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From 2f134d800a7ac521a637a0da2116b2603b12c8c0 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 14/23] 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: Eugenio Pérez <eperezma@redhat.com>
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RH-MergeRequest: 116: vdpa: Restore device state on destination
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RH-Bugzilla: 2114060
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RH-Acked-by: Cindy Lu <lulu@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [13/21] 93ec7baa2a29031db25d86b7dc1a949388623370 (eperezmartin/qemu-kvm)
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2114060
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Upstream status: git@github.com:jasowang/qemu.git net-next
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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 7599f71c11c08b90f173c35ded1aaa1fdca86f1b)
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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 d36afbc547..c0e3c92e96 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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