diff mbox series

[v4,03/10] vhost: provide helpers for virtio ring relay

Message ID 20181214211612.167681-4-xiao.w.wang@intel.com (mailing list archive)
State Superseded, archived
Delegated to: Maxime Coquelin
Headers show
Series support SW assisted VDPA live migration | expand

Checks

Context Check Description
ci/checkpatch warning coding style issues
ci/Intel-compilation success Compilation OK

Commit Message

Wang, Xiao W Dec. 14, 2018, 9:16 p.m. UTC
This patch provides two helpers for vdpa device driver to perform a
relay between the guest virtio ring and a mediate virtio ring.

The available ring relay will synchronize the available entries, and
helps to do desc validity checking.

The used ring relay will synchronize the used entries from mediate ring
to guest ring, and helps to do dirty page logging for live migration.

The next patch will leverage these two helpers.

Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
---
 lib/librte_vhost/rte_vdpa.h            |  39 +++++++
 lib/librte_vhost/rte_vhost_version.map |   2 +
 lib/librte_vhost/vdpa.c                | 194 +++++++++++++++++++++++++++++++++
 lib/librte_vhost/vhost.h               |  40 +++++++
 lib/librte_vhost/virtio_net.c          |  39 -------
 5 files changed, 275 insertions(+), 39 deletions(-)

Comments

Maxime Coquelin Dec. 16, 2018, 9:10 a.m. UTC | #1
On 12/14/18 10:16 PM, Xiao Wang wrote:
> This patch provides two helpers for vdpa device driver to perform a
> relay between the guest virtio ring and a mediate virtio ring.

s/mediate/mediated/ ?
I'm not 100% sure, but if it is mediated, please change everywhere else
in the patch.

> 
> The available ring relay will synchronize the available entries, and
> helps to do desc validity checking.

s/helps/help/

> 
> The used ring relay will synchronize the used entries from mediate ring
> to guest ring, and helps to do dirty page logging for live migration.

s/helps/help/

> 
> The next patch will leverage these two helpers.
> 
> Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
> ---
>   lib/librte_vhost/rte_vdpa.h            |  39 +++++++
>   lib/librte_vhost/rte_vhost_version.map |   2 +
>   lib/librte_vhost/vdpa.c                | 194 +++++++++++++++++++++++++++++++++
>   lib/librte_vhost/vhost.h               |  40 +++++++
>   lib/librte_vhost/virtio_net.c          |  39 -------
>   5 files changed, 275 insertions(+), 39 deletions(-)
> 


Appart from that:
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime
Wang, Xiao W Dec. 17, 2018, 8:51 a.m. UTC | #2
Hi Maxime,

> -----Original Message-----
> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
> Sent: Sunday, December 16, 2018 1:11 AM
> To: Wang, Xiao W <xiao.w.wang@intel.com>; Bie, Tiwei <tiwei.bie@intel.com>
> Cc: alejandro.lucero@netronome.com; dev@dpdk.org; Wang, Zhihong
> <zhihong.wang@intel.com>; Ye, Xiaolong <xiaolong.ye@intel.com>
> Subject: Re: [PATCH v4 03/10] vhost: provide helpers for virtio ring relay
> 
> 
> 
> On 12/14/18 10:16 PM, Xiao Wang wrote:
> > This patch provides two helpers for vdpa device driver to perform a
> > relay between the guest virtio ring and a mediate virtio ring.
> 
> s/mediate/mediated/ ?
> I'm not 100% sure, but if it is mediated, please change everywhere else
> in the patch.

"mediate" can also be used as an adjective, so "mediate" is OK here.

> 
> >
> > The available ring relay will synchronize the available entries, and
> > helps to do desc validity checking.
> 
> s/helps/help/

Yes, will update.

> 
> >
> > The used ring relay will synchronize the used entries from mediate ring
> > to guest ring, and helps to do dirty page logging for live migration.
> 
> s/helps/help/

Will update.

