Re: [Crash-utility] What is the current state of the 5-level page tables in Crash
----- Original Message -----
Dear Dave,
I saw your commit
307e7f35f510("First phase of future support for x86_64 5-level page
tables.")
in crash git-tree. It is the preparatory for x86_64 5-level page tables.
There may be more things to be done to support for 5-level.
Right. There needs to be a manner of determining very early on whether
the kernel page tables are using 5-level. And during crash runtime, there
needs to be a manner of determining whether each user-space task is using
4- or 5-level page tables. Also, it may be possible/preferable to
squeeze the 5-level support into the currently existing x86_64_kvtop() and
x86_64_uvtop() functions instead of using the new xxx_5level() function
placeholders that I added in the preparatory patch.
I hope to know:
1. What is the current state of the 5-level page table in Crash?
I have done nothing further beyond than the preparatory steps in that commit.
2. If there are some reason that we should pause the support work of
5-level page tables currently.
No, not really. I originally delayed further work because originally it
was enabled by kernel CONFIG, but as I understand it now, it is enabled by
a combination of a kernel CONFIG and a boot command line option? But
since I have never seen or worked with a kernel with it enabled, I've
not done anything further.
3. Are you already doing it?
No. Are you offering to complete the work?
Thanks,
Dave