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author | Zoltan Kiss <zoltan.kiss@citrix.com> | 2014-01-23 21:23:44 +0000 |
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committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2014-01-31 09:48:32 -0500 |
commit | 08ece5bb2312b4510b161a6ef6682f37f4eac8a1 (patch) | |
tree | d331f6b82ca8f0346afdf54bc793fb10c4bdaec8 /drivers/xen/xen-selfballoon.c | |
parent | 47c542050d306e50f09512eb6339dbf2fc02fddd (diff) | |
download | linux-08ece5bb2312b4510b161a6ef6682f37f4eac8a1.tar.gz linux-08ece5bb2312b4510b161a6ef6682f37f4eac8a1.tar.bz2 linux-08ece5bb2312b4510b161a6ef6682f37f4eac8a1.zip |
xen/grant-table: Avoid m2p_override during mapping
The grant mapping API does m2p_override unnecessarily: only gntdev needs it,
for blkback and future netback patches it just cause a lock contention, as
those pages never go to userspace. Therefore this series does the following:
- the original functions were renamed to __gnttab_[un]map_refs, with a new
parameter m2p_override
- based on m2p_override either they follow the original behaviour, or just set
the private flag and call set_phys_to_machine
- gnttab_[un]map_refs are now a wrapper to call __gnttab_[un]map_refs with
m2p_override false
- a new function gnttab_[un]map_refs_userspace provides the old behaviour
It also removes a stray space from page.h and change ret to 0 if
XENFEAT_auto_translated_physmap, as that is the only possible return value
there.
v2:
- move the storing of the old mfn in page->index to gnttab_map_refs
- move the function header update to a separate patch
v3:
- a new approach to retain old behaviour where it needed
- squash the patches into one
v4:
- move out the common bits from m2p* functions, and pass pfn/mfn as parameter
- clear page->private before doing anything with the page, so m2p_find_override
won't race with this
v5:
- change return value handling in __gnttab_[un]map_refs
- remove a stray space in page.h
- add detail why ret = 0 now at some places
v6:
- don't pass pfn to m2p* functions, just get it locally
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Suggested-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen/xen-selfballoon.c')
0 files changed, 0 insertions, 0 deletions