Thanks for the comments,
Xiao

> 
> >
> > The next patch will leverage these two helpers.
> >
> > Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
> > ---
> >   lib/librte_vhost/rte_vdpa.h            |  39 +++++++
> >   lib/librte_vhost/rte_vhost_version.map |   2 +
> >   lib/librte_vhost/vdpa.c                | 194
> +++++++++++++++++++++++++++++++++
> >   lib/librte_vhost/vhost.h               |  40 +++++++
> >   lib/librte_vhost/virtio_net.c          |  39 -------
> >   5 files changed, 275 insertions(+), 39 deletions(-)
> >
> 
> 
> Appart from that:
> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> 
> Thanks,
> Maxime
Maxime Coquelin Dec. 17, 2018, 11:02 a.m. UTC | #3
Hi Xiao,

On 12/17/18 9:51 AM, Wang, Xiao W wrote:
> Hi Maxime,
> 
>> -----Original Message-----
>> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
>> Sent: Sunday, December 16, 2018 1:11 AM
>> To: Wang, Xiao W <xiao.w.wang@intel.com>; Bie, Tiwei <tiwei.bie@intel.com>
>> Cc: alejandro.lucero@netronome.com; dev@dpdk.org; Wang, Zhihong
>> <zhihong.wang@intel.com>; Ye, Xiaolong <xiaolong.ye@intel.com>
>> Subject: Re: [PATCH v4 03/10] vhost: provide helpers for virtio ring relay
>>
>>
>>
>> On 12/14/18 10:16 PM, Xiao Wang wrote:
>>> This patch provides two helpers for vdpa device driver to perform a
>>> relay between the guest virtio ring and a mediate virtio ring.
>>
>> s/mediate/mediated/ ?
>> I'm not 100% sure, but if it is mediated, please change everywhere else
>> in the patch.
> 
> "mediate" can also be used as an adjective, so "mediate" is OK here.

I got the confirmation from a native speaker that mediate sounds wrong
in this context, and mediated should be used.

>>
>>>
>>> The available ring relay will synchronize the available entries, and
>>> helps to do desc validity checking.
>>
>> s/helps/help/
> 
> Yes, will update.
> 
>>
>>>
>>> The used ring relay will synchronize the used entries from mediate ring
>>> to guest ring, and helps to do dirty page logging for live migration.
>>
>> s/helps/help/
> 
> Will update.
> 
> Thanks for the comments,
> Xiao
> 
>>
>>>
>>> The next patch will leverage these two helpers.
>>>
>>> Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
>>> ---
>>>    lib/librte_vhost/rte_vdpa.h            |  39 +++++++
>>>    lib/librte_vhost/rte_vhost_version.map |   2 +
>>>    lib/librte_vhost/vdpa.c                | 194
>> +++++++++++++++++++++++++++++++++
>>>    lib/librte_vhost/vhost.h               |  40 +++++++
>>>    lib/librte_vhost/virtio_net.c          |  39 -------
>>>    5 files changed, 275 insertions(+), 39 deletions(-)
>>>
>>
>>
>> Appart from that:
>> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>>
>> Thanks,
>> Maxime
Wang, Xiao W Dec. 17, 2018, 2:41 p.m. UTC | #4
Thanks for the confirmation.

