Re: [Xen-devel] [PATCH v8 0/13] remove maintenance interrupts

[harry S <harry2845@xxxxxxxxx>]

2014-10-15 15:38 GMT+08:00 Ian Campbell <ian.campbell@xxxxxxxxxx>:

On Wed, 2014-10-15 at 12:12 +0800, harry S wrote:
>
>
> I've downloaded the no_maintenance_interrupts-v4 version of

This series was merged into the mainline xen quite a while ago now.
>
>
> The writer say that this patch removes any needs for maintenance
> interrupts for both hardware and software interrupts in Xen.
>
>
> I want to know if the no needs for maintenance for software interrupts
> means that sets HCR.TGE to 0 or Xen can handle the software interrupt
> by itself.

Maintenance/interrupt handling has nothing at all to do with HCR.TGE.

Xen does not set HCR.TGE, doing so would be prohibitively expensive
since it traps all sorts of things which would then need
emulating/handling.

Ian.

I see. But I want to know if Xen can intercept the software interrupt without setting HCR.TGE to 1, or if we don't set the HCR.TGE, Xen doesn't need to handle software interrupt at all.

And in ARM does the supervisor call means the software interrupt?

Hope for reply. Thank you!

Harry

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