e6383293eb
vhost_kernel_reset_device() invokes RESET_OWNER, which disassociates the owner process from the device. The device is left non-operational since SET_OWNER is only called once during startup in vhost_dev_init(). vhost_kernel_reset_device() is never called so this latent bug never appears. Get rid of vhost_kernel_reset_device() for now. If someone needs it in the future they'll need to implement it correctly. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <20231004014532.1228637-3-stefanha@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
405 lines
12 KiB
C
405 lines
12 KiB
C
/*
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* vhost-backend
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*
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* Copyright (c) 2013 Virtual Open Systems Sarl.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "hw/virtio/vhost.h"
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#include "hw/virtio/vhost-backend.h"
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#include "qemu/error-report.h"
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#include "qemu/main-loop.h"
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#include "standard-headers/linux/vhost_types.h"
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#include "hw/virtio/vhost-vdpa.h"
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#ifdef CONFIG_VHOST_KERNEL
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#include <linux/vhost.h>
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#include <sys/ioctl.h>
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static int vhost_kernel_call(struct vhost_dev *dev, unsigned long int request,
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void *arg)
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{
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int fd = (uintptr_t) dev->opaque;
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int ret;
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assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL);
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ret = ioctl(fd, request, arg);
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return ret < 0 ? -errno : ret;
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}
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static int vhost_kernel_init(struct vhost_dev *dev, void *opaque, Error **errp)
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{
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assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL);
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dev->opaque = opaque;
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return 0;
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}
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static int vhost_kernel_cleanup(struct vhost_dev *dev)
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{
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int fd = (uintptr_t) dev->opaque;
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assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL);
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return close(fd) < 0 ? -errno : 0;
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}
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static int vhost_kernel_memslots_limit(struct vhost_dev *dev)
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{
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int limit = 64;
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char *s;
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if (g_file_get_contents("/sys/module/vhost/parameters/max_mem_regions",
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&s, NULL, NULL)) {
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uint64_t val = g_ascii_strtoull(s, NULL, 10);
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if (val < INT_MAX && val > 0) {
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g_free(s);
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return val;
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}
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error_report("ignoring invalid max_mem_regions value in vhost module:"
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" %s", s);
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}
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g_free(s);
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return limit;
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}
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static int vhost_kernel_net_set_backend(struct vhost_dev *dev,
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struct vhost_vring_file *file)
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{
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return vhost_kernel_call(dev, VHOST_NET_SET_BACKEND, file);
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}
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static int vhost_kernel_scsi_set_endpoint(struct vhost_dev *dev,
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struct vhost_scsi_target *target)
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{
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return vhost_kernel_call(dev, VHOST_SCSI_SET_ENDPOINT, target);
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}
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static int vhost_kernel_scsi_clear_endpoint(struct vhost_dev *dev,
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struct vhost_scsi_target *target)
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{
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return vhost_kernel_call(dev, VHOST_SCSI_CLEAR_ENDPOINT, target);
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}
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static int vhost_kernel_scsi_get_abi_version(struct vhost_dev *dev, int *version)
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{
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return vhost_kernel_call(dev, VHOST_SCSI_GET_ABI_VERSION, version);
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}
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static int vhost_kernel_set_log_base(struct vhost_dev *dev, uint64_t base,
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struct vhost_log *log)
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{
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return vhost_kernel_call(dev, VHOST_SET_LOG_BASE, &base);
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}
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static int vhost_kernel_set_mem_table(struct vhost_dev *dev,
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struct vhost_memory *mem)
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{
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return vhost_kernel_call(dev, VHOST_SET_MEM_TABLE, mem);
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}
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static int vhost_kernel_set_vring_addr(struct vhost_dev *dev,
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struct vhost_vring_addr *addr)
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{
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return vhost_kernel_call(dev, VHOST_SET_VRING_ADDR, addr);
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}
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static int vhost_kernel_set_vring_endian(struct vhost_dev *dev,
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struct vhost_vring_state *ring)
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{
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return vhost_kernel_call(dev, VHOST_SET_VRING_ENDIAN, ring);
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}
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static int vhost_kernel_set_vring_num(struct vhost_dev *dev,
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struct vhost_vring_state *ring)
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{
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return vhost_kernel_call(dev, VHOST_SET_VRING_NUM, ring);
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}
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static int vhost_kernel_set_vring_base(struct vhost_dev *dev,
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struct vhost_vring_state *ring)
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{
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return vhost_kernel_call(dev, VHOST_SET_VRING_BASE, ring);
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}
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static int vhost_kernel_get_vring_base(struct vhost_dev *dev,
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struct vhost_vring_state *ring)
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{
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return vhost_kernel_call(dev, VHOST_GET_VRING_BASE, ring);
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}
