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Re: [Xen-devel] [PATCH] x86/hvm: Add debug exception vm_events

On Wed, Apr 27, 2016 at 11:57 PM, Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx> wrote:
On 04/27/16 23:33, Tamas K Lengyel wrote:
> 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.

The monitor / event code looks fine, but I'm not sure about
hvm_event_type / hvm_monitor_event(). Presumably even a CR3 write event
coming from a HVM guest is an event, and HVM-related, hence a hvm_event
- i.e. the generic nature of the name is a bit confusing to me. Maybe
not so to other reviewers?

Yea, I'm not too happy with the naming in general for hvm/event, it all should be renamed to be clear that it's part of the monitor subsystem. I think I'll turn this into a 2-patch series, where I rename the existing stuff from hvm/event to hvm/monitor then change the name of this function from hvm_monitor_breakpoint to hvm_monitor_debug.


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