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From d7c69df61c216de014aca9d1eafc94ddb81ce5bb Mon Sep 17 00:00:00 2001
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From: Xiao Wang <jasowang@redhat.com>
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Date: Wed, 29 Nov 2017 07:39:51 +0100
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Subject: [PATCH 17/21] virtio-net: don't touch virtqueue if vm is stopped
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RH-Author: Xiao Wang <jasowang@redhat.com>
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Message-id: <1511941191-30204-1-git-send-email-jasowang@redhat.com>
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Patchwork-id: 77949
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O-Subject: [RHV7.5 qemu-kvm-rhev PATCH] virtio-net: don't touch virtqueue if vm is stopped
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Bugzilla: 1506151
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Pankaj Gupta <pagupta@redhat.com>
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RH-Acked-by: wexu@redhat.com
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1506151
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Brew Build: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=14645237
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Test status: Tested by myself
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Guest state should not be touched if VM is stopped, unfortunately we
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didn't check running state and tried to drain tx queue unconditionally
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in virtio_net_set_status(). A crash was then noticed as a migration
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destination when user type quit after virtqueue state is loaded but
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before region cache is initialized. In this case,
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virtio_net_drop_tx_queue_data() tries to access the uninitialized
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region cache.
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Fix this by only dropping tx queue data when vm is running.
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Fixes: 283e2c2adcb80 ("net: virtio-net discards TX data after link down")
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Cc: Yuri Benditovich <yuri.benditovich@daynix.com>
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Cc: Paolo Bonzini <pbonzini@redhat.com>
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Cc: Stefan Hajnoczi <stefanha@redhat.com>
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Cc: Michael S. Tsirkin <mst@redhat.com>
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Cc: qemu-stable@nongnu.org
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit 70e53e6e4da3db4b2c31981191753a7e974936d0)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/net/virtio-net.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
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index 148071a..fbc5e1b 100644
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--- a/hw/net/virtio-net.c
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+++ b/hw/net/virtio-net.c
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@@ -288,7 +288,8 @@ static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
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qemu_bh_cancel(q->tx_bh);
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}
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if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 &&
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- (queue_status & VIRTIO_CONFIG_S_DRIVER_OK)) {
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+ (queue_status & VIRTIO_CONFIG_S_DRIVER_OK) &&
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+ vdev->vm_running) {
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/* if tx is waiting we are likely have some packets in tx queue
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* and disabled notification */
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q->tx_waiting = 0;
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--
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1.8.3.1
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