From: Eugenio Perez Martin <eperezma@redhat.com>
To: Gautam Dawar <gautam.dawar@xilinx.com>
Cc: Gautam Dawar <gdawar@xilinx.com>,
Martin Petrus Hubertus Habets <martinh@xilinx.com>,
Harpreet Singh Anand <hanand@xilinx.com>,
Tanuj Murlidhar Kamde <tanujk@xilinx.com>,
Jason Wang <jasowang@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Zhu Lingshan <lingshan.zhu@intel.com>,
Stefano Garzarella <sgarzare@redhat.com>,
Xie Yongji <xieyongji@bytedance.com>, Eli Cohen <elic@nvidia.com>,
Si-Wei Liu <si-wei.liu@oracle.com>,
Parav Pandit <parav@nvidia.com>, Longpeng <longpeng2@huawei.com>,
virtualization <virtualization@lists.linux-foundation.org>,
linux-kernel@vger.kernel.org, kvm list <kvm@vger.kernel.org>,
netdev@vger.kernel.org
Subject: Re: [RFC PATCH v2 10/19] vhost-vdpa: introduce asid based IOTLB
Date: Fri, 4 Mar 2022 18:56:19 +0100 [thread overview]
Message-ID: <CAJaqyWfyEJMAkJhXhi5fF1WxfKqujoeZmemSJJPrvCTDCjCpew@mail.gmail.com> (raw)
In-Reply-To: <20220224212314.1326-11-gdawar@xilinx.com>
On Thu, Feb 24, 2022 at 10:26 PM Gautam Dawar <gautam.dawar@xilinx.com> wrote:
>
> This patch converts the vhost-vDPA device to support multiple IOTLBs
> tagged via ASID via hlist. This will be used for supporting multiple
> address spaces in the following patches.
>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> Signed-off-by: Gautam Dawar <gdawar@xilinx.com>
> ---
> drivers/vhost/vdpa.c | 104 ++++++++++++++++++++++++++++++++-----------
> 1 file changed, 79 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index d0aacc0cc79a..4e8b7c4809cd 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -33,13 +33,21 @@ enum {
>
> #define VHOST_VDPA_DEV_MAX (1U << MINORBITS)
>
> +#define VHOST_VDPA_IOTLB_BUCKETS 16
> +
> +struct vhost_vdpa_as {
> + struct hlist_node hash_link;
> + struct vhost_iotlb iotlb;
> + u32 id;
> +};
> +
> struct vhost_vdpa {
> struct vhost_dev vdev;
> struct iommu_domain *domain;
> struct vhost_virtqueue *vqs;
> struct completion completion;
> struct vdpa_device *vdpa;
> - struct vhost_iotlb *iotlb;
> + struct hlist_head as[VHOST_VDPA_IOTLB_BUCKETS];
> struct device dev;
> struct cdev cdev;
> atomic_t opened;
> @@ -49,12 +57,64 @@ struct vhost_vdpa {
> struct eventfd_ctx *config_ctx;
> int in_batch;
> struct vdpa_iova_range range;
> + int used_as;
This member is only modified to count the number of AS, but is never
read again. In patch 15/19 is deleted. Could we avoid introducing it
in all the series?
This is also in the previous series, but it was declared useless if I
recall correctly.
> };
>
> static DEFINE_IDA(vhost_vdpa_ida);
>
> static dev_t vhost_vdpa_major;
>
> +static struct vhost_vdpa_as *asid_to_as(struct vhost_vdpa *v, u32 asid)
> +{
> + struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS];
> + struct vhost_vdpa_as *as;
> +
> + hlist_for_each_entry(as, head, hash_link)
> + if (as->id == asid)
> + return as;
> +
> + return NULL;
> +}
> +
> +static struct vhost_vdpa_as *vhost_vdpa_alloc_as(struct vhost_vdpa *v, u32 asid)
> +{
> + struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS];
> + struct vhost_vdpa_as *as;
> +
> + if (asid_to_as(v, asid))
> + return NULL;
> +
> + as = kmalloc(sizeof(*as), GFP_KERNEL);
> + if (!as)
> + return NULL;
> +
> + vhost_iotlb_init(&as->iotlb, 0, 0);
> + as->id = asid;
> + hlist_add_head(&as->hash_link, head);
> + ++v->used_as;
> +
> + return as;
> +}
> +
> +static int vhost_vdpa_remove_as(struct vhost_vdpa *v, u32 asid)
> +{
> + struct vhost_vdpa_as *as = asid_to_as(v, asid);
> +
> + /* Remove default address space is not allowed */
> + if (asid == 0)
> + return -EINVAL;
We must remove address space id 0 so we don't leak it at
vhost_vdpa_cleanup. I think the check could go away with no need of
moving it.
