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From 24b8cf88f53f9fc7cb393c9cad908f759980bfee Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
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Date: Thu, 21 Jul 2022 15:38:55 +0200
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Subject: [PATCH 16/32] vhost: Track number of descs in SVQDescState
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Eugenio Pérez <eperezma@redhat.com>
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RH-MergeRequest: 108: Net Control Virtqueue shadow Support
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RH-Commit: [16/27] 26f30cb6dd35c1eb1ddabe25113431bed3d744aa (eperezmartin/qemu-kvm)
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RH-Bugzilla: 1939363
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Cindy Lu <lulu@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/1939363
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Upstream Status: git://git.qemu.org/qemu.git
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commit ac4cfdc6f39c06732d27554523f9d5f8a53b4ffa
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Author: Eugenio Pérez <eperezma@redhat.com>
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Date: Wed Jul 20 08:59:35 2022 +0200
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vhost: Track number of descs in SVQDescState
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A guest's buffer continuos on GPA may need multiple descriptors on
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qemu's VA, so SVQ should track its length sepparatedly.
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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---
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hw/virtio/vhost-shadow-virtqueue.c | 4 ++--
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hw/virtio/vhost-shadow-virtqueue.h | 6 ++++++
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2 files changed, 8 insertions(+), 2 deletions(-)
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diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c
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index a08e3d4025..4d99075e73 100644
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--- a/hw/virtio/vhost-shadow-virtqueue.c
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+++ b/hw/virtio/vhost-shadow-virtqueue.c
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@@ -257,6 +257,7 @@ static int vhost_svq_add(VhostShadowVirtqueue *svq, const struct iovec *out_sg,
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}
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svq->desc_state[qemu_head].elem = elem;
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+ svq->desc_state[qemu_head].ndescs = ndescs;
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vhost_svq_kick(svq);
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return 0;
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}
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@@ -418,8 +419,7 @@ static VirtQueueElement *vhost_svq_get_buf(VhostShadowVirtqueue *svq,
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return NULL;
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}
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- num = svq->desc_state[used_elem.id].elem->in_num +
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- svq->desc_state[used_elem.id].elem->out_num;
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+ num = svq->desc_state[used_elem.id].ndescs;
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last_used_chain = vhost_svq_last_desc_of_chain(svq, num, used_elem.id);
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svq->desc_next[last_used_chain] = svq->free_head;
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svq->free_head = used_elem.id;
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diff --git a/hw/virtio/vhost-shadow-virtqueue.h b/hw/virtio/vhost-shadow-virtqueue.h
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index d646c35054..5c7e7cbab6 100644
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--- a/hw/virtio/vhost-shadow-virtqueue.h
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+++ b/hw/virtio/vhost-shadow-virtqueue.h
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@@ -17,6 +17,12 @@
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typedef struct SVQDescState {
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VirtQueueElement *elem;
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+
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+ /*
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+ * Number of descriptors exposed to the device. May or may not match
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+ * guest's
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+ */
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+ unsigned int ndescs;
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} SVQDescState;
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/* Shadow virtqueue to relay notifications */
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--
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2.31.1
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