This allows SVQ to add metadata to the different queue elements
Signed-off-by: Eugenio Pérez <epere...@redhat.com>
---
hw/virtio/vhost-shadow-virtqueue.h | 8 ++++--
hw/virtio/vhost-shadow-virtqueue.c | 46 ++++++++++++++++--------------
2 files changed, 31 insertions(+), 23 deletions(-)
diff --git a/hw/virtio/vhost-shadow-virtqueue.h
b/hw/virtio/vhost-shadow-virtqueue.h
index c132c994e9..f35d4b8f90 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;
/*
* Backup next field for each descriptor so we can recover securely, not
diff --git a/hw/virtio/vhost-shadow-virtqueue.c
b/hw/virtio/vhost-shadow-virtqueue.c
index f874374651..1702365475 100644
--- a/hw/virtio/vhost-shadow-virtqueue.c
+++ b/hw/virtio/vhost-shadow-virtqueue.c
@@ -159,9 +159,10 @@ 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;
@@ -203,7 +204,7 @@ 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);
@@ -252,19 +253,21 @@ 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
@@ -277,11 +280,11 @@ 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;
@@ -348,8 +351,7 @@ static uint16_t vhost_svq_last_desc_of_chain(const
VhostShadowVirtqueue *svq,
return i;
}
-static VirtQueueElement *vhost_svq_get_buf(VhostShadowVirtqueue *svq,
- uint32_t *len)
+static SVQElement *vhost_svq_get_buf(VhostShadowVirtqueue *svq, uint32_t *len)
{
const vring_used_t *used = svq->vring.used;
vring_used_elem_t used_elem;
@@ -379,8 +381,8 @@ static VirtQueueElement
*vhost_svq_get_buf(VhostShadowVirtqueue *svq,
return NULL;
}
- num = svq->ring_id_maps[used_elem.id]->in_num +
- svq->ring_id_maps[used_elem.id]->out_num;
+ num = svq->ring_id_maps[used_elem.id]->elem.in_num +
+ svq->ring_id_maps[used_elem.id]->elem.out_num;
last_used_chain = vhost_svq_last_desc_of_chain(svq, num, used_elem.id);
svq->desc_next[last_used_chain] = svq->free_head;
svq->free_head = used_elem.id;
@@ -401,11 +403,13 @@ 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",
@@ -556,7 +560,7 @@ 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);
svq->desc_next = g_new0(uint16_t, svq->vring.num);
for (unsigned i = 0; i < svq->vring.num - 1; i++) {
svq->desc_next[i] = cpu_to_le16(i + 1);
@@ -570,7 +574,7 @@ 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;
@@ -580,16 +584,16 @@ 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->desc_next);
--
2.27.0
