[Xen-devel] Re: [PATCH] PIT acceleration enhancement

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 22 Feb 2006, at 15:07, Edwin Zhai wrote:

> PIT acceleration enhancement
> add a new flag in HV to control whether re-arm the actimer and handle 
> guest PIT io, by this we can
> * stop the actimer and io interception if guest change previous 
> periodic mode to other mode.
> * safely handle reinitialization of periodic mode from guest
>
> Signed-off-by: Edwin Zhai <edwin.zhai@xxxxxxxxx>
> Signed-off-by: Yunhong Jiang <yunhong.jiang@xxxxxxxxx>
> Signed-off-by: Eddie Dong <eddie.dong@xxxxxxxxx>
Please can you just sync the PIT code with the current qemu tree and 
move the whole lot down into Xen? The current split between dom0 and 
xen is unnecessary and gross, and I hate this piecemeal ad hoc 
migration of PIT functionality from dom0 down to xen. Just move it all 
in one go.
The only things that should need implementing in qemu-dm are devices 
whose backend cannot be implemented in Xen (net, disc, keyboard, mouse, 
....) -- generally real peripheral devices. Platform devices like PITs 
and PICs should be done entirely in Xen.
 -- Keir


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