qemu/hw/virtio/vhost-backend.c
Konstantin Khlebnikov 60dc3c5be9 vhost: add method vhost_set_vring_err
Kernel and user vhost may report virtqueue errors via eventfd.
This is only reliable way to get notification about protocol error.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Message-Id: <20220623161325.18813-2-vsementsov@yandex-team.ru>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Roman Kagan <rvkagan@yandex-team.ru>
2022-06-27 18:53:18 -04:00

411 lines
12 KiB
C

/*
* vhost-backend
*
* Copyright (c) 2013 Virtual Open Systems Sarl.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "hw/virtio/vhost.h"
#include "hw/virtio/vhost-backend.h"
#include "qemu/error-report.h"
#include "qemu/main-loop.h"
#include "standard-headers/linux/vhost_types.h"
#include "hw/virtio/vhost-vdpa.h"
#ifdef CONFIG_VHOST_KERNEL
#include <linux/vhost.h>
#include <sys/ioctl.h>
static int vhost_kernel_call(struct vhost_dev *dev, unsigned long int request,
void *arg)
{
int fd = (uintptr_t) dev->opaque;
int ret;
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL);
ret = ioctl(fd, request, arg);
return ret < 0 ? -errno : ret;
}
static int vhost_kernel_init(struct vhost_dev *dev, void *opaque, Error **errp)
{
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL);
dev->opaque = opaque;
return 0;
}
static int vhost_kernel_cleanup(struct vhost_dev *dev)
{
int fd = (uintptr_t) dev->opaque;
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL);
return close(fd) < 0 ? -errno : 0;
}
static int vhost_kernel_memslots_limit(struct vhost_dev *dev)
{
int limit = 64;
char *s;
if (g_file_get_contents("/sys/module/vhost/parameters/max_mem_regions",
&s, NULL, NULL)) {
uint64_t val = g_ascii_strtoull(s, NULL, 10);
if (val < INT_MAX && val > 0) {
g_free(s);
return val;
}
error_report("ignoring invalid max_mem_regions value in vhost module:"
" %s", s);
}
g_free(s);
return limit;
}
static int vhost_kernel_net_set_backend(struct vhost_dev *dev,
struct vhost_vring_file *file)
{
return vhost_kernel_call(dev, VHOST_NET_SET_BACKEND, file);
}
static int vhost_kernel_scsi_set_endpoint(struct vhost_dev *dev,
struct vhost_scsi_target *target)
{
return vhost_kernel_call(dev, VHOST_SCSI_SET_ENDPOINT, target);
}
static int vhost_kernel_scsi_clear_endpoint(struct vhost_dev *dev,
struct vhost_scsi_target *target)
{
return vhost_kernel_call(dev, VHOST_SCSI_CLEAR_ENDPOINT, target);
}
static int vhost_kernel_scsi_get_abi_version(struct vhost_dev *dev, int *version)
{
return vhost_kernel_call(dev, VHOST_SCSI_GET_ABI_VERSION, version);
}
static int vhost_kernel_set_log_base(struct vhost_dev *dev, uint64_t base,
struct vhost_log *log)
{
return vhost_kernel_call(dev, VHOST_SET_LOG_BASE, &base);
}
static int vhost_kernel_set_mem_table(struct vhost_dev *dev,
struct vhost_memory *mem)
{
return vhost_kernel_call(dev, VHOST_SET_MEM_TABLE, mem);
}
static int vhost_kernel_set_vring_addr(struct vhost_dev *dev,
struct vhost_vring_addr *addr)
{
return vhost_kernel_call(dev, VHOST_SET_VRING_ADDR, addr);
}
static int vhost_kernel_set_vring_endian(struct vhost_dev *dev,
struct vhost_vring_state *ring)
{
return vhost_kernel_call(dev, VHOST_SET_VRING_ENDIAN, ring);
}
static int vhost_kernel_set_vring_num(struct vhost_dev *dev,
struct vhost_vring_state *ring)
{
return vhost_kernel_call(dev, VHOST_SET_VRING_NUM, ring);
}
static int vhost_kernel_set_vring_base(struct vhost_dev *dev,
struct vhost_vring_state *ring)
{
return vhost_kernel_call(dev, VHOST_SET_VRING_BASE, ring);
}
static int vhost_kernel_get_vring_base(struct vhost_dev *dev,
