[PV PCI passthrough]: use Xenlight for PV PCI passthrough (but not HVM for now). This makes PV PCI passthrough work properly.
[PV PCI passthrough]: use Xenlight for PV PCI passthrough (but not HVM for now). This makes PV PCI passthrough work properly.

The xenops/ code for PV PCI passthrough is broken. At the very least it's
missing a call to xc_physdev_map_pirq, which itself is missing from the
Xenctrl library.

Since the xenlight PCI passthrough code is genuinely better than the xenops/
code, we should use it rather than fork it.

Note that PV PCI passthrough is still considered experimental, unlike the
HVM PCI passthrough codepath which is heavily used.

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@eu.citrix.com>

salvocambria/xen-api,guard163/xen-api,cheng--zhang/xen-api,cheng-z/xen-api,rafalmiel/xen-api,anoobs/xen-api,huizh/xen-api,rafalmiel/xen-api,srowe/xen-api,Frezzle/xen-api,simonjbeaumont/xen-api,robertbreker/xen-api,Frezzle/xen-api,anoobs/xen-api,koushikcgit/xen-api,srowe/xen-api,huizh/xen-api,vasilenkomike/xen-api,vasilenkomike/xen-api,ravippandey/xen-api,anoobs/xen-api,salvocambria/xen-api,huizh/xen-api,thomassa/xen-api,simonjbeaumont/xen-api,djs55/xen-api,ravippandey/xen-api,djs55/xen-api,rafalmiel/xen-api,cheng-z/xen-api,robertbreker/xen-api,cheng--zhang/xen-api,srowe/xen-api,jjd27/xen-api,euanh/xen-api,euanh/xen-api,guard163/xen-api,ravippandey/xen-api,anoobs/xen-api,thomassa/xen-api,salvocambria/xen-api,thomassa/xen-api,guard163/xen-api,jjd27/xen-api,agimofcarmen/xen-api,euanh/xen-api,euanh/xen-api,thomassa/xen-api,ravippandey/xen-api,koushikcgit/xen-api,guard163/xen-api,cheng--zhang/xen-api,Frezzle/xen-api,simonjbeaumont/xen-api,djs55/xen-api,robertbreker/xen-api,jjd27/xen-api,koushikcgit/xen-api,Frezzle/xen-api,jjd27/xen-api,euanh/xen-api,huizh/xen-api,agimofcarmen/xen-api,salvocambria/xen-api,cheng--zhang/xen-api,cheng--zhang/xen-api,euanh/xen-api,vasilenkomike/xen-api,koushikcgit/xen-api,robertbreker/xen-api,srowe/xen-api,cheng--zhang/xen-api,srowe/xen-api,thomassa/xen-api,cheng-z/xen-api,robertbreker/xen-api,simonjbeaumont/xen-api,cheng-z/xen-api,djs55/xen-api,anoobs/xen-api,koushikcgit/xen-api,anoobs/xen-api,jjd27/xen-api,vasilenkomike/xen-api,simonjbeaumont/xen-api,robertbreker/xen-api,simonjbeaumont/xen-api,salvocambria/xen-api,Frezzle/xen-api,cheng-z/xen-api,huizh/xen-api,cheng-z/xen-api,jjd27/xen-api,djs55/xen-api,vasilenkomike/xen-api,cheng--zhang/xen-api,djs55/xen-api,rafalmiel/xen-api,ravippandey/xen-api,guard163/xen-api,ravippandey/xen-api,agimofcarmen/xen-api,vasilenkomike/xen-api,agimofcarmen/xen-api,koushikcgit/xen-api,salvocambria/xen-api,agimofcarmen/xen-api,cheng-z/xen-api,rafalmiel/xen-api,rafalmiel/xen-api,huizh/xen-api,thomassa/xen-api,guard163/xen-api,agimofcarmen/xen-api