From: "Eugenio Pérez" <eperezma@redhat.com>
To: qemu-devel@nongnu.org
Cc: Lars Ganrot <lars.ganrot@gmail.com>,
virtualization@lists.linux-foundation.org,
Salil Mehta <mehta.salil.lnk@gmail.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Liran Alon <liralon@gmail.com>,
Rob Miller <rob.miller@broadcom.com>,
Max Gurtovoy <maxgu14@gmail.com>,
Alex Barba <alex.barba@broadcom.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
Jim Harford <jim.harford@broadcom.com>,
Jason Wang <jasowang@redhat.com>,
Harpreet Singh Anand <hanand@xilinx.com>,
Christophe Fontaine <cfontain@redhat.com>,
vm <vmireyno@marvell.com>, Daniel Daly <dandaly0@gmail.com>,
Michael Lilja <ml@napatech.com>,
Stefano Garzarella <sgarzare@redhat.com>,
Nitin Shrivastav <nitin.shrivastav@broadcom.com>,
Lee Ballard <ballle98@gmail.com>,
Dmytro Kazantsev <dmytro.kazantsev@gmail.com>,
Juan Quintela <quintela@redhat.com>,
kvm@vger.kernel.org, Howard Cai <howard.cai@gmail.com>,
Xiao W Wang <xiao.w.wang@intel.com>,
Sean Mooney <smooney@redhat.com>,
Parav Pandit <parav@mellanox.com>, Eli Cohen <eli@mellanox.com>,
Siwei Liu <loseweigh@gmail.com>,
Stephen Finucane <stephenfin@redhat.com>
Subject: [RFC PATCH 19/27] vhost: add vhost_vring_get_buf_rcu
Date: Fri, 20 Nov 2020 19:50:57 +0100 [thread overview]
Message-ID: <20201120185105.279030-20-eperezma@redhat.com> (raw)
In-Reply-To: <20201120185105.279030-1-eperezma@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
hw/virtio/vhost-sw-lm-ring.h | 1 +
hw/virtio/vhost-sw-lm-ring.c | 29 +++++++++++++++++++++++++++++
2 files changed, 30 insertions(+)
diff --git a/hw/virtio/vhost-sw-lm-ring.h b/hw/virtio/vhost-sw-lm-ring.h
index 03257d60c1..429a125558 100644
--- a/hw/virtio/vhost-sw-lm-ring.h
+++ b/hw/virtio/vhost-sw-lm-ring.h
@@ -19,6 +19,7 @@ typedef struct VhostShadowVirtqueue VhostShadowVirtqueue;
bool vhost_vring_kick(VhostShadowVirtqueue *vq);
int vhost_vring_add(VhostShadowVirtqueue *vq, VirtQueueElement *elem);
+VirtQueueElement *vhost_vring_get_buf_rcu(VhostShadowVirtqueue *vq, size_t sz);
/* Called within rcu_read_lock(). */
void vhost_vring_set_notification_rcu(VhostShadowVirtqueue *vq, bool enable);
diff --git a/hw/virtio/vhost-sw-lm-ring.c b/hw/virtio/vhost-sw-lm-ring.c
index 3652889d8e..4fafd1b278 100644
--- a/hw/virtio/vhost-sw-lm-ring.c
+++ b/hw/virtio/vhost-sw-lm-ring.c
@@ -187,6 +187,35 @@ int vhost_vring_add(VhostShadowVirtqueue *vq, VirtQueueElement *elem)
return 0;
}
+VirtQueueElement *vhost_vring_get_buf_rcu(VhostShadowVirtqueue *vq, size_t sz)
+{
+ const vring_used_t *used = vq->vring.used;
+ VirtQueueElement *ret;
+ vring_used_elem_t used_elem;
+ uint16_t last_used;
+
+ if (!vhost_vring_poll_rcu(vq)) {
+ return NULL;
+ }
+
+ last_used = vq->used_idx & (vq->vring.num - 1);
+ used_elem.id = virtio_tswap32(vq->vdev, used->ring[last_used].id);
+ used_elem.len = virtio_tswap32(vq->vdev, used->ring[last_used].len);
+
+ if (unlikely(used_elem.id >= vq->vring.num)) {
+ virtio_error(vq->vdev, "Device says index %u is available",
+ used_elem.id);
+ return NULL;
+ }
+
+ ret = vq->ring_id_maps[used_elem.id];
+ ret->len = used_elem.len;
+
+ vq->used_idx++;
+
+ return ret;
+}
+
void vhost_vring_write_addr(const VhostShadowVirtqueue *vq,
struct vhost_vring_addr *addr)
{
--
2.18.4
next prev parent reply other threads:[~2020-11-20 18:56 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-20 18:50 [RFC PATCH 00/27] vDPA software assisted live migration Eugenio Pérez
2020-11-20 18:50 ` [RFC PATCH 01/27] vhost: Add vhost_dev_can_log Eugenio Pérez
2020-11-20 18:50 ` [RFC PATCH 02/27] vhost: Add device callback in vhost_migration_log Eugenio Pérez
2020-12-07 16:19 ` Stefan Hajnoczi
2020-12-09 12:20 ` Eugenio Perez Martin
2020-11-20 18:50 ` [RFC PATCH 03/27] vhost: Move log resize/put to vhost_dev_set_log Eugenio Pérez
2020-11-20 18:50 ` [RFC PATCH 04/27] vhost: add vhost_kernel_set_vring_enable Eugenio Pérez
