Keir:
 This is to to make the IDE device model multithreading so that
the VMX domain IO access completion (triggering DMA operation) can be
asynchronize with the completion of DMA operation. With this patch we
get 8%--14% performance gain for kernel build.
 Thanks, 
eddie
Yang, Xiaowei wrote:
> Originally in qemu when a IDE dma transfer is started which is
> triggered by access to 0xc000 port in VMX, qemu will blocked there
> until it finished. And during that block, there are extra dom
> switches between dom0 and idle domain, and VMX can't be resumed. By
> making real IDE dma tranfer run in another thread, qemu will return
> and VMX resume on time and there are fewer cycle wasted.
>
> Signed-off-by: Ke Yu <ke.yu@xxxxxxxxx>
> Signed-off-by: Xiaowei Yang <xiaowei.yang@xxxxxxxxx>
>
> -Xiaowei
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