Re: [Xen-devel] [PATCH 01/12] xenbus: Support HVM backends

[Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>]

On 12/14/2011 02:03 PM, Konrad Rzeszutek Wilk wrote:
> On Mon, Nov 28, 2011 at 11:49:00AM -0500, Daniel De Graaf wrote:
>> Add HVM implementations of xenbus_(map,unmap)_ring_v(alloc,free) so
>> that ring mappings can be done without using GNTMAP_contains_pte which
>> is not supported on HVM.
> 
> 
> So what else besides these patches should I do to load the blkback/netback
> drivers in a HVM domain? There are some xen toolstack patches patches I 
> presume?
> Can you tell me what the c/s are (if any?)
> 
> Thanks!

No toolstack changes are required for netback; the interface simply shows
up in the guest the same as it does in a PV domain. The same is true for
blkback, but the toolstack does not currently support specifying backend
domains (PV or HVM) for block devices. I posted a patch earlier [1] adding
this support, but the conversion from block device name to major/minor
number is done in the toolstack's domain, not the domain exporting the
block device.

[1] http://lists.xen.org/archives/html/xen-devel/2011-10/threads.html#00818

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