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Re: [PATCH 00/21] x86: Trenchboot Secure Launch DRTM (Xen)
- To: Sergii Dmytruk <sergii.dmytruk@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 22 Apr 2025 18:14:30 +0100
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Lukasz Hawrylko <lukasz@xxxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Mateusz Mówka <mateusz.mowka@xxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, trenchboot-devel@xxxxxxxxxxxxxxxx
- Delivery-date: Tue, 22 Apr 2025 17:14:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 22/04/2025 4:06 pm, Sergii Dmytruk wrote:
> The aim of the [TrenchBoot] project is to provide an implementation of
> DRTM that is generic enough to cover various use cases:
> - Intel TXT and AMD SKINIT on x86 CPUs
> - legacy and UEFI boot
> - TPM1.2 and TPM2.0
> - (in the future) DRTM on Arm CPUs
>
> DRTM is a version of a measured launch that starts on request rather
> than at the start of a boot cycle. One of its advantages is in not
> including the firmware in the chain of trust.
>
> Xen already supports DRTM via [tboot] which targets Intel TXT only.
> tboot employs encapsulates some of the DRTM details within itself while
> with TrenchBoot Xen (or Linux) is meant to be a self-contained payload
> for a TrenchBoot-enabled bootloader (think GRUB). The one exception is
> that UEFI case requires calling back into bootloader to initiate DRTM,
> which is necessary to give Xen a chance of querying all the information
> it needs from the firmware before performing DRTM start.
>
> From reading the above tboot might seem like a more abstracted, but the
> reality is that the payload needs to have DRTM-specific knowledge either
> way. TrenchBoot in principle allows coming up with independent
> implementations of bootloaders and payloads that are compatible with
> each other.
>
> The "x86/boot: choose AP stack based on APIC ID" patch is shared with
> [Parallelize AP bring-up] series which is required here because Intel
> TXT always releases all APs simultaneously. The rest of the patches are
> unique.
I've stripped out the sha2 patch and fixed up to use the existing sha2,
then kicked off some CI testing:
https://gitlab.com/xen-project/hardware/xen-staging/-/pipelines/1780285393
https://cirrus-ci.com/build/5452335868018688
When the dust has settled, I'll talk you through the failures.
~Andrew
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