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As part of the cleanup of some remaining y2038 issues, I came to fs/compat_ioctl.c, which still has a couple of commands that need support for time64_t. In completely unrelated work, I spent time on cleaning up parts of this file in the past, moving things out into drivers instead. After Al Viro reviewed an earlier version of this series and did a lot more of that cleanup, I decided to try to completely eliminate the rest of it and move it all into drivers. This series incorporates some of Al's work and many patches of my own, but in the end stops short of actually removing the last part, which is the scsi ioctl handlers. I have patches for those as well, but they need more testing or possibly a rewrite. Signed-off-by: Arnd Bergmann <arnd@arndb.de> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABCAAGBQJdsHCdAAoJEJpsee/mABjZtYkP/1JGl3jFv3Iq/5BCdPkaePP1 RtMJRNfURgK3GeuHUui330PvVjI/pLWXU/VXMK2MPTASpJLzYz3uCaZrpVWEMpDZ +ImzGmgJkITlW1uWU3zOcQhOxTyb1hCZ0Ci+2xn9QAmyOL7prXoXCXDWv3h6iyiF lwG+nW+HNtyx41YG+9bRfKNoG0ZJ+nkJ70BV6u0acQHXWn7Xuupa9YUmBL87hxAL 6dlJfLTJg6q8QSv/Q6LxslfWk2Ti8OOJZOwtFM5R8Bgl0iUcvshiRCKfv/3t9jXD dJNvF1uq8z+gracWK49Qsfq5dnZ2ZxHFUo9u0NjbCrxNvWH/sdvhbaUBuJI75seH VIznCkdxFhrqitJJ8KmxANxG08u+9zSKjSlxG2SmlA4qFx/AoStoHwQXcogJscNb YIXYKmWBvwPzYu09QFAXdHFPmZvp/3HhMWU6o92lvDhsDwzkSGt3XKhCJea4DCaT m+oCcoACqSWhMwdbJOEFofSub4bY43s5iaYuKes+c8O261/Dwg6v/pgIVez9mxXm TBnvCsotq5m8wbwzv99eFqGeJH8zpDHrXxEtRR5KQqMqjLq/OQVaEzmpHZTEuK7n e/V/PAKo2/V63g4k6GApQXDxnjwT+m0aWToWoeEzPYXS6KmtWC91r4bWtslu3rdl bN65armTm7bFFR32Avnu =lgCl -----END PGP SIGNATURE----- Merge tag 'compat-ioctl-5.5' of git://git.kernel.org:/pub/scm/linux/kernel/git/arnd/playground Pull removal of most of fs/compat_ioctl.c from Arnd Bergmann: "As part of the cleanup of some remaining y2038 issues, I came to fs/compat_ioctl.c, which still has a couple of commands that need support for time64_t. In completely unrelated work, I spent time on cleaning up parts of this file in the past, moving things out into drivers instead. After Al Viro reviewed an earlier version of this series and did a lot more of that cleanup, I decided to try to completely eliminate the rest of it and move it all into drivers. This series incorporates some of Al's work and many patches of my own, but in the end stops short of actually removing the last part, which is the scsi ioctl handlers. I have patches for those as well, but they need more testing or possibly a rewrite" * tag 'compat-ioctl-5.5' of git://git.kernel.org:/pub/scm/linux/kernel/git/arnd/playground: (42 commits) scsi: sd: enable compat ioctls for sed-opal pktcdvd: add compat_ioctl handler compat_ioctl: move SG_GET_REQUEST_TABLE handling compat_ioctl: ppp: move simple commands into ppp_generic.c compat_ioctl: handle PPPIOCGIDLE for 64-bit time_t compat_ioctl: move PPPIOCSCOMPRESS to ppp_generic compat_ioctl: unify copy-in of ppp filters tty: handle compat PPP ioctls compat_ioctl: move SIOCOUTQ out of compat_ioctl.c compat_ioctl: handle SIOCOUTQNSD af_unix: add compat_ioctl support compat_ioctl: reimplement SG_IO handling compat_ioctl: move WDIOC handling into wdt drivers fs: compat_ioctl: move FITRIM emulation into file systems gfs2: add compat_ioctl support compat_ioctl: remove unused convert_in_user macro compat_ioctl: remove last RAID handling code compat_ioctl: remove /dev/raw ioctl translation compat_ioctl: remove PCI ioctl translation compat_ioctl: remove joystick ioctl translation ...
326 lines
7.3 KiB
C
326 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (C) 2009 Red Hat, Inc.
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* Author: Michael S. Tsirkin <mst@redhat.com>
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*
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* test virtio server in host kernel.
