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Re: [PATCH v2 1/3] x86/vmx: implement Bus Lock detection
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 7 Jun 2022 09:20:29 +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: Tue, 07 Jun 2022 07:20:39 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.06.2022 16:29, Roger Pau Monné wrote:
> 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"
Fine with me.
Jan
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