xen/balloon: Seperate the auto-translate logic properly (v2)
authorStefano Stabellini <stefano.stabellini@eu.citrix.com>
Wed, 11 Dec 2013 16:58:42 +0000 (16:58 +0000)
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Fri, 13 Dec 2013 16:20:30 +0000 (11:20 -0500)
commitc1d15f5c8bc1170dafe16e988e55437245966dfe
treebb1c364882addcaa8ac053ed12ae7a501f54a3be
parent380108d891acf8db5cf0d477176c7ed2b62b7928
xen/balloon: Seperate the auto-translate logic properly (v2)

The auto-xlat logic vs the non-xlat means that we don't need to for
auto-xlat guests (like PVH, HVM or ARM):
 - use P2M
 - use scratch page.

However the code in increase_reservation does modify the p2m for
auto_translate guests, but not in decrease_reservation.

Fix that by avoiding any p2m modifications in both increase_reservation
and decrease_reservation for auto_translated guests.

And also avoid allocating or using scratch pages for auto_translated guests.

Lastly, since !auto-xlat is really another way of saying 'xen_pv'
remove the redundant 'xen_pv_domain' check.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
[v2: Updated the description]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
drivers/xen/balloon.c