BRs,
Xiao

> -----Original Message-----
> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
> Sent: Monday, December 17, 2018 7:03 PM
> To: Wang, Xiao W <xiao.w.wang@intel.com>; Bie, Tiwei <tiwei.bie@intel.com>
> Cc: alejandro.lucero@netronome.com; dev@dpdk.org; Wang, Zhihong
> <zhihong.wang@intel.com>; Ye, Xiaolong <xiaolong.ye@intel.com>
> Subject: Re: [PATCH v4 03/10] vhost: provide helpers for virtio ring relay
> 
> Hi Xiao,
> 
> On 12/17/18 9:51 AM, Wang, Xiao W wrote:
> > Hi Maxime,
> >
> >> -----Original Message-----
> >> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
> >> Sent: Sunday, December 16, 2018 1:11 AM
> >> To: Wang, Xiao W <xiao.w.wang@intel.com>; Bie, Tiwei
> <tiwei.bie@intel.com>
> >> Cc: alejandro.lucero@netronome.com; dev@dpdk.org; Wang, Zhihong
> >> <zhihong.wang@intel.com>; Ye, Xiaolong <xiaolong.ye@intel.com>
> >> Subject: Re: [PATCH v4 03/10] vhost: provide helpers for virtio ring relay
> >>
> >>
> >>
> >> On 12/14/18 10:16 PM, Xiao Wang wrote:
> >>> This patch provides two helpers for vdpa device driver to perform a
> >>> relay between the guest virtio ring and a mediate virtio ring.
> >>
> >> s/mediate/mediated/ ?
> >> I'm not 100% sure, but if it is mediated, please change everywhere else
> >> in the patch.
> >
> > "mediate" can also be used as an adjective, so "mediate" is OK here.
> 
> I got the confirmation from a native speaker that mediate sounds wrong
> in this context, and mediated should be used.
> 
> >>
> >>>
> >>> The available ring relay will synchronize the available entries, and
> >>> helps to do desc validity checking.
> >>
> >> s/helps/help/
> >
> > Yes, will update.
> >
> >>
> >>>
> >>> The used ring relay will synchronize the used entries from mediate ring
> >>> to guest ring, and helps to do dirty page logging for live migration.
> >>
> >> s/helps/help/
> >
> > Will update.
> >
> > Thanks for the comments,
> > Xiao
> >
> >>
> >>>
> >>> The next patch will leverage these two helpers.
> >>>
> >>> Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
> >>> ---
> >>>    lib/librte_vhost/rte_vdpa.h            |  39 +++++++
> >>>    lib/librte_vhost/rte_vhost_version.map |   2 +
> >>>    lib/librte_vhost/vdpa.c                | 194
> >> +++++++++++++++++++++++++++++++++
> >>>    lib/librte_vhost/vhost.h               |  40 +++++++
> >>>    lib/librte_vhost/virtio_net.c          |  39 -------
> >>>    5 files changed, 275 insertions(+), 39 deletions(-)
> >>>
> >>
> >>
> >> Appart from that:
> >> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> >>
> >> Thanks,
> >> Maxime
Maxime Coquelin Dec. 17, 2018, 7 p.m. UTC | #5
On 12/17/18 3:41 PM, Wang, Xiao W wrote:
> Thanks for the confirmation.

Please note that CI reports a checkpatch issue:
http://patches.dpdk.org/patch/48935/

