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Re: [PATCH v4 2/4] vhost-vdpa: add callback function for configure inter
From: |
Cindy Lu |
Subject: |
Re: [PATCH v4 2/4] vhost-vdpa: add callback function for configure interrupt |
Date: |
Thu, 25 Mar 2021 15:17:18 +0800 |
On Wed, Mar 24, 2021 at 2:35 PM Jason Wang <jasowang@redhat.com> wrote:
>
>
> 在 2021/3/23 上午9:56, Cindy Lu 写道:
> > Add call back function for configure interrupt.
> > Set the notifier's fd to the kernel driver when vdpa start.
> > also set -1 while vdpa stop. then the kernel will release
> > the related resource
> >
> > Signed-off-by: Cindy Lu <lulu@redhat.com>
> > ---
> > hw/virtio/trace-events | 2 ++
> > hw/virtio/vhost-vdpa.c | 40 +++++++++++++++++++++++++++++--
> > include/hw/virtio/vhost-backend.h | 4 ++++
> > 3 files changed, 44 insertions(+), 2 deletions(-)
> >
> > diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
> > index 2060a144a2..6710835b46 100644
> > --- a/hw/virtio/trace-events
> > +++ b/hw/virtio/trace-events
> > @@ -52,6 +52,8 @@ vhost_vdpa_set_vring_call(void *dev, unsigned int index,
> > int fd) "dev: %p index:
> > vhost_vdpa_get_features(void *dev, uint64_t features) "dev: %p features:
> > 0x%"PRIx64
> > vhost_vdpa_set_owner(void *dev) "dev: %p"
> > vhost_vdpa_vq_get_addr(void *dev, void *vq, uint64_t desc_user_addr,
> > uint64_t avail_user_addr, uint64_t used_user_addr) "dev: %p vq: %p
> > desc_user_addr: 0x%"PRIx64" avail_user_addr: 0x%"PRIx64" used_user_addr:
> > 0x%"PRIx64
> > +vhost_vdpa_set_config_call(void *dev, int *fd)"dev: %p fd: %p"
> > +
> >
> > # virtio.c
> > virtqueue_alloc_element(void *elem, size_t sz, unsigned in_num, unsigned
> > out_num) "elem %p size %zd in_num %u out_num %u"
> > diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
> > index 01d2101d09..bde32eefe7 100644
> > --- a/hw/virtio/vhost-vdpa.c
> > +++ b/hw/virtio/vhost-vdpa.c
> > @@ -467,20 +467,47 @@ static int vhost_vdpa_get_config(struct vhost_dev
> > *dev, uint8_t *config,
> > }
> > return ret;
> > }
> > -
> > +static void vhost_vdpa_config_notify_start(struct vhost_dev *dev,
> > + struct VirtIODevice *vdev, bool start)
> > +{
> > + int fd = 0;
> > + int r = 0;
> > + if (!(dev->features & (0x1ULL << VIRTIO_NET_F_STATUS))) {
> > + return;
> > + }
> > + if (start) {
> > + fd = event_notifier_get_fd(&vdev->config_notifier);
> > + r = dev->vhost_ops->vhost_set_config_call(dev, &fd);
> > + /*set the fd call back to vdpa driver*/
> > + if (!r) {
> > + vdev->use_config_notifier = VIRTIO_CONFIG_WORK;
> > + event_notifier_set(&vdev->config_notifier);
>
>
> Is this a workaround for the vdpa device without config interrupt? I
> wonder how much we could gain from this.
>
this is a bit identify if the config notifier working now, this bit to check in
virtio bus for different behavior , I will change this bit 's name to
make it more clearly
>
> > + info_report("vhost_vdpa_config_notify start!");
>
>
> This is a debug code I guess.
>
sure I will remove this
>
> > + }
> > + } else {
> > + fd = -1;
> > + vdev->use_config_notifier = VIRTIO_CONFIG_STOP;
>
>
> Looks like a duplicated state with vhost_dev->started?
>
>
> > + r = dev->vhost_ops->vhost_set_config_call(dev, &fd);
> > + }
> > + return;
> > +}
> > static int vhost_vdpa_dev_start(struct vhost_dev *dev, bool started)
> > {
> > struct vhost_vdpa *v = dev->opaque;
> > trace_vhost_vdpa_dev_start(dev, started);
> > + VirtIODevice *vdev = dev->vdev;
> > +
> > if (started) {
> > uint8_t status = 0;
> > memory_listener_register(&v->listener, &address_space_memory);
> > vhost_vdpa_set_vring_ready(dev);
> > vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
> > vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &status);
> > -
> > + /*set the configure interrupt call back*/
> > + vhost_vdpa_config_notify_start(dev, vdev, true);
> > return !(status & VIRTIO_CONFIG_S_DRIVER_OK);
> > } else {
> > + vhost_vdpa_config_notify_start(dev, vdev, false);
> > vhost_vdpa_reset_device(dev);
> > vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE |
> > VIRTIO_CONFIG_S_DRIVER);
> > @@ -546,6 +573,14 @@ static int vhost_vdpa_set_vring_call(struct vhost_dev
> > *dev,
> > return vhost_vdpa_call(dev, VHOST_SET_VRING_CALL, file);
> > }
> >
> > +static int vhost_vdpa_set_config_call(struct vhost_dev *dev,
> > + int *fd)
> > +{
> > + trace_vhost_vdpa_set_config_call(dev, fd);
> > +
> > + return vhost_vdpa_call(dev, VHOST_VDPA_SET_CONFIG_CALL, fd);
> > +}
> > +
> > static int vhost_vdpa_get_features(struct vhost_dev *dev,
> > uint64_t *features)
> > {
> > @@ -611,4 +646,5 @@ const VhostOps vdpa_ops = {
> > .vhost_get_device_id = vhost_vdpa_get_device_id,
> > .vhost_vq_get_addr = vhost_vdpa_vq_get_addr,
> > .vhost_force_iommu = vhost_vdpa_force_iommu,
> > + .vhost_set_config_call = vhost_vdpa_set_config_call,
> > };
> > diff --git a/include/hw/virtio/vhost-backend.h
> > b/include/hw/virtio/vhost-backend.h
> > index 8a6f8e2a7a..1a2fee8994 100644
> > --- a/include/hw/virtio/vhost-backend.h
> > +++ b/include/hw/virtio/vhost-backend.h
>
>
> A separated patch please.
>
> Thanks
>
sure will split this
>
> > @@ -125,6 +125,9 @@ typedef int (*vhost_get_device_id_op)(struct vhost_dev
> > *dev, uint32_t *dev_id);
> >
> > typedef bool (*vhost_force_iommu_op)(struct vhost_dev *dev);
> >
> > +typedef int (*vhost_set_config_call_op)(struct vhost_dev *dev,
> > + int *fd);
> > +
> > typedef struct VhostOps {
> > VhostBackendType backend_type;
> > vhost_backend_init vhost_backend_init;
> > @@ -170,6 +173,7 @@ typedef struct VhostOps {
> > vhost_vq_get_addr_op vhost_vq_get_addr;
> > vhost_get_device_id_op vhost_get_device_id;
> > vhost_force_iommu_op vhost_force_iommu;
> > + vhost_set_config_call_op vhost_set_config_call;
> > } VhostOps;
> >
> > extern const VhostOps user_ops;
>
>