powerpc: Free up RPAGE_RSV bits
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- v9 Latest8 patches 1 replyIn review
- v17 patches 23 repliesSuperseded
Patches in v9 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/8 | powerpc: introduce pte_set_hidx() helperarch/ arch/ | +39 | 1 reply | |
| 2/8 | powerpc: introduce pte_get_hash_gslot() helperarch/ arch/ | +21 | 0 replies | |
| 3/8 | powerpc: Free up four 64K PTE bits in 4K backed HPTE pagesarch/ arch/ arch/ +2 more | +61 | 0 replies | |
| 4/8 | powerpc: Free up four 64K PTE bits in 64K backed HPTE pagesarch/ arch/ arch/ +2 more | +33 | 0 replies | |
| 5/8 | powerpc: shifted-by-one hidx valuearch/ | +11 | 0 replies | |
| 6/8 | powerpc: Swizzle around 4K PTE bits to free up bit 5 and bit 6arch/ arch/ arch/ | +5 | 0 replies | |
| 7/8 | powerpc: use helper functions to get and set hash slotsarch/ arch/ | +10 | 0 replies | |
| 8/8 | powerpc: capture the PTE format changes in the dump pte reportarch/ | +2 | 0 replies |
Reviews trailers per patch
6 of 8 patches have a Reviewed-by or Acked-by.
| Patch | Balbir Singh | Aneesh Kumar K.V |
|---|---|---|
| 1/8 | A-b | R-b |
| 2/8 | R-b | |
| 3/8 | A-b | R-b |
| 4/8 | R-b | |
| 5/8 | ||
| 6/8 | ||
| 7/8 | R-b | |
| 8/8 | R-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH v9 0/8] powerpc: Free up RPAGE_RSV bits
RPAGE_RSV0..4 PTE bits are currently used for HPTE slot tracking. We need these bits for memory-protection keys. Luckily these four bits are relatively easier to move among all the other candidate bits.
For 64K linux-PTEs backed by 4k HPTEs, these bits are used for tracking the validity of the slot value stored in the second-part-of-the-PTE. We device a new mechanism for tracking the validity without using those bits. The mechanism is explained in the first patch.
For 64K linux-PTE backed by 64K HPTEs, we simply move the slot tracking bits to the second-part-of-the-PTE.
The above mechanism is also used to free the bits for hugetlb linux-PTEs.
For 4k linux-PTE, we have only 3 free bits available. We swizzle around the bits and release RPAGE_RSV{2,3,4} for memory protection keys.
Testing:
--------
has survived kernel compilation on multiple platforms p8 powernv hash-mode, p9 powernv hash-mode, p7 powervm, p8-powervm, p8-kvm-guest.
History:
-------
This patchset is a spin-off from the memkey patchset.
version v10:
(1) hidx value is rotated by one to save initialization of the secondary-PTE.
(2) comments are not anymore right justified. -- comment by mpe
version v9:
(1) rearranged the patch order. First the helper routines are defined followed by the patches that make use of the helpers.
version v8:
(1) an additional patch added to free up
RSV{2,3,4} on 4K linux-PTE.version v7:
(1) GIX bit reset change moved to the second patch -- noticed by Aneesh.
(2) Separated this patches from memkey patchset
(3) merged a bunch of patches, that used the helper function, into one.
version v6:
(1) No changes related to PTE.
version v5:
(1) No changes related to PTE.
version v4:
(1) No changes related to PTE.
version v3:
(1) split the patches into smaller consumable patches.
(2) A bug fix while invalidating a HPTE slot in __hash_page_4K()
-- noticed by Aneesh
version v2:
(1) fixed a bug in 4k HPTE backed 64k PTE where page invalidation was not done correctly, and initialization of second-part-of-the-PTE was not done correctly if the PTE was not yet Hashed with a HPTE.
-- Reported by Aneesh.
version v1: Initial version
Ram Pai (8):
powerpc: introduce pte_set_hidx() helper
powerpc: introduce pte_get_hash_gslot() helper
powerpc: Free up four 64K PTE bits in 4K backed HPTE pages
powerpc: Free up four 64K PTE bits in 64K backed HPTE pages
powerpc: shifted-by-one hidx value
powerpc: Swizzle around 4K PTE bits to free up bit 5 and bit 6
powerpc: use helper functions to get and set hash slots
powerpc: capture the PTE format changes in the dump pte report
arch/powerpc/include/asm/book3s/64/hash-4k.h | 20 ++++ arch/powerpc/include/asm/book3s/64/hash-64k.h | 71 ++++++++++---- arch/powerpc/include/asm/book3s/64/hash.h | 8 +- arch/powerpc/mm/dump_linuxpagetables.c | 3 +- arch/powerpc/mm/hash64_4k.c | 14 +-- arch/powerpc/mm/hash64_64k.c | 123 +++++++++++++------------ arch/powerpc/mm/hash_utils_64.c | 35 +++++-- arch/powerpc/mm/hugetlbpage-hash64.c | 16 +-- 8 files changed, 175 insertions(+), 115 deletions(-)