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From 2bdea90bfbce3b8d5bfa86178a942a470b85b835 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 07/32] vhost: move descriptor translation to
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vhost_svq_vring_write_descs
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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: [7/27] 5533c72065e4ebf8ea7db966c976a3b29bdafb82 (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 009c2549bb9dc7f7061009eb87f2a53d4b364983
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Author: Eugenio Pérez <eperezma@redhat.com>
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Date: Wed Jul 20 08:59:26 2022 +0200
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vhost: move descriptor translation to vhost_svq_vring_write_descs
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It's done for both in and out descriptors so it's better placed here.
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Acked-by: Jason Wang <jasowang@redhat.com>
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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 | 38 +++++++++++++++++++++---------
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1 file changed, 27 insertions(+), 11 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 06d0bb39d9..3fbda1e3d4 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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@@ -122,17 +122,35 @@ static bool vhost_svq_translate_addr(const VhostShadowVirtqueue *svq,
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return true;
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}
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-static void vhost_vring_write_descs(VhostShadowVirtqueue *svq, hwaddr *sg,
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- const struct iovec *iovec, size_t num,
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- bool more_descs, bool write)
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+/**
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+ * Write descriptors to SVQ vring
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+ *
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+ * @svq: The shadow virtqueue
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+ * @sg: Cache for hwaddr
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+ * @iovec: The iovec from the guest
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+ * @num: iovec length
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+ * @more_descs: True if more descriptors come in the chain
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+ * @write: True if they are writeable descriptors
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+ *
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+ * Return true if success, false otherwise and print error.
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+ */
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+static bool vhost_svq_vring_write_descs(VhostShadowVirtqueue *svq, hwaddr *sg,
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+ const struct iovec *iovec, size_t num,
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+ bool more_descs, bool write)
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{
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uint16_t i = svq->free_head, last = svq->free_head;
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unsigned n;
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uint16_t flags = write ? cpu_to_le16(VRING_DESC_F_WRITE) : 0;
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vring_desc_t *descs = svq->vring.desc;
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+ bool ok;
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if (num == 0) {
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- return;
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+ return true;
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+ }
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+
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+ ok = vhost_svq_translate_addr(svq, sg, iovec, num);
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+ if (unlikely(!ok)) {
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+ return false;
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}
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for (n = 0; n < num; n++) {
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@@ -150,6 +168,7 @@ static void vhost_vring_write_descs(VhostShadowVirtqueue *svq, hwaddr *sg,
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}
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svq->free_head = le16_to_cpu(svq->desc_next[last]);
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+ return true;
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}
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static bool vhost_svq_add_split(VhostShadowVirtqueue *svq,
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@@ -169,21 +188,18 @@ static bool vhost_svq_add_split(VhostShadowVirtqueue *svq,
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return false;
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}
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- ok = vhost_svq_translate_addr(svq, sgs, elem->out_sg, elem->out_num);
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+ ok = vhost_svq_vring_write_descs(svq, sgs, elem->out_sg, elem->out_num,
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+ elem->in_num > 0, false);
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if (unlikely(!ok)) {
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return false;
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}
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- vhost_vring_write_descs(svq, sgs, elem->out_sg, elem->out_num,
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- elem->in_num > 0, false);
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-
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- ok = vhost_svq_translate_addr(svq, sgs, elem->in_sg, elem->in_num);
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+ ok = vhost_svq_vring_write_descs(svq, sgs, elem->in_sg, elem->in_num, false,
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+ true);
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if (unlikely(!ok)) {
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return false;
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}
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- vhost_vring_write_descs(svq, sgs, elem->in_sg, elem->in_num, false, true);
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-
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/*
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* Put the entry in the available array (but don't update avail->idx until
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* they do sync).
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--
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2.31.1
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