From: Jason Gunthorpe <jgg@nvidia.com>
To: Alexandre Ghiti <alex@ghiti.fr>,
Albert Ou <aou@eecs.berkeley.edu>,
Ard Biesheuvel <ardb@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Jonathan Corbet <corbet@lwn.net>, David Sterba <dsterba@suse.com>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-doc@vger.kernel.org, linux-efi@vger.kernel.org,
linux-riscv@lists.infradead.org,
Mark Rutland <mark.rutland@arm.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <pjw@kernel.org>,
Randy Dunlap <rdunlap@infradead.org>,
Simon Glass <sjg@chromium.org>,
Shuah Khan <skhan@linuxfoundation.org>,
Nick Terrell <terrelln@fb.com>, Will Deacon <will@kernel.org>
Cc: "Alexandre Ghiti" <alexghiti@rivosinc.com>,
"Conor Dooley" <conor.dooley@microchip.com>,
"Jonathan Cameron" <jonathan.cameron@oss.qualcomm.com>,
linux-integrity@vger.kernel.org,
"Palmer Dabbelt" <palmer@rivosinc.com>,
patches@lists.linux.dev, "Piotr Król" <piotr.krol@3mdeb.com>,
"Ross Philipson" <ross.philipson@gmail.com>,
"Sami Tolvanen" <samitolvanen@google.com>,
"Song Shuai" <songshuaishuai@tinylab.org>
Subject: Re: [PATCH v2 00/15] arm64: DRTM, boot portion
Date: Fri, 16 Oct 2026 13:51:35 -0300 [thread overview]
Message-ID: <20261016165135.GA494690@nvidia.com> (raw)
In-Reply-To: <0-v2-989a18390eb1+486-arm64_drtm_jgg@nvidia.com>
On Fri, Oct 02, 2026 at 08:31:37PM -0300, Jason Gunthorpe wrote:
> - Non-EFI boot, particularly kexec
At least the kexec issue seems like it has a good solution, Ard
created a way for kexec to use the EFI entry point, and we've shown
now that this series plus Ard's work can kexec directly into a UKI and
DRTM into the successor kernel. Pretty amazing.
There is a thread here:
https://lore.kernel.org/r/5236ef55-28b4-4331-8c7d-a6d112aa185f@app.fastmail.com
Based on this, I think a clean picture for x86 is coming into focus
now.
I recommend that the x86 side create a "EFI helper", this would be a
dedicated project and include something similar to the EFI package
with GUID and the trampolines. As a dedicated github with as its own
upstream it doesn't require any help from the grub community.
The general boot flow would have this helper provide functions to the
Linux stub, like has already been sketched out with the EFI package
guid scheme.
The helper would implement something very similar to ARM's DRTM spec,
with the same kind of DLME layout and so on. This will give us a very
strong cross-arch alignment and help create a basis for any furture
industry work on DRTM.
I feel like this is not a hard job with some AI assistance. If this is
still unlcear I may be able to help show it with more details.
That doesn't change anything about this series. I think anyone who can
implement a sane protocol natively should just do so in the built in
EFI stub. The external helper is more because x86 has so many tricky
platform details, needs more ACPI parsing, external binary blob
firmware and so on.
Regards,
Jason
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prev parent reply other threads:[~2026-10-16 16:52 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-02 23:31 [PATCH v2 00/15] arm64: DRTM, boot portion Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 01/15] efi/libstub: Fix error unwind freeing fdt in allocate_new_fdt_and_exit_boot() Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 02/15] efi/riscv: libstub: Don't set image_size in handle_kernel_image() Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 03/15] efi/libstub: Free cmdline_ptr in efi_pe_entry Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 04/15] efi/libstub: Add a general way to get symbols from the vmlinux into zboot Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 05/15] arm64/efi: Use CONFIG_EFI_STUB_IMAGE_INFO for code_size Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 06/15] efi/zboot: Lift efi_cache_sync_image() from efi_zboot_decompress() Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 07/15] efi/libstub: Add generic arch callbacks for DRTM Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 08/15] efi/libstub: Have efi_kaslr_relocate_kernel() handle extra_size Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 09/15] efi: Add a __efi_data_handoff section annotation Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 10/15] efi/libstub: Put the stub's writable data in unique sections for DRTM Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 11/15] arm64: drtm: Add macro definitions for DEN0113 Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 12/15] arm64: drtm: Update the linker script for EFI_STUB_DRTM Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 13/15] arm64: drtm: Add drtm_entry point to head.S Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 14/15] arm64: drtm: Call UNPROTECT_MEMORY Jason Gunthorpe
2026-10-02 23:31 ` [PATCH v2 15/15] efi/arm64: Implement ARM64 DRTM in the stub Jason Gunthorpe
2026-10-16 16:54 ` Jason Gunthorpe
2026-10-06 10:30 ` [PATCH v2 00/15] arm64: DRTM, boot portion Ard Biesheuvel
2026-10-16 16:51 ` Jason Gunthorpe [this message]
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