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*/
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#include <linux/compat.h>
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#include <linux/eventfd.h>
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#include <linux/vhost.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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#include <linux/file.h>
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#include <linux/slab.h>
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#include "test.h"
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#include "vhost.h"
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/* Max number of bytes transferred before requeueing the job.
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* Using this limit prevents one virtqueue from starving others. */
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#define VHOST_TEST_WEIGHT 0x80000
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/* Max number of packets transferred before requeueing the job.
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* Using this limit prevents one virtqueue from starving others with
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* pkts.
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*/
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#define VHOST_TEST_PKT_WEIGHT 256
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enum {
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VHOST_TEST_VQ = 0,
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VHOST_TEST_VQ_MAX = 1,
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};
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struct vhost_test {
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struct vhost_dev dev;
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struct vhost_virtqueue vqs[VHOST_TEST_VQ_MAX];
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};
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/* Expects to be always run from workqueue - which acts as
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* read-size critical section for our kind of RCU. */
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static void handle_vq(struct vhost_test *n)
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{
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struct vhost_virtqueue *vq = &n->vqs[VHOST_TEST_VQ];
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unsigned out, in;
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int head;
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size_t len, total_len = 0;
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void *private;
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mutex_lock(&vq->mutex);
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private = vq->private_data;
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if (!private) {
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mutex_unlock(&vq->mutex);
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return;
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}
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vhost_disable_notify(&n->dev, vq);
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for (;;) {
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head = vhost_get_vq_desc(vq, vq->iov,
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ARRAY_SIZE(vq->iov),
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&out, &in,
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NULL, NULL);
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/* On error, stop handling until the next kick. */
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if (unlikely(head < 0))
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break;
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/* Nothing new? Wait for eventfd to tell us they refilled. */
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if (head == vq->num) {
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if (unlikely(vhost_enable_notify(&n->dev, vq))) {
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vhost_disable_notify(&n->dev, vq);
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continue;
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}
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break;
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}
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if (in) {
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vq_err(vq, "Unexpected descriptor format for TX: "
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"out %d, int %d\n", out, in);
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break;
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}
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len = iov_length(vq->iov, out);
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/* Sanity check */
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if (!len) {
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vq_err(vq, "Unexpected 0 len for TX\n");
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break;
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}
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vhost_add_used_and_signal(&n->dev, vq, head, 0);
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total_len += len;
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if (unlikely(vhost_exceeds_weight(vq, 0, total_len)))
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break;
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}
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mutex_unlock(&vq->mutex);
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}
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static void handle_vq_kick(struct vhost_work *work)
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{
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struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
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poll.work);
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struct vhost_test *n = container_of(vq->dev, struct vhost_test, dev);
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handle_vq(n);
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}
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static int vhost_test_open(struct inode *inode, struct file *f)
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{
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struct vhost_test *n = kmalloc(sizeof *n, GFP_KERNEL);
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struct vhost_dev *dev;
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struct vhost_virtqueue **vqs;
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if (!n)
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return -ENOMEM;
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vqs = kmalloc_array(VHOST_TEST_VQ_MAX, sizeof(*vqs), GFP_KERNEL);
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if (!vqs) {
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kfree(n);
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return -ENOMEM;
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}
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dev = &n->dev;
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vqs[VHOST_TEST_VQ] = &n->vqs[VHOST_TEST_VQ];
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n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick;
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vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX, UIO_MAXIOV,
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VHOST_TEST_PKT_WEIGHT, VHOST_TEST_WEIGHT);
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f->private_data = n;
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return 0;
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}
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static void *vhost_test_stop_vq(struct vhost_test *n,
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struct vhost_virtqueue *vq)
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{
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void *private;
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mutex_lock(&vq->mutex);
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private = vq->private_data;
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vq->private_data = NULL;
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mutex_unlock(&vq->mutex);
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return private;
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}
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static void vhost_test_stop(struct vhost_test *n, void **privatep)
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{
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*privatep = vhost_test_stop_vq(n, n->vqs + VHOST_TEST_VQ);
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}
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static void vhost_test_flush_vq(struct vhost_test *n, int index)
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{
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vhost_poll_flush(&n->vqs[index].poll);
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}
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static void vhost_test_flush(struct vhost_test *n)
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{
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vhost_test_flush_vq(n, VHOST_TEST_VQ);
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}
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static int vhost_test_release(struct inode *inode, struct file *f)
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{
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struct vhost_test *n = f->private_data;
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void *private;
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vhost_test_stop(n, &private);
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vhost_test_flush(n);
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vhost_dev_stop(&n->dev);
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vhost_dev_cleanup(&n->dev);
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/* We do an extra flush before freeing memory,
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* since jobs can re-queue themselves. */
