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402b08622d
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> |
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| .. | ||
| asm-offsets.c | ||
| audit.c | ||
| audit.h | ||
| base.S | ||
| binfmt_elf32.c | ||
| bitmap.S | ||
| compat_audit.c | ||
| compat_exec_domain.c | ||
| compat_linux.c | ||
| compat_linux.h | ||
| compat_ptrace.h | ||
| compat_signal.c | ||
| compat_wrapper.S | ||
| cpcmd.c | ||
| crash.c | ||
| debug.c | ||
| diag.c | ||
| dis.c | ||
| early.c | ||
| ebcdic.c | ||
| entry64.S | ||
| entry.h | ||
| entry.S | ||
| head31.S | ||
| head64.S | ||
| head.S | ||
| init_task.c | ||
| ipl.c | ||
| irq.c | ||
| kprobes.c | ||
| machine_kexec.c | ||
| Makefile | ||
| module.c | ||
| process.c | ||
| ptrace.c | ||
| reipl64.S | ||
| reipl.S | ||
| relocate_kernel64.S | ||
| relocate_kernel.S | ||
| s390_ext.c | ||
| s390_ksyms.c | ||
| setup.c | ||
| signal.c | ||
| smp.c | ||
| stacktrace.c | ||
| sys_s390.c | ||
| syscalls.S | ||
| time.c | ||
| topology.c | ||
| traps.c | ||
| vmlinux.lds.S | ||
| vtime.c | ||