struct vhost_vring_state *ring)
{
return vhost_kernel_call(dev, VHOST_GET_VRING_BASE, ring);
}
static int vhost_kernel_set_vring_kick(struct vhost_dev *dev,
struct vhost_vring_file *file)
{
return vhost_kernel_call(dev, VHOST_SET_VRING_KICK, file);
}
static int vhost_kernel_set_vring_call(struct vhost_dev *dev,
struct vhost_vring_file *file)
{
return vhost_kernel_call(dev, VHOST_SET_VRING_CALL, file);
}
static int vhost_kernel_set_vring_err(struct vhost_dev *dev,
struct vhost_vring_file *file)
{
return vhost_kernel_call(dev, VHOST_SET_VRING_ERR, file);
}
static int vhost_kernel_set_vring_busyloop_timeout(struct vhost_dev *dev,
struct vhost_vring_state *s)
{
return vhost_kernel_call(dev, VHOST_SET_VRING_BUSYLOOP_TIMEOUT, s);
}
static int vhost_kernel_set_features(struct vhost_dev *dev,
uint64_t features)
{
return vhost_kernel_call(dev, VHOST_SET_FEATURES, &features);
}
static int vhost_kernel_set_backend_cap(struct vhost_dev *dev)
{
uint64_t features;
uint64_t f = 0x1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2;
int r;
if (vhost_kernel_call(dev, VHOST_GET_BACKEND_FEATURES, &features)) {
return 0;
}
features &= f;
r = vhost_kernel_call(dev, VHOST_SET_BACKEND_FEATURES,
&features);
if (r) {
return 0;
}
dev->backend_cap = features;
return 0;
}
static int vhost_kernel_get_features(struct vhost_dev *dev,
uint64_t *features)
{
return vhost_kernel_call(dev, VHOST_GET_FEATURES, features);
}
static int vhost_kernel_set_owner(struct vhost_dev *dev)
{
return vhost_kernel_call(dev, VHOST_SET_OWNER, NULL);
}
static int vhost_kernel_reset_device(struct vhost_dev *dev)
{
return vhost_kernel_call(dev, VHOST_RESET_OWNER, NULL);
}
static int vhost_kernel_get_vq_index(struct vhost_dev *dev, int idx)
{
assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs);
return idx - dev->vq_index;
}
static int vhost_kernel_vsock_set_guest_cid(struct vhost_dev *dev,
uint64_t guest_cid)
{
return vhost_kernel_call(dev, VHOST_VSOCK_SET_GUEST_CID, &guest_cid);
}
static int vhost_kernel_vsock_set_running(struct vhost_dev *dev, int start)
{
return vhost_kernel_call(dev, VHOST_VSOCK_SET_RUNNING, &start);
}
static void vhost_kernel_iotlb_read(void *opaque)
{
struct vhost_dev *dev = opaque;
ssize_t len;
if (dev->backend_cap &
(0x1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2)) {
struct vhost_msg_v2 msg;
while ((len = read((uintptr_t)dev->opaque, &msg, sizeof msg)) > 0) {
if (len < sizeof msg) {
error_report("Wrong vhost message len: %d", (int)len);
break;
}
if (msg.type != VHOST_IOTLB_MSG_V2) {
error_report("Unknown vhost iotlb message type");
break;
}
vhost_backend_handle_iotlb_msg(dev, &msg.iotlb);
}
} else {
struct vhost_msg msg;
while ((len = read((uintptr_t)dev->opaque, &msg, sizeof msg)) > 0) {
if (len < sizeof msg) {
error_report("Wrong vhost message len: %d", (int)len);
break;
}
if (msg.type != VHOST_IOTLB_MSG) {
error_report("Unknown vhost iotlb message type");
break;
}
vhost_backend_handle_iotlb_msg(dev, &msg.iotlb);
}
}
}
static int vhost_kernel_send_device_iotlb_msg(struct vhost_dev *dev,
struct vhost_iotlb_msg *imsg)
{
if (dev->backend_cap & (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2)) {
struct vhost_msg_v2 msg = {};
msg.type = VHOST_IOTLB_MSG_V2;
msg.iotlb = *imsg;
if (write((uintptr_t)dev->opaque, &msg, sizeof msg) != sizeof msg) {
error_report("Fail to update device iotlb");
return -EFAULT;
}
} else {
struct vhost_msg msg = {};
msg.type = VHOST_IOTLB_MSG;
msg.iotlb = *imsg;
if (write((uintptr_t)dev->opaque, &msg, sizeof msg) != sizeof msg) {
