Re: [PATCH 2/3] x86/speculation: Support Automatic IBRS

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On 11/5/22 6:39 AM, David Laight wrote:
From: Borislav Petkov
Sent: 04 November 2022 21:52

On Fri, Nov 04, 2022 at 04:36:50PM -0500, Kim Phillips wrote:
  - Allow for spectre_v2=autoibrs in the kernel command line,
    reverting to auto-selection if the feature isn't available.

Why?

What the whole logic here should do is enable autoibrs when detected
automatically, without the need for the user to even select it as it is
the superior mitigation.

The only useful option is to allow a different option be
selected for code testing.
So maybe you want an option for completeness - for when
an 'even better' option is available.

This is true.

Kim



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