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

Sagi Shahar
2024-08-19T22:28:25Z

On Mon, Aug 19, 2024 at 5:16 PM Huang, Kai <kai.huang@intel.com> wrote:
>
>
>
> 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.

Are there any plans to support both kernels being able to enable TDX
in the future? Either by changes to KVM or the TDX module?