error_report("Fail to update device iotlb");
return -EFAULT;
}
}
return 0;
}
static void vhost_kernel_set_iotlb_callback(struct vhost_dev *dev,
int enabled)
{
if (enabled)
qemu_set_fd_handler((uintptr_t)dev->opaque,
vhost_kernel_iotlb_read, NULL, dev);
else
qemu_set_fd_handler((uintptr_t)dev->opaque, NULL, NULL, NULL);
}
const VhostOps kernel_ops = {
.backend_type = VHOST_BACKEND_TYPE_KERNEL,
.vhost_backend_init = vhost_kernel_init,
.vhost_backend_cleanup = vhost_kernel_cleanup,
.vhost_backend_memslots_limit = vhost_kernel_memslots_limit,
.vhost_net_set_backend = vhost_kernel_net_set_backend,
.vhost_scsi_set_endpoint = vhost_kernel_scsi_set_endpoint,
.vhost_scsi_clear_endpoint = vhost_kernel_scsi_clear_endpoint,
.vhost_scsi_get_abi_version = vhost_kernel_scsi_get_abi_version,
.vhost_set_log_base = vhost_kernel_set_log_base,
.vhost_set_mem_table = vhost_kernel_set_mem_table,
.vhost_set_vring_addr = vhost_kernel_set_vring_addr,
.vhost_set_vring_endian = vhost_kernel_set_vring_endian,
.vhost_set_vring_num = vhost_kernel_set_vring_num,
.vhost_set_vring_base = vhost_kernel_set_vring_base,
.vhost_get_vring_base = vhost_kernel_get_vring_base,
.vhost_set_vring_kick = vhost_kernel_set_vring_kick,
.vhost_set_vring_call = vhost_kernel_set_vring_call,
.vhost_set_vring_err = vhost_kernel_set_vring_err,
.vhost_set_vring_busyloop_timeout =
vhost_kernel_set_vring_busyloop_timeout,
.vhost_set_features = vhost_kernel_set_features,
.vhost_get_features = vhost_kernel_get_features,
.vhost_set_backend_cap = vhost_kernel_set_backend_cap,
.vhost_set_owner = vhost_kernel_set_owner,
.vhost_reset_device = vhost_kernel_reset_device,
.vhost_get_vq_index = vhost_kernel_get_vq_index,
.vhost_vsock_set_guest_cid = vhost_kernel_vsock_set_guest_cid,
.vhost_vsock_set_running = vhost_kernel_vsock_set_running,
.vhost_set_iotlb_callback = vhost_kernel_set_iotlb_callback,
.vhost_send_device_iotlb_msg = vhost_kernel_send_device_iotlb_msg,
};
#endif
int vhost_backend_update_device_iotlb(struct vhost_dev *dev,
uint64_t iova, uint64_t uaddr,
uint64_t len,
IOMMUAccessFlags perm)
{
struct vhost_iotlb_msg imsg;
imsg.iova = iova;
imsg.uaddr = uaddr;
imsg.size = len;
imsg.type = VHOST_IOTLB_UPDATE;
switch (perm) {
case IOMMU_RO:
imsg.perm = VHOST_ACCESS_RO;
break;
case IOMMU_WO:
imsg.perm = VHOST_ACCESS_WO;
break;
case IOMMU_RW:
imsg.perm = VHOST_ACCESS_RW;
break;
default:
return -EINVAL;
}
if (dev->vhost_ops && dev->vhost_ops->vhost_send_device_iotlb_msg)
return dev->vhost_ops->vhost_send_device_iotlb_msg(dev, &imsg);
return -ENODEV;
}
int vhost_backend_invalidate_device_iotlb(struct vhost_dev *dev,
uint64_t iova, uint64_t len)
{
struct vhost_iotlb_msg imsg;
imsg.iova = iova;
imsg.size = len;
imsg.type = VHOST_IOTLB_INVALIDATE;
if (dev->vhost_ops && dev->vhost_ops->vhost_send_device_iotlb_msg)
return dev->vhost_ops->vhost_send_device_iotlb_msg(dev, &imsg);
return -ENODEV;
}
int vhost_backend_handle_iotlb_msg(struct vhost_dev *dev,
struct vhost_iotlb_msg *imsg)
{
int ret = 0;
if (unlikely(!dev->vdev)) {
error_report("Unexpected IOTLB message when virtio device is stopped");
return -EINVAL;
}
switch (imsg->type) {
case VHOST_IOTLB_MISS:
ret = vhost_device_iotlb_miss(dev, imsg->iova,
imsg->perm != VHOST_ACCESS_RO);
break;
case VHOST_IOTLB_ACCESS_FAIL:
/* FIXME: report device iotlb error */
error_report("Access failure IOTLB message type not supported");
ret = -ENOTSUP;
break;
case VHOST_IOTLB_UPDATE:
case VHOST_IOTLB_INVALIDATE:
default:
error_report("Unexpected IOTLB message type");
ret = -EINVAL;
break;
}
return ret;
}