[{"id":1768278,"web_url":"http://patchwork.ozlabs.org/comment/1768278/","msgid":"<20170914114834.62dcc428@firefly.ozlabs.ibm.com>","date":"2017-09-14T01:48:34","subject":"Re: [PATCH 5/7] powerpc: Swizzle around 4K PTE bits to free up bit\n\t5 and bit 6","submitter":{"id":9347,"url":"http://patchwork.ozlabs.org/api/people/9347/","name":"Balbir Singh","email":"bsingharora@gmail.com"},"content":"On Fri, 8 Sep 2017 15:44:45 -0700\nRam Pai wrote:\n\n> We need PTE bits 3 ,4, 5, 6 and 57 to support protection-keys,\n> because these are the bits we want to consolidate on across all\n> configuration to support protection keys.\n> \n> Bit 3,4,5 and 6 are currently used on 4K-pte kernels. But bit 9\n> and 10 are available. Hence we use the two available bits and\n> free up bit 5 and 6. We will still not be able to free up bit 3\n> and 4. In the absence of any other free bits, we will have to\n> stay satisfied with what we have :-(. This means we will not\n> be able to support 32 protection keys, but only 8. The bit\n> numbers are big-endian as defined in the ISA3.0\n>\n\nAny chance for 4k PTE's we can do slot searching for the PTE?\nI guess thats add additional complexity\n\nBalbir Singh.","headers":{"Return-Path":"","X-Original-To":["patchwork-incoming@ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":["patchwork-incoming@ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Received":["from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xt1gd5Gftz9t2l\n\tfor ;\n\tThu, 14 Sep 2017 11:50:05 +1000 (AEST)","from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3xt1gd2qWGzDqlR\n\tfor ;\n\tThu, 14 Sep 2017 11:50:05 +1000 (AEST)","from mail-pf0-x244.google.com (mail-pf0-x244.google.com\n\t[IPv6:2607:f8b0:400e:c00::244])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128\n\tbits)) (No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3xt1f5187SzDqJp\n\tfor ;\n\tThu, 14 Sep 2017 11:48:45 +1000 (AEST)","by mail-pf0-x244.google.com with SMTP id q76so782093pfq.5\n\tfor ;\n\tWed, 13 Sep 2017 18:48:44 -0700 (PDT)","from firefly.ozlabs.ibm.com ([122.99.82.10])\n\tby smtp.gmail.com with ESMTPSA id\n\tg66sm32618715pfj.161.2017.09.13.18.48.39\n\t(version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256);\n\tWed, 13 Sep 2017 18:48:42 -0700 (PDT)"],"Authentication-Results":["ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"S+iL11GE\"; 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x86_64-redhat-linux-gnu)","MIME-Version":"1.0","Content-Type":"text/plain; charset=US-ASCII","Content-Transfer-Encoding":"7bit","X-BeenThere":"linuxppc-dev@lists.ozlabs.org","X-Mailman-Version":"2.1.24","Precedence":"list","List-Id":"Linux on PowerPC Developers Mail List\n\t","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"ebiederm@xmission.com, mhocko@kernel.org, paulus@samba.org,\n\taneesh.kumar@linux.vnet.ibm.com, bauerman@linux.vnet.ibm.com,\n\tlinuxppc-dev@lists.ozlabs.org, khandual@linux.vnet.ibm.com","Errors-To":"linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org","Sender":"\"Linuxppc-dev\"\n\t"}},{"id":1768752,"web_url":"http://patchwork.ozlabs.org/comment/1768752/","msgid":"<20170914172306.GE5698@ram.oc3035372033.ibm.com>","date":"2017-09-14T17:23:06","subject":"Re: [PATCH 5/7] powerpc: Swizzle around 4K PTE bits to free up bit 5\n\tand bit 6","submitter":{"id":2667,"url":"http://patchwork.ozlabs.org/api/people/2667/","name":"Ram Pai","email":"linuxram@us.ibm.com"},"content":"On Thu, Sep 14, 2017 at 11:48:34AM +1000, Balbir Singh wrote:\n> On Fri, 8 Sep 2017 15:44:45 -0700\n> Ram Pai wrote:\n> \n> > We need PTE bits 3 ,4, 5, 6 and 57 to support protection-keys,\n> > because these are the bits we want to consolidate on across all\n> > configuration to support protection keys.\n> > \n> > Bit 3,4,5 and 6 are currently used on 4K-pte kernels. But bit 9\n> > and 10 are available. Hence we use the two available bits and\n> > free up bit 5 and 6. We will still not be able to free up bit 3\n> > and 4. In the absence of any other free bits, we will have to\n> > stay satisfied with what we have :-(. This means we will not\n> > be able to support 32 protection keys, but only 8. The bit\n> > numbers are big-endian as defined in the ISA3.0\n> >\n> \n> Any chance for 4k PTE's we can do slot searching for the PTE?