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bf4afc53b7
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
129 lines
2.5 KiB
C
129 lines
2.5 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/cpufeature.h>
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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_obj(*gs_cb);
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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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local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
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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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local_ctl_clear_bit(2, CR2_GUARDED_STORAGE_BIT);
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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_obj(*gs_cb);
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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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local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
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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 (!cpu_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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