linux.git/arch/s390/kernel/syscalls.S, branch v4.12

s390: add a system call for guarded storage

2017-03-22T07:14:25+00:00

This adds a new system call to enable the use of guarded storage for
user space processes. The system call takes two arguments, a command
and pointer to a guarded storage control block:

    s390_guarded_storage(int command, struct gs_cb *gs_cb);

The second argument is relevant only for the GS_SET_BC_CB command.

The commands in detail:

0 - GS_ENABLE
    Enable the guarded storage facility for the current task. The
    initial content of the guarded storage control block will be
    all zeros. After the enablement the user space code can use
    load-guarded-storage-controls instruction (LGSC) to load an
    arbitrary control block. While a task is enabled the kernel
    will save and restore the current content of the guarded
    storage registers on context switch.
1 - GS_DISABLE
    Disables the use of the guarded storage facility for the current
    task. The kernel will cease to save and restore the content of
    the guarded storage registers, the task specific content of
    these registers is lost.
2 - GS_SET_BC_CB
    Set a broadcast guarded storage control block. This is called
    per thread and stores a specific guarded storage control block
    in the task struct of the current task. This control block will
    be used for the broadcast event GS_BROADCAST.
3 - GS_CLEAR_BC_CB
    Clears the broadcast guarded storage control block. The guarded-
    storage control block is removed from the task struct that was
    established by GS_SET_BC_CB.
4 - GS_BROADCAST
    Sends a broadcast to all thread siblings of the current task.
    Every sibling that has established a broadcast guarded storage
    control block will load this control block and will be enabled
    for guarded storage. The broadcast guarded storage control block
    is used up, a second broadcast without a refresh of the stored
    control block with GS_SET_BC_CB will not have any effect.

Signed-off-by: Martin Schwidefsky

s390: wire up statx system call

2017-03-09T23:14:46+00:00

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390: wire up preadv2/pwritev2 syscalls

2016-04-01T06:42:38+00:00

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390: wire up copy_file_range syscall

2016-01-19T11:14:02+00:00

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390: wire up mlock2 system call

2015-11-16T11:51:07+00:00

Passes mlock2-tests test case in 64 bit and compat mode.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390: wire up separate socketcalls system calls

2015-09-18T09:16:53+00:00

As discussed on linux-arch all architectures should wire up the separate
system calls that are hidden behind the socketcall multiplexer system call.

It's just a couple more system calls and gives us a very small performance
improvement.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/compat: remove superfluous compat wrappers

2015-09-18T09:16:52+00:00

A couple of compat wrapper functions are simply trampolines to the real
system call. This happened because the compat wrapper defines will only
sign and zero extend system call parameters which are of different size
on s390/s390x (longs and pointers).
All other parameters will be correctly sign and zero extended by the
normal system call wrappers.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/s390x: allocate sys_membarrier system call number

2015-09-17T11:43:44+00:00

Signed-off-by: Mathieu Desnoyers 
CC: Andrew Morton 
CC: linux-api@vger.kernel.org
CC: Heiko Carstens 
CC: linux-s390@vger.kernel.org
Signed-off-by: Martin Schwidefsky

s390: wire up userfaultfd system call

2015-09-17T11:43:43+00:00

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/numa: add core infrastructure

2015-08-03T16:40:25+00:00

Enable core NUMA support for s390 and add one simple default mode "plain"
that creates one single NUMA node.

This patch contains several changes from Michael Holzheu.

Signed-off-by: Philipp Hachtmann 
Signed-off-by: Michael Holzheu 
Signed-off-by: Martin Schwidefsky