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[RFC PATCH v2 08/18] vhost: Add SVQElement
From: |
Eugenio Pérez |
Subject: |
[RFC PATCH v2 08/18] vhost: Add SVQElement |
Date: |
Thu, 17 Mar 2022 19:23:49 +0100 |
This allows SVQ to add metadata to the different queue elements
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
hw/virtio/vhost-shadow-virtqueue.h | 8 ++++--
hw/virtio/vhost-shadow-virtqueue.c | 42 ++++++++++++++++--------------
2 files changed, 29 insertions(+), 21 deletions(-)
diff --git a/hw/virtio/vhost-shadow-virtqueue.h
b/hw/virtio/vhost-shadow-virtqueue.h
index e5e24c536d..72aadb0aec 100644
--- a/hw/virtio/vhost-shadow-virtqueue.h
+++ b/hw/virtio/vhost-shadow-virtqueue.h
@@ -15,6 +15,10 @@
#include "standard-headers/linux/vhost_types.h"
#include "hw/virtio/vhost-iova-tree.h"
+typedef struct SVQElement {
+ VirtQueueElement elem;
+} SVQElement;
+
/* Shadow virtqueue to relay notifications */
typedef struct VhostShadowVirtqueue {
/* Shadow vring */
@@ -48,10 +52,10 @@ typedef struct VhostShadowVirtqueue {
VhostIOVATree *iova_tree;
/* Map for use the guest's descriptors */
- VirtQueueElement **ring_id_maps;
+ SVQElement **ring_id_maps;
/* Next VirtQueue element that guest made available */
- VirtQueueElement *next_guest_avail_elem;
+ SVQElement *next_guest_avail_elem;
/* Next head to expose to the device */
uint16_t shadow_avail_idx;
diff --git a/hw/virtio/vhost-shadow-virtqueue.c
b/hw/virtio/vhost-shadow-virtqueue.c
index 349255525f..37e80c5ee0 100644
--- a/hw/virtio/vhost-shadow-virtqueue.c
+++ b/hw/virtio/vhost-shadow-virtqueue.c
@@ -158,9 +158,10 @@ static bool
vhost_svq_vring_write_descs(VhostShadowVirtqueue *svq, hwaddr *sg,
return true;
}
-static bool vhost_svq_add_split(VhostShadowVirtqueue *svq,
- VirtQueueElement *elem, unsigned *head)
+static bool vhost_svq_add_split(VhostShadowVirtqueue *svq, SVQElement
*svq_elem,
+ unsigned *head)
{
+ const VirtQueueElement *elem = &svq_elem->elem;
unsigned avail_idx;
vring_avail_t *avail = svq->vring.avail;
bool ok;
@@ -202,7 +203,7 @@ static bool vhost_svq_add_split(VhostShadowVirtqueue *svq,
return true;
}
-static bool vhost_svq_add(VhostShadowVirtqueue *svq, VirtQueueElement *elem)
+static bool vhost_svq_add(VhostShadowVirtqueue *svq, SVQElement *elem)
{
unsigned qemu_head;
bool ok = vhost_svq_add_split(svq, elem, &qemu_head);
@@ -251,19 +252,21 @@ static void vhost_handle_guest_kick(VhostShadowVirtqueue
*svq)
virtio_queue_set_notification(svq->vq, false);
while (true) {
+ SVQElement *svq_elem;
VirtQueueElement *elem;
bool ok;
if (svq->next_guest_avail_elem) {
- elem = g_steal_pointer(&svq->next_guest_avail_elem);
+ svq_elem = g_steal_pointer(&svq->next_guest_avail_elem);
} else {
- elem = virtqueue_pop(svq->vq, sizeof(*elem));
+ svq_elem = virtqueue_pop(svq->vq, sizeof(*svq_elem));
}
- if (!elem) {
+ if (!svq_elem) {
break;
}
+ elem = &svq_elem->elem;
if (elem->out_num + elem->in_num > vhost_svq_available_slots(svq))
{
/*
* This condition is possible since a contiguous buffer in GPA
@@ -276,11 +279,11 @@ static void vhost_handle_guest_kick(VhostShadowVirtqueue
*svq)
* queue the current guest descriptor and ignore further kicks
* until some elements are used.
