diff mbox series

[v7,03/18] vhost: add vhost msg support

Message ID 1651048206-282372-4-git-send-email-andy.pei@intel.com (mailing list archive)
State Superseded
Delegated to: Maxime Coquelin
Headers show
Series add virtio_blk device support to vdpa/ifc | expand

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Andy Pei April 27, 2022, 8:29 a.m. UTC
Add support for VHOST_USER_GET_CONFIG and VHOST_USER_SET_CONFIG.
VHOST_USER_GET_CONFIG and VHOST_USER_SET_CONFIG message is only
supported by virtio blk VDPA device.

Signed-off-by: Andy Pei <andy.pei@intel.com>
---
 lib/vhost/vhost_user.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/vhost/vhost_user.h | 13 ++++++++
 2 files changed, 96 insertions(+)

Comments

Xia, Chenbo May 11, 2022, 2:24 p.m. UTC | #1
> -----Original Message-----
> From: Pei, Andy <andy.pei@intel.com>
> Sent: Wednesday, April 27, 2022 4:30 PM
> To: dev@dpdk.org
> Cc: Xia, Chenbo <chenbo.xia@intel.com>; maxime.coquelin@redhat.com; Cao,
> Gang <gang.cao@intel.com>; Liu, Changpeng <changpeng.liu@intel.com>
> Subject: [PATCH v7 03/18] vhost: add vhost msg support

Title better be: vhost: add vhost msg support for get/set config

> 
> Add support for VHOST_USER_GET_CONFIG and VHOST_USER_SET_CONFIG.
> VHOST_USER_GET_CONFIG and VHOST_USER_SET_CONFIG message is only
> supported by virtio blk VDPA device.
> 
> Signed-off-by: Andy Pei <andy.pei@intel.com>
> ---
>  lib/vhost/vhost_user.c | 83
> ++++++++++++++++++++++++++++++++++++++++++++++++++
>  lib/vhost/vhost_user.h | 13 ++++++++
>  2 files changed, 96 insertions(+)
> 
> diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
> index 1d39067..e925428 100644
> --- a/lib/vhost/vhost_user.c
> +++ b/lib/vhost/vhost_user.c
> @@ -80,6 +80,8 @@
>  	[VHOST_USER_NET_SET_MTU]  = "VHOST_USER_NET_SET_MTU",
>  	[VHOST_USER_SET_SLAVE_REQ_FD]  = "VHOST_USER_SET_SLAVE_REQ_FD",
>  	[VHOST_USER_IOTLB_MSG]  = "VHOST_USER_IOTLB_MSG",
> +	[VHOST_USER_GET_CONFIG]  = "VHOST_USER_GET_CONFIG",
> +	[VHOST_USER_SET_CONFIG]  = "VHOST_USER_SET_CONFIG",
>  	[VHOST_USER_CRYPTO_CREATE_SESS] = "VHOST_USER_CRYPTO_CREATE_SESS",
>  	[VHOST_USER_CRYPTO_CLOSE_SESS] = "VHOST_USER_CRYPTO_CLOSE_SESS",
>  	[VHOST_USER_POSTCOPY_ADVISE]  = "VHOST_USER_POSTCOPY_ADVISE",
> @@ -2542,6 +2544,85 @@ static int is_vring_iotlb(struct virtio_net *dev,
>  }
> 
>  static int
> +vhost_user_get_config(struct virtio_net **pdev,
> +			struct vhu_msg_context *ctx,
> +			int main_fd __rte_unused)
> +{
> +	struct virtio_net *dev = *pdev;
> +	struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
> +	int ret = 0;
> +
> +	if (validate_msg_fds(dev, ctx, 0) != 0)
> +		return RTE_VHOST_MSG_RESULT_ERR;
> +
> +	if (vdpa_dev->ops->get_config) {
> +		ret = vdpa_dev->ops->get_config(dev->vid,
> +					   ctx->msg.payload.cfg.region,
> +					   ctx->msg.payload.cfg.size);
> +		if (ret != 0) {
> +			ctx->msg.size = 0;
> +			VHOST_LOG_CONFIG(ERR,
> +					 "(%s) get_config() return error!\n",
> +					 dev->ifname);
> +		}
> +	} else {
> +		VHOST_LOG_CONFIG(ERR, "(%s) get_config() not supported!\n",
> +				 dev->ifname);
> +	}
> +
> +	return RTE_VHOST_MSG_RESULT_REPLY;
> +}
> +
> +static int
> +vhost_user_set_config(struct virtio_net **pdev,
> +			struct vhu_msg_context *ctx,
> +			int main_fd __rte_unused)
> +{
> +	struct virtio_net *dev = *pdev;
> +	struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
> +	int ret = 0;
> +
> +	if (validate_msg_fds(dev, ctx, 0) != 0)
> +		return RTE_VHOST_MSG_RESULT_ERR;
> +
> +	if (ctx->msg.size != sizeof(struct vhost_user_config)) {
> +		VHOST_LOG_CONFIG(ERR,
> +			"(%s) invalid set config msg size: %"PRIu32" != %d\n",
> +			dev->ifname, ctx->msg.size,
> +			(int)sizeof(struct vhost_user_config));
> +		goto out;
> +	}

