Re: [PATCH v3] x86/bugs: Add a separate config for each mitigation

[Dave Hansen]

On 9/28/23 05:45, Breno Leitao wrote:
> 1) Create one Kconfig entry per mitigation, so, the user can pick and
> choose what to enable and disable. (Version 3 of this patch. May need a
> re-spin due to the new mitigations being added.)

This means, what, roughly 18 today?

#define X86_BUG_CPU_MELTDOWN		X86_BUG(14)
...
#define X86_BUG_GDS                     X86_BUG(30)

Plus two bonus ones:

#define X86_BUG_SRSO                    X86_BUG(1*32 + 0)
#define X86_BUG_DIV0                    X86_BUG(1*32 + 1)

... and we've slowed down the rate at which we're adding these, but
we're still seeing a couple a year.

Perhaps Pawan and the others actually _doing_ the patches for these can
speak up, but I don't think adding a Kconfig option will be too much
additional work for each new X86_BUG.

I still think it's highly unlikely that someone will come through and
pick and choose among a few dozen vulnerabilities.