Re: KAISER memory layout (Re: [PATCH 06/23] x86, kaiser: introduce user-mapped percpu areas)

[Dave Hansen]

On 11/02/2017 02:41 AM, Andy Lutomirski wrote:
> 
>  - The GDT array.
>  - The IDT.
>  - The vsyscall page.  We can make this be _PAGE_USER.
>  - The TSS.
>  - The per-cpu entry stack.  Let's make it one page with guard pages
> on either side.  This can replace rsp_scratch.
>  - cpu_current_top_of_stack.  This could be in the same page as the TSS.
>  - The entry text.
>  - The percpu IST (aka "EXCEPTION") stacks.
> 
> That's it.

The PEBS/BTS buffers need it too, I think:

https://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-kaiser.git/commit/?h=kaiser-414rc6-20171031&id=97a334906d7853a8109b295ef94f3991418d0c07