Sorry, I was wrong in v6, after double check, the size can be checked in read_vhost_message
(although not that accurate check). So we can remove above. (btw, even we check, the logic should
Be size <= sizeof(config))

Rest of the patch seems good, thanks.

Chenbo

> +
> +	if (ctx->msg.payload.cfg.size > VHOST_USER_MAX_CONFIG_SIZE) {
> +		VHOST_LOG_CONFIG(ERR,
> +			"(%s) vhost_user_config size: %"PRIu32", should not be
> larger than %d\n",
> +			dev->ifname, ctx->msg.payload.cfg.size,
> +			VHOST_USER_MAX_CONFIG_SIZE);
> +		goto out;
> +	}
> +
> +	if (vdpa_dev->ops->set_config) {
> +		ret = vdpa_dev->ops->set_config(dev->vid,
> +			ctx->msg.payload.cfg.region,
> +			ctx->msg.payload.cfg.offset,
> +			ctx->msg.payload.cfg.size,
> +			ctx->msg.payload.cfg.flags);
> +		if (ret)
> +			VHOST_LOG_CONFIG(ERR,
> +					 "(%s) set_config() return error!\n",
> +					 dev->ifname);
> +	} else {
> +		VHOST_LOG_CONFIG(ERR, "(%s) set_config() not supported!\n",
> +				 dev->ifname);
> +	}
> +
> +	return RTE_VHOST_MSG_RESULT_OK;
> +
> +out:
> +	return RTE_VHOST_MSG_RESULT_ERR;
> +}
> +
> +static int
>  vhost_user_iotlb_msg(struct virtio_net **pdev,
>  			struct vhu_msg_context *ctx,
>  			int main_fd __rte_unused)
> @@ -2782,6 +2863,8 @@ typedef int (*vhost_message_handler_t)(struct
> virtio_net **pdev,
>  	[VHOST_USER_NET_SET_MTU] = vhost_user_net_set_mtu,
>  	[VHOST_USER_SET_SLAVE_REQ_FD] = vhost_user_set_req_fd,
>  	[VHOST_USER_IOTLB_MSG] = vhost_user_iotlb_msg,
> +	[VHOST_USER_GET_CONFIG] = vhost_user_get_config,
> +	[VHOST_USER_SET_CONFIG] = vhost_user_set_config,
>  	[VHOST_USER_POSTCOPY_ADVISE] = vhost_user_set_postcopy_advise,
>  	[VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen,
>  	[VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end,
> diff --git a/lib/vhost/vhost_user.h b/lib/vhost/vhost_user.h
> index c946cc2..97cfb2f 100644
> --- a/lib/vhost/vhost_user.h
> +++ b/lib/vhost/vhost_user.h
> @@ -50,6 +50,8 @@
>  	VHOST_USER_NET_SET_MTU = 20,
>  	VHOST_USER_SET_SLAVE_REQ_FD = 21,
>  	VHOST_USER_IOTLB_MSG = 22,
> +	VHOST_USER_GET_CONFIG = 24,
> +	VHOST_USER_SET_CONFIG = 25,
>  	VHOST_USER_CRYPTO_CREATE_SESS = 26,
>  	VHOST_USER_CRYPTO_CLOSE_SESS = 27,
>  	VHOST_USER_POSTCOPY_ADVISE = 28,
> @@ -125,6 +127,16 @@
>  	uint16_t queue_size;
>  } VhostUserInflight;
> 
> +#define VHOST_USER_MAX_CONFIG_SIZE		256
> +
> +/** Get/set config msg payload */
> +struct vhost_user_config {
> +	uint32_t offset;
> +	uint32_t size;
> +	uint32_t flags;
> +	uint8_t region[VHOST_USER_MAX_CONFIG_SIZE];
> +};
> +
>  typedef struct VhostUserMsg {
>  	union {
>  		uint32_t master; /* a VhostUserRequest value */
> @@ -148,6 +160,7 @@
>  		VhostUserCryptoSessionParam crypto_session;
>  		VhostUserVringArea area;
>  		VhostUserInflight inflight;
> +		struct vhost_user_config cfg;
>  	} payload;
>  	/* Nothing should be added after the payload */
>  } __rte_packed VhostUserMsg;
> --
> 1.8.3.1
Andy Pei May 12, 2022, 3:50 a.m. UTC | #2
Hi Chenbo,

