Re: [PATCH v2 1/3] x86/vmx: implement Bus Lock detection

[Jan Beulich <jbeulich@suse.com>]

On 26.05.2022 13:11, Roger Pau Monne wrote:
> Add support for enabling Bus Lock Detection on Intel systems.  Such
> detection works by triggering a vmexit, which ought to be enough of a
> pause to prevent a guest from abusing of the Bus Lock.
> 
> Add an extra Xen perf counter to track the number of Bus Locks detected.
> This is done because Bus Locks can also be reported by setting the bit
> 26 in the exit reason field, so also account for those.
> 
> Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>

Reviewed-by: Jan Beulich <jbeulich@suse.com>

This implements just the VMexit part of the feature - maybe the
title wants to reflect that? The vmx: tag could also mean there
is exposure to guests included for the #DB part of the feature.

Jan