From: Eli Cohen <eli@mellanox.com>
To: mst@redhat.com, jasowang@redhat.com,
virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org
Cc: shahafs@mellanox.com, saeedm@mellanox.com, parav@mellanox.com
Subject: [PATCH V4 linux-next 04/12] vhost-vdpa: support IOTLB batching hints
Date: Tue, 4 Aug 2020 19:20:40 +0300 [thread overview]
Message-ID: <20200804162048.22587-5-eli@mellanox.com> (raw)
In-Reply-To: <20200804162048.22587-1-eli@mellanox.com>
From: Jason Wang <jasowang@redhat.com>
This patches extend the vhost IOTLB API to accept batch updating hints
form userspace. When userspace wants update the device IOTLB in a
batch, it may do:
1) Write vhost_iotlb_msg with VHOST_IOTLB_BATCH_BEGIN flag
2) Perform a batch of IOTLB updating via VHOST_IOTLB_UPDATE/INVALIDATE
3) Write vhost_iotlb_msg with VHOST_IOTLB_BATCH_END flag
Vhost-vdpa may decide to batch the IOMMU/IOTLB updating in step 3 when
vDPA device support set_map() ops. This is useful for the vDPA device
that want to know all the mappings to tweak their own DMA translation
logic.
For vDPA device that doesn't require set_map(), no behavior changes.
This capability is advertised via VHOST_BACKEND_F_IOTLB_BATCH capability.
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/vhost/vdpa.c | 36 ++++++++++++++++++++++++--------
include/uapi/linux/vhost.h | 2 ++
include/uapi/linux/vhost_types.h | 11 ++++++++++
3 files changed, 40 insertions(+), 9 deletions(-)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 2f0310d1b914..0a143615e69d 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -27,7 +27,9 @@
#include "vhost.h"
enum {
- VHOST_VDPA_BACKEND_FEATURES = (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2)
+ VHOST_VDPA_BACKEND_FEATURES =
+ (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2) |
+ (1ULL << VHOST_BACKEND_F_IOTLB_BATCH),
};
/* Currently, only network backend w/o multiqueue is supported. */
@@ -48,6 +50,7 @@ struct vhost_vdpa {
int virtio_id;
int minor;
struct eventfd_ctx *config_ctx;
+ int in_batch;
};
static DEFINE_IDA(vhost_vdpa_ida);
@@ -140,6 +143,7 @@ static void vhost_vdpa_reset(struct vhost_vdpa *v)
struct vdpa_device *vdpa = v->vdpa;
vdpa_reset(vdpa);
+ v->in_batch = 0;
}
static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp)
@@ -563,13 +567,15 @@ static int vhost_vdpa_map(struct vhost_vdpa *v,
if (r)
return r;
- if (ops->dma_map)
+ if (ops->dma_map) {
r = ops->dma_map(vdpa, iova, size, pa, perm);
- else if (ops->set_map)
- r = ops->set_map(vdpa, dev->iotlb);
- else
+ } else if (ops->set_map) {
+ if (!v->in_batch)
+ r = ops->set_map(vdpa, dev->iotlb);
+ } else {
r = iommu_map(v->domain, iova, pa, size,
perm_to_iommu_flags(perm));
+ }
return r;
}
@@ -582,12 +588,14 @@ static void vhost_vdpa_unmap(struct vhost_vdpa *v, u64 iova, u64 size)
vhost_vdpa_iotlb_unmap(v, iova, iova + size - 1);
- if (ops->dma_map)
+ if (ops->dma_map) {
ops->dma_unmap(vdpa, iova, size);
- else if (ops->set_map)
- ops->set_map(vdpa, dev->iotlb);
- else
+ } else if (ops->set_map) {
+ if (!v->in_batch)
+ ops->set_map(vdpa, dev->iotlb);
+ } else {
iommu_unmap(v->domain, iova, size);
+ }
}
static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
@@ -680,6 +688,8 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
struct vhost_iotlb_msg *msg)
{
struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev);
+ struct vdpa_device *vdpa = v->vdpa;
+ const struct vdpa_config_ops *ops = vdpa->config;
int r = 0;
r = vhost_dev_check_owner(dev);
@@ -693,6 +703,14 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
case VHOST_IOTLB_INVALIDATE:
vhost_vdpa_unmap(v, msg->iova, msg->size);
break;
+ case VHOST_IOTLB_BATCH_BEGIN:
+ v->in_batch = true;
+ break;
+ case VHOST_IOTLB_BATCH_END:
+ if (v->in_batch && ops->set_map)
+ ops->set_map(vdpa, dev->iotlb);
+ v->in_batch = false;
+ break;
default:
r = -EINVAL;
break;
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index 5d9254e2a6b6..11a4948b6216 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -91,6 +91,8 @@
/* Use message type V2 */
#define VHOST_BACKEND_F_IOTLB_MSG_V2 0x1
+/* IOTLB can accept batching hints */
+#define VHOST_BACKEND_F_IOTLB_BATCH 0x2
#define VHOST_SET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x25, __u64)
#define VHOST_GET_BACKEND_FEATURES _IOR(VHOST_VIRTIO, 0x26, __u64)
diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h
index 669457ce5c48..9a269a88a6ff 100644
--- a/include/uapi/linux/vhost_types.h
+++ b/include/uapi/linux/vhost_types.h
@@ -60,6 +60,17 @@ struct vhost_iotlb_msg {
#define VHOST_IOTLB_UPDATE 2
#define VHOST_IOTLB_INVALIDATE 3
#define VHOST_IOTLB_ACCESS_FAIL 4
+/*
+ * VHOST_IOTLB_BATCH_BEGIN and VHOST_IOTLB_BATCH_END allow modifying
+ * multiple mappings in one go: beginning with
+ * VHOST_IOTLB_BATCH_BEGIN, followed by any number of
+ * VHOST_IOTLB_UPDATE messages, and ending with VHOST_IOTLB_BATCH_END.
