From: "Yao, Jiewen" <jiewen.yao@intel.com>
To: Dionna Amalie Glaze <dionnaglaze@google.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Ard Biesheuvel <ardb@kernel.org>, Peter Gonda <pgonda@google.com>,
Borislav Petkov <bp@alien8.de>,
"Lutomirski, Andy" <luto@kernel.org>, "Christopherson,,
Sean" <seanjc@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Rodel, Jorg" <jroedel@suse.de>, Andi Kleen <ak@linux.intel.com>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
David Rientjes <rientjes@google.com>,
Vlastimil Babka <vbabka@suse.cz>,
Tom Lendacky <thomas.lendacky@amd.com>,
Thomas Gleixner <tglx@linutronix.de>,
"Peter Zijlstra" <peterz@infradead.org>,
Paolo Bonzini <pbonzini@redhat.com>,
"Ingo Molnar" <mingo@redhat.com>,
Varad Gautam <varad.gautam@suse.com>,
"Dario Faggioli" <dfaggioli@suse.com>,
"Hansen, Dave" <dave.hansen@intel.com>,
"Mike Rapoport" <rppt@kernel.org>,
David Hildenbrand <david@redhat.com>,
"Marcelo Cerri" <marcelo.cerri@canonical.com>,
"tim.gardner@canonical.com" <tim.gardner@canonical.com>,
Khalid ElMously <khalid.elmously@canonical.com>,
"Cox, Philip" <philip.cox@canonical.com>,
the arch/x86 maintainers <x86@kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
"linux-coco@lists.linux.dev" <linux-coco@lists.linux.dev>,
linux-efi <linux-efi@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
"Yao, Jiewen" <jiewen.yao@intel.com>
Subject: RE: [PATCHv7 00/14] mm, x86/cc: Implement support for unaccepted memory
Date: Tue, 19 Jul 2022 02:48:54 +0000 [thread overview]
Message-ID: <MW4PR11MB5872F205FE3F9B11CAFACBA18C8F9@MW4PR11MB5872.namprd11.prod.outlook.com> (raw)
In-Reply-To: <CAAH4kHYR+VkSJ5J8eWmeaEvstuRz_EuqVQqPfwmp5dhNGRyJwQ@mail.gmail.com>
Hey
I posted my comment on Bugzilla https://bugzilla.tianocore.org/show_bug.cgi?id=3987
Let's achieve EDKII/UEFI related discussion there.
Thank you
Yao, Jiewen
> -----Original Message-----
> From: Dionna Amalie Glaze <dionnaglaze@google.com>
> Sent: Tuesday, July 19, 2022 7:32 AM
> To: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Cc: Ard Biesheuvel <ardb@kernel.org>; Peter Gonda <pgonda@google.com>;
> Borislav Petkov <bp@alien8.de>; Lutomirski, Andy <luto@kernel.org>;
> Christopherson,, Sean <seanjc@google.com>; Andrew Morton <akpm@linux-
> foundation.org>; Rodel, Jorg <jroedel@suse.de>; Andi Kleen
> <ak@linux.intel.com>; Kuppuswamy Sathyanarayanan
> <sathyanarayanan.kuppuswamy@linux.intel.com>; David Rientjes
> <rientjes@google.com>; Vlastimil Babka <vbabka@suse.cz>; Tom Lendacky
> <thomas.lendacky@amd.com>; Thomas Gleixner <tglx@linutronix.de>; Peter
> Zijlstra <peterz@infradead.org>; Paolo Bonzini <pbonzini@redhat.com>; Ingo
> Molnar <mingo@redhat.com>; Varad Gautam <varad.gautam@suse.com>;
> Dario Faggioli <dfaggioli@suse.com>; Hansen, Dave <dave.hansen@intel.com>;
> Mike Rapoport <rppt@kernel.org>; David Hildenbrand <david@redhat.com>;
> Marcelo Cerri <marcelo.cerri@canonical.com>; tim.gardner@canonical.com;
> Khalid ElMously <khalid.elmously@canonical.com>; Cox, Philip
> <philip.cox@canonical.com>; the arch/x86 maintainers <x86@kernel.org>;
> Linux Memory Management List <linux-mm@kvack.org>; linux-
> coco@lists.linux.dev; linux-efi <linux-efi@vger.kernel.org>; LKML <linux-
> kernel@vger.kernel.org>; Yao, Jiewen <jiewen.yao@intel.com>
> Subject: Re: [PATCHv7 00/14] mm, x86/cc: Implement support for unaccepted
> memory
>
> > I've talked with our firmware expert today and I think we have a problem
> > with the approach when kernel declaries support of unaccepted memory.
