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--_000_5eabf2c9104644ba955a4c3a4de983dczhaoxincom_-- From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mx.groups.io; dkim=missing; spf=pass (domain: redhat.com, ip: 209.132.183.28, mailfrom: lersek@redhat.com) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by groups.io with SMTP; Tue, 17 Sep 2019 05:06:50 -0700 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 946E6C057F23; Tue, 17 Sep 2019 12:06:49 +0000 (UTC) Received: from lacos-laptop-7.usersys.redhat.com (ovpn-120-37.rdu2.redhat.com [10.10.120.37]) by smtp.corp.redhat.com (Postfix) with ESMTP id DDF9360126; Tue, 17 Sep 2019 12:06:46 +0000 (UTC) Subject: Re: [edk2-devel] [edk2] DxeIpl : create page table, occupied too much memory range To: devel@edk2.groups.io, tigerliu@zhaoxin.com References: <5eabf2c9104644ba955a4c3a4de983dc@zhaoxin.com> From: "Laszlo Ersek" Message-ID: <2aca1445-6688-cb20-c0e3-938a4c4acd38@redhat.com> Date: Tue, 17 Sep 2019 14:06:45 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <5eabf2c9104644ba955a4c3a4de983dc@zhaoxin.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Tue, 17 Sep 2019 12:06:49 +0000 (UTC) Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit On 09/17/19 13:08, Tiger Liu(BJ-RD) wrote: > Hi, Expert: > I have a question about creating page table. > If a CPU support 48bit physical address line, then creating page tables(Page size=2MB) will occupy too much memory region. > > Now, developer could only use PcdUse1GPageTable to avoid occupy too much memory region? Not only. See . Thanks Laszlo From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mx.groups.io; dkim=missing; spf=none, err=SPF record not found (domain: zhaoxin.com, ip: 203.148.12.82, mailfrom: tigerliu@zhaoxin.com) Received: from ZXSHCAS2.zhaoxin.com (ZXSHCAS2.zhaoxin.com [203.148.12.82]) by groups.io with SMTP; Wed, 18 Sep 2019 03:50:57 -0700 Received: from zxbjmbx2.zhaoxin.com (10.29.252.164) by ZXSHCAS2.zhaoxin.com (10.28.252.162) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1261.35; Wed, 18 Sep 2019 18:50:50 +0800 Received: from zxbjmbx2.zhaoxin.com (10.29.252.164) by zxbjmbx2.zhaoxin.com (10.29.252.164) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1261.35; Wed, 18 Sep 2019 18:50:50 +0800 Received: from zxbjmbx2.zhaoxin.com ([fe80::4d77:9dba:64a8:8ec3]) by zxbjmbx2.zhaoxin.com ([fe80::4d77:9dba:64a8:8ec3%4]) with mapi id 15.01.1261.035; Wed, 18 Sep 2019 18:50:50 +0800 From: "Tiger Liu(BJ-RD)" To: Laszlo Ersek , "devel@edk2.groups.io" Subject: =?UTF-8?B?562U5aSNOiBbZWRrMi1kZXZlbF0gW2VkazJdIER4ZUlwbCA6IGNyZWF0ZSBwYWdlIHRhYmxlLCBvY2N1cGllZCB0b28gbXVjaCBtZW1vcnkgcmFuZ2U=?