Re: [Xen-devel] [PATCH] patch to buffer write ioreq

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 21 Jun 2006, at 10:22, Han, Zhu wrote:

> This patch implements a new mechanism to buffer the MMIO_WRITE and
> PIO_WRITE packet in a queue, and then submit them to qemu-dm in batch.
> This could save a lot of domain switch time. We implement this as a
> generic one to do ioreq in batch. However, we only use it to batch the
> MMIO_WIRTE request for stdvga(0xA0000-0xC0000) in order to solve the
> win2k boot issue for hvm domain.
> Without this patch, win2k cannot boot up on HVM domain.
Couldn't we just have the VGA area as shared memory, like we do for 
SVGA? Wouldn't that be faster and simpler?
This batched-write mechanism will be redundant when we move to doing 
all decode and emulation in qemu-dm. (Although I suppose we could keep 
a really simple decoder in Xen just for certain types of MOV.)
 -- Keir


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