Re: [PATCH v5 1/8] x86/bugs: Allow forcing Automatic IBRS with SNP active using spectre_v2=eibrs

[Kim Phillips]

On 9/25/26 11:47 AM, Borislav Petkov wrote:
> On Thu, Sep 24, 2026 at 01:45:52PM -0500, Kim Phillips wrote:
> > For a guest-dominated host that trade plausibly goes the other way, and only
> > the admin knows their deployment.
>
> Just holding down the current arguments here *without* AI:
>
> We have had an internal discussion in the past about this already. It can
> potentially cause performance disadvantages in certain scenarios.
>
> If this is ever going to go anywhere, I would like to see:
>
> - a proper use case which people are *actually* asking for
>
> - have it properly documented in Documentation/admin-guide/hw-vuln/ along with
>    the potential impact so that people can make an *informed* decision whether
>    they really want it
This patch can be dropped for now then.

Please continue your review on patch 2/8.

Thanks,

Kim