From 402b08622d9ac6e32e25289573272e0f21bb58a7 Mon Sep 17 00:00:00 2001 From: Carsten Otte Date: Tue, 25 Mar 2008 18:47:10 +0100 Subject: 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 Signed-off-by: Carsten Otte Acked-by: Andrew Morton Signed-off-by: Avi Kivity --- kernel/fork.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'kernel/fork.c') diff --git a/kernel/fork.c b/kernel/fork.c index cb46befdd3a0..c674aa8d3c31 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -521,7 +521,7 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm) * Allocate a new mm structure and copy contents from the * mm structure of the passed in task structure. */ -static struct mm_struct *dup_mm(struct task_struct *tsk) +struct mm_struct *dup_mm(struct task_struct *tsk) { struct mm_struct *mm, *oldmm = current->mm; int err; -- cgit v1.2.2