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| author | David Hildenbrand <dahi@linux.vnet.ibm.com> | 2016-04-18 16:22:24 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2016-06-20 09:55:02 +0200 |
| commit | 3218f7094b6b583f4f01bffcf84572c6beacdcc2 (patch) | |
| tree | 4ebcd767692fccf684503c8202c00cc87dba3472 /arch/s390/include | |
| parent | 1c65781b56ce812ce9729bf414201921c9408678 (diff) | |
| download | linux-3218f7094b6b583f4f01bffcf84572c6beacdcc2.tar.gz linux-3218f7094b6b583f4f01bffcf84572c6beacdcc2.tar.xz | |
s390/mm: support real-space for gmap shadows
We can easily support real-space designation just like EDAT1 and EDAT2.
So guest2 can provide for guest3 an asce with the real-space control being
set.
We simply have to allocate the biggest page table possible and fake all
levels.
There is no protection to consider. If we exceed guest memory, vsie code
will inject an addressing exception (via program intercept). In the future,
we could limit the fake table level to the gmap page table.
As the top level page table can never go away, such gmap shadows will never
get unshadowed, we'll have to come up with another way to limit the number
of kept gmap shadows.
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/gmap.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/s390/include/asm/gmap.h b/arch/s390/include/asm/gmap.h index 2e4c3b222a96..752cf47a81ab 100644 --- a/arch/s390/include/asm/gmap.h +++ b/arch/s390/include/asm/gmap.h @@ -109,8 +109,10 @@ int gmap_read_table(struct gmap *gmap, unsigned long gaddr, unsigned long *val); struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce, int edat_level); -int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t); -int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t); +int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t, + int fake); +int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t, + int fake); int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt, int fake); int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt, |