Thanks for your reply.

> -----Original Message-----
> From: Xia, Chenbo <chenbo.xia@intel.com>
> Sent: Wednesday, May 11, 2022 10:24 PM
> To: Pei, Andy <andy.pei@intel.com>; dev@dpdk.org
> Cc: maxime.coquelin@redhat.com; Cao, Gang <gang.cao@intel.com>; Liu,
> Changpeng <changpeng.liu@intel.com>
> Subject: RE: [PATCH v7 03/18] vhost: add vhost msg support
> 
> > -----Original Message-----
> > From: Pei, Andy <andy.pei@intel.com>
> > Sent: Wednesday, April 27, 2022 4:30 PM
> > To: dev@dpdk.org
> > Cc: Xia, Chenbo <chenbo.xia@intel.com>; maxime.coquelin@redhat.com;
> > Cao, Gang <gang.cao@intel.com>; Liu, Changpeng
> > <changpeng.liu@intel.com>
> > Subject: [PATCH v7 03/18] vhost: add vhost msg support
> 
> Title better be: vhost: add vhost msg support for get/set config
> 
Sure. 
> >
> > Add support for VHOST_USER_GET_CONFIG and
> VHOST_USER_SET_CONFIG.
> > VHOST_USER_GET_CONFIG and VHOST_USER_SET_CONFIG message is only
> > supported by virtio blk VDPA device.
> >
> > Signed-off-by: Andy Pei <andy.pei@intel.com>
> > ---
> >  lib/vhost/vhost_user.c | 83
> > ++++++++++++++++++++++++++++++++++++++++++++++++++
> >  lib/vhost/vhost_user.h | 13 ++++++++
> >  2 files changed, 96 insertions(+)
> >
> > diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c index
> > 1d39067..e925428 100644
> > --- a/lib/vhost/vhost_user.c
> > +++ b/lib/vhost/vhost_user.c
> > @@ -80,6 +80,8 @@
> >  	[VHOST_USER_NET_SET_MTU]  = "VHOST_USER_NET_SET_MTU",
> >  	[VHOST_USER_SET_SLAVE_REQ_FD]  =
> "VHOST_USER_SET_SLAVE_REQ_FD",
> >  	[VHOST_USER_IOTLB_MSG]  = "VHOST_USER_IOTLB_MSG",
> > +	[VHOST_USER_GET_CONFIG]  = "VHOST_USER_GET_CONFIG",
> > +	[VHOST_USER_SET_CONFIG]  = "VHOST_USER_SET_CONFIG",
> >  	[VHOST_USER_CRYPTO_CREATE_SESS] =
> "VHOST_USER_CRYPTO_CREATE_SESS",
> >  	[VHOST_USER_CRYPTO_CLOSE_SESS] =
> "VHOST_USER_CRYPTO_CLOSE_SESS",
> >  	[VHOST_USER_POSTCOPY_ADVISE]  =
> "VHOST_USER_POSTCOPY_ADVISE", @@
> > -2542,6 +2544,85 @@ static int is_vring_iotlb(struct virtio_net *dev,
> > }
> >
> >  static int
> > +vhost_user_get_config(struct virtio_net **pdev,
> > +			struct vhu_msg_context *ctx,
> > +			int main_fd __rte_unused)
> > +{
> > +	struct virtio_net *dev = *pdev;
> > +	struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
> > +	int ret = 0;
> > +
> > +	if (validate_msg_fds(dev, ctx, 0) != 0)
> > +		return RTE_VHOST_MSG_RESULT_ERR;
> > +
> > +	if (vdpa_dev->ops->get_config) {
> > +		ret = vdpa_dev->ops->get_config(dev->vid,
> > +					   ctx->msg.payload.cfg.region,
> > +					   ctx->msg.payload.cfg.size);
> > +		if (ret != 0) {
> > +			ctx->msg.size = 0;
> > +			VHOST_LOG_CONFIG(ERR,
> > +					 "(%s) get_config() return error!\n",
> > +					 dev->ifname);
> > +		}
> > +	} else {
> > +		VHOST_LOG_CONFIG(ERR, "(%s) get_config() not
> supported!\n",
> > +				 dev->ifname);
> > +	}
> > +
> > +	return RTE_VHOST_MSG_RESULT_REPLY;
> > +}
> > +
> > +static int
> > +vhost_user_set_config(struct virtio_net **pdev,
> > +			struct vhu_msg_context *ctx,
> > +			int main_fd __rte_unused)
> > +{
> > +	struct virtio_net *dev = *pdev;
> > +	struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
> > +	int ret = 0;
> > +
> > +	if (validate_msg_fds(dev, ctx, 0) != 0)
> > +		return RTE_VHOST_MSG_RESULT_ERR;
> > +
> > +	if (ctx->msg.size != sizeof(struct vhost_user_config)) {
> > +		VHOST_LOG_CONFIG(ERR,
