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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-08-17 22:43:28 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-08-23 16:14:52 +0200 |
| commit | c96aae1f7f393387d160211f60398d58463a7e65 (patch) | |
| tree | d8f41f596cdd974ccca13d146188265096c3bf9e /arch/mips/powertv/memory.c | |
| parent | xen/p2m: Reuse existing P2M leafs if they are filled with 1:1 PFNs or INVALID. (diff) | |
| download | linux-c96aae1f7f393387d160211f60398d58463a7e65.tar.xz linux-c96aae1f7f393387d160211f60398d58463a7e65.zip | |
xen/setup: Fix one-off error when adding for-balloon PFNs to the P2M.
When we are finished with return PFNs to the hypervisor, then
populate it back, and also mark the E820 MMIO and E820 gaps
as IDENTITY_FRAMEs, we then call P2M to set areas that can
be used for ballooning. We were off by one, and ended up
over-writting a P2M entry that most likely was an IDENTITY_FRAME.
For example:
1-1 mapping on 40000->40200
1-1 mapping on bc558->bc5ac
1-1 mapping on bc5b4->bc8c5
1-1 mapping on bc8c6->bcb7c
1-1 mapping on bcd00->100000
Released 614 pages of unused memory
Set 277889 page(s) to 1-1 mapping
Populating 40200-40466 pfn range: 614 pages added
=> here we set from 40466 up to bc559 P2M tree to be
INVALID_P2M_ENTRY. We should have done it up to bc558.
The end result is that if anybody is trying to construct
a PTE for PFN bc558 they end up with ~PAGE_PRESENT.
CC: stable@vger.kernel.org
Reported-by-and-Tested-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/mips/powertv/memory.c')
0 files changed, 0 insertions, 0 deletions