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static int vhost_kernel_set_vring_kick(struct vhost_dev *dev,
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struct vhost_vring_file *file)
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{
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return vhost_kernel_call(dev, VHOST_SET_VRING_KICK, file);
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}
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static int vhost_kernel_set_vring_call(struct vhost_dev *dev,
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struct vhost_vring_file *file)
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{
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return vhost_kernel_call(dev, VHOST_SET_VRING_CALL, file);
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}
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static int vhost_kernel_set_vring_err(struct vhost_dev *dev,
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struct vhost_vring_file *file)
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{
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return vhost_kernel_call(dev, VHOST_SET_VRING_ERR, file);
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}
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static int vhost_kernel_set_vring_busyloop_timeout(struct vhost_dev *dev,
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struct vhost_vring_state *s)
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{
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return vhost_kernel_call(dev, VHOST_SET_VRING_BUSYLOOP_TIMEOUT, s);
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}
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static int vhost_kernel_set_features(struct vhost_dev *dev,
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uint64_t features)
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{
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return vhost_kernel_call(dev, VHOST_SET_FEATURES, &features);
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}
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static int vhost_kernel_set_backend_cap(struct vhost_dev *dev)
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{
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uint64_t features;
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uint64_t f = 0x1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2;
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int r;
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if (vhost_kernel_call(dev, VHOST_GET_BACKEND_FEATURES, &features)) {
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return 0;
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}
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features &= f;
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r = vhost_kernel_call(dev, VHOST_SET_BACKEND_FEATURES,
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&features);
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if (r) {
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return 0;
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}
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dev->backend_cap = features;
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return 0;
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}
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static int vhost_kernel_get_features(struct vhost_dev *dev,
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uint64_t *features)
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{
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return vhost_kernel_call(dev, VHOST_GET_FEATURES, features);
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}
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static int vhost_kernel_set_owner(struct vhost_dev *dev)
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{
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return vhost_kernel_call(dev, VHOST_SET_OWNER, NULL);
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}
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static int vhost_kernel_get_vq_index(struct vhost_dev *dev, int idx)
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{
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assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs);
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return idx - dev->vq_index;
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}
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static int vhost_kernel_vsock_set_guest_cid(struct vhost_dev *dev,
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uint64_t guest_cid)
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{
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return vhost_kernel_call(dev, VHOST_VSOCK_SET_GUEST_CID, &guest_cid);
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}
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static int vhost_kernel_vsock_set_running(struct vhost_dev *dev, int start)
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{
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return vhost_kernel_call(dev, VHOST_VSOCK_SET_RUNNING, &start);
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}
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static void vhost_kernel_iotlb_read(void *opaque)
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{
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struct vhost_dev *dev = opaque;
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ssize_t len;
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if (dev->backend_cap &
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(0x1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2)) {
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struct vhost_msg_v2 msg;
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while ((len = read((uintptr_t)dev->opaque, &msg, sizeof msg)) > 0) {
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if (len < sizeof msg) {
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error_report("Wrong vhost message len: %d", (int)len);
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break;
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}
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if (msg.type != VHOST_IOTLB_MSG_V2) {
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error_report("Unknown vhost iotlb message type");
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break;
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}
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vhost_backend_handle_iotlb_msg(dev, &msg.iotlb);
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}
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} else {
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struct vhost_msg msg;
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while ((len = read((uintptr_t)dev->opaque, &msg, sizeof msg)) > 0) {
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if (len < sizeof msg) {
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error_report("Wrong vhost message len: %d", (int)len);
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break;
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}
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if (msg.type != VHOST_IOTLB_MSG) {
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error_report("Unknown vhost iotlb message type");
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break;
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}
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vhost_backend_handle_iotlb_msg(dev, &msg.iotlb);
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}
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}
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}
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static int vhost_kernel_send_device_iotlb_msg(struct vhost_dev *dev,
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struct vhost_iotlb_msg *imsg)
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{
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if (dev->backend_cap & (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2)) {
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struct vhost_msg_v2 msg = {};
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msg.type = VHOST_IOTLB_MSG_V2;
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msg.iotlb = *imsg;
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if (write((uintptr_t)dev->opaque, &msg, sizeof msg) != sizeof msg) {
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error_report("Fail to update device iotlb");
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return -EFAULT;
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}
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} else {
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struct vhost_msg msg = {};
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msg.type = VHOST_IOTLB_MSG;
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msg.iotlb = *imsg;
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if (write((uintptr_t)dev->opaque, &msg, sizeof msg) != sizeof msg) {