> > +			"(%s) invalid set config msg size: %"PRIu32" != %d\n",
> > +			dev->ifname, ctx->msg.size,
> > +			(int)sizeof(struct vhost_user_config));
> > +		goto out;
> > +	}
> 
> Sorry, I was wrong in v6, after double check, the size can be checked in
> read_vhost_message (although not that accurate check). So we can remove
> above. (btw, even we check, the logic should Be size <= sizeof(config))
> 
> Rest of the patch seems good, thanks.
> 
> Chenbo
> 
OK. I will remove ctx->msg.size check here.
> > +
> > +	if (ctx->msg.payload.cfg.size > VHOST_USER_MAX_CONFIG_SIZE) {
> > +		VHOST_LOG_CONFIG(ERR,
> > +			"(%s) vhost_user_config size: %"PRIu32", should not
> be
> > larger than %d\n",
> > +			dev->ifname, ctx->msg.payload.cfg.size,
> > +			VHOST_USER_MAX_CONFIG_SIZE);
> > +		goto out;
> > +	}
> > +
> > +	if (vdpa_dev->ops->set_config) {
> > +		ret = vdpa_dev->ops->set_config(dev->vid,
> > +			ctx->msg.payload.cfg.region,
> > +			ctx->msg.payload.cfg.offset,
> > +			ctx->msg.payload.cfg.size,
> > +			ctx->msg.payload.cfg.flags);
> > +		if (ret)
> > +			VHOST_LOG_CONFIG(ERR,
> > +					 "(%s) set_config() return error!\n",
> > +					 dev->ifname);
> > +	} else {
> > +		VHOST_LOG_CONFIG(ERR, "(%s) set_config() not
> supported!\n",
> > +				 dev->ifname);
> > +	}
> > +
> > +	return RTE_VHOST_MSG_RESULT_OK;
> > +
> > +out:
> > +	return RTE_VHOST_MSG_RESULT_ERR;
> > +}
> > +
> > +static int
> >  vhost_user_iotlb_msg(struct virtio_net **pdev,
> >  			struct vhu_msg_context *ctx,
> >  			int main_fd __rte_unused)
> > @@ -2782,6 +2863,8 @@ typedef int (*vhost_message_handler_t)(struct
> > virtio_net **pdev,
> >  	[VHOST_USER_NET_SET_MTU] = vhost_user_net_set_mtu,
> >  	[VHOST_USER_SET_SLAVE_REQ_FD] = vhost_user_set_req_fd,
> >  	[VHOST_USER_IOTLB_MSG] = vhost_user_iotlb_msg,
> > +	[VHOST_USER_GET_CONFIG] = vhost_user_get_config,
> > +	[VHOST_USER_SET_CONFIG] = vhost_user_set_config,
> >  	[VHOST_USER_POSTCOPY_ADVISE] =
> vhost_user_set_postcopy_advise,
> >  	[VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen,
> >  	[VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end, diff --
> git
> > a/lib/vhost/vhost_user.h b/lib/vhost/vhost_user.h index
> > c946cc2..97cfb2f 100644
> > --- a/lib/vhost/vhost_user.h
> > +++ b/lib/vhost/vhost_user.h
> > @@ -50,6 +50,8 @@
> >  	VHOST_USER_NET_SET_MTU = 20,
> >  	VHOST_USER_SET_SLAVE_REQ_FD = 21,
> >  	VHOST_USER_IOTLB_MSG = 22,
> > +	VHOST_USER_GET_CONFIG = 24,
> > +	VHOST_USER_SET_CONFIG = 25,
> >  	VHOST_USER_CRYPTO_CREATE_SESS = 26,
> >  	VHOST_USER_CRYPTO_CLOSE_SESS = 27,
> >  	VHOST_USER_POSTCOPY_ADVISE = 28,
> > @@ -125,6 +127,16 @@
> >  	uint16_t queue_size;
> >  } VhostUserInflight;
> >
> > +#define VHOST_USER_MAX_CONFIG_SIZE		256
> > +
> > +/** Get/set config msg payload */
> > +struct vhost_user_config {
> > +	uint32_t offset;
> > +	uint32_t size;
> > +	uint32_t flags;
> > +	uint8_t region[VHOST_USER_MAX_CONFIG_SIZE];
> > +};
> > +
> >  typedef struct VhostUserMsg {
> >  	union {
> >  		uint32_t master; /* a VhostUserRequest value */ @@ -148,6
> +160,7 @@
> >  		VhostUserCryptoSessionParam crypto_session;
> >  		VhostUserVringArea area;
> >  		VhostUserInflight inflight;
> > +		struct vhost_user_config cfg;
> >  	} payload;
> >  	/* Nothing should be added after the payload */  } __rte_packed
> > VhostUserMsg;
> > --
> > 1.8.3.1
>
diff mbox series

