Re: [Xen-devel] xc_hvm_inject_trap() races

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

On 11/02/2016 10:49 AM, Jan Beulich wrote:
> The fact that {vmx,svm}_inject_trap() combine the new exception
> with an already injected one (and blindly discard events other than
> hw exceptions), otoh, looks like indeed wants to be controllable by
> the caller: When the event comes from the outside (the hypercall),
> it would clearly seem better to simply tell the caller that no injection
> happened and the event needs to be kept pending.

However this is not possible with the current design, since all
xc_hvm_inject_trap() really does is set the info to be used at
hvm_do_resume() time. So at the time xc_hvm_inject_trap() returns, it's
not yet possible to know if the injection will succeed or not (assuming
we discard it when it would collide with another).


Thanks,
Razvan

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