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charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: sct-15-20-4755-11-msonline-outlook-42ed3.templateTenant X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PNZPR01MB4415.INDPRD01.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: 08714fdb-5138-45ec-4fdc-08d9eb130250 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Feb 2022 14:55:12.5047 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BMXPR01MB4759 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On 08-Feb-2022, at 7:33 PM, Ard Biesheuvel wrote: >=20 > On Tue, 8 Feb 2022 at 14:55, Aditya Garg wrote: >>=20 >> On using some specific kernel configuration, on Macs with the T2 Securit= y chip, EFI Runtime services fail to start. Some logs which may be useful a= re as follows :- >>=20 >> Feb 08 17:11:11 MacBook kernel: [Firmware Bug]: Page fault caused by fir= mware at PA: 0xffffa79840068000 >> Feb 08 17:11:11 MacBook kernel: WARNING: CPU: 11 PID: 150 at arch/x86/pl= atform/efi/quirks.c:735 efi_crash_gracefully_on_page_fault+0x50/0xd0 >=20 > This means the firmware is broken. There is very little we can do > about this beyond disabling EFI runtime services entirely on such > systems. >=20 > ... >=20 >> The kernel configuration where this bug is seen is on https://github.com= /t2linux/T2-Ubuntu-Kernel/blob/Mainline/templates/default-config >>=20 >> I had an old kernel configuration, where I did not face this issue and w= as easily able to write to the NVRAM. That kernel configuration is on https= ://github.com/t2linux/T2-Ubuntu-Kernel/blob/b5c20b8c7689251dd943e22dbe02cef= 9020db8d1/templates/default-config >>=20 >> I believe these lines in the kernel config, which are present in the for= mer but absent in the latter are causing the issue :- >>=20 > ... >=20 >> Especially CONFIG_LOAD_UEFI_KEYS=3Dy is which I guess may be the culprit= . >>=20 >=20 > Yes, that seems likely. >=20 >> I request you to reply to my issue as soon as possible >>=20 >=20 > Please stop demanding attention like this, even though it is thinly > veiled as courteous. >=20 > If you want to run bleeding edge kernels on non-standard EFI hardware, > you have to be able to sort yourself out to some extent. I am the > EFI-on-Linux maintainer, but that doesn't mean I work for you and have > to be on call to fix your problems. Looks like I offended you. Heartiest apologies for that. I guess being from= a non English background my works had a negative effect on you. My intenti= on was just to get help, not complain. Regards Aditya