Re: [Xen-devel] [PATCH 00/10] Xenstore communication support for Seabios

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Aug 19, 2011 at 01:03:17AM +0900, Daniel Castro wrote:
> As part of Google Summer of Code we are in the process to add Block 
> PV-drivers to
> Seabios, in order to this, first we have to be able to communicate with 
> xenstore
> so we can exchange information before the front and back ends connect. To 
> communicate
> with xenstore we need to make seabios Xen-friendly so support for hypercalls 
> has been
> added to Seabios. In the next month, Seabios will become a front-end for the 
> block devices,
> connecting to dom0 back-end block device when used with Xen.
> 
> There is an issue, if you issue a query and the ring did not prepare the 
> answer
> fast enough, after the event signal hypercall, the ring will force a ring 
> wait for
> an event that will never arrive. For now this is solved by doing a dprintf 
> after the
> hypercall, this gives enough time to the ring.
> 
> This patch should be applied to Seabios and must be used with qemu-upstream 
> with 
> xen4.1, please follow this guide for this:
> http://wiki.xensource.com/xenwiki/QEMUUpstream

Cool. From me glancing at it looks pretty clean (well, the addition of the
different hypercalls could be squashed in one). You should probably
CC the SeaBIOS folks and QEMU devel mailing list on the next re-post.

> 
> Some more documentation on this can be found here:
> http://wiki.xensource.com/xenwiki/SeaBIOS
> 
> Daniel Castro (10):
>   Xen: Guest Handlers and Copyrights
>   Move PAGE_SHIFT to memmap.h
>   Xen: Use PAGE_SHIFT as a constant
>   Xen: Support for interdomain event channel
>   Xen: Support for HVM_op Hypercall
>   Xen: Support for memory_op Hypercall
>   Xen: Support for sched_op hypercall
>   Xen: Shared info for CPU yield support and xenbus protocol
>   Xen: Xenstore communication via xenbus
>   Xen: Xenstore example -do not apply
> 
>  Makefile          |    2 +-
>  src/bitops.h      |   14 ++
>  src/memmap.h      |    2 +
>  src/post.c        |    2 +
>  src/virtio-ring.h |    2 +-
>  src/xen-xs.c      |  251 +++++++++++++++++++++++++++++++++++++
>  src/xen-xs.h      |    9 ++
>  src/xen.c         |   20 +++-
>  src/xen.h         |  357 
> ++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  9 files changed, 653 insertions(+), 6 deletions(-)
>  create mode 100644 src/bitops.h
>  create mode 100644 src/xen-xs.c
>  create mode 100644 src/xen-xs.h
> 
> -- 
> 1.7.4.1
> 
> 
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> http://lists.xensource.com/xen-devel

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