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Re: [PATCH v2 1/3] x86/vmx: implement Bus Lock detection
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Fri, 3 Jun 2022 16:29:17 +0200
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- Cc: Jun Nakajima <jun.nakajima@xxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 03 Jun 2022 14:29:47 +0000
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On Fri, Jun 03, 2022 at 02:16:47PM +0200, Jan Beulich wrote:
> 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@xxxxxxxxxx>
> > Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> 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.
Maybe:
"x86/vmx: add Bus Lock detection to the hypervisor"
Thanks, Roger.
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