I added ahci disk support in libxl and using it for week seems that was ok, after a reply of Stefano Stabellini seems that xen disk unplug support only ide disks:
http://git.qemu.org/?p=qemu.git;a=commitdiff;h=679f4f8b178e7c66fbc2f39c905374ee8663d5d8
Today Paul Durrant told me that even if pv disk is ok also with ahci and the emulated one is offline can be a risk:
http://lists.xenproject.org/archives/html/win-pv-devel/2015-10/msg00021.html

I tried to take a fast look in qemu code but I not understand the needed thing for add the xen disk unplug support also for ahci, can someone do it or tell me useful information for do it please?

Thanks for any reply and sorry for my bad english.

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