Re: [PATCH 0/3] x86/speculation: Support Automatic IBRS

[Dave Hansen]

On 11/4/22 14:36, Kim Phillips wrote:
> The AMD Zen4 core supports a new feature called Automatic IBRS.
> (Indirect Branch Restricted Speculation).
> 
> Enable Automatic IBRS by default if the CPU feature is present.
> It typically provides greater performance over the incumbent
> generic retpolines mitigation.

Could you also share some information on how this differs from EIBRS and
why it needs to exist in parallel to EBIRS?