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| author |   Janosch Frank <frankja@linux.ibm.com> | 2018-07-13 11:28:21 +0100 |
|---|---|---|
| committer | Janosch Frank <frankja@linux.ibm.com> | 2018-07-30 11:20:17 +0100 |
| commit | 7c4b13a7c042fd6b71dc48d291208f8a97fad333 (patch) | |
| tree | eb4870d99b682bcebbcc8de5bd29cae061381912 /arch/s390/include/asm/gmap.h | |
| parent | s390/mm: Add gmap pmd linking (diff) | |
| download | linux-dev-7c4b13a7c042fd6b71dc48d291208f8a97fad333.tar.xz linux-dev-7c4b13a7c042fd6b71dc48d291208f8a97fad333.zip | |
s390/mm: Add gmap pmd notification bit setting
Like for ptes, we also need invalidation notification for pmds, to
make sure the guest lowcore pages are always accessible and later
addition of shadowed pmds.
With PMDs we do not have PGSTEs or some other bits we could use in the
host PMD. Instead we pick one of the free bits in the gmap PMD. Every
time a host pmd will be invalidated, we will check if the respective
gmap PMD has the bit set and in that case fire up the notifier.
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/gmap.h')
| -rw-r--r-- | arch/s390/include/asm/gmap.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/include/asm/gmap.h b/arch/s390/include/asm/gmap.h index c1bc5633fc6e..276268b48aff 100644 --- a/arch/s390/include/asm/gmap.h +++ b/arch/s390/include/asm/gmap.h @@ -13,6 +13,9 @@ #define GMAP_NOTIFY_SHADOW 0x2 #define GMAP_NOTIFY_MPROT 0x1 +/* Status bits only for huge segment entries */ +#define _SEGMENT_ENTRY_GMAP_IN 0x8000 /* invalidation notify bit */ + /** * struct gmap_struct - guest address space * @list: list head for the mm->context gmap list |