On 2/23/2025 10:14 PM, Baoquan He wrote:

Hi Steve, Mimi,

On 02/18/25 at 02:54pm, steven chen wrote:

quoted

Currently, the mechanism to map and unmap segments to the kimage
structure is not available to the subsystems outside of kexec.  This
functionality is needed when IMA is allocating the memory segments
during kexec 'load' operation.  Implement functions to map and unmap
segments to kimage.

I am done with the whole patchset understanding. My concern is if this
TPM PCRs content can be carried over through newly introduced KHO. I can
see that these patchset doesn't introduce too much new code changes,
while if many conponents need do this, kexec reboot will be patched all
over its body and become ugly and hard to maintain.

Please check Mike Rapoport's v4 patchset to see if IMA can register
itself to KHO and do somthing during 2nd kernel init to restore those
TPM PCRs content to make sure all measurement logs are read correctly.
[PATCH v4 00/14] kexec: introduce Kexec HandOver (KHO)

Thanks
Baoquan

Hi Baoquan,

For IMA, it appears that there are no current issues with TPM PCRs after 
a kernel soft reboot.

This patches is used to get currently missed IMA measurements during the 
kexec process copied to new kernel after the kernel soft reboot. I think 
it's ok to leave it at current location: it will be easy to maintain for 
IMA.

Overall, for these patches, do you see any major blockers for kexec?

If you have any specific concerns or need further details, please let me 
know.

Thanks,

Steven