Thanks,
Maxime

> BRs,
> Xiao
> 
>> -----Original Message-----
>> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
>> Sent: Monday, December 17, 2018 7:03 PM
>> To: Wang, Xiao W <xiao.w.wang@intel.com>; Bie, Tiwei <tiwei.bie@intel.com>
>> Cc: alejandro.lucero@netronome.com; dev@dpdk.org; Wang, Zhihong
>> <zhihong.wang@intel.com>; Ye, Xiaolong <xiaolong.ye@intel.com>
>> Subject: Re: [PATCH v4 03/10] vhost: provide helpers for virtio ring relay
>>
>> Hi Xiao,
>>
>> On 12/17/18 9:51 AM, Wang, Xiao W wrote:
>>> Hi Maxime,
>>>
>>>> -----Original Message-----
>>>> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
>>>> Sent: Sunday, December 16, 2018 1:11 AM
>>>> To: Wang, Xiao W <xiao.w.wang@intel.com>; Bie, Tiwei
>> <tiwei.bie@intel.com>
>>>> Cc: alejandro.lucero@netronome.com; dev@dpdk.org; Wang, Zhihong
>>>> <zhihong.wang@intel.com>; Ye, Xiaolong <xiaolong.ye@intel.com>
>>>> Subject: Re: [PATCH v4 03/10] vhost: provide helpers for virtio ring relay
>>>>
>>>>
>>>>
>>>> On 12/14/18 10:16 PM, Xiao Wang wrote:
>>>>> This patch provides two helpers for vdpa device driver to perform a
>>>>> relay between the guest virtio ring and a mediate virtio ring.
>>>>
>>>> s/mediate/mediated/ ?
>>>> I'm not 100% sure, but if it is mediated, please change everywhere else
>>>> in the patch.
>>>
>>> "mediate" can also be used as an adjective, so "mediate" is OK here.
>>
>> I got the confirmation from a native speaker that mediate sounds wrong
>> in this context, and mediated should be used.
>>
>>>>
>>>>>
>>>>> The available ring relay will synchronize the available entries, and
>>>>> helps to do desc validity checking.
>>>>
>>>> s/helps/help/
>>>
>>> Yes, will update.
>>>
>>>>
>>>>>
>>>>> The used ring relay will synchronize the used entries from mediate ring
>>>>> to guest ring, and helps to do dirty page logging for live migration.
>>>>
>>>> s/helps/help/
>>>
>>> Will update.
>>>
>>> Thanks for the comments,
>>> Xiao
>>>
>>>>
>>>>>
>>>>> The next patch will leverage these two helpers.
>>>>>
>>>>> Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
>>>>> ---
>>>>>     lib/librte_vhost/rte_vdpa.h            |  39 +++++++
>>>>>     lib/librte_vhost/rte_vhost_version.map |   2 +
>>>>>     lib/librte_vhost/vdpa.c                | 194
>>>> +++++++++++++++++++++++++++++++++
>>>>>     lib/librte_vhost/vhost.h               |  40 +++++++
>>>>>     lib/librte_vhost/virtio_net.c          |  39 -------
>>>>>     5 files changed, 275 insertions(+), 39 deletions(-)
>>>>>
>>>>
>>>>
>>>> Appart from that:
>>>> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>>>>
>>>> Thanks,
>>>> Maxime
Wang, Xiao W Dec. 18, 2018, 8:27 a.m. UTC | #6
Hi,

> -----Original Message-----
> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
> Sent: Tuesday, December 18, 2018 3:01 AM
> To: Wang, Xiao W <xiao.w.wang@intel.com>; Bie, Tiwei <tiwei.bie@intel.com>
> Cc: alejandro.lucero@netronome.com; dev@dpdk.org; Wang, Zhihong
> <zhihong.wang@intel.com>; Ye, Xiaolong <xiaolong.ye@intel.com>
> Subject: Re: [PATCH v4 03/10] vhost: provide helpers for virtio ring relay
> 
> 
> 
> On 12/17/18 3:41 PM, Wang, Xiao W wrote:
> > Thanks for the confirmation.
> 
> Please note that CI reports a checkpatch issue:
> http://patches.dpdk.org/patch/48935/

+ Thomas.

I've tried the checkpatch.pl from CentOS 7.4 & 7.5 and also from the latest kernel, get no warning in my
self-check with dpdk/devtools/checkpatches.sh.
I don't know what checkpatch.pl the CI uses, it depends on the DPDK_CHECKPATCH_PATH environment
variable setting. In the v5 patch, I add the __rte_experimental flag for the new API even in the vdpa.c file,
but CI still reports this warning.

