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RE: [PATCH v4 1/3] x86/vmx: implement VMExit based guest Bus Lock detection
- To: Pau Monné, Roger <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
- Date: Wed, 14 Dec 2022 06:09:08 +0000
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- Cc: Pau Monné, Roger <roger.pau@xxxxxxxxxx>, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>, "Beulich, Jan" <JBeulich@xxxxxxxx>, "andrew.cooper3@xxxxxxxxxx" <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Wed, 14 Dec 2022 06:10:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHZDxCBORosQTsnbEKGSZV8tCFS9K5s5s7w
- Thread-topic: [PATCH v4 1/3] x86/vmx: implement VMExit based guest Bus Lock detection
> From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
> Sent: Wednesday, December 14, 2022 12:31 AM
>
> Add support for enabling guest 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.
>
> Note EXIT_REASON_BUS_LOCK VMExits will always have bit 26 set in
> exit_reason, and hence the performance counter doesn't need to be
> increased for EXIT_REASON_BUS_LOCK handling.
>
> Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
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