> >
>
> Is this Jiewen Yao? I've been trying to design the UEFI spec change
> with him. The bootloader problem he commented with this morning was
> something I wasn't fully considering.
>
> > This apporach doesn't work if we include bootloader into the picture: if
> > EBS() called by bootloader we still cannot know if target kernel supports
> > unaccepted memory and we return to the square 1.
> >
> > I think we should make it obvious from a kernel image if it supports
> > unaccepted memory (with UTS_VERSION or other way).
> >
> > Any comments?
>
> Is this binary parsing trick already used in EDK2? If not, I wouldn't
> want to introduce an ABI-solidifying requirement like that.
>
> A bit more cumbersome, but more flexible way to enable the feature is
> an idea I had in a meeting today:
> Make unaccepted memory support a feature-enabling EFI driver installed
> to the EFI system partition.
>
> * The first time you boot (setup mode), you install an EFI driver that
> just sets a feature Pcd to true (using a custom protocol as Ard had
> suggested above).
> * The second time you boot, if the feature Pcd is true, then the UEFI
> is free to not accept memory and use the unaccepted memory type. The
> bootloader will run after unaccepted memory has been allowed already,
> so there is no accept-all event.
>
> The default behavior will be to accept all memory when GetMemoryMap is
> called unless the feature pcd is set to true.
>
> We can then say this driver isn't needed once some new generation of
> this technology comes along and we can require unaccepted memory
> support as part of that technology's baseline, or we manage to update
> the UEFI spec to have GetMemoryMapEx which has unaccepted memory
> support baked in and the bootloaders all know to use it.
>
> The cloud experience will be, "is boot slow? Install this EFI driver
> from the cloud service provider" to tell the UEFI to enable unaccepted
> memory.
>
> --
> -Dionna Glaze, PhD (she/her)
prev parent reply other threads:[~2022-07-19 2:49 UTC|newest]
Thread overview: 139+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-14 12:02 [PATCHv7 00/14] mm, x86/cc: Implement support for unaccepted memory Kirill A. Shutemov
2022-06-14 12:02 ` [PATCHv7 01/14] x86/boot: Centralize __pa()/__va() definitions Kirill A. Shutemov
2022-06-23 17:37 ` Dave Hansen
2022-06-14 12:02 ` [PATCHv7 02/14] mm: Add support for unaccepted memory Kirill A. Shutemov
2022-06-14 12:57 ` Gupta, Pankaj
2022-06-17 19:28 ` Tom Lendacky
2022-06-17 20:53 ` Tom Lendacky
2022-07-21 15:14 ` Borislav Petkov
2022-07-21 15:49 ` Dave Hansen
2022-07-22 19:18 ` Borislav Petkov
2022-07-22 19:30 ` Dave Hansen