BRs,
Xiao

> 
> Thanks,
> Maxime
> 
> > BRs,
> > Xiao
> >
> >> -----Original Message-----
> >> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
> >> Sent: Monday, December 17, 2018 7:03 PM
> >> To: Wang, Xiao W <xiao.w.wang@intel.com>; Bie, Tiwei
> <tiwei.bie@intel.com>
> >> Cc: alejandro.lucero@netronome.com; dev@dpdk.org; Wang, Zhihong
> >> <zhihong.wang@intel.com>; Ye, Xiaolong <xiaolong.ye@intel.com>
> >> Subject: Re: [PATCH v4 03/10] vhost: provide helpers for virtio ring relay
> >>
> >> Hi Xiao,
> >>
> >> On 12/17/18 9:51 AM, Wang, Xiao W wrote:
> >>> Hi Maxime,
> >>>
> >>>> -----Original Message-----
> >>>> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
> >>>> Sent: Sunday, December 16, 2018 1:11 AM
> >>>> To: Wang, Xiao W <xiao.w.wang@intel.com>; Bie, Tiwei
> >> <tiwei.bie@intel.com>
> >>>> Cc: alejandro.lucero@netronome.com; dev@dpdk.org; Wang, Zhihong
> >>>> <zhihong.wang@intel.com>; Ye, Xiaolong <xiaolong.ye@intel.com>
> >>>> Subject: Re: [PATCH v4 03/10] vhost: provide helpers for virtio ring relay
> >>>>
> >>>>
> >>>>
> >>>> On 12/14/18 10:16 PM, Xiao Wang wrote:
> >>>>> This patch provides two helpers for vdpa device driver to perform a
> >>>>> relay between the guest virtio ring and a mediate virtio ring.
> >>>>
> >>>> s/mediate/mediated/ ?
> >>>> I'm not 100% sure, but if it is mediated, please change everywhere else
> >>>> in the patch.
> >>>
> >>> "mediate" can also be used as an adjective, so "mediate" is OK here.
> >>
> >> I got the confirmation from a native speaker that mediate sounds wrong
> >> in this context, and mediated should be used.
> >>
> >>>>
> >>>>>
> >>>>> The available ring relay will synchronize the available entries, and
> >>>>> helps to do desc validity checking.
> >>>>
> >>>> s/helps/help/
> >>>
> >>> Yes, will update.
> >>>
> >>>>
> >>>>>
> >>>>> The used ring relay will synchronize the used entries from mediate ring
> >>>>> to guest ring, and helps to do dirty page logging for live migration.
> >>>>
> >>>> s/helps/help/
> >>>
> >>> Will update.
> >>>
> >>> Thanks for the comments,
> >>> Xiao
> >>>
> >>>>
> >>>>>
> >>>>> The next patch will leverage these two helpers.
> >>>>>
> >>>>> Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
> >>>>> ---
> >>>>>     lib/librte_vhost/rte_vdpa.h            |  39 +++++++
> >>>>>     lib/librte_vhost/rte_vhost_version.map |   2 +
> >>>>>     lib/librte_vhost/vdpa.c                | 194
> >>>> +++++++++++++++++++++++++++++++++
> >>>>>     lib/librte_vhost/vhost.h               |  40 +++++++
> >>>>>     lib/librte_vhost/virtio_net.c          |  39 -------
> >>>>>     5 files changed, 275 insertions(+), 39 deletions(-)
> >>>>>
> >>>>
> >>>>
> >>>> Appart from that:
> >>>> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> >>>>
> >>>> Thanks,
> >>>> Maxime
Thomas Monjalon Dec. 18, 2018, 8:44 a.m. UTC | #7
18/12/2018 09:27, Wang, Xiao W:
> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
> > On 12/17/18 3:41 PM, Wang, Xiao W wrote:
> > > Thanks for the confirmation.
> > 
> > Please note that CI reports a checkpatch issue:
> > http://patches.dpdk.org/patch/48935/
> 
> + Thomas.
> 
> I've tried the checkpatch.pl from CentOS 7.4 & 7.5 and also from the latest kernel, get no warning in my
> self-check with dpdk/devtools/checkpatches.sh.
> I don't know what checkpatch.pl the CI uses, it depends on the DPDK_CHECKPATCH_PATH environment
> variable setting. In the v5 patch, I add the __rte_experimental flag for the new API even in the vdpa.c file,
> but CI still reports this warning.

