Re: [PATCH 0/2] Preserve TPM log across kexec

Stefan Berger
2024-03-07T22:32:29Z

On 3/7/24 16:42, Rob Herring wrote:
> On Wed, Mar 06, 2024 at 11:08:20AM -0500, Stefan Berger wrote:
>>
>>
>> On 3/6/24 10:55, Stefan Berger wrote:
>>> This series resolves an issue on PowerVM and KVM on Power where the memory
>>> the TPM log was held in may become inaccessible or corrupted after a kexec
>>> soft reboot. The solution on these two platforms is to store the whole log
>>> in the device tree because the device tree is preserved across a kexec with
>>> either of the two kexec syscalls.
>>>
>> FYI: This was the previous attempt that didn't work with the older kexec
>> syscall: https://lore.kernel.org/lkml/4afde78d-e138-9eee-50e0-dbd32f4dcfe0@linux.ibm.com/T/#m158630d214837e41858b03d4b025e6f96cb8f251
>
> Doesn't everyone else still need that? Is powerpc the only ones that
Are you referring to the old series with 'that' ? I more or less had to
abandon it because it wouldn't solve the problem for the old kexec
syscall, so that's why I am embedding the whole log now in the
devicetree since the DT is properly carried across the kexec soft reboot
on PowerVM and KVM for Power. Maybe other platforms will (have to)
follow, but I don't know.

> care about the old kexec syscall?
>
> Rob