2022-07-25 12:23 ` Borislav Petkov
2022-07-25 12:38 ` David Hildenbrand
2022-07-25 12:53 ` Borislav Petkov
2022-07-26 14:30 ` David Hildenbrand
2022-07-25 13:00 ` Mike Rapoport
2022-07-25 13:05 ` Borislav Petkov
2022-08-05 11:49 ` Vlastimil Babka
2022-08-05 12:09 ` David Hildenbrand
2022-08-05 13:38 ` Vlastimil Babka
2022-08-05 14:22 ` David Hildenbrand
2022-08-05 14:53 ` Dave Hansen
2022-08-05 14:41 ` Dave Hansen
2022-08-05 18:17 ` Vlastimil Babka
2022-08-08 15:55 ` Dave Hansen
2022-08-10 14:19 ` Mel Gorman
2022-08-15 21:08 ` Dionna Amalie Glaze
2022-08-15 22:02 ` Tom Lendacky
2022-08-29 16:02 ` Dionna Amalie Glaze
2022-08-29 16:19 ` Dave Hansen
2022-09-06 17:50 ` Dionna Amalie Glaze
2022-09-08 12:11 ` Mike Rapoport
2022-09-08 16:23 ` Dionna Amalie Glaze
2022-09-08 19:28 ` Mike Rapoport
2022-09-22 14:31 ` Tom Lendacky
2022-09-24 1:03 ` Kirill A. Shutemov
2022-09-24 9:36 ` Mike Rapoport
2022-09-26 12:10 ` Kirill A. Shutemov
2022-09-26 13:38 ` Tom Lendacky
2022-09-26 15:42 ` Kirill A. Shutemov
2022-09-26 15:42 ` Tom Lendacky
2022-06-14 12:02 ` [PATCHv7 03/14] mm: Report unaccepted memory in meminfo Kirill A. Shutemov
2022-07-26 14:33 ` David Hildenbrand
2022-06-14 12:02 ` [PATCHv7 04/14] efi/x86: Get full memory map in allocate_e820() Kirill A. Shutemov
2022-07-25 13:02 ` Borislav Petkov
2022-06-14 12:02 ` [PATCHv7 05/14] x86/boot: Add infrastructure required for unaccepted memory support Kirill A. Shutemov
2022-06-15 10:19 ` Peter Zijlstra
2022-06-15 15:05 ` Kirill A. Shutemov
2022-07-17 17:16 ` Borislav Petkov
2022-07-25 21:33 ` Borislav Petkov
2022-06-14 12:02 ` [PATCHv7 06/14] efi/x86: Implement support for unaccepted memory Kirill A. Shutemov
2022-06-22 19:58 ` Dave Hansen
2022-07-26 8:35 ` Borislav Petkov
2022-06-14 12:02 ` [PATCHv7 07/14] x86/boot/compressed: Handle " Kirill A. Shutemov
2022-06-14 12:02 ` [PATCHv7 08/14] x86/mm: Reserve unaccepted memory bitmap Kirill A. Shutemov
2022-07-26 9:07 ` Borislav Petkov
2022-11-30 1:28 ` Kirill A. Shutemov
2022-12-01 9:37 ` Mike Rapoport
2022-12-01 13:47 ` Kirill A. Shutemov
2022-06-14 12:02 ` [PATCHv7 09/14] x86/mm: Provide helpers for unaccepted memory Kirill A. Shutemov
2022-06-14 12:02 ` [PATCHv7 10/14] x86/mm: Avoid load_unaligned_zeropad() stepping into " Kirill A. Shutemov
2022-06-23 17:19 ` Dave Hansen
2022-07-26 10:21 ` Borislav Petkov
2022-08-02 23:46 ` Dave Hansen
2022-08-03 14:02 ` Dave Hansen
2022-08-11 11:26 ` Borislav Petkov
2022-08-13 16:11 ` Andy Lutomirski
2022-08-13 21:13 ` Kirill A. Shutemov
2022-08-13 16:04 ` Andy Lutomirski
2022-08-13 20:58 ` Kirill A. Shutemov
2022-07-26 17:25 ` Borislav Petkov
2022-07-26 17:46 ` Dave Hansen