Patch

diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
index 1d39067..e925428 100644
--- a/lib/vhost/vhost_user.c
+++ b/lib/vhost/vhost_user.c
@@ -80,6 +80,8 @@ 
 	[VHOST_USER_NET_SET_MTU]  = "VHOST_USER_NET_SET_MTU",
 	[VHOST_USER_SET_SLAVE_REQ_FD]  = "VHOST_USER_SET_SLAVE_REQ_FD",
 	[VHOST_USER_IOTLB_MSG]  = "VHOST_USER_IOTLB_MSG",
+	[VHOST_USER_GET_CONFIG]  = "VHOST_USER_GET_CONFIG",
+	[VHOST_USER_SET_CONFIG]  = "VHOST_USER_SET_CONFIG",
 	[VHOST_USER_CRYPTO_CREATE_SESS] = "VHOST_USER_CRYPTO_CREATE_SESS",
 	[VHOST_USER_CRYPTO_CLOSE_SESS] = "VHOST_USER_CRYPTO_CLOSE_SESS",
 	[VHOST_USER_POSTCOPY_ADVISE]  = "VHOST_USER_POSTCOPY_ADVISE",
@@ -2542,6 +2544,85 @@  static int is_vring_iotlb(struct virtio_net *dev,
 }
 
 static int
+vhost_user_get_config(struct virtio_net **pdev,
+			struct vhu_msg_context *ctx,
+			int main_fd __rte_unused)
+{
+	struct virtio_net *dev = *pdev;
+	struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
+	int ret = 0;
+
+	if (validate_msg_fds(dev, ctx, 0) != 0)
+		return RTE_VHOST_MSG_RESULT_ERR;
+
+	if (vdpa_dev->ops->get_config) {
+		ret = vdpa_dev->ops->get_config(dev->vid,
+					   ctx->msg.payload.cfg.region,
+					   ctx->msg.payload.cfg.size);
+		if (ret != 0) {
+			ctx->msg.size = 0;
+			VHOST_LOG_CONFIG(ERR,
+					 "(%s) get_config() return error!\n",
+					 dev->ifname);
+		}
+	} else {
+		VHOST_LOG_CONFIG(ERR, "(%s) get_config() not supported!\n",
+				 dev->ifname);
+	}
+
+	return RTE_VHOST_MSG_RESULT_REPLY;
+}
+
+static int
+vhost_user_set_config(struct virtio_net **pdev,
+			struct vhu_msg_context *ctx,
+			int main_fd __rte_unused)
+{
+	struct virtio_net *dev = *pdev;
+	struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
+	int ret = 0;
+
+	if (validate_msg_fds(dev, ctx, 0) != 0)
+		return RTE_VHOST_MSG_RESULT_ERR;
+
+	if (ctx->msg.size != sizeof(struct vhost_user_config)) {
+		VHOST_LOG_CONFIG(ERR,
+			"(%s) invalid set config msg size: %"PRIu32" != %d\n",
+			dev->ifname, ctx->msg.size,
+			(int)sizeof(struct vhost_user_config));
+		goto out;
+	}
+
+	if (ctx->msg.payload.cfg.size > VHOST_USER_MAX_CONFIG_SIZE) {
+		VHOST_LOG_CONFIG(ERR,
+			"(%s) vhost_user_config size: %"PRIu32", should not be larger than %d\n",
+			dev->ifname, ctx->msg.payload.cfg.size,