= Thread-Topic: [edk2-devel] [edk2] DxeIpl : create page table, occupied too much memory range Thread-Index: AdVtRlaRdipj3s7PQRucZxuSwomlD///jfaA//3+z3A= Date: Wed, 18 Sep 2019 10:50:50 +0000 Message-ID: References: <5eabf2c9104644ba955a4c3a4de983dc@zhaoxin.com> <2aca1445-6688-cb20-c0e3-938a4c4acd38@redhat.com> In-Reply-To: <2aca1445-6688-cb20-c0e3-938a4c4acd38@redhat.com> Accept-Language: zh-CN, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.28.28.20] MIME-Version: 1.0 Return-Path: TigerLiu@zhaoxin.com Content-Language: zh-CN Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 SGksIExhc3psbzoNClRoYW5rcyBmb3IgeW91ciByZXBseSENCg0KSXMgVXNpbmcgUGNkVXNlNUxl dmVsUGFnZVRhYmxlIGFsc28gYSBtZXRob2QgdG8gcmVkdWNlIHBhZ2luZyB0YWJsZSdzIG1lbW9y eSByZXF1aXJlbWVudD8NCg0KSSBmaW5kIFBjZFVzZTFHUGFnZVRhYmxlJ3MgZGVmYXVsdCB2YWx1 ZSBpcyBmYWxzZSwgd2h5Pw0KDQpQY2RVc2U1TGV2ZWxQYWdlVGFibGUncyBkZWZhdWx0IHZhbHVl IGlzIHRydWUsIGFuZCBEeGVJcGwgbW9kdWxlIHdpbGwgY3JlYXRlIDUtbGV2ZWwgcGFnaW5nIGZv ciBEeGUncyBsb25nIG1vZGU/DQoNCkJlc3Qgd2lzaGVzLA0KDQotLS0tLdPKvP7Urbz+LS0tLS0N CreivP7IyzogTGFzemxvIEVyc2VrIDxsZXJzZWtAcmVkaGF0LmNvbT4NCreiy83KsbzkOiAyMDE5 xOo51MIxN8jVIDIwOjA3DQrK1bz+yMs6IGRldmVsQGVkazIuZ3JvdXBzLmlvOyBUaWdlciBMaXUo QkotUkQpIDxUaWdlckxpdUB6aGFveGluLmNvbT4NCtb3zOI6IFJlOiBbZWRrMi1kZXZlbF0gW2Vk azJdIER4ZUlwbCA6IGNyZWF0ZSBwYWdlIHRhYmxlLCBvY2N1cGllZCB0b28gbXVjaCBtZW1vcnkg cmFuZ2UNCg0KT24gMDkvMTcvMTkgMTM6MDgsIFRpZ2VyIExpdShCSi1SRCkgd3JvdGU6DQo+IEhp LCBFeHBlcnQ6DQo+IEkgaGF2ZSBhIHF1ZXN0aW9uIGFib3V0IGNyZWF0aW5nIHBhZ2UgdGFibGUu DQo+IElmIGEgQ1BVIHN1cHBvcnQgNDhiaXQgcGh5c2ljYWwgYWRkcmVzcyBsaW5lLCB0aGVuIGNy ZWF0aW5nIHBhZ2UgdGFibGVzKFBhZ2Ugc2l6ZT0yTUIpIHdpbGwgb2NjdXB5IHRvbyBtdWNoIG1l bW9yeSByZWdpb24uDQo+DQo+IE5vdywgZGV2ZWxvcGVyIGNvdWxkIG9ubHkgdXNlIFBjZFVzZTFH UGFnZVRhYmxlIHRvIGF2b2lkIG9jY3VweSB0b28gbXVjaCBtZW1vcnkgcmVnaW9uPw0KDQpOb3Qg b25seS4gU2VlIDxodHRwczovL2J1Z3ppbGxhLnRpYW5vY29yZS5vcmcvc2hvd19idWcuY2dpP2lk PTIwMDg+Lg0KDQpUaGFua3MNCkxhc3psbw0KDQoNCrGjw9zJ+cP3o7oNCrG+08q8/rqs09Cxo8Pc u/LXqNPQ0MXPoqOsvfa5qda4tqjK1bz+yMvKudPDoaPRz737ttSxvtPKvP678sbkxNrI3df2yM66 zs60vq3K2siotcSy6dTEoaLKudPDoaK4tNbGu/LXqreioaMNCkNPTkZJREVOVElBTCBOT1RFOg0K VGhpcyBlbWFpbCBjb250YWlucyBjb25maWRlbnRpYWwgb3IgbGVnYWxseSBwcml2aWxlZ2VkIGlu Zm9ybWF0aW9uIGFuZCBpcyBmb3IgdGhlIHNvbGUgdXNlIG9mIGl0cyBpbnRlbmRlZCByZWNpcGll bnQuIEFueSB1bmF1dGhvcml6ZWQgcmV2aWV3LCB1c2UsIGNvcHlpbmcgb3IgZm9yd2FyZGluZyBv ZiB0aGlzIGVtYWlsIG9yIHRoZSBjb250ZW50IG9mIHRoaXMgZW1haWwgaXMgc3RyaWN0bHkgcHJv aGliaXRlZC4NCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mx.groups.io; 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Wed, 18 Sep 2019 10:10:38 -0700 (PDT) Sender: afish@apple.com MIME-version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Subject: Re: [edk2-devel] [edk2] DxeIpl : create page table, occupied too much memory range From: "Andrew Fish" In-reply-to: Date: Wed, 18 Sep 2019 10:10:36 -0700 Cc: Laszlo Ersek Message-id: <8424C048-188F-4D69-B94B-33A135381628@apple.com> References: <5eabf2c9104644ba955a4c3a4de983dc@zhaoxin.com> <2aca1445-6688-cb20-c0e3-938a4c4acd38@redhat.com> To: devel@edk2.groups.io, tigerliu@zhaoxin.com X-Mailer: Apple Mail (2.3445.104.11) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-09-18_09:,, signatures=0 Content-type: text/plain; charset=utf-8 Content-transfer-encoding: quoted-printable > On Sep 18, 2019, at 3:50 AM, Tiger Liu(BJ-RD) wro= te: >=20 > Hi, Laszlo: > Thanks for your reply! >=20 > Is Using PcdUse5LevelPageTable also a method to reduce paging table's