Re: [Xen-devel] [PATCH v7 2/3] x86/vm_event: Add HVM debug exception vm_events

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Tamas K Lengyel [mailto:tamas@xxxxxxxxxxxxx]
> Sent: Tuesday, June 28, 2016 2:08 AM
> 
> Since in-guest debug exceptions are now unconditionally trapped to Xen, adding
> a hook for vm_event subscribers to tap into this new always-on guest event. We
> rename along the way hvm_event_breakpoint_type to hvm_event_type to better
> match the various events that can be passed with it. We also introduce the
> necessary monitor_op domctl's to enable subscribing to the events.
> 
> This patch also provides monitor subscribers to int3 events proper access
> to the instruction length necessary for accurate event-reinjection. Without
> this subscribers manually have to evaluate if the int3 instruction has any
> prefix attached which would change the instruction length.
> 
> Signed-off-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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