Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

Linus Torvalds writes: (Summary) wrote:

[...]

fix it.
So I do think that the original patch is buggy.
So I do think that the original patch is buggy.
What I think *may* be going on is:
What I think *may* be going on is:
- first we do that
- first we do that
get_cpu_cap(c);
get_cpu_address_sizes(c);
get_cpu_address_sizes(c);

     but at that point, CPU levels may be masked, and that 0x80000008 leaf
isn't seen

  - then we do

                 if (this_cpu->c_early_init)
                         this_cpu->c_early_init(c);