From: Eli Cohen <elic@nvidia.com>
To: Jason Wang <jasowang@redhat.com>
Cc: <mst@redhat.com>, <eperezma@redhat.com>, <kvm@vger.kernel.org>,
<virtualization@lists.linux-foundation.org>,
<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<lulu@redhat.com>, <eli@mellanox.com>, <lingshan.zhu@intel.com>,
<rob.miller@broadcom.com>, <stefanha@redhat.com>,
<sgarzare@redhat.com>
Subject: Re: [PATCH 10/21] vhost: support ASID in IOTLB API
Date: Tue, 29 Dec 2020 12:20:59 +0200 [thread overview]
Message-ID: <20201229102059.GB195479@mtl-vdi-166.wap.labs.mlnx> (raw)
In-Reply-To: <20201216064818.48239-11-jasowang@redhat.com>
On Wed, Dec 16, 2020 at 02:48:07PM +0800, Jason Wang wrote:
> This patches allows userspace to send ASID based IOTLB message to
> vhost. This idea is to use the reserved u32 field in the existing V2
> IOTLB message. Vhost device should advertise this capability via
> VHOST_BACKEND_F_IOTLB_ASID backend feature.
>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
> drivers/vhost/vdpa.c | 5 ++++-
> drivers/vhost/vhost.c | 23 ++++++++++++++++++-----
> drivers/vhost/vhost.h | 4 ++--
> include/uapi/linux/vhost_types.h | 5 ++++-
> 4 files changed, 28 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index 03a9b3311c6c..feb6a58df22d 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -739,7 +739,7 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
> return ret;
> }
>
> -static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
> +static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, u32 asid,
> struct vhost_iotlb_msg *msg)
> {
> struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev);
> @@ -748,6 +748,9 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
> struct vhost_iotlb *iotlb = v->iotlb;
> int r = 0;
>
> + if (asid != 0)
> + return -EINVAL;
> +
> r = vhost_dev_check_owner(dev);
> if (r)
> return r;
> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> index a262e12c6dc2..7477b724c29b 100644
> --- a/drivers/vhost/vhost.c
> +++ b/drivers/vhost/vhost.c
> @@ -468,7 +468,7 @@ void vhost_dev_init(struct vhost_dev *dev,
> struct vhost_virtqueue **vqs, int nvqs,
> int iov_limit, int weight, int byte_weight,
> bool use_worker,
> - int (*msg_handler)(struct vhost_dev *dev,
> + int (*msg_handler)(struct vhost_dev *dev, u32 asid,
> struct vhost_iotlb_msg *msg))
> {
> struct vhost_virtqueue *vq;
> @@ -1084,11 +1084,14 @@ static bool umem_access_ok(u64 uaddr, u64 size, int access)
> return true;
> }
>
> -static int vhost_process_iotlb_msg(struct vhost_dev *dev,
> +static int vhost_process_iotlb_msg(struct vhost_dev *dev, u16 asid,
> struct vhost_iotlb_msg *msg)
> {
> int ret = 0;
>
> + if (asid != 0)
> + return -EINVAL;
> +
> mutex_lock(&dev->mutex);
> vhost_dev_lock_vqs(dev);
> switch (msg->type) {
> @@ -1135,6 +1138,7 @@ ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
> struct vhost_iotlb_msg msg;
> size_t offset;
> int type, ret;
> + u16 asid = 0;
You assume asid occupies just 16 bits. So maybe you should reserve the
other 16 bits for future extension:
struct vhost_msg_v2 {
__u32 type;
- __u32 reserved;
+ __u16 asid;
+ __u16 reserved;
union {
Moreover, maybe this should be reflected in previous patches that use
the asid:
-static int mlx5_vdpa_set_map(struct vdpa_device *vdev, struct vhost_iotlb *iotlb)
+static int mlx5_vdpa_set_map(struct vdpa_device *vdev, u16 asid,
+ struct vhost_iotlb *iotlb)
-static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
+static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, u16 asid,
struct vhost_iotlb_msg *msg)
etc.
