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vhost_vdpa: Support config interrupt in vdpa 

This commit implements config interrupt support in
vhost_vdpa layer.

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/1591352835-22441-4-git-send-email-lingshan.zhu@intel.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Lingshan 2020-06-05 18:27:13 +08:00 committed by Michael S. Tsirkin
parent bb02e6e63d
commit 776f395004
2 changed files with 51 additions and 0 deletions
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47
drivers/vhost/vdpa.c
View File

@ -22,6 +22,7 @@
#include <linux/nospec.h>
#include <linux/vhost.h>
#include <linux/virtio_net.h>
#include <linux/kernel.h>
#include "vhost.h"
@ -71,6 +72,7 @@ struct vhost_vdpa {
int nvqs;
int virtio_id;
int minor;
struct eventfd_ctx *config_ctx;
};
static DEFINE_IDA(vhost_vdpa_ida);
@ -102,6 +104,17 @@ static irqreturn_t vhost_vdpa_virtqueue_cb(void *private)
return IRQ_HANDLED;
}
static irqreturn_t vhost_vdpa_config_cb(void *private)
{
struct vhost_vdpa *v = private;
struct eventfd_ctx *config_ctx = v->config_ctx;
if (config_ctx)
eventfd_signal(config_ctx, 1);
return IRQ_HANDLED;
}
static void vhost_vdpa_reset(struct vhost_vdpa *v)
{
struct vdpa_device *vdpa = v->vdpa;
@ -289,6 +302,36 @@ static long vhost_vdpa_get_vring_num(struct vhost_vdpa *v, u16 __user *argp)
return 0;
}
static void vhost_vdpa_config_put(struct vhost_vdpa *v)
{
if (v->config_ctx)
eventfd_ctx_put(v->config_ctx);
}
static long vhost_vdpa_set_config_call(struct vhost_vdpa *v, u32 __user *argp)
{
struct vdpa_callback cb;
int fd;
struct eventfd_ctx *ctx;
cb.callback = vhost_vdpa_config_cb;
cb.private = v->vdpa;
if (copy_from_user(&fd, argp, sizeof(fd)))
return -EFAULT;
ctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd);
swap(ctx, v->config_ctx);
if (!IS_ERR_OR_NULL(ctx))
eventfd_ctx_put(ctx);
if (IS_ERR(v->config_ctx))
return PTR_ERR(v->config_ctx);
v->vdpa->config->set_config_cb(v->vdpa, &cb);
return 0;
}
static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
void __user *argp)
{
@ -396,6 +439,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
case VHOST_SET_LOG_FD:
r = -ENOIOCTLCMD;
break;
case VHOST_VDPA_SET_CONFIG_CALL:
r = vhost_vdpa_set_config_call(v, argp);
break;
default:
r = vhost_dev_ioctl(&v->vdev, cmd, argp);
if (r == -ENOIOCTLCMD)
@ -730,6 +776,7 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep)
vhost_dev_stop(&v->vdev);
vhost_vdpa_iotlb_free(v);
vhost_vdpa_free_domain(v);
vhost_vdpa_config_put(v);
vhost_dev_cleanup(&v->vdev);
kfree(v->vdev.vqs);
mutex_unlock(&d->mutex);

4
include/uapi/linux/vhost.h
View File

@ -15,6 +15,8 @@
#include <linux/types.h>
#include <linux/ioctl.h>
#define VHOST_FILE_UNBIND -1
/* ioctls */
#define VHOST_VIRTIO 0xAF
@ -140,4 +142,6 @@
/* Get the max ring size. */
#define VHOST_VDPA_GET_VRING_NUM _IOR(VHOST_VIRTIO, 0x76, __u16)
/* Set event fd for config interrupt*/
#define VHOST_VDPA_SET_CONFIG_CALL _IOW(VHOST_VIRTIO, 0x77, int)
#endif