On Tue, Dec 08, 2020 at 07:45:00AM +0100, Jürgen Groß wrote: > On 07.12.20 21:48, Jason Andryuk wrote: > > On Mon, Dec 7, 2020 at 8:30 AM Juergen Gross <jgr...@suse.com> wrote: > > > > > > Commit 9e2369c06c8a18 ("xen: add helpers to allocate unpopulated > > > memory") introduced usage of ZONE_DEVICE memory for foreign memory > > > mappings. > > > > > > Unfortunately this collides with using page->lru for Xen backend > > > private page caches. > > > > > > Fix that by using page->zone_device_data instead. > > > > > > Fixes: 9e2369c06c8a18 ("xen: add helpers to allocate unpopulated memory") > > > Signed-off-by: Juergen Gross <jgr...@suse.com> > > > > Would it make sense to add BUG_ON(is_zone_device_page(page)) and the > > opposite as appropriate to cache_enq? > > No, I don't think so. At least in the CONFIG_ZONE_DEVICE case the > initial list in a PV dom0 is populated from extra memory (basically > the same, but not marked as zone device memory explicitly).
I assume it's fine for us to then use page->zone_device_data even if the page is not explicitly marked as ZONE_DEVICE memory? If that's fine, add my: Acked-by: Roger Pau Monné <roger....@citrix.com> To both patches, and thank you very much for fixing this! Roger.