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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
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/*
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* Copyright IBM Corp. 2016
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* Author(s): Martin Schwidefsky <schwidefsky@de.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 <asm/guarded_storage.h>
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#include "entry.h"
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void guarded_storage_release(struct task_struct *tsk)
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{
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kfree(tsk->thread.gs_cb);
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kfree(tsk->thread.gs_bc_cb);
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}
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static int gs_enable(void)
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{
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struct gs_cb *gs_cb;
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if (!current->thread.gs_cb) {
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gs_cb = kzalloc(sizeof(*gs_cb), GFP_KERNEL);
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if (!gs_cb)
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return -ENOMEM;
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gs_cb->gsd = 25;
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preempt_disable();
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__ctl_set_bit(2, 4);
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load_gs_cb(gs_cb);
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current->thread.gs_cb = gs_cb;
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preempt_enable();
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}
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return 0;
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}
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static int gs_disable(void)
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{
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if (current->thread.gs_cb) {
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preempt_disable();
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kfree(current->thread.gs_cb);
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current->thread.gs_cb = NULL;
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__ctl_clear_bit(2, 4);
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preempt_enable();
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}
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return 0;
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}
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static int gs_set_bc_cb(struct gs_cb __user *u_gs_cb)
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{
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struct gs_cb *gs_cb;
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gs_cb = current->thread.gs_bc_cb;
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if (!gs_cb) {
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gs_cb = kzalloc(sizeof(*gs_cb), GFP_KERNEL);
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if (!gs_cb)
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return -ENOMEM;
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current->thread.gs_bc_cb = gs_cb;
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}
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if (copy_from_user(gs_cb, u_gs_cb, sizeof(*gs_cb)))
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return -EFAULT;
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return 0;
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}
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static int gs_clear_bc_cb(void)
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{
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struct gs_cb *gs_cb;
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gs_cb = current->thread.gs_bc_cb;
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current->thread.gs_bc_cb = NULL;
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kfree(gs_cb);
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return 0;
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}
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void gs_load_bc_cb(struct pt_regs *regs)
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{
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struct gs_cb *gs_cb;
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preempt_disable();
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clear_thread_flag(TIF_GUARDED_STORAGE);
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gs_cb = current->thread.gs_bc_cb;
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if (gs_cb) {
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kfree(current->thread.gs_cb);
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current->thread.gs_bc_cb = NULL;
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__ctl_set_bit(2, 4);
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load_gs_cb(gs_cb);
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current->thread.gs_cb = gs_cb;
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}
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preempt_enable();
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}
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static int gs_broadcast(void)
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{
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struct task_struct *sibling;
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read_lock(&tasklist_lock);
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for_each_thread(current, sibling) {
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if (!sibling->thread.gs_bc_cb)
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continue;
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if (test_and_set_tsk_thread_flag(sibling, TIF_GUARDED_STORAGE))
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kick_process(sibling);
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}
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read_unlock(&tasklist_lock);
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return 0;
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}
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SYSCALL_DEFINE2(s390_guarded_storage, int, command,
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struct gs_cb __user *, gs_cb)
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{
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if (!MACHINE_HAS_GS)
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return -EOPNOTSUPP;
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switch (command) {
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case GS_ENABLE:
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return gs_enable();
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case GS_DISABLE:
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return gs_disable();
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case GS_SET_BC_CB:
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return gs_set_bc_cb(gs_cb);
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case GS_CLEAR_BC_CB:
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return gs_clear_bc_cb();
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case GS_BROADCAST:
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return gs_broadcast();
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default:
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return -EINVAL;
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}
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}
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