mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 18:24:14 +08:00
d60a540ac5
Pull s390 updates from Heiko Carstens:
"Since Martin is on vacation you get the s390 pull request for the
v4.15 merge window this time from me.
Besides a lot of cleanups and bug fixes these are the most important
changes:
- a new regset for runtime instrumentation registers
- hardware accelerated AES-GCM support for the aes_s390 module
- support for the new CEX6S crypto cards
- support for FORTIFY_SOURCE
- addition of missing z13 and new z14 instructions to the in-kernel
disassembler
- generate opcode tables for the in-kernel disassembler out of a
simple text file instead of having to manually maintain those
tables
- fast memset16, memset32 and memset64 implementations
- removal of named saved segment support
- hardware counter support for z14
- queued spinlocks and queued rwlocks implementations for s390
- use the stack_depth tracking feature for s390 BPF JIT
- a new s390_sthyi system call which emulates the sthyi (store
hypervisor information) instruction
- removal of the old KVM virtio transport
- an s390 specific CPU alternatives implementation which is used in
the new spinlock code"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (88 commits)
MAINTAINERS: add virtio-ccw.h to virtio/s390 section
s390/noexec: execute kexec datamover without DAT
s390: fix transactional execution control register handling
s390/bpf: take advantage of stack_depth tracking
s390: simplify transactional execution elf hwcap handling
s390/zcrypt: Rework struct ap_qact_ap_info.
s390/virtio: remove unused header file kvm_virtio.h
s390: avoid undefined behaviour
s390/disassembler: generate opcode tables from text file
s390/disassembler: remove insn_to_mnemonic()
s390/dasd: avoid calling do_gettimeofday()
s390: vfio-ccw: Do not attempt to free no-op, test and tic cda.
s390: remove named saved segment support
s390/archrandom: Reconsider s390 arch random implementation
s390/pci: do not require AIS facility
s390/qdio: sanitize put_indicator
s390/qdio: use atomic_cmpxchg
s390/nmi: avoid using long-displacement facility
s390: pass endianness info to sparse
s390/decompressor: remove informational messages
...
129 lines
2.4 KiB
C
129 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright IBM Corp. 2016
|
|
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/guarded_storage.h>
|
|
#include "entry.h"
|
|
|
|
void guarded_storage_release(struct task_struct *tsk)
|
|
{
|
|
kfree(tsk->thread.gs_cb);
|
|
kfree(tsk->thread.gs_bc_cb);
|
|
}
|
|
|
|
static int gs_enable(void)
|
|
{
|
|
struct gs_cb *gs_cb;
|
|
|
|
if (!current->thread.gs_cb) {
|
|
gs_cb = kzalloc(sizeof(*gs_cb), GFP_KERNEL);
|
|
if (!gs_cb)
|
|
return -ENOMEM;
|
|
gs_cb->gsd = 25;
|
|
preempt_disable();
|
|
__ctl_set_bit(2, 4);
|
|
load_gs_cb(gs_cb);
|
|
current->thread.gs_cb = gs_cb;
|
|
preempt_enable();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int gs_disable(void)
|
|
{
|
|
if (current->thread.gs_cb) {
|
|
preempt_disable();
|
|
kfree(current->thread.gs_cb);
|
|
current->thread.gs_cb = NULL;
|
|
__ctl_clear_bit(2, 4);
|
|
preempt_enable();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int gs_set_bc_cb(struct gs_cb __user *u_gs_cb)
|
|
{
|
|
struct gs_cb *gs_cb;
|
|
|
|
gs_cb = current->thread.gs_bc_cb;
|
|
if (!gs_cb) {
|
|
gs_cb = kzalloc(sizeof(*gs_cb), GFP_KERNEL);
|
|
if (!gs_cb)
|
|
return -ENOMEM;
|
|
current->thread.gs_bc_cb = gs_cb;
|
|
}
|
|
if (copy_from_user(gs_cb, u_gs_cb, sizeof(*gs_cb)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int gs_clear_bc_cb(void)
|
|
{
|
|
struct gs_cb *gs_cb;
|
|
|
|
gs_cb = current->thread.gs_bc_cb;
|
|
current->thread.gs_bc_cb = NULL;
|
|
kfree(gs_cb);
|
|
return 0;
|
|
}
|
|
|
|
void gs_load_bc_cb(struct pt_regs *regs)
|
|
{
|
|
struct gs_cb *gs_cb;
|
|
|
|
preempt_disable();
|
|
clear_thread_flag(TIF_GUARDED_STORAGE);
|
|
gs_cb = current->thread.gs_bc_cb;
|
|
if (gs_cb) {
|
|
kfree(current->thread.gs_cb);
|
|
current->thread.gs_bc_cb = NULL;
|
|
__ctl_set_bit(2, 4);
|
|
load_gs_cb(gs_cb);
|
|
current->thread.gs_cb = gs_cb;
|
|
}
|
|
preempt_enable();
|
|
}
|
|
|
|
static int gs_broadcast(void)
|
|
{
|
|
struct task_struct *sibling;
|
|
|
|
read_lock(&tasklist_lock);
|
|
for_each_thread(current, sibling) {
|
|
if (!sibling->thread.gs_bc_cb)
|
|
continue;
|
|
if (test_and_set_tsk_thread_flag(sibling, TIF_GUARDED_STORAGE))
|
|
kick_process(sibling);
|
|
}
|
|
read_unlock(&tasklist_lock);
|
|
return 0;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(s390_guarded_storage, int, command,
|
|
struct gs_cb __user *, gs_cb)
|
|
{
|
|
if (!MACHINE_HAS_GS)
|
|
return -EOPNOTSUPP;
|
|
switch (command) {
|
|
case GS_ENABLE:
|
|
return gs_enable();
|
|
case GS_DISABLE:
|
|
return gs_disable();
|
|
case GS_SET_BC_CB:
|
|
return gs_set_bc_cb(gs_cb);
|
|
case GS_CLEAR_BC_CB:
|
|
return gs_clear_bc_cb();
|
|
case GS_BROADCAST:
|
|
return gs_broadcast();
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|