2020-12-07 16:43 ` Stefan Hajnoczi
2020-12-09 12:00 ` Eugenio Perez Martin
2020-12-09 16:08 ` Stefan Hajnoczi
2020-11-20 18:50 ` [RFC PATCH 05/27] vhost: Add hdev->dev.sw_lm_vq_handler Eugenio Pérez
2020-12-07 16:52 ` Stefan Hajnoczi
2020-12-09 15:02 ` Eugenio Perez Martin
2020-12-10 11:30 ` Stefan Hajnoczi
2020-11-20 18:50 ` [RFC PATCH 06/27] virtio: Add virtio_queue_get_used_notify_split Eugenio Pérez
2020-12-07 16:58 ` Stefan Hajnoczi
2021-01-12 18:21 ` Eugenio Perez Martin
2021-03-02 11:22 ` Stefan Hajnoczi
2021-03-02 18:34 ` Eugenio Perez Martin
2021-03-08 10:46 ` Stefan Hajnoczi
2020-11-20 18:50 ` [RFC PATCH 07/27] vhost: Route guest->host notification through qemu Eugenio Pérez
2020-12-07 17:42 ` Stefan Hajnoczi
2020-12-09 17:08 ` Eugenio Perez Martin
2020-12-10 11:50 ` Stefan Hajnoczi
2021-01-21 20:10 ` Eugenio Perez Martin
2020-11-20 18:50 ` [RFC PATCH 08/27] vhost: Add a flag for software assisted Live Migration Eugenio Pérez
2020-12-08 7:20 ` Stefan Hajnoczi
2020-12-09 17:57 ` Eugenio Perez Martin
2020-11-20 18:50 ` [RFC PATCH 09/27] vhost: Route host->guest notification through qemu Eugenio Pérez
2020-12-08 7:34 ` Stefan Hajnoczi
2020-11-20 18:50 ` [RFC PATCH 10/27] vhost: Allocate shadow vring Eugenio Pérez
2020-12-08 7:49 ` Stefan Hajnoczi
2020-12-08 8:17 ` Stefan Hajnoczi
2020-12-09 18:15 ` Eugenio Perez Martin
2020-11-20 18:50 ` [RFC PATCH 11/27] virtio: const-ify all virtio_tswap* functions Eugenio Pérez
2020-11-20 18:50 ` [RFC PATCH 12/27] virtio: Add virtio_queue_full Eugenio Pérez
2020-11-20 18:50 ` [RFC PATCH 13/27] vhost: Send buffers to device Eugenio Pérez
2020-12-08 8:16 ` Stefan Hajnoczi
2020-12-09 18:41 ` Eugenio Perez Martin
2020-12-10 11:55 ` Stefan Hajnoczi
2021-01-22 18:18 ` Eugenio Perez Martin
2020-11-20 18:50 ` [RFC PATCH 14/27] virtio: Remove virtio_queue_get_used_notify_split Eugenio Pérez
2020-11-20 18:50 ` [RFC PATCH 15/27] vhost: Do not invalidate signalled used Eugenio Pérez
2020-11-20 18:50 ` [RFC PATCH 16/27] virtio: Expose virtqueue_alloc_element Eugenio Pérez
2020-12-08 8:25 ` Stefan Hajnoczi
2020-12-09 18:46 ` Eugenio Perez Martin
2020-12-10 11:57 ` Stefan Hajnoczi
2020-11-20 18:50 ` [RFC PATCH 17/27] vhost: add vhost_vring_set_notification_rcu Eugenio Pérez
2020-11-20 18:50 ` [RFC PATCH 18/27] vhost: add vhost_vring_poll_rcu Eugenio Pérez
2020-12-08 8:41 ` Stefan Hajnoczi
2020-12-09 18:48 ` Eugenio Perez Martin
2020-11-20 18:50 ` Eugenio Pérez [this message]
2020-11-20 18:50 ` [RFC PATCH 20/27] vhost: Return used buffers Eugenio Pérez
2020-12-08 8:50 ` Stefan Hajnoczi
2020-11-20 18:50 ` [RFC PATCH 21/27] vhost: Add vhost_virtqueue_memory_unmap Eugenio Pérez
2020-11-20 18:51 ` [RFC PATCH 22/27] vhost: Add vhost_virtqueue_memory_map Eugenio Pérez
2020-11-20 18:51 ` [RFC PATCH 23/27] vhost: unmap qemu's shadow virtqueues on sw live migration Eugenio Pérez
2020-11-27 15:29 ` Stefano Garzarella
2020-11-30 7:54 ` Eugenio Perez Martin
2020-11-20 18:51 ` [RFC PATCH 24/27] vhost: iommu changes Eugenio Pérez
2020-12-08 9:02 ` Stefan Hajnoczi
2020-11-20 18:51 ` [RFC PATCH 25/27] vhost: Do not commit vhost used idx on vhost_virtqueue_stop Eugenio Pérez
2020-11-20 19:35 ` Eugenio Perez Martin
2020-11-20 18:51 ` [RFC PATCH 26/27] vhost: Add vhost_hdev_can_sw_lm Eugenio Pérez
2020-11-20 18:51 ` [RFC PATCH 27/27] vhost: forbid vhost devices logging Eugenio Pérez
2020-11-20 19:03 ` [RFC PATCH 00/27] vDPA software assisted live migration Eugenio Perez Martin
2020-11-20 19:30 ` no-reply
2020-11-25 7:08 ` Jason Wang
2020-11-25 12:03 ` Eugenio Perez Martin
2020-11-25 12:14 ` Eugenio Perez Martin
2020-11-26 3:07 ` Jason Wang
2020-11-27 15:44 ` Stefano Garzarella
2020-12-08 9:37 ` Stefan Hajnoczi
2020-12-09 9:26 ` Jason Wang
2020-12-09 15:57 ` Stefan Hajnoczi
2020-12-10 9:12 ` Jason Wang
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