64 lines
2.1 KiB
Diff
64 lines
2.1 KiB
Diff
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From 39659fb33b282188f005ba26bd2c40ce8b7a173c 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: Tue, 23 Aug 2022 20:30:29 +0200
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Subject: [PATCH 11/29] vhost: Do not depend on !NULL VirtQueueElement on
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vhost_svq_flush
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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: Laurent Vivier <lvivier@redhat.com>
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RH-MergeRequest: 117: vDPA SVQ Multiqueue support
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RH-Jira: RHELX-57
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RH-Acked-by: Jason Wang <jasowang@redhat.com>
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RH-Acked-by: Cindy Lu <lulu@redhat.com>
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RH-Acked-by: Eugenio Pérez <eperezma@redhat.com>
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RH-Commit: [11/25] 2fec9b6bb72cf8ef42d08a28df3dc8b540f6f43f (redhat/centos-stream/src/qemu-kvm)
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Since QEMU will be able to inject new elements on CVQ to restore the
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state, we need not to depend on a VirtQueueElement to know if a new
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element has been used by the device or not. Instead of check that, check
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if there are new elements only using used idx on vhost_svq_flush.
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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Acked-by: Jason Wang <jasowang@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit d368c0b052ad95d3bf4fcc5a5d25715a35c91d4b)
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Signed-off-by: Laurent Vivier <lvivier@redhat.com>
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---
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hw/virtio/vhost-shadow-virtqueue.c | 11 +++++++----
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1 file changed, 7 insertions(+), 4 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 8df5296f24..e8e5bbc368 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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@@ -499,17 +499,20 @@ static void vhost_svq_flush(VhostShadowVirtqueue *svq,
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size_t vhost_svq_poll(VhostShadowVirtqueue *svq)
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{
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int64_t start_us = g_get_monotonic_time();
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+ uint32_t len;
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+
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do {
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- uint32_t len;
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- VirtQueueElement *elem = vhost_svq_get_buf(svq, &len);
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- if (elem) {
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- return len;
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+ if (vhost_svq_more_used(svq)) {
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+ break;
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}
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if (unlikely(g_get_monotonic_time() - start_us > 10e6)) {
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return 0;
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}
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} while (true);
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+
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+ vhost_svq_get_buf(svq, &len);
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+ return len;
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}
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/**
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--
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2.31.1
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