\n> I guess thats add additional complexity\n\nAneesh, i think, is working on moving slot information out of the PTE.\nIf that happens, we will have leg-space to support more keys.\n\nRP","headers":{"Return-Path":"","X-Original-To":["patchwork-incoming@ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":["patchwork-incoming@ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Received":["from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xtQPw6Bh6z9sRg\n\tfor ;\n\tFri, 15 Sep 2017 03:24:36 +1000 (AEST)","from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3xtQPw5BwyzDrXh\n\tfor ;\n\tFri, 15 Sep 2017 03:24:36 +1000 (AEST)","from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com\n\t[148.163.158.5])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3xtQNQ0WHFzDqG3\n\tfor ;\n\tFri, 15 Sep 2017 03:23:17 +1000 (AEST)","from pps.filterd (m0098419.ppops.net [127.0.0.1])\n\tby mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id\n\tv8EHJJD2053192\n\tfor ; Thu, 14 Sep 2017 13:23:15 -0400","from e11.ny.us.ibm.com (e11.ny.us.ibm.com [129.33.205.201])\n\tby mx0b-001b2d01.pphosted.com with ESMTP id 2cywb82tnn-1\n\t(version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT)\n\tfor ; Thu, 14 Sep 2017 13:23:15 -0400","from localhost\n\tby e11.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use\n\tOnly! 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Violators will be prosecuted; \n\tThu, 14 Sep 2017 13:23:10 -0400","from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com\n\t[9.57.199.109])\n\tby b01cxnp23034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP\n\tid v8EHNA2640435728; Thu, 14 Sep 2017 17:23:10 GMT","from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1])\n\tby IMSVA (Postfix) with ESMTP id 3B6C9112034;\n\tThu, 14 Sep 2017 13:22:52 -0400 (EDT)","from ram.oc3035372033.ibm.com (unknown [9.85.179.168])\n\tby b01ledav004.gho.pok.ibm.com (Postfix) with ESMTPS id 1F7E7112047; \n\tThu, 14 Sep 2017 13:22:51 -0400 (EDT)"],"Authentication-Results":"ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=us.ibm.com\n\t(client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com;\n\tenvelope-from=linuxram@us.ibm.com; receiver=)","Date":"Thu, 14 Sep 2017 10:23:06 -0700","From":"Ram Pai ","To":"Balbir Singh ","Subject":"Re: [PATCH 5/7] powerpc: Swizzle around 4K PTE bits to free up bit 5\n\tand bit 6","References":"<1504910713-7094-1-git-send-email-linuxram@us.ibm.com>\n\t<1504910713-7094-6-git-send-email-linuxram@us.ibm.com>\n\t<20170914114834.62dcc428@firefly.ozlabs.ibm.com>","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20170914114834.62dcc428@firefly.ozlabs.ibm.com>","User-Agent":"Mutt/1.5.20 (2009-12-10)","X-TM-AS-GCONF":"00","x-cbid":"17091417-2213-0000-0000-0000021B197F","X-IBM-SpamModules-Scores":"","X-IBM-SpamModules-Versions":"BY=3.00007733; HX=3.00000241; KW=3.00000007;\n\tPH=3.00000004; SC=3.00000227; SDB=6.00916991; UDB=6.00460532;\n\tIPR=6.00697218; \n\tBA=6.00005589; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009;\n\tZB=6.00000000; \n\tZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00017154;\n\tXFM=3.00000015; UTC=2017-09-14 17:23:13","X-IBM-AV-DETECTION":"SAVI=unused REMOTE=unused XFE=unused","x-cbparentid":"17091417-2214-0000-0000-0000578BD882","Message-Id":"<20170914172306.GE5698@ram.oc3035372033.ibm.com>","X-Proofpoint-Virus-Version":"vendor=fsecure engine=2.50.10432:, ,\n\tdefinitions=2017-09-14_05:, , signatures=0","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n\tspamscore=0 suspectscore=2\n\tmalwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam\n\tadjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000\n\tdefinitions=main-1709140261","X-BeenThere":"linuxppc-dev@lists.ozlabs.org","X-Mailman-Version":"2.1.24","Precedence":"list","List-Id":"Linux on PowerPC Developers Mail List\n\t","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Reply-To":"Ram Pai ","Cc":"ebiederm@xmission.com, mhocko@kernel.org, paulus@samba.org,\n\taneesh.kumar@linux.vnet.ibm.com, bauerman@linux.vnet.ibm.com,\n\tlinuxppc-dev@lists.ozlabs.org, khandual@linux.vnet.ibm.com","Errors-To":"linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org","Sender":"\"Linuxppc-dev\"\n\t"}}]