me= mory requirement? >=20 Tiger, No the 5-level page tables [1] are about increasing the size of the virtua= l addresses from 48 bits (256 terabytes) to 57 bits (128 petabytes). On x86= there are noncanonical addresses [2] in the middle of the virtual memory s= pace that will cause a GP fault if they are used since they can not be mapp= ed by page tables. The 5-level page table decreases the amount of noncanon= ical addressess in the virtual memory map, since the 5th level allows you t= o map more virtual addresses. I think from an EFI perspective you likely on= ly add a single page table entry unless your CPU supports more than 256 ter= abytes of physical address space.=20 > I find PcdUse1GPageTable's default value is false, why? The people who work for CPU companies will know more than me, but I seem t= o remember that 1GB page tables are common on modern server CPUs, but not o= n client CPUs. So I guess the PCD is just to remove a check that is likely = to fail [3]. If your system supports 1GB pages you can set PcdUse1GPageTabl= e to TRUE in your platforms DSC file.=20 Given EFI is identity mapped (Virtual address =3D=3D Physical address) and= Long Mode requires that paging is enabled you need page tables for any phy= sical address that is decoded by your chipset or memory controller (memory = or memory mapped IO).=20 If you look at this code [4] you will see you can configure how much of th= e address space requires page tables via the EFI_HOB_TYPE_CPU, if that HOB = is not present a CPU ID instruction is used to ask the processor how much p= hysical addressing it supports, and if that CPU ID feature is not present y= ou get the old answer of 36-bits.=20 So if you are trying to minimized page table generation you need to set EF= I_HOB_TYPE_CPU.SizeOfMemorySpace to a value that matches the highest memory= or memory mapped IO physical addresses you platform supports. Basically it= does not matter how much physical addressing your CPU supports if nothing = in your system is decoded by some of the upper address bits. PcdUse1GPageTa= ble is only going to help you if your CPU supports it.=20 >=20 > PcdUse5LevelPageTable's default value is true, and DxeIpl module will cr= eate 5-level paging for Dxe's long mode? >=20 As I mentioned you only need the 5 level page tables if your system has me= mory or memory mapped IO at an address greater than 256 terabytes (48-bits)= . [1] https://en.wikipedia.org/wiki/Intel_5-level_paging [2] https://en.wikipedia.org/wiki/X86-64 [3] https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Core/DxeIpl= Peim/X64/VirtualMemory.c#L667 [4] https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Core/DxeIpl= Peim/X64/VirtualMemory.c#L679 Thanks, Andrew Fish > Best wishes, >=20 > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6----- > =E5=8F=91=E4=BB=B6=E4=BA=BA: Laszlo Ersek > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B49=E6=9C=8817=E6=97=A5= 20:07 > =E6=94=B6=E4=BB=B6=E4=BA=BA: devel@edk2.groups.io; Tiger Liu(BJ-RD) > =E4=B8=BB=E9=A2=98: Re: [edk2-devel] [edk2] DxeIpl : create