Carsten Otte 402b08622d s390: KVM preparation: provide hook to enable pgstes in user pagetable ... The SIE instruction on s390 uses the 2nd half of the page table page to virtualize the storage keys of a guest. This patch offers the s390_enable_sie function, which reorganizes the page tables of a single-threaded process to reserve space in the page table: s390_enable_sie makes sure that the process is single threaded and then uses dup_mm to create a new mm with reorganized page tables. The old mm is freed and the process has now a page status extended field after every page table. Code that wants to exploit pgstes should SELECT CONFIG_PGSTE. This patch has a small common code hit, namely making dup_mm non-static. Edit (Carsten): I've modified Martin's patch, following Jeremy Fitzhardinge's review feedback. Now we do have the prototype for dup_mm in include/linux/sched.h. Following Martin's suggestion, s390_enable_sie() does now call task_lock() to prevent race against ptrace modification of mm_users. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Carsten Otte <cotte@de.ibm.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Avi Kivity <avi@qumranet.com>		2008-04-27 12:00:40 +03:00
..
cmm.c
extmem.c	[S390] Remove code duplication from monreader / dcssblk.	2008-04-17 07:47:07 +02:00
fault.c	[S390] Fix a lot of sparse warnings.	2008-04-17 07:47:06 +02:00
init.c
Makefile
mmap.c
pgtable.c	s390: KVM preparation: provide hook to enable pgstes in user pagetable	2008-04-27 12:00:40 +03:00
vmem.c