Re: [Xen-devel] [PATCH v4 00/04] HVM firmware passthrough

[Ross Philipson <Ross.Philipson@xxxxxxxxxx>]

> -----Original Message-----
> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
> Sent: Friday, December 21, 2012 2:46 PM
> To: Ross Philipson
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [PATCH v4 00/04] HVM firmware passthrough
> 
> On Thu, Dec 20, 2012 at 01:55:10PM -0500, Ross Philipson wrote:
> > This patch series introduces support of loading external blocks of
> > firmware into a guest. These blocks can currently contain SMBIOS
> > and/or ACPI firmware information that is used by HVMLOADER to modify a
> > guests virtual firmware at startup. These modules are only used by
> HVMLOADER and are effectively discarded after HVMLOADER has completed.
> >
> > The domain building code in libxenguest is passed these firmware
> > blocks in the xc_hvm_build_args structure and loads them into the new
> > guest, returning the load address. The loading is done in what will
> > become the guests low RAM area just behind to load location for
> > HVMLOADER. After their use by HVMLOADER they are effectively
> > discarded. It is the caller's job to load the base address and length
> > values in xenstore using the paths defined in the new hvm_defs.h
> header so HVMLOADER can located the blocks.
> >
> 
> Are there patches to plug this in the 'xl'?
> 

So far there are only patches to expose it at the xc layer. Nothing else
seems to use the xc_hvm_build() call (only xc_hvm_build_target_mem()).
Since the use of this feature seems dependent on a user's particular
needs, I am not sure how it could generically be built into xl. Any
suggestions are welcome though and I could post subsequent patches.

Thanks
Ross

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