It required to be updated on dpdk.org.
It should be fixed now.
diff mbox series

Patch

diff --git a/lib/librte_vhost/rte_vdpa.h b/lib/librte_vhost/rte_vdpa.h
index fff657391..02b8d14ed 100644
--- a/lib/librte_vhost/rte_vdpa.h
+++ b/lib/librte_vhost/rte_vdpa.h
@@ -173,4 +173,43 @@  rte_vdpa_get_device_num(void);
  */
 int __rte_experimental
 rte_vhost_host_notifier_ctrl(int vid, bool enable);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Synchronize the available ring from guest to mediate ring, help to
+ * check desc validity to protect against malicious guest driver.
+ *
+ * @param vid
+ *  vhost device id
+ * @param qid
+ *  vhost queue id
+ * @param vring_m
+ *  mediate virtio ring pointer
+ * @return
+ *  number of synced available entries on success, -1 on failure
+ */
+int __rte_experimental
+rte_vdpa_relay_vring_avail(int vid, uint16_t qid, void *vring_m);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Synchronize the used ring from mediate ring to guest, log dirty
+ * page for each writeable buffer, caller should handle the used
+ * ring logging before device stop.
+ *
+ * @param vid
+ *  vhost device id
+ * @param qid
+ *  vhost queue id
+ * @param vring_m
+ *  mediate virtio ring pointer
+ * @return
+ *  number of synced used entries on success, -1 on failure
+ */
+int __rte_experimental
+rte_vdpa_relay_vring_used(int vid, uint16_t qid, void *vring_m);
 #endif /* _RTE_VDPA_H_ */
diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map
index 22302e972..dd3b4c1cb 100644
--- a/lib/librte_vhost/rte_vhost_version.map
+++ b/lib/librte_vhost/rte_vhost_version.map
@@ -84,4 +84,6 @@  EXPERIMENTAL {
 	rte_vhost_crypto_set_zero_copy;
 	rte_vhost_va_from_guest_pa;
 	rte_vhost_host_notifier_ctrl;
+	rte_vdpa_relay_vring_avail;
+	rte_vdpa_relay_vring_used;
 };
diff --git a/lib/librte_vhost/vdpa.c b/lib/librte_vhost/vdpa.c
index e7d849ee0..dcf6c3b8e 100644
--- a/lib/librte_vhost/vdpa.c
+++ b/lib/librte_vhost/vdpa.c
@@ -122,3 +122,197 @@  rte_vdpa_get_device_num(void)
 {
 	return vdpa_device_num;
 }
+
+static bool
+invalid_desc_check(struct virtio_net *dev, struct vhost_virtqueue *vq,
+		uint64_t desc_iova, uint64_t desc_len, uint8_t perm)
+{
+	uint64_t desc_addr, desc_chunck_len;
+
+	while (desc_len) {
+		desc_chunck_len = desc_len;
+		desc_addr = vhost_iova_to_vva(dev, vq,
+				desc_iova,
+				&desc_chunck_len,
+				perm);
+
+		if (!desc_addr)
+			return true;
+
+		desc_len -= desc_chunck_len;
+		desc_iova += desc_chunck_len;
+	}
+
+	return false;
+}
+
+int
+rte_vdpa_relay_vring_avail(int vid, uint16_t qid, void *vring_m)
+{
+	struct virtio_net *dev = get_device(vid);
+	uint16_t idx, idx_m, desc_id;
+	struct vring_desc desc;
+	struct vhost_virtqueue *vq;
+	struct vring_desc *desc_ring;
+	struct vring_desc *idesc = NULL;
+	struct vring *s_vring;
+	uint64_t dlen;
+	int ret;
+	uint8_t perm;
+
+	if (!dev || !vring_m)
+		return -1;
+
+	if (qid >= dev->nr_vring)
+		return -1;
+
+	if (vq_is_packed(dev))
+		return -1;
+
+	s_vring = (struct vring *)vring_m;
+	vq = dev->virtqueue[qid];
+	idx = vq->avail->idx;
+	idx_m = s_vring->avail->idx;
+	ret = (uint16_t)(idx - idx_m);
+
+	while (idx_m != idx) {
+		/* avail entry copy */
+		desc_id = vq->avail->ring[idx_m & (vq->size - 1)];
+		s_vring->avail->ring[idx_m & (vq->size - 1)] = desc_id;
+		desc_ring = vq->desc;
+
