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/*
* 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 <linux/vhost.h>
#include <sys/ioctl.h>
#include "hw/virtio/vhost.h"
#include "hw/virtio/vhost-backend.h"
#include "qemu/error-report.h"
static int vhost_kernel_call(struct vhost_dev *dev, unsigned long int request,
void *arg)
{
int fd = (uintptr_t) dev->opaque;
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL);
return ioctl(fd, request, arg);
}
static int vhost_kernel_init(struct vhost_dev *dev, void *opaque)
{
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);
}
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 == G_MAXUINT64 || !val) && errno)) {
return val;
}
error_report("ignoring invalid max_mem_regions value in vhost module:"
" %s", 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_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_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 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_busyloop_timeout =
vhost_kernel_set_vring_busyloop_timeout,
.vhost_set_features = vhost_kernel_set_features,
.vhost_get_features = vhost_kernel_get_features,
.vhost_set_owner = vhost_kernel_set_owner,
.vhost_reset_device = vhost_kernel_reset_device,
.vhost_get_vq_index = vhost_kernel_get_vq_index,
};
int vhost_set_backend_type(struct vhost_dev *dev, VhostBackendType backend_type)
{
int r = 0;
switch (backend_type) {
case VHOST_BACKEND_TYPE_KERNEL:
dev->vhost_ops = &kernel_ops;
break;
case VHOST_BACKEND_TYPE_USER:
dev->vhost_ops = &user_ops;
break;
default:
error_report("Unknown vhost backend type");
r = -1;
}
return r;
}
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