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Re: [Xen-ia64-devel] cpu ops

from [Isaku Yamahata]

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To:	"Dong, Eddie" <eddie.dong@xxxxxxxxx>
Subject:	Re: [Xen-ia64-devel] cpu ops
From:	Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Date:	Tue, 8 Apr 2008 10:57:55 +0900
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On Mon, Apr 07, 2008 at 05:25:54PM +0800, Dong, Eddie wrote:
> In current approach, we have cpu ops like eoi/set_tpr/get_tpr,/set_itm
> /set_kr0/set_kr2.../set_kr7 etc.
> I think there is another simple alternative is to simply export
> setreg/getreg 
> for cpu ops.
> 
> The benefit of this could be:
>       1: Simple in pv_ops I/F
>       2: hypervisor neutral. Today we only virtualize around 15 AR/CR
> read/write,
>       But future it may extends since different Hypervisor may do in
> different way.

Sounds reasonable.
Although it would result in big switch, presumably we can eliminate
runtime switch cost by specifically handling setreg/getreg which 
might complicate binay patch slightly.

-- 
yamahata

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