+		if (vq->desc[desc_id].flags & VRING_DESC_F_INDIRECT) {
+			dlen = vq->desc[desc_id].len;
+			desc_ring = (struct vring_desc *)(uintptr_t)
+				vhost_iova_to_vva(dev, vq,
+						vq->desc[desc_id].addr, &dlen,
+						VHOST_ACCESS_RO);
+			if (unlikely(!desc_ring))
+				return -1;
+
+			if (unlikely(dlen < vq->desc[idx].len)) {
+				idesc = alloc_copy_ind_table(dev, vq,
+						vq->desc[idx].addr,
+						vq->desc[idx].len);
+				if (unlikely(!idesc))
+					return -1;
+
+				desc_ring = idesc;
+			}
+
+			desc_id = 0;
+		}
+
+		/* check if the buf addr is within the guest memory */
+		do {
+			desc = desc_ring[desc_id];
+			perm = desc.flags & VRING_DESC_F_WRITE ?
+				VHOST_ACCESS_WO : VHOST_ACCESS_RO;
+			if (invalid_desc_check(dev, vq, desc.addr, desc.len,
+						perm)) {
+				if (unlikely(idesc))
+					free_ind_table(idesc);
+				return -1;
+			}
+			desc_id = desc.next;
+		} while (desc.flags & VRING_DESC_F_NEXT);
+
+		if (unlikely(idesc)) {
+			free_ind_table(idesc);
+			idesc = NULL;
+		}
+
+		idx_m++;
+	}
+
+	rte_smp_wmb();
+	s_vring->avail->idx = idx;
+
+	if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
+		vhost_avail_event(vq) = idx;
+
+	return ret;
+}
+
+int
+rte_vdpa_relay_vring_used(int vid, uint16_t qid, void *vring_m)
+{
+	struct virtio_net *dev = get_device(vid);
+	uint16_t idx, idx_m, desc_id;
+	struct vhost_virtqueue *vq;
+	struct vring_desc desc;
+	struct vring_desc *desc_ring;
+	struct vring_desc *idesc = NULL;
+	struct vring *s_vring;
+	uint64_t dlen;
+	int ret;
+
+	if (!dev || !vring_m)
+		return -1;
+
+	if (qid >= dev->nr_vring)
+		return -1;
+
+	if (vq_is_packed(dev))
+		return -1;
+
+	s_vring = (struct vring *)vring_m;
+	vq = dev->virtqueue[qid];
+	idx = vq->used->idx;
+	idx_m = s_vring->used->idx;
+	ret = (uint16_t)(idx_m - idx);
+
+	while (idx != idx_m) {
+		/* copy used entry, used ring logging is not covered here */
+		vq->used->ring[idx & (vq->size - 1)] =
+			s_vring->used->ring[idx & (vq->size - 1)];
+
+		desc_id = vq->used->ring[idx & (vq->size - 1)].id;
+		desc_ring = vq->desc;
+
+		if (vq->desc[desc_id].flags & VRING_DESC_F_INDIRECT) {
+			dlen = vq->desc[desc_id].len;
+			desc_ring = (struct vring_desc *)(uintptr_t)
+				vhost_iova_to_vva(dev, vq,
+						vq->desc[desc_id].addr, &dlen,
+						VHOST_ACCESS_RO);
+			if (unlikely(!desc_ring))
+				return -1;
+
+			if (unlikely(dlen < vq->desc[idx].len)) {
+				idesc = alloc_copy_ind_table(dev, vq,
+						vq->desc[idx].addr,
+						vq->desc[idx].len);
+				if (unlikely(!idesc))
+					return -1;
+
+				desc_ring = idesc;
+			}
+
+			desc_id = 0;
+		}
+
+		/* dirty page logging for DMA writeable buffer */
+		do {
+			desc = desc_ring[desc_id];
+			if (desc.flags & VRING_DESC_F_WRITE)
+				vhost_log_write(dev, desc.addr, desc.len);
+			desc_id = desc.next;
+		} while (desc.flags & VRING_DESC_F_NEXT);
+
+		if (unlikely(idesc)) {
+			free_ind_table(idesc);
+			idesc = NULL;
+		}
+
+		idx++;
+	}
+
+	rte_smp_wmb();
+	vq->used->idx = idx_m;
+
+	if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
+		vring_used_event(s_vring) = idx_m;
+
+	return ret;
+}
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index d5bab4803..3b3265c4b 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -18,6 +18,7 @@ 
 #include <rte_log.h>
 #include <rte_ether.h>
 #include <rte_rwlock.h>
+#include <rte_malloc.h>
 
