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authorZhu Lingshan <lingshan.zhu@intel.com>2020-06-05 13:27:13 +0300
committerMichael S. Tsirkin <mst@redhat.com>2020-06-06 23:26:27 +0300
commit776f395004d829bbbf18c159ed9beb517a208c71 (patch)
tree07c2187fc81a89d6c7b86a50418de85f9f1f23a7 /drivers/vhost
parentbb02e6e63d0e71188bc5fe5f4732e66bc8b5dceb (diff)
downloadlinux-776f395004d829bbbf18c159ed9beb517a208c71.tar.xz
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>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/vdpa.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 6ca7660ee6b5..77a0c9fb6cc3 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -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);