+			VHOST_USER_MAX_CONFIG_SIZE);
+		goto out;
+	}
+
+	if (vdpa_dev->ops->set_config) {
+		ret = vdpa_dev->ops->set_config(dev->vid,
+			ctx->msg.payload.cfg.region,
+			ctx->msg.payload.cfg.offset,
+			ctx->msg.payload.cfg.size,
+			ctx->msg.payload.cfg.flags);
+		if (ret)
+			VHOST_LOG_CONFIG(ERR,
+					 "(%s) set_config() return error!\n",
+					 dev->ifname);
+	} else {
+		VHOST_LOG_CONFIG(ERR, "(%s) set_config() not supported!\n",
+				 dev->ifname);
+	}
+
+	return RTE_VHOST_MSG_RESULT_OK;
+
+out:
+	return RTE_VHOST_MSG_RESULT_ERR;
+}
+
+static int
 vhost_user_iotlb_msg(struct virtio_net **pdev,
 			struct vhu_msg_context *ctx,
 			int main_fd __rte_unused)
@@ -2782,6 +2863,8 @@  typedef int (*vhost_message_handler_t)(struct virtio_net **pdev,
 	[VHOST_USER_NET_SET_MTU] = vhost_user_net_set_mtu,
 	[VHOST_USER_SET_SLAVE_REQ_FD] = vhost_user_set_req_fd,
 	[VHOST_USER_IOTLB_MSG] = vhost_user_iotlb_msg,
+	[VHOST_USER_GET_CONFIG] = vhost_user_get_config,
+	[VHOST_USER_SET_CONFIG] = vhost_user_set_config,
 	[VHOST_USER_POSTCOPY_ADVISE] = vhost_user_set_postcopy_advise,
 	[VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen,
 	[VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end,
diff --git a/lib/vhost/vhost_user.h b/lib/vhost/vhost_user.h
index c946cc2..97cfb2f 100644
--- a/lib/vhost/vhost_user.h
+++ b/lib/vhost/vhost_user.h
@@ -50,6 +50,8 @@ 
 	VHOST_USER_NET_SET_MTU = 20,
 	VHOST_USER_SET_SLAVE_REQ_FD = 21,
 	VHOST_USER_IOTLB_MSG = 22,
+	VHOST_USER_GET_CONFIG = 24,
+	VHOST_USER_SET_CONFIG = 25,
 	VHOST_USER_CRYPTO_CREATE_SESS = 26,
 	VHOST_USER_CRYPTO_CLOSE_SESS = 27,
 	VHOST_USER_POSTCOPY_ADVISE = 28,
@@ -125,6 +127,16 @@ 
 	uint16_t queue_size;
 } VhostUserInflight;
 
+#define VHOST_USER_MAX_CONFIG_SIZE		256
+
+/** Get/set config msg payload */
+struct vhost_user_config {
+	uint32_t offset;
+	uint32_t size;
+	uint32_t flags;
+	uint8_t region[VHOST_USER_MAX_CONFIG_SIZE];
+};
+
 typedef struct VhostUserMsg {
 	union {
 		uint32_t master; /* a VhostUserRequest value */
@@ -148,6 +160,7 @@ 
 		VhostUserCryptoSessionParam crypto_session;
 		VhostUserVringArea area;
 		VhostUserInflight inflight;
+		struct vhost_user_config cfg;
 	} payload;
 	/* Nothing should be added after the payload */
 } __rte_packed VhostUserMsg;