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authorEugenio Pérez <eperezma@redhat.com>2023-06-09 12:21:26 +0300
committerMichael S. Tsirkin <mst@redhat.com>2023-09-04 01:10:22 +0300
commitb63e5c70c39349ea5b9e7dbb604551902fc753fc (patch)
tree60105d6153280fe4dfa5ce68157b3b40a2681ddb /drivers/vhost
parent9f09fd6171fe8badef7875ab1642e67360bc5483 (diff)
downloadlinux-b63e5c70c39349ea5b9e7dbb604551902fc753fc.tar.xz
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')
-rw-r--r--drivers/vhost/vdpa.c12
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;