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vhost_test_flush(n);
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kfree(n);
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return 0;
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}
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static long vhost_test_run(struct vhost_test *n, int test)
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{
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void *priv, *oldpriv;
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struct vhost_virtqueue *vq;
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int r, index;
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if (test < 0 || test > 1)
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return -EINVAL;
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mutex_lock(&n->dev.mutex);
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r = vhost_dev_check_owner(&n->dev);
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if (r)
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goto err;
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for (index = 0; index < n->dev.nvqs; ++index) {
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/* Verify that ring has been setup correctly. */
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if (!vhost_vq_access_ok(&n->vqs[index])) {
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r = -EFAULT;
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goto err;
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}
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}
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for (index = 0; index < n->dev.nvqs; ++index) {
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vq = n->vqs + index;
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mutex_lock(&vq->mutex);
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priv = test ? n : NULL;
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/* start polling new socket */
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oldpriv = vq->private_data;
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vq->private_data = priv;
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r = vhost_vq_init_access(&n->vqs[index]);
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mutex_unlock(&vq->mutex);
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if (r)
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goto err;
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if (oldpriv) {
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vhost_test_flush_vq(n, index);
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}
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}
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mutex_unlock(&n->dev.mutex);
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return 0;
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err:
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mutex_unlock(&n->dev.mutex);
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return r;
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}
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static long vhost_test_reset_owner(struct vhost_test *n)
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{
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void *priv = NULL;
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long err;
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struct vhost_umem *umem;
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mutex_lock(&n->dev.mutex);
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err = vhost_dev_check_owner(&n->dev);
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if (err)
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goto done;
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umem = vhost_dev_reset_owner_prepare();
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if (!umem) {
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err = -ENOMEM;
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goto done;
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}
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vhost_test_stop(n, &priv);
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vhost_test_flush(n);
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vhost_dev_stop(&n->dev);
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vhost_dev_reset_owner(&n->dev, umem);
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done:
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mutex_unlock(&n->dev.mutex);
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return err;
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}
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static int vhost_test_set_features(struct vhost_test *n, u64 features)
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{
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struct vhost_virtqueue *vq;
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mutex_lock(&n->dev.mutex);
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if ((features & (1 << VHOST_F_LOG_ALL)) &&
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!vhost_log_access_ok(&n->dev)) {
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mutex_unlock(&n->dev.mutex);
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return -EFAULT;
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}
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vq = &n->vqs[VHOST_TEST_VQ];
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mutex_lock(&vq->mutex);
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vq->acked_features = features;
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mutex_unlock(&vq->mutex);
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mutex_unlock(&n->dev.mutex);
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return 0;
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}
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static long vhost_test_ioctl(struct file *f, unsigned int ioctl,
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unsigned long arg)
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{
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struct vhost_test *n = f->private_data;
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void __user *argp = (void __user *)arg;
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u64 __user *featurep = argp;
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int test;
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u64 features;
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int r;
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switch (ioctl) {
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case VHOST_TEST_RUN:
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if (copy_from_user(&test, argp, sizeof test))
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return -EFAULT;
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return vhost_test_run(n, test);
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case VHOST_GET_FEATURES:
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features = VHOST_FEATURES;
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if (copy_to_user(featurep, &features, sizeof features))
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return -EFAULT;
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return 0;
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case VHOST_SET_FEATURES:
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printk(KERN_ERR "1\n");
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if (copy_from_user(&features, featurep, sizeof features))
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return -EFAULT;
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printk(KERN_ERR "2\n");
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if (features & ~VHOST_FEATURES)
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return -EOPNOTSUPP;
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printk(KERN_ERR "3\n");
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return vhost_test_set_features(n, features);
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case VHOST_RESET_OWNER:
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return vhost_test_reset_owner(n);
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default:
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mutex_lock(&n->dev.mutex);
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r = vhost_dev_ioctl(&n->dev, ioctl, argp);
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if (r == -ENOIOCTLCMD)
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r = vhost_vring_ioctl(&n->dev, ioctl, argp);
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vhost_test_flush(n);
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mutex_unlock(&n->dev.mutex);
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return r;
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}
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}
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static const struct file_operations vhost_test_fops = {
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.owner = THIS_MODULE,
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.release = vhost_test_release,
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.unlocked_ioctl = vhost_test_ioctl,
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.compat_ioctl = compat_ptr_ioctl,
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.open = vhost_test_open,
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.llseek = noop_llseek,
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};
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static struct miscdevice vhost_test_misc = {
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MISC_DYNAMIC_MINOR,
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"vhost-test",
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&vhost_test_fops,
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};
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module_misc_device(vhost_test_misc);
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MODULE_VERSION("0.0.1");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Michael S. Tsirkin");
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MODULE_DESCRIPTION("Host kernel side for virtio simulator");
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