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Re: [Xen-devel] Question: direct I/O for system volume


Jun Kamada, le Thu 28 Aug 2008 18:31:23 +0900, a Ãcrit :
> On Thu, 28 Aug 2008 09:59:08 +0100
> Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx> wrote:
> > Jun Kamada, le Wed 27 Aug 2008 20:07:23 +0900, a érit :
> > > Does the functionality provide direct I/O for "system volume" in guest
> > > domain?
> > 
> > What do you call "system volume"?
> Sorry, it means "boot disk". 
> Guest software can directly see HBA(Host Bus Adapter) as a hardware 
> by using the device passthrough functionality. However, current guest
> BIOS doesn't have a capability to load and invoke expansion ROM stored 
> in the HBA, I guess. As a result, the guest OS cannot boot up from a 
> disk under the HBA.

Ok, much more clear :)
You may want to have a look at Jean Guyader's work on VGA card
pass-through, which precisely requires mapping the expansion ROM into
the guest.  In other words, the tools to achieve it are there, I guess
you just need to assemble them.


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