page table, = occupied too much memory range >=20 > On 09/17/19 13:08, Tiger Liu(BJ-RD) wrote: >> Hi, Expert: >> I have a question about creating page table. >> If a CPU support 48bit physical address line, then creating page tables= (Page size=3D2MB) will occupy too much memory region. >>=20 >> Now, developer could only use PcdUse1GPageTable to avoid occupy too muc= h memory region? >=20 > Not only. See . >=20 > Thanks > Laszlo >=20 >=20 > =E4=BF=9D=E5=AF=86=E5=A3=B0=E6=98=8E=EF=BC=9A > =E6=9C=AC=E9=82=AE=E4=BB=B6=E5=90=AB=E6=9C=89=E4=BF=9D=E5=AF=86=E6=88=96= = =E4=B8=93=E6=9C=89=E4=BF=A1=E6=81=AF=EF=BC=8C=E4=BB=85=E4=BE=9B=E6=8C=87= =E5=AE=9A=E6=94=B6=E4=BB=B6=E4=BA=BA=E4=BD=BF=E7=94=A8=E3=80=82=E4=B8=A5= =E7=A6=81=E5=AF=B9=E6=9C=AC=E9=82=AE=E4=BB=B6=E6=88=96=E5=85=B6=E5=86=85= =E5=AE=B9=E5=81=9A=E4=BB=BB=E4=BD=95=E6=9C=AA=E7=BB=8F=E6=8E=88=E6=9D=83= =E7=9A=84=E6=9F=A5=E9=98=85=E3=80=81=E4=BD=BF=E7=94=A8=E3=80=81=E5=A4=8D= =E5=88=B6=E6=88=96=E8=BD=AC=E5=8F=91=E3=80=82 > CONFIDENTIAL NOTE: > This email contains confidential or legally privileged information and i= s for the sole use of its intended recipient. Any unauthorized review, use,= copying or forwarding of this email or the content of this email is strict= ly prohibited. >=20 >=20 >=20 From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mx.groups.io; dkim=missing; spf=none, err=SPF record not found (domain: zhaoxin.com, ip: 203.148.12.82, mailfrom: tigerliu@zhaoxin.com) Received: from ZXSHCAS2.zhaoxin.com (ZXSHCAS2.zhaoxin.com [203.148.12.82]) by groups.io with SMTP; Thu, 19 Sep 2019 00:43:43 -0700 Received: from zxbjmbx2.zhaoxin.com (10.29.252.164) by ZXSHCAS2.zhaoxin.com (10.28.252.162) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1261.35; Thu, 19 Sep 2019 15:43:37 +0800 Received: from zxbjmbx2.zhaoxin.com (10.29.252.164) by zxbjmbx2.zhaoxin.com (10.29.252.164) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1261.35; Thu, 19 Sep 2019 15:43:37 +0800 Received: from zxbjmbx2.zhaoxin.com ([fe80::4d77:9dba:64a8:8ec3]) by zxbjmbx2.zhaoxin.com ([fe80::4d77:9dba:64a8:8ec3%4]) with mapi id 15.01.1261.035; Thu, 19 Sep 2019 15:43:37 +0800 From: "Tiger Liu(BJ-RD)" To: "devel@edk2.groups.io" , "afish@apple.com" CC: Laszlo Ersek Subject: =?UTF-8?B?562U5aSNOiBbZWRrMi1kZXZlbF0gW2VkazJdIER4ZUlwbCA6IGNyZWF0ZSBwYWdlIHRhYmxlLCBvY2N1cGllZCB0b28gbXVjaCBtZW1vcnkgcmFuZ2U=?= Thread-Topic: [edk2-devel] [edk2] DxeIpl : create page table, occupied too much memory range Thread-Index: AdVtRlaRdipj3s7PQRucZxuSwomlD///jfaA//3+z3CAA+hrAP/+hg5A Date: Thu, 19 Sep 2019 07:43:37 +0000 Message-ID: <109380fe85654ca899041fb2c15caaa2@zhaoxin.com> References: <5eabf2c9104644ba955a4c3a4de983dc@zhaoxin.com> <2aca1445-6688-cb20-c0e3-938a4c4acd38@redhat.com> <8424C048-188F-4D69-B94B-33A135381628@apple.com> In-Reply-To: <8424C048-188F-4D69-B94B-33A135381628@apple.com> Accept-Language: zh-CN, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.28.28.20] MIME-Version: 1.0 Return-Path: TigerLiu@zhaoxin.com Content-Language: zh-CN 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