2022-07-26 20:17 ` Andy Lutomirski
2022-08-09 11:38 ` Kirill A. Shutemov
2022-08-13 16:03 ` Andy Lutomirski
2022-08-13 21:02 ` Kirill A. Shutemov
2022-06-14 12:02 ` [PATCHv7 11/14] x86: Disable kexec if system has " Kirill A. Shutemov
2022-06-23 17:23 ` Dave Hansen
2022-06-23 21:48 ` Eric W. Biederman
2022-06-24 2:00 ` Kirill A. Shutemov
2022-06-28 23:51 ` Kirill A. Shutemov
2022-06-29 0:10 ` Dave Hansen
2022-06-29 0:59 ` Kirill A. Shutemov
2022-07-04 7:18 ` Dave Young
2022-06-14 12:02 ` [PATCHv7 12/14] x86/tdx: Make _tdx_hypercall() and __tdx_module_call() available in boot stub Kirill A. Shutemov
2022-06-23 17:25 ` Dave Hansen
2022-06-14 12:02 ` [PATCHv7 13/14] x86/tdx: Refactor try_accept_one() Kirill A. Shutemov
2022-06-23 17:31 ` Dave Hansen
2022-07-26 10:58 ` Borislav Petkov
2022-06-14 12:02 ` [PATCHv7 14/14] x86/tdx: Add unaccepted memory support Kirill A. Shutemov
2022-06-24 16:22 ` Dave Hansen
2022-06-27 10:42 ` Kirill A. Shutemov
2022-07-26 14:51 ` Borislav Petkov
2022-08-09 11:45 ` Kirill A. Shutemov
2022-08-10 10:27 ` Borislav Petkov
2022-06-24 16:37 ` [PATCHv7 00/14] mm, x86/cc: Implement support for unaccepted memory Peter Gonda
2022-06-24 16:57 ` Dave Hansen
2022-06-24 17:06 ` Marc Orr
2022-06-24 17:09 ` Dave Hansen
2022-06-24 17:15 ` Peter Gonda
2022-06-24 17:19 ` Marc Orr
2022-06-24 17:21 ` Peter Gonda
2022-06-24 17:47 ` Dave Hansen
2022-06-24 18:10 ` Peter Gonda
2022-06-24 18:13 ` Dave Hansen
2022-06-24 17:40 ` Michael Roth
2022-06-24 17:58 ` Michael Roth
2022-06-24 18:05 ` Peter Gonda
2022-06-27 11:30 ` Kirill A. Shutemov
2022-06-27 11:54 ` Ard Biesheuvel
2022-06-27 12:22 ` Kirill A. Shutemov
2022-06-27 16:17 ` Peter Gonda
2022-06-27 16:33 ` Ard Biesheuvel
2022-06-27 22:38 ` Kirill A. Shutemov
2022-06-28 17:17 ` Ard Biesheuvel
2022-07-18 17:21 ` Kirill A. Shutemov
2022-07-18 23:32 ` Dionna Amalie Glaze
2022-07-19 0:31 ` Dionna Amalie Glaze
2022-07-19 18:29 ` Dionna Amalie Glaze
2022-07-19 19:13 ` Borislav Petkov
2022-07-19 20:45 ` Ard Biesheuvel
2022-07-19 21:23 ` Borislav Petkov
2022-07-19 21:35 ` Dave Hansen
2022-07-19 21:50 ` Borislav Petkov
2022-07-19 22:01 ` Kirill A. Shutemov
2022-07-19 22:02 ` Dave Hansen
2022-07-19 22:08 ` Tom Lendacky
2022-07-20 0:26 ` Marc Orr
2022-07-20 5:44 ` Borislav Petkov
2022-07-20 17:03 ` Marc Orr
2022-07-22 15:07 ` Borislav Petkov
2022-07-21 17:12 ` Dave Hansen
2022-07-23 11:14 ` Ard Biesheuvel
2022-07-28 22:01 ` Dionna Amalie Glaze
2022-08-09 11:14 ` Kirill A. Shutemov
2022-08-09 11:36 ` Ard Biesheuvel
2022-08-09 11:54 ` Kirill A. Shutemov
2022-08-09 21:09 ` Dionna Amalie Glaze
2022-07-19 2:48 ` Yao, Jiewen [this message]
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