Re: [Xen-devel] [PATCH v6] x86/monitor: Notify monitor if an emulation fails.

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 18/07/17 10:37, Petre Pircalabu wrote:
> If case of a vm_event with the emulate_flags set, if the instruction
> cannot be emulated, the monitor should be notified instead of directly
> injecting a hw exception.
> This behavior can be used to re-execute an instruction not supported by
> the emulator using the real processor (e.g. altp2m) instead of just
> crashing.
>
> Signed-off-by: Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>

There are many situations which end up failing an emulation with
UNHANDLEABLE.

What exact scenario are you looking to catch?  Is it just instructions
which aren't implemented in the emulator?

~Andrew

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