*/
- svq->next_guest_avail_elem = elem;
+ svq->next_guest_avail_elem = svq_elem;
return;
}
- ok = vhost_svq_add(svq, elem);
+ ok = vhost_svq_add(svq, svq_elem);
if (unlikely(!ok)) {
/* VQ is broken, just return and ignore any other kicks */
return;
@@ -337,8 +340,7 @@ static void
vhost_svq_disable_notification(VhostShadowVirtqueue *svq)
svq->vring.avail->flags |= cpu_to_le16(VRING_AVAIL_F_NO_INTERRUPT);
}
-static VirtQueueElement *vhost_svq_get_buf(VhostShadowVirtqueue *svq,
- uint32_t *len)
+static SVQElement *vhost_svq_get_buf(VhostShadowVirtqueue *svq, uint32_t *len)
{
vring_desc_t *descs = svq->vring.desc;
const vring_used_t *used = svq->vring.used;
@@ -388,11 +390,13 @@ static void vhost_svq_flush(VhostShadowVirtqueue *svq,
vhost_svq_disable_notification(svq);
while (true) {
uint32_t len;
- g_autofree VirtQueueElement *elem = vhost_svq_get_buf(svq, &len);
- if (!elem) {
+ g_autofree SVQElement *svq_elem = vhost_svq_get_buf(svq, &len);
+ VirtQueueElement *elem;
+ if (!svq_elem) {
break;
}
+ elem = &svq_elem->elem;
if (unlikely(i >= svq->vring.num)) {
qemu_log_mask(LOG_GUEST_ERROR,
"More than %u used buffers obtained in a %u size SVQ",
@@ -543,7 +547,7 @@ void vhost_svq_start(VhostShadowVirtqueue *svq,
VirtIODevice *vdev,
memset(svq->vring.desc, 0, driver_size);
svq->vring.used = qemu_memalign(qemu_real_host_page_size, device_size);
memset(svq->vring.used, 0, device_size);
- svq->ring_id_maps = g_new0(VirtQueueElement *, svq->vring.num);
+ svq->ring_id_maps = g_new0(SVQElement *, svq->vring.num);
for (unsigned i = 0; i < svq->vring.num - 1; i++) {
svq->vring.desc[i].next = cpu_to_le16(i + 1);
}
@@ -556,7 +560,7 @@ void vhost_svq_start(VhostShadowVirtqueue *svq,
VirtIODevice *vdev,
void vhost_svq_stop(VhostShadowVirtqueue *svq)
{
event_notifier_set_handler(&svq->svq_kick, NULL);
- g_autofree VirtQueueElement *next_avail_elem = NULL;
+ g_autofree SVQElement *next_avail_elem = NULL;
if (!svq->vq) {
return;
@@ -566,16 +570,16 @@ void vhost_svq_stop(VhostShadowVirtqueue *svq)
vhost_svq_flush(svq, false);
for (unsigned i = 0; i < svq->vring.num; ++i) {
- g_autofree VirtQueueElement *elem = NULL;
- elem = g_steal_pointer(&svq->ring_id_maps[i]);
- if (elem) {
- virtqueue_detach_element(svq->vq, elem, 0);
+ g_autofree SVQElement *svq_elem = NULL;
+ svq_elem = g_steal_pointer(&svq->ring_id_maps[i]);
+ if (svq_elem) {
+ virtqueue_detach_element(svq->vq, &svq_elem->elem, 0);
}
}
next_avail_elem = g_steal_pointer(&svq->next_guest_avail_elem);
if (next_avail_elem) {
- virtqueue_detach_element(svq->vq, next_avail_elem, 0);
+ virtqueue_detach_element(svq->vq, &next_avail_elem->elem, 0);
}
svq->vq = NULL;
g_free(svq->ring_id_maps);
--
2.27.0
- [RFC PATCH v2 00/18] Net Control VQ support with asid in vDPA SVQ, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 01/18] vdpa: Add x-svq to NetdevVhostVDPAOptions, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 05/18] virtio-net: Expose ctrl virtqueue logic, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 02/18] vhost: move descriptor translation to vhost_svq_vring_write_descs, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 03/18] vdpa: Fix index calculus at vhost_vdpa_svqs_start, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 04/18] virtio-net: use g_memdup2() instead of unsafe g_memdup(), Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 06/18] vdpa: Extract get geatures part from vhost_vdpa_get_max_queue_pairs, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 07/18] virtio: Make virtqueue_alloc_element non-static, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 08/18] vhost: Add SVQElement,
Eugenio Pérez <=
- [RFC PATCH v2 09/18] vhost: Add custom used buffer callback, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 10/18] vdpa: control virtqueue support on shadow virtqueue, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 11/18] vhost: Add vhost_iova_tree_find, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 12/18] vdpa: Add map/unmap operation callback to SVQ, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 13/18] vhost: Add vhost_svq_inject, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 14/18] vdpa: add NetClientState->start() callback, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 15/18] vdpa: Add vhost_vdpa_start_control_svq, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 16/18] vhost: Update kernel headers, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 17/18] vdpa: Add asid attribute to vdpa device, Eugenio Pérez, 2022/03/17
- [RFC PATCH v2 18/18] vdpa: Add x-cvq-svq, Eugenio Pérez, 2022/03/17