>
> ret = copy_from_iter(&type, sizeof(type), from);
> if (ret != sizeof(type)) {
> @@ -1150,7 +1154,16 @@ ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
> offset = offsetof(struct vhost_msg, iotlb) - sizeof(int);
> break;
> case VHOST_IOTLB_MSG_V2:
> - offset = sizeof(__u32);
> + if (vhost_backend_has_feature(dev->vqs[0],
> + VHOST_BACKEND_F_IOTLB_ASID)) {
> + ret = copy_from_iter(&asid, sizeof(asid), from);
> + if (ret != sizeof(asid)) {
> + ret = -EINVAL;
> + goto done;
> + }
> + offset = sizeof(__u16);
> + } else
> + offset = sizeof(__u32);
> break;
> default:
> ret = -EINVAL;
> @@ -1165,9 +1178,9 @@ ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
> }
>
> if (dev->msg_handler)
> - ret = dev->msg_handler(dev, &msg);
> + ret = dev->msg_handler(dev, asid, &msg);
> else
> - ret = vhost_process_iotlb_msg(dev, &msg);
> + ret = vhost_process_iotlb_msg(dev, asid, &msg);
> if (ret) {
> ret = -EFAULT;
> goto done;
> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
> index b063324c7669..19753a90875c 100644
> --- a/drivers/vhost/vhost.h
> +++ b/drivers/vhost/vhost.h
> @@ -162,7 +162,7 @@ struct vhost_dev {
> int byte_weight;
> u64 kcov_handle;
> bool use_worker;
> - int (*msg_handler)(struct vhost_dev *dev,
> + int (*msg_handler)(struct vhost_dev *dev, u32 asid,
> struct vhost_iotlb_msg *msg);
> };
>
> @@ -170,7 +170,7 @@ bool vhost_exceeds_weight(struct vhost_virtqueue *vq, int pkts, int total_len);
> void vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue **vqs,
> int nvqs, int iov_limit, int weight, int byte_weight,
> bool use_worker,
> - int (*msg_handler)(struct vhost_dev *dev,
> + int (*msg_handler)(struct vhost_dev *dev, u32 asid,
> struct vhost_iotlb_msg *msg));
> long vhost_dev_set_owner(struct vhost_dev *dev);
> bool vhost_dev_has_owner(struct vhost_dev *dev);
> diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h
> index 76ee7016c501..222fc66ce2ac 100644
> --- a/include/uapi/linux/vhost_types.h
> +++ b/include/uapi/linux/vhost_types.h
> @@ -87,7 +87,7 @@ struct vhost_msg {
>
> struct vhost_msg_v2 {
> __u32 type;
> - __u32 reserved;
> + __u32 asid;
> union {
> struct vhost_iotlb_msg iotlb;
> __u8 padding[64];
> @@ -157,5 +157,8 @@ struct vhost_vdpa_iova_range {
> #define VHOST_BACKEND_F_IOTLB_MSG_V2 0x1
> /* IOTLB can accept batching hints */
> #define VHOST_BACKEND_F_IOTLB_BATCH 0x2
> +/* IOTLB can accept address space identifier through V2 type of IOTLB
> + message */
> +#define VHOST_BACKEND_F_IOTLB_ASID 0x3
>
> #endif
> --
> 2.25.1
>
next prev parent reply other threads:[~2020-12-29 10:22 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-16 6:47 [PATCH 00/21] Control VQ support in vDPA Jason Wang
2020-12-16 6:47 ` [PATCH 01/21] vhost: move the backend feature bits to vhost_types.h Jason Wang
2020-12-16 6:47 ` [PATCH 02/21] virtio-vdpa: don't set callback if virtio doesn't need it Jason Wang
2020-12-16 6:48 ` [PATCH 03/21] vhost-vdpa: passing iotlb to IOMMU mapping helpers Jason Wang
2020-12-16 6:48 ` [PATCH 04/21] vhost-vdpa: switch to use vhost-vdpa specific IOTLB Jason Wang
2020-12-16 6:48 ` [PATCH 05/21] vdpa: add the missing comment for nvqs in struct vdpa_device Jason Wang
2020-12-16 6:48 ` [PATCH 06/21] vdpa: introduce virtqueue groups Jason Wang
2021-01-04 10:04 ` Stefan Hajnoczi
2021-01-05 4:13 ` Jason Wang
2020-12-16 6:48 ` [PATCH 07/21] vdpa: multiple address spaces support Jason Wang
2020-12-29 7:28 ` Eli Cohen
2020-12-30 4:00 ` Jason Wang
2020-12-30 4:04 ` Jason Wang
2020-12-30 9:44 ` Eli Cohen
2020-12-16 6:48 ` [PATCH 08/21] vdpa: introduce config operations for associating ASID to a virtqueue group Jason Wang
2020-12-16 6:48 ` [PATCH 09/21] vhost_iotlb: split out IOTLB initialization Jason Wang
2020-12-16 6:48 ` [PATCH 10/21] vhost: support ASID in IOTLB API Jason Wang
2020-12-29 10:20 ` Eli Cohen [this message]
2020-12-30 4:27 ` Jason Wang
2020-12-16 6:48 ` [PATCH 11/21] vhost-vdpa: introduce asid based IOTLB Jason Wang
2020-12-29 11:41 ` Eli Cohen
2020-12-30 6:23 ` Jason Wang
2020-12-29 11:53 ` Eli Cohen
2020-12-30 6:34 ` Jason Wang
2020-12-29 12:05 ` Eli Cohen
2020-12-30 6:33 ` Jason Wang
2020-12-16 6:48 ` [PATCH 12/21] vhost-vdpa: introduce uAPI to get the number of virtqueue groups Jason Wang