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error_report("Fail to update device iotlb");
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return -EFAULT;
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}
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}
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return 0;
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}
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static void vhost_kernel_set_iotlb_callback(struct vhost_dev *dev,
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int enabled)
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{
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if (enabled)
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qemu_set_fd_handler((uintptr_t)dev->opaque,
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vhost_kernel_iotlb_read, NULL, dev);
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else
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qemu_set_fd_handler((uintptr_t)dev->opaque, NULL, NULL, NULL);
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}
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const VhostOps kernel_ops = {
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.backend_type = VHOST_BACKEND_TYPE_KERNEL,
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.vhost_backend_init = vhost_kernel_init,
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.vhost_backend_cleanup = vhost_kernel_cleanup,
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.vhost_backend_memslots_limit = vhost_kernel_memslots_limit,
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.vhost_net_set_backend = vhost_kernel_net_set_backend,
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.vhost_scsi_set_endpoint = vhost_kernel_scsi_set_endpoint,
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.vhost_scsi_clear_endpoint = vhost_kernel_scsi_clear_endpoint,
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.vhost_scsi_get_abi_version = vhost_kernel_scsi_get_abi_version,
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.vhost_set_log_base = vhost_kernel_set_log_base,
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.vhost_set_mem_table = vhost_kernel_set_mem_table,
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.vhost_set_vring_addr = vhost_kernel_set_vring_addr,
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.vhost_set_vring_endian = vhost_kernel_set_vring_endian,
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.vhost_set_vring_num = vhost_kernel_set_vring_num,
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.vhost_set_vring_base = vhost_kernel_set_vring_base,
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.vhost_get_vring_base = vhost_kernel_get_vring_base,
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.vhost_set_vring_kick = vhost_kernel_set_vring_kick,
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.vhost_set_vring_call = vhost_kernel_set_vring_call,
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.vhost_set_vring_err = vhost_kernel_set_vring_err,
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.vhost_set_vring_busyloop_timeout =
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vhost_kernel_set_vring_busyloop_timeout,
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.vhost_set_features = vhost_kernel_set_features,
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.vhost_get_features = vhost_kernel_get_features,
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.vhost_set_backend_cap = vhost_kernel_set_backend_cap,
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.vhost_set_owner = vhost_kernel_set_owner,
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.vhost_get_vq_index = vhost_kernel_get_vq_index,
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.vhost_vsock_set_guest_cid = vhost_kernel_vsock_set_guest_cid,
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.vhost_vsock_set_running = vhost_kernel_vsock_set_running,
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.vhost_set_iotlb_callback = vhost_kernel_set_iotlb_callback,
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.vhost_send_device_iotlb_msg = vhost_kernel_send_device_iotlb_msg,
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};
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#endif
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int vhost_backend_update_device_iotlb(struct vhost_dev *dev,
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uint64_t iova, uint64_t uaddr,
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uint64_t len,
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IOMMUAccessFlags perm)
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{
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struct vhost_iotlb_msg imsg;
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imsg.iova = iova;
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imsg.uaddr = uaddr;
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imsg.size = len;
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imsg.type = VHOST_IOTLB_UPDATE;
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switch (perm) {
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case IOMMU_RO:
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imsg.perm = VHOST_ACCESS_RO;
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break;
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case IOMMU_WO:
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imsg.perm = VHOST_ACCESS_WO;
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break;
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case IOMMU_RW:
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imsg.perm = VHOST_ACCESS_RW;
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break;
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default:
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return -EINVAL;
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}
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if (dev->vhost_ops && dev->vhost_ops->vhost_send_device_iotlb_msg)
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return dev->vhost_ops->vhost_send_device_iotlb_msg(dev, &imsg);
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return -ENODEV;
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}
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int vhost_backend_invalidate_device_iotlb(struct vhost_dev *dev,
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uint64_t iova, uint64_t len)
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{
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struct vhost_iotlb_msg imsg;
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imsg.iova = iova;
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imsg.size = len;
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imsg.type = VHOST_IOTLB_INVALIDATE;
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if (dev->vhost_ops && dev->vhost_ops->vhost_send_device_iotlb_msg)
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return dev->vhost_ops->vhost_send_device_iotlb_msg(dev, &imsg);
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return -ENODEV;
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}
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int vhost_backend_handle_iotlb_msg(struct vhost_dev *dev,
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struct vhost_iotlb_msg *imsg)
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{
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int ret = 0;
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if (unlikely(!dev->vdev)) {
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error_report("Unexpected IOTLB message when virtio device is stopped");
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return -EINVAL;
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}
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switch (imsg->type) {
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case VHOST_IOTLB_MISS:
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ret = vhost_device_iotlb_miss(dev, imsg->iova,
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imsg->perm != VHOST_ACCESS_RO);
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break;
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case VHOST_IOTLB_ACCESS_FAIL:
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/* FIXME: report device iotlb error */
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error_report("Access failure IOTLB message type not supported");
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ret = -ENOTSUP;
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break;
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case VHOST_IOTLB_UPDATE:
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case VHOST_IOTLB_INVALIDATE:
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default:
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error_report("Unexpected IOTLB message type");
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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