 #include "rte_vhost.h"
 #include "rte_vdpa.h"
@@ -754,4 +755,43 @@  vhost_vring_call_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
 		eventfd_write(vq->callfd, (eventfd_t)1);
 }
 
+static __rte_always_inline void *
+alloc_copy_ind_table(struct virtio_net *dev, struct vhost_virtqueue *vq,
+		uint64_t desc_addr, uint64_t desc_len)
+{
+	void *idesc;
+	uint64_t src, dst;
+	uint64_t len, remain = desc_len;
+
+	idesc = rte_malloc(__func__, desc_len, 0);
+	if (unlikely(!idesc))
+		return 0;
+
+	dst = (uint64_t)(uintptr_t)idesc;
+
+	while (remain) {
+		len = remain;
+		src = vhost_iova_to_vva(dev, vq, desc_addr, &len,
+				VHOST_ACCESS_RO);
+		if (unlikely(!src || !len)) {
+			rte_free(idesc);
+			return 0;
+		}
+
+		rte_memcpy((void *)(uintptr_t)dst, (void *)(uintptr_t)src, len);
+
+		remain -= len;
+		dst += len;
+		desc_addr += len;
+	}
+
+	return idesc;
+}
+
+static __rte_always_inline void
+free_ind_table(void *idesc)
+{
+	rte_free(idesc);
+}
+
 #endif /* _VHOST_NET_CDEV_H_ */
diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 5e1a1a727..8c657a101 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -37,45 +37,6 @@  is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t nr_vring)
 	return (is_tx ^ (idx & 1)) == 0 && idx < nr_vring;
 }
 
-static __rte_always_inline void *
-alloc_copy_ind_table(struct virtio_net *dev, struct vhost_virtqueue *vq,
-		uint64_t desc_addr, uint64_t desc_len)
-{
-	void *idesc;
-	uint64_t src, dst;
-	uint64_t len, remain = desc_len;
-
-	idesc = rte_malloc(__func__, desc_len, 0);
-	if (unlikely(!idesc))
-		return 0;
-
-	dst = (uint64_t)(uintptr_t)idesc;
-
-	while (remain) {
-		len = remain;
-		src = vhost_iova_to_vva(dev, vq, desc_addr, &len,
-				VHOST_ACCESS_RO);
-		if (unlikely(!src || !len)) {
-			rte_free(idesc);
-			return 0;
-		}
-
-		rte_memcpy((void *)(uintptr_t)dst, (void *)(uintptr_t)src, len);
-
-		remain -= len;
-		dst += len;
-		desc_addr += len;
-	}
-
-	return idesc;
-}
-
-static __rte_always_inline void
-free_ind_table(void *idesc)
-{
-	rte_free(idesc);
-}
-
 static __rte_always_inline void
 do_flush_shadow_used_ring_split(struct virtio_net *dev,
 			struct vhost_virtqueue *vq,