2020-12-29 12:24 ` Eli Cohen
2020-12-30 6:49 ` Jason Wang
2020-12-30 10:05 ` Eli Cohen
2020-12-31 2:36 ` Jason Wang
2020-12-16 6:48 ` [PATCH 13/21] vhost-vdpa: introduce uAPI to get the number of address spaces Jason Wang
2020-12-16 6:48 ` [PATCH 14/21] vhost-vdpa: uAPI to get virtqueue group id Jason Wang
2020-12-16 6:48 ` [PATCH 15/21] vhost-vdpa: introduce uAPI to set group ASID Jason Wang
2020-12-16 6:48 ` [PATCH 16/21] vhost-vdpa: support ASID based IOTLB API Jason Wang
2020-12-16 6:48 ` [PATCH 17/21] vdpa_sim: split vdpasim_virtqueue's iov field in out_iov and in_iov Jason Wang
2020-12-16 6:48 ` [PATCH 18/21] vdpa_sim: advertise VIRTIO_NET_F_MTU Jason Wang
2020-12-16 6:48 ` [PATCH 19/21] vdpa_sim: factor out buffer completion logic Jason Wang
2020-12-16 6:48 ` [PATCH 20/21] vdpa_sim: filter destination mac address Jason Wang
2020-12-16 6:48 ` [PATCH 21/21] vdpasim: control virtqueue support Jason Wang
2020-12-17 20:19 ` kernel test robot
2021-01-11 12:26 ` Eli Cohen
2021-01-12 3:11 ` Jason Wang
2021-01-22 19:43 ` Eugenio Perez Martin
2021-01-25 3:16 ` Jason Wang
2020-12-16 9:47 ` [PATCH 00/21] Control VQ support in vDPA Michael S. Tsirkin
2020-12-17 3:30 ` Jason Wang
2020-12-17 7:58 ` Michael S. Tsirkin
2020-12-17 9:02 ` Jason Wang
2020-12-17 22:28 ` Michael S. Tsirkin
2020-12-18 2:56 ` Jason Wang
2020-12-17 7:26 ` Eli Cohen
2022-02-24 21:22 ` [RFC PATCH v2 00/19] " Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 01/19] vhost: move the backend feature bits to vhost_types.h Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 02/19] virtio-vdpa: don't set callback if virtio doesn't need it Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 03/19] vhost-vdpa: passing iotlb to IOMMU mapping helpers Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 04/19] vhost-vdpa: switch to use vhost-vdpa specific IOTLB Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 05/19] vdpa: introduce virtqueue groups Gautam Dawar
2022-02-28 8:07 ` Jason Wang
2022-02-28 10:57 ` Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 06/19] vdpa: multiple address spaces support Gautam Dawar
2022-03-03 19:39 ` Eugenio Perez Martin
2022-03-04 6:30 ` Gautam Dawar
2022-03-04 17:45 ` Eugenio Perez Martin
2022-02-24 21:22 ` [RFC PATCH v2 07/19] vdpa: introduce config operations for associating ASID to a virtqueue group Gautam Dawar
2022-03-04 9:54 ` Eugenio Perez Martin
2022-03-04 17:48 ` Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 08/19] vhost_iotlb: split out IOTLB initialization Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 09/19] vhost: support ASID in IOTLB API Gautam Dawar
2022-03-04 10:25 ` Eugenio Perez Martin
2022-03-04 17:52 ` Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 10/19] vhost-vdpa: introduce asid based IOTLB Gautam Dawar
2022-03-04 17:56 ` Eugenio Perez Martin
2022-03-07 10:07 ` Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 11/19] vhost-vdpa: introduce uAPI to get the number of virtqueue groups Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 12/19] vhost-vdpa: introduce uAPI to get the number of address spaces Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 13/19] vhost-vdpa: uAPI to get virtqueue group id Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 14/19] vhost-vdpa: introduce uAPI to set group ASID Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 15/19] vhost-vdpa: support ASID based IOTLB API Gautam Dawar
2022-03-04 18:04 ` Eugenio Perez Martin
2022-03-07 10:23 ` Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 16/19] vdpa_sim: advertise VIRTIO_NET_F_MTU Gautam Dawar
2022-03-10 17:55 ` Eugenio Perez Martin
2022-02-24 21:22 ` [RFC PATCH v2 17/19] vdpa_sim: factor out buffer completion logic Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 18/19] vdpa_sim: filter destination mac address Gautam Dawar
2022-03-10 18:22 ` Eugenio Perez Martin
2022-02-24 21:22 ` [RFC PATCH v2 19/19] vdpasim: control virtqueue support Gautam Dawar
2022-03-10 18:20 ` Eugenio Perez Martin
2022-03-18 7:35 ` Eugenio Perez Martin
2022-03-22 8:46 ` Gautam Dawar
2022-02-28 8:17 ` [RFC PATCH v2 00/19] Control VQ support in vDPA Jason Wang
2022-02-28 10:56 ` Gautam Dawar
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