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
...
95 lines
1.9 KiB
C
95 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2012
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* Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/syscalls.h>
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#include <linux/signal.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/kernel_stat.h>
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#include <linux/sched/task_stack.h>
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#include <asm/runtime_instr.h>
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#include <asm/cpu_mf.h>
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#include <asm/irq.h>
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/* empty control block to disable RI by loading it */
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struct runtime_instr_cb runtime_instr_empty_cb;
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void runtime_instr_release(struct task_struct *tsk)
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{
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kfree(tsk->thread.ri_cb);
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}
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static void disable_runtime_instr(void)
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{
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struct task_struct *task = current;
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struct pt_regs *regs;
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if (!task->thread.ri_cb)
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return;
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regs = task_pt_regs(task);
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preempt_disable();
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load_runtime_instr_cb(&runtime_instr_empty_cb);
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kfree(task->thread.ri_cb);
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task->thread.ri_cb = NULL;
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preempt_enable();
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/*
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* Make sure the RI bit is deleted from the PSW. If the user did not
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* switch off RI before the system call the process will get a
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* specification exception otherwise.
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*/
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regs->psw.mask &= ~PSW_MASK_RI;
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}
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static void init_runtime_instr_cb(struct runtime_instr_cb *cb)
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{
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cb->rla = 0xfff;
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cb->s = 1;
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cb->k = 1;
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cb->ps = 1;
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cb->pc = 1;
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cb->key = PAGE_DEFAULT_KEY;
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cb->v = 1;
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}
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SYSCALL_DEFINE1(s390_runtime_instr, int, command)
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{
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struct runtime_instr_cb *cb;
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if (!test_facility(64))
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return -EOPNOTSUPP;
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if (command == S390_RUNTIME_INSTR_STOP) {
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disable_runtime_instr();
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return 0;
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}
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if (command != S390_RUNTIME_INSTR_START)
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return -EINVAL;
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if (!current->thread.ri_cb) {
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cb = kzalloc(sizeof(*cb), GFP_KERNEL);
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if (!cb)
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return -ENOMEM;
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} else {
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cb = current->thread.ri_cb;
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memset(cb, 0, sizeof(*cb));
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}
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init_runtime_instr_cb(cb);
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/* now load the control block to make it available */
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preempt_disable();
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current->thread.ri_cb = cb;
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load_runtime_instr_cb(cb);
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preempt_enable();
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return 0;
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}
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