Re: [PATCH v5 0/5] TDX host: kexec() support

Huang, Kai
2024-08-19T22:16:23Z

On 20/08/2024 9:21 am, Sagi Shahar wrote:
>> Currently kexec() support and TDX host are muturally exclusive in the
>> Kconfig. This series adds the TDX host kexec support so that they can
>> work together and can be enabled at the same time in the Kconfig.
>
> I tried testing the kexec functionality and noticed that the TDX module
> fails initialization on the second kernel so you can't actually kexec
> between 2 kernels that enable TDX. Is that the expected behavior? Are
> there future patches to enable that functionality?
>

Thanks for testing!

Yes this is the expected behaviour. If the first kernel has enabled
TDX, then the second kernel will fail to init TDX. The reason the first
SEAMCALL to initialize TDX module in the second kernel will fail due to
module having been initialized.

However if the first kernel has not enabled TDX, the second kernel is
able to enable it.