[edk2-devel] [PATCH 00/14] Introduce Lazy-accept for Tdx guest

[Gerd Hoffmann]

  Hi,

> 3.  fw_cfg
>   - Add new fw_cfg item (opt/ovmf/AcceptAllMemory) to indicate how to handle the unaccepted memory.
>       > True - accept all the memory
>       > False - don't accept the memory
>       > Default - It allows the firmware to choose depending on various factors.
>   - Glaze has submit the patch https://lore.kernel.org/all/20220620223300.1555849-1-dionnaglaze@google.com/

> Proposal 3) only works for QEMU because of fw_cfg.

Well, while that is true for the patch at hand it doesn't have to be
that way.  We can also simply store the config option in a EFI variable.
Wire up a HII configuration so it can be changed via firmware setup.
Allow setting the EFI variable from fw_cfg, so qemu users can set that
on the qemu command line too (and possibly have similar mechanisms for
other hypervisors, hello cloudhv).

> I wonder if lazy-accept feature can be split into 2 stages. 
> 1. In first stage there is a config option to indicate if lazy-accept is enabled or not.
> 2. In the second stage the automatic negotiation is introduced so that lazy-accept is enabled or not by the negotiation result.

Absolutely.  That is one of the reasons why I suggested to have a
true/false/default config option instead of just true/false.

When the first stage is implemented "default" behavior would be fixed
(either hard-coded or a compile-time option).

When the second stage is implemented "default" behavior would be
dynamic, depending on the negotiation result.

take care,
  Gerd



-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#92469): https://edk2.groups.io/g/devel/message/92469
Mute This Topic: https://groups.io/mt/91570192/1813853
Group Owner: devel+owner at edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [edk2-devel-archive at redhat.com]
-=-=-=-=-=-=-=-=-=-=-=-