> +
> + if (!as)
> + return -EINVAL;
> +
> + hlist_del(&as->hash_link);
> + vhost_iotlb_reset(&as->iotlb);
> + kfree(as);
> + --v->used_as;
> +
> + return 0;
> +}
> +
> static void handle_vq_kick(struct vhost_work *work)
> {
> struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
> @@ -554,15 +614,6 @@ static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v,
> return vhost_vdpa_pa_unmap(v, iotlb, start, last);
> }
>
> -static void vhost_vdpa_iotlb_free(struct vhost_vdpa *v)
> -{
> - struct vhost_iotlb *iotlb = v->iotlb;
> -
> - vhost_vdpa_iotlb_unmap(v, iotlb, 0ULL, 0ULL - 1);
> - kfree(v->iotlb);
> - v->iotlb = NULL;
> -}
> -
> static int perm_to_iommu_flags(u32 perm)
> {
> int flags = 0;
> @@ -842,7 +893,8 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, u32 asid,
> 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;
> - struct vhost_iotlb *iotlb = v->iotlb;
> + struct vhost_vdpa_as *as = asid_to_as(v, 0);
> + struct vhost_iotlb *iotlb = &as->iotlb;
> int r = 0;
>
> mutex_lock(&dev->mutex);
> @@ -953,6 +1005,13 @@ static void vhost_vdpa_set_iova_range(struct vhost_vdpa *v)
> }
> }
>
> +static void vhost_vdpa_cleanup(struct vhost_vdpa *v)
> +{
> + vhost_dev_cleanup(&v->vdev);
> + kfree(v->vdev.vqs);
> + vhost_vdpa_remove_as(v, 0);
> +}
> +
> static int vhost_vdpa_open(struct inode *inode, struct file *filep)
> {
> struct vhost_vdpa *v;
> @@ -985,15 +1044,12 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep)
> vhost_dev_init(dev, vqs, nvqs, 0, 0, 0, false,
> vhost_vdpa_process_iotlb_msg);
>
> - v->iotlb = vhost_iotlb_alloc(0, 0);
> - if (!v->iotlb) {
> - r = -ENOMEM;
> - goto err_init_iotlb;
> - }
> + if (!vhost_vdpa_alloc_as(v, 0))
> + goto err_alloc_as;
>
> r = vhost_vdpa_alloc_domain(v);
> if (r)
> - goto err_alloc_domain;
> + goto err_alloc_as;
>
> vhost_vdpa_set_iova_range(v);
>
> @@ -1001,11 +1057,8 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep)
>
> return 0;
>
> -err_alloc_domain:
> - vhost_vdpa_iotlb_free(v);
> -err_init_iotlb:
> - vhost_dev_cleanup(&v->vdev);
> - kfree(vqs);
> +err_alloc_as:
> + vhost_vdpa_cleanup(v);
> err:
> atomic_dec(&v->opened);
> return r;
> @@ -1029,11 +1082,9 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep)
> vhost_vdpa_clean_irq(v);
> vhost_vdpa_reset(v);
> vhost_dev_stop(&v->vdev);
> - vhost_vdpa_iotlb_free(v);
> vhost_vdpa_free_domain(v);
> vhost_vdpa_config_put(v);
> vhost_dev_cleanup(&v->vdev);
> - kfree(v->vdev.vqs);
> mutex_unlock(&d->mutex);
>
> atomic_dec(&v->opened);
> @@ -1129,7 +1180,7 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
> const struct vdpa_config_ops *ops = vdpa->config;
> struct vhost_vdpa *v;
> int minor;
> - int r;
> + int i, r;
>
> /* Only support 1 address space and 1 groups */
> if (vdpa->ngroups != 1 || vdpa->nas != 1)
> @@ -1177,6 +1228,9 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
> init_completion(&v->completion);
> vdpa_set_drvdata(vdpa, v);
>
> + for (i = 0; i < VHOST_VDPA_IOTLB_BUCKETS; i++)
> + INIT_HLIST_HEAD(&v->as[i]);
> +
> return 0;
>
> err:
> --
> 2.25.0
>
next prev parent reply other threads:[~2022-03-04 17:57 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
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 [this message]
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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