On 07.03.2025 00:35, Andrew Cooper wrote:
> We've already scanned features by the time init_e820() is called. Remove the
> cpuid() calls.
>
> Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Reviewed-by: Jan Beulich <jbeul...@suse.com>
> Backporting. Not sure it's worth backporing, but it is safe (just) to
> backport past commit 365f408339d3 ("x86/boot: Load microcode much earlier on
> boot"). That commit was the last one to reposition early_cpu_init().
At least I wouldn't consider such cleanup to be an obvious backporting
candidate.
> I'm pretty sure that all 64bit CPUs have MTRR, but I'm less certain if
> dropping the check is wise given the variety of VM configurations that exist.
We did consider exposing PAT-only configurations to guests, so I don't think
we should be implying MTRR from being 64-bit (unless we know cpu_has_hypervisor
is false).
Jan