+ * When one of these two values is used as the message type, the rest
+ * of the fields in the message are ignored. There's no guarantee that
+ * these changes take place automatically in the device.
+ */
+#define VHOST_IOTLB_BATCH_BEGIN 5
+#define VHOST_IOTLB_BATCH_END 6
__u8 type;
};
--
2.26.0
next prev parent reply other threads:[~2020-08-04 16:24 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-04 16:20 [PATCH V4 linux-next 00/12] VDPA support for Mellanox ConnectX devices Eli Cohen
2020-08-04 16:20 ` [PATCH V4 linux-next 01/12] vhost-vdpa: refine ioctl pre-processing Eli Cohen
2020-08-04 16:20 ` [PATCH V4 linux-next 02/12] vhost: generialize backend features setting/getting Eli Cohen
2020-08-04 16:20 ` [PATCH V4 linux-next 03/12] vhost-vdpa: support get/set backend features Eli Cohen
2020-08-04 16:20 ` Eli Cohen [this message]
2020-08-04 16:20 ` [PATCH V4 linux-next 05/12] vdpasim: support batch updating Eli Cohen
2020-08-04 16:20 ` [PATCH V4 linux-next 06/12] vdpa: remove hard coded virtq num Eli Cohen
2020-08-04 16:20 ` [PATCH V4 linux-next 07/12] net/vdpa: Use struct for set/get vq state Eli Cohen
2020-08-04 16:20 ` [PATCH V4 linux-next 08/12] vdpa: Modify get_vq_state() to return error code Eli Cohen
2020-08-05 8:10 ` Jason Wang
2020-08-04 16:20 ` [PATCH V4 linux-next 09/12] vdpa/mlx5: Add hardware descriptive header file Eli Cohen
2020-08-04 16:20 ` [PATCH V4 linux-next 10/12] vdpa/mlx5: Add support library for mlx5 VDPA implementation Eli Cohen
2020-08-04 16:20 ` [PATCH V4 linux-next 11/12] vdpa/mlx5: Add shared memory registration code Eli Cohen
2020-08-04 16:20 ` [PATCH V4 linux-next 12/12] vdpa/mlx5: Add VDPA driver for supported mlx5 devices Eli Cohen
2020-08-05 8:09 ` Jason Wang
2020-08-04 21:29 ` [PATCH V4 linux-next 00/12] VDPA support for Mellanox ConnectX devices Michael S. Tsirkin
2020-08-05 5:01 ` Eli Cohen
2020-08-05 8:12 ` Jason Wang
2020-08-05 8:18 ` Eli Cohen
2020-08-05 8:11 ` Jason Wang
2020-08-05 12:00 ` Michael S. Tsirkin
2020-08-05 12:40 ` Eli Cohen
2020-08-05 12:48 ` Michael S. Tsirkin
2020-08-05 13:01 ` Eli Cohen
2020-08-05 13:12 ` Michael S. Tsirkin
2020-08-05 19:01 ` Saeed Mahameed
2020-08-05 19:46 ` Jason Gunthorpe
2020-08-05 22:31 ` Michael S. Tsirkin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200804162048.22587-5-eli@mellanox.com \
--to=eli@mellanox.com \
--cc=jasowang@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mst@redhat.com \
--cc=parav@mellanox.com \
--cc=saeedm@mellanox.com \
--cc=shahafs@mellanox.com \
--cc=virtualization@lists.linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).