mirror of
https://github.com/qemu/qemu.git
synced 2024-11-29 23:03:41 +08:00
5f6f6664bf
The initialization takes a chardev backed by a unix domain socket. It should implement qemu_fe_set_msgfds in order to be able to pass file descriptors to the remote process. Each ioctl request of vhost-kernel has a vhost-user message equivalent, which is sent over the control socket. The general approach is to copy the data from the supplied argument pointer to a designated field in the message. If a file descriptor is to be passed it will be placed in the fds array for inclusion in the sendmsg control header. VHOST_SET_MEM_TABLE ignores the supplied vhost_memory structure and scans the global ram_list for ram blocks with a valid fd field set. This would be set when the '-object memory-file' option with share=on property is used. Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com> Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
72 lines
1.6 KiB
C
72 lines
1.6 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 "hw/virtio/vhost.h"
|
|
#include "hw/virtio/vhost-backend.h"
|
|
#include "qemu/error-report.h"
|
|
|
|
#include <sys/ioctl.h>
|
|
|
|
extern const VhostOps user_ops;
|
|
|
|
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 const VhostOps kernel_ops = {
|
|
.backend_type = VHOST_BACKEND_TYPE_KERNEL,
|
|
.vhost_call = vhost_kernel_call,
|
|
.vhost_backend_init = vhost_kernel_init,
|
|
.vhost_backend_cleanup = vhost_kernel_cleanup
|
|
};
|
|
|
|
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\n");
|
|
r = -1;
|
|
}
|
|
|
|
return r;
|
|
}
|