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vduse: bump version number

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Finalize the series by advertising VDUSE API v1 support to userspace.

Now that all required infrastructure for v1 (ASIDs, VQ groups,
update_iotlb_v2) is in place, VDUSE devices can opt in to the new
features.

Assume API version 0 if the VDUSE instance does not call
VDUSE_GET_API_VERSION to maintain compatibility.

Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20260119143306.1818855-13-eperezma@redhat.com>
This commit is contained in:
Eugenio Pérez
2026-01-28 15:32:18 -05:00
committed by Michael S. Tsirkin
parent 079212f687
commit 12e0043d33
1 changed files with 15 additions and 2 deletions
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drivers/vdpa/vdpa_user/vduse_dev.c
+15 -2
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@@ -52,6 +52,15 @@
#define IRQ_UNBOUND -1
/*
* VDUSE instance have not asked the vduse API version, so assume 0.
*
* Old devices may not ask for the device version and assume it is 0. Keep
* this value for these. From the moment the VDUSE instance ask for the
* version, convert to the latests supported one and continue regular flow
*/
#define VDUSE_API_VERSION_NOT_ASKED U64_MAX
struct vduse_virtqueue {
u16 index;
u16 num_max;
@@ -2153,6 +2162,8 @@ static long vduse_ioctl(struct file *file, unsigned int cmd,
mutex_lock(&vduse_lock);
switch (cmd) {
case VDUSE_GET_API_VERSION:
if (control->api_version == VDUSE_API_VERSION_NOT_ASKED)
control->api_version = VDUSE_API_VERSION_1;
ret = put_user(control->api_version, (u64 __user *)argp);
break;
case VDUSE_SET_API_VERSION: {
@@ -2163,7 +2174,7 @@ static long vduse_ioctl(struct file *file, unsigned int cmd,
break;
ret = -EINVAL;
if (api_version > VDUSE_API_VERSION)
if (api_version > VDUSE_API_VERSION_1)
break;
ret = 0;
@@ -2180,6 +2191,8 @@ static long vduse_ioctl(struct file *file, unsigned int cmd,
break;
ret = -EINVAL;
if (control->api_version == VDUSE_API_VERSION_NOT_ASKED)
control->api_version = VDUSE_API_VERSION;
if (!vduse_validate_config(&config, control->api_version))
break;
@@ -2230,7 +2243,7 @@ static int vduse_open(struct inode *inode, struct file *file)
if (!control)
return -ENOMEM;
control->api_version = VDUSE_API_VERSION;
control->api_version = VDUSE_API_VERSION_NOT_ASKED;
file->private_data = control;
return 0;