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vduse: add VDUSE_SET_FEATURES ioctl

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Add an ioctl to allow VDUSE instances to set the VDUSE features
supported by the userland VDUSE instance.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-ID: <20260707122502.239022-4-eperezma@redhat.com>
This commit is contained in:
Eugenio Pérez
2026-07-07 14:25:01 +02:00
committed by Michael S. Tsirkin
parent a596238c2a
commit 3b441820cb
2 changed files with 27 additions and 0 deletions
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24
drivers/vdpa/vdpa_user/vduse_dev.c
View File

@@ -159,6 +159,7 @@ struct vduse_dev_msg {
struct vduse_control {
u64 api_version;
u64 vduse_features;
};
static DEFINE_MUTEX(vduse_lock);
@@ -2348,7 +2349,29 @@ static long vduse_ioctl(struct file *file, unsigned int cmd,
case VDUSE_GET_FEATURES:
ret = put_user(vduse_features, (u64 __user *)argp);
break;
case VDUSE_SET_FEATURES: {
u64 features;
ret = -EFAULT;
if (get_user(features, (u64 __user *)argp)) {
dev_dbg(vduse_ctrl_dev, "Could not get vduse features");
break;
}
ret = -EINVAL;
if (features & ~vduse_features) {
dev_dbg(vduse_ctrl_dev,
"Invalid features in %llx, expected %llx",
features, vduse_features);
break;
}
ret = 0;
control->vduse_features = features;
dev_dbg(vduse_ctrl_dev, "Set features %llx", features);
break;
}
default:
ret = -EINVAL;
break;
@@ -2375,6 +2398,7 @@ static int vduse_open(struct inode *inode, struct file *file)
return -ENOMEM;
control->api_version = VDUSE_API_VERSION_NOT_ASKED;
control->vduse_features = 0;
file->private_data = control;
return 0;

3
include/uapi/linux/vduse.h
View File

@@ -66,6 +66,9 @@ struct vduse_dev_config {
/* Get the VDUSE supported features */
#define VDUSE_GET_FEATURES _IOR(VDUSE_BASE, 0x04, __u64)
/* Set the VDUSE features */
#define VDUSE_SET_FEATURES _IOW(VDUSE_BASE, 0x05, __u64)
/* The ioctls for VDUSE device (/dev/vduse/$NAME) */
/**