Re: [Xen-devel] [PATCH RFC 0/4] Allow qemu to provide emulated disks for devices with hotplug scripts

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Mar 02, 2016 at 11:14:00AM +0000, George Dunlap wrote:
> Qemu in dom0 can only provide emulated disks when the qemu process has
> access to an image of the file.  At the moment, this only includes
> plain files or physical devices in dom0; it does not include anything
> to do with a hotplug script.
> 
> However, hotplug scripts run from dom0 generally do, as a necessary
> side effect of their activity, create a block device which could be
> passed to domain 0; this block device can be passed to a qemu device
> running in dom0 to provide emulated disk support.
> 
> This series allows qemu to gain access to that block device, giving it
> full parity with PV guests for all disks whose backend is in domain 0.
> 
> It also takes steps towards generalizing the "local attach"
> funcitonality which is used by pygrub to access non-local disks, so
> that in the future qemu can access emulated disks by attaching them to
> dom0.
> 
> RFC because I haven't tested it since forward-porting it.
> 

I haven't looked at this series, but I expect another posting on top of
Ian Jackson's hotplug script interface patch.

If you want me to look at this series, please let me know.

Wei.


> 
> George Dunlap (4):
>   libxl: Move check for local access to a funciton
>   libxl: Share logic for finding path between qemuu and pygrub
>   tools/hotplug: Add a "dummy" hotplug script for testing
>   libxl: Allow local access for block devices with hotplug scripts
> 
>  tools/hotplug/Linux/Makefile        |   1 +
>  tools/hotplug/Linux/block-common.sh |   5 +-
>  tools/hotplug/Linux/block-dummy     | 107 +++++++++++++++++++++++++++++++++
>  tools/libxl/libxl.c                 | 115 
> +++++++++++++++++++++++++++++-------
>  tools/libxl/libxl_bootloader.c      |   1 +
>  tools/libxl/libxl_dm.c              |  66 ++++++++++++++-------
>  tools/libxl/libxl_internal.h        |  12 +++-
>  7 files changed, 262 insertions(+), 45 deletions(-)
>  create mode 100644 tools/hotplug/Linux/block-dummy
> 
> -- 
> 2.1.4
> 
> 
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