Re: [tip: x86/urgent] x86/CPU/AMD: Add RDSEED fix for Zen5

[Jason A. Donenfeld]

On Thu, Oct 30, 2025 at 07:05:16PM +0100, Jason A. Donenfeld wrote:
> I didn't see this on LKML or any mailing list before this appeared in
> tip. Did I miss something?

Also, by the way,

Link: https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7055.html
> Until the microcode patch is deployed, the following software
> workaround options could be used: 
>
> [...]
>
> - Software can treat RDSEED returning 0 equivalent to when CF=0. Retry
>   RDSEED later until a non-zero value is returned with CF=1

You sure that's such a good idea?

Jason