[MODERATED] Re: [PATCH v4 06/10] [PATCH v4 6/9] Linux Patch #6

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Tue, Apr 24, 2018 at 08:46:46PM +0200, speck for Borislav Petkov wrote:
> On Tue, Apr 24, 2018 at 02:07:50PM -0400, speck for Konrad Rzeszutek Wilk wrote:
> > And it nicely slurps it up from the CPUID.7.EDX[31].
> 
> Yap.
> 
> > Which means patch #7 is good - just needs a better name for the
> > X86_FEATURE_SPEC_STORE_BYPASS_DISABLE_BECAUSE_I_LIKE_LONG_NAMES
> > 
> 
> Huh?
> 
> You either use X86_FEATURE_RDS
> 
> XOR
> 
> X86_FEATURE_SPEC_STORE_BYPASS_DISABLE
> 
> No need for both.

We need two CPU bit flags. First to say:

 1). I am able to mitigate. This will be via X86_FEATURE_RDS for both
    AMD and Intel.

 2). I _want_ to mitigate. This will be via X86_FEATURE_SPEC_STORE_BYPASS_DISABLE
   to tell the init_amd_bd,init_amd_zn,init_amd_jg, and init_intel
   to do its magic.


> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
> --