lkml.org 
[lkml]   [2020]   [Aug]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH V4 linux-next 03/12] vhost-vdpa: support get/set backend features
Date
From: Jason Wang <jasowang@redhat.com>

This patch makes userspace can get and set backend features to
vhost-vdpa.

Signed-off-by: Cindy Lu <lulu@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/vhost/vdpa.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 563ae6204052..2f0310d1b914 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -26,6 +26,10 @@

#include "vhost.h"

+enum {
+ VHOST_VDPA_BACKEND_FEATURES = (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2)
+};
+
/* Currently, only network backend w/o multiqueue is supported. */
#define VHOST_VDPA_VQ_MAX 2

@@ -364,6 +368,8 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
struct vdpa_callback cb;
struct vhost_virtqueue *vq;
struct vhost_vring_state s;
+ u64 __user *featurep = argp;
+ u64 features;
u32 idx;
long r;

@@ -386,6 +392,18 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
case VHOST_GET_VRING_BASE:
vq->last_avail_idx = ops->get_vq_state(v->vdpa, idx);
break;
+ case VHOST_GET_BACKEND_FEATURES:
+ features = VHOST_VDPA_BACKEND_FEATURES;
+ if (copy_to_user(featurep, &features, sizeof(features)))
+ return -EFAULT;
+ return 0;
+ case VHOST_SET_BACKEND_FEATURES:
+ if (copy_from_user(&features, featurep, sizeof(features)))
+ return -EFAULT;
+ if (features & ~VHOST_VDPA_BACKEND_FEATURES)
+ return -EOPNOTSUPP;
+ vhost_set_backend_features(&v->vdev, features);
+ return 0;
}

r = vhost_vring_ioctl(&v->vdev, cmd, argp);
--
2.26.0
\
 
 \ /
  Last update: 2020-08-04 18:22    [W:0.183 / U:0.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site