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Tue, 8 Jun 2021 17:53:15 +0000 From: Michael Kelley To: James Morris , Sasha Levin , Linus Torvalds , Mike Rapoport , Borislav Petkov CC: x86-ml , lkml , James Morris Subject: RE: [GIT PULL] x86/urgent for v5.13-rc5 Thread-Topic: [GIT PULL] x86/urgent for v5.13-rc5 Thread-Index: AQHXWqlnAKc2uywMC0GvJuk61QX3pKsHYb0AgAAWV4CAAAbygIAADHgAgAAQEYCAAUoDAIABgUXA Date: Tue, 8 Jun 2021 17:53:15 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_ActionId=c9e8de73-bd8e-4ad4-9f35-f6a9f1a5f42a;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_ContentBits=0;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Enabled=true;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Method=Standard;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Name=Internal;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SetDate=2021-06-08T17:45:34Z;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SiteId=72f988bf-86f1-41af-91ab-2d7cd011db47; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MWHPR21MB1593.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: beebfe4f-e212-40cd-1d25-08d92aa64aa4 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Jun 2021 17:53:15.3193 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: eS5luHJu2WtcoVFuDs8eV69r/Mwn5zwQLll1/lFbEP0JUHF1O2Jc5f76U9O6aZqwbwLXw3ZTwqqJ23fu8UwodKJgSFqrP5k+1jNkXCsozZc= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR21MB0782 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: James Morris Sent: Monday, June 7, 2021 11:47 AM >=20 > On Sun, 6 Jun 2021, Sasha Levin wrote: >=20 > > > > > >Let's see if Sasha can dig out something... CCed. > > > > > >@Sasha, can you figure out who we can talk to whether Windoze reserves > > >the first megabyte of memory unconditionally? > > > > That's a great question, but I can't help there anymore :) > > > > Adding James Morris... >=20 > Adding Michael Kelley. >=20 I checked with the Windows team. Peter Anvin's statement from 11 years ago is true. On Intel and AMD processors, Windows unconditionally reserves the 1st megabyte of memory, minus one page used for real mode startup. This is done to work around BIOS bugs. Michael