Re: [Xen-devel] IDE DMA not supported in 1.0?

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>]

> Is this correct?
> 
> [root@xendemo0 root]# hdparm /dev/hda
> /dev/hda:
>  HDIO_GET_DMA failed: Function not implemented
> ...

/dev/hda is the Xen Virtual Block Device Driver that talks to the
idealised IO interface exported by Xen. It doesn't implement the
HDIO ioctls because they're not really relevant (it's not an IDE
hard disk). The communication is via shared memory, so is high
performance. 

As to whether Xen is using DMA with your hardware, you'll need to
take a look at the boot messages as Xen comes up. One of the
items on our todo list is to make those messages available from
domain0 after boot, but for now, they only flash by on the VGA
console unless you've attached a serial line.

Best,
Ian


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