Re: [PATCH v4] x86/mm/ident_map: On UV systems, use gbpages only where full GB page should be mapped.

[Pavin Joseph]

On 3/29/24 13:45, Ingo Molnar wrote:
> Just to clarify, we have the following 3 upstream (and soon to be upstream) versions:
>
>   v1: pre-d794734c9bbf kernels
>   v2: d794734c9bbf x86/mm/ident_map: Use gbpages only where full GB page should be mapped.
>   v3: c567f2948f57 Revert "x86/mm/ident_map: Use gbpages only where full GB page should be mapped."
>
> Where v1 and v3 ought to be the same in behavior.
>
> So how does the failure matrix look like on your systems? Is my
> understanding accurate:
>
>
>             regular boot  | regular kexec | nogbpages boot | nogbpages kexec boot
>   ------------------------|---------------------------------------------------
>   v1:       OK            | OK            | OK             | FAIL
>   v2:       OK            | FAIL          | FAIL           | FAIL

Slight correction:

   regular boot  | regular kexec | nogbpages boot | nogbpages kexec boot
-----------------|---------------|----------------|------------------
v1:       OK     | OK            | OK             | FAIL
v2:       OK     | FAIL          | OK             | FAIL

Pavin.