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| author | Eugenio Pérez <eperezma@redhat.com> | 2023-06-09 11:21:26 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-09-03 18:10:22 -0400 |
| commit | b63e5c70c39349ea5b9e7dbb604551902fc753fc (patch) | |
| tree | 60105d6153280fe4dfa5ce68157b3b40a2681ddb /drivers/vhost/vdpa.c | |
| parent | 9f09fd6171fe8badef7875ab1642e67360bc5483 (diff) | |
| download | linux-b63e5c70c39349ea5b9e7dbb604551902fc753fc.tar.gz linux-b63e5c70c39349ea5b9e7dbb604551902fc753fc.tar.bz2 linux-b63e5c70c39349ea5b9e7dbb604551902fc753fc.zip | |
vdpa: add get_backend_features vdpa operation
This operation allow vdpa parent to expose its own backend feature bits.
Next patches introduce a feature not compatible with all parent drivers:
the ability to enable vq after driver_ok. Each parent must declare if
it allows it or not.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Shannon Nelson <shannon.nelson@amd.com>
Message-Id: <20230609092127.170673-4-eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost/vdpa.c')
| -rw-r--r-- | drivers/vhost/vdpa.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index bb5734323d7d..78379ffd2336 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -403,6 +403,17 @@ static long vhost_vdpa_get_features(struct vhost_vdpa *v, u64 __user *featurep) return 0; } +static u64 vhost_vdpa_get_backend_features(const struct vhost_vdpa *v) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + + if (!ops->get_backend_features) + return 0; + else + return ops->get_backend_features(vdpa); +} + static long vhost_vdpa_set_features(struct vhost_vdpa *v, u64 __user *featurep) { struct vdpa_device *vdpa = v->vdpa; @@ -742,6 +753,7 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, features |= BIT_ULL(VHOST_BACKEND_F_SUSPEND); if (vhost_vdpa_can_resume(v)) features |= BIT_ULL(VHOST_BACKEND_F_RESUME); + features |= vhost_vdpa_get_backend_features(v); if (copy_to_user(featurep, &features, sizeof(features))) r = -EFAULT; break; |