu: Share the per-cpu TCE page with the hypervisor. To: Ram Pai References: <1575681159-30356-1-git-send-email-linuxram@us.ibm.com> <1575681159-30356-2-git-send-email-linuxram@us.ibm.com> <20191210051244.GB5702@oc0525413822.ibm.com> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 t847eFaVKI/6WcxhszI0R6Cj+N4y+1rHfkGWYWupCiHwj9DjILW9iEAncVgQmkNPpUsZECLT WQzMuVSxjuXW4nJ6f4OFHqL2dU//qR+BM/eJ0TT3OnfLcPqfucGxubhT7n/CXUxEy+mvWwnm s9p4uqVpTfEuzQ0/bE6t7dZdPBua7eYox1AQnk8JQDwC3Rn9kZq2O7u5KuJP5MfludMmQevm pHYEMF4vZuIpWcOrrSctJfIIEyhDoDmR34bCXAZfNJ4p4H6TPqPh671uMQV82CfTxTrMhGFq 8WYU2AH86FrVQfWoH09z1WqhlOm/KZhAV5FndwVjQJs1MRXD8QARAQABtCRBbGV4ZXkgS2Fy 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Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: andmike@us.ibm.com, mst@redhat.com, mdroth@linux.vnet.ibm.com, leonardo@linux.ibm.com, linux-kernel@vger.kernel.org, ram.n.pai@gmail.com, cai@lca.pw, tglx@linutronix.de, sukadev@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org, hch@lst.de, bauerman@linux.ibm.com, david@gibson.dropbear.id.au Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 10/12/2019 16:12, Ram Pai wrote: > On Tue, Dec 10, 2019 at 02:07:36PM +1100, Alexey Kardashevskiy wrote: >> >> >> On 07/12/2019 12:12, Ram Pai wrote: >>> H_PUT_TCE_INDIRECT hcall uses a page filled with TCE entries, as one of >>> its parameters. On secure VMs, hypervisor cannot access the contents of >>> this page since it gets encrypted. Hence share the page with the >>> hypervisor, and unshare when done. >> >> >> I thought the idea was to use H_PUT_TCE and avoid sharing any extra >> pages. There is small problem that when DDW is enabled, >> FW_FEATURE_MULTITCE is ignored (easy to fix); I also noticed complains >> about the performance on slack but this is caused by initial cleanup of >> the default TCE window (which we do not use anyway) and to battle this >> we can simply reduce its size by adding > > something that takes hardly any time with H_PUT_TCE_INDIRECT, takes > 13secs per device for H_PUT_TCE approach, during boot. This is with a > 30GB guest. With larger guest, the time will further detoriate. No it will not, I checked. The time is the same for 2GB and 32GB guests- the delay is caused by clearing the small DMA window which is small by the space mapped (1GB) but quite huge in TCEs as it uses 4K pages; and for DDW window + emulated devices the IOMMU page size will be 2M/16M/1G (depends on the system) so the number of TCEs is much smaller. > >> >> -global >> spapr-pci-host-bridge.dma_win_size=0x4000000 > > This option, speeds it up tremendously. But than should this option be > enabled in qemu by default? only for secure VMs? for both VMs? As discussed in slack, by default we do not need to clear the entire TCE table and we only have to map swiotlb buffer using the small window. It is a guest kernel change only. Thanks, -- Alexey