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Re: [PATCH] virtio-mmio : fix the crash in the vm shutdown
From: |
Jason Wang |
Subject: |
Re: [PATCH] virtio-mmio : fix the crash in the vm shutdown |
Date: |
Tue, 9 Nov 2021 15:34:06 +0800 |
On Tue, Nov 9, 2021 at 10:37 AM Cindy Lu <lulu@redhat.com> wrote:
>
> The root cause for this crash is the ioeventfd not stopped while the VM stop.
> The callback for vmstate_change was not implement in virtio-mmio bus
>
> Reproduce step
> load the vm with
> -M microvm \
> -netdev tap,id=net0,vhostforce,script=no,downscript=no \
> -device virtio-net-device,netdev=net0\
>
> After the VM boot, login the vm and then shutdown the vm
>
> System will crash
> [Current thread is 1 (Thread 0x7ffff6edde00 (LWP 374378))]
> (gdb) bt
> 0 0x00005555558f18b4 in qemu_flush_or_purge_queued_packets (purge=false,
> nc=0x55500252e850) at ../net/net.c:636
> 1 qemu_flush_queued_packets (nc=0x55500252e850) at ../net/net.c:656
> 2 0x0000555555b6c363 in virtio_queue_notify_vq (vq=0x7fffe7e2b010) at
> ../hw/virtio/virtio.c:2339
> 3 virtio_queue_host_notifier_read (n=0x7fffe7e2b08c) at
> ../hw/virtio/virtio.c:3583
> 4 0x0000555555de7b5a in aio_dispatch_handler (ctx=ctx@entry=0x5555567c5780,
> node=0x555556b83fd0) at ../util/aio-posix.c:329
> 5 0x0000555555de8454 in aio_dispatch_ready_handlers (ready_list=<optimized
> out>, ctx=<optimized out>) at ../util/aio-posix.c:359
> 6 aio_poll (ctx=0x5555567c5780, blocking=blocking@entry=false) at
> ../util/aio-posix.c:662
> 7 0x0000555555cce0cc in monitor_cleanup () at ../monitor/monitor.c:645
> 8 0x0000555555b06bd2 in qemu_cleanup () at ../softmmu/runstate.c:822
> 9 0x000055555586e693 in main (argc=<optimized out>, argv=<optimized out>,
> envp=<optimized out>) at ../softmmu/main.c:51
>
> Signed-off-by: Cindy Lu <lulu@redhat.com>
> ---
Acked-by: Jason Wang <jasowang@redhat.com
Thanks
> hw/virtio/virtio-mmio.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c
> index 7b3ebca178..72da12fea5 100644
> --- a/hw/virtio/virtio-mmio.c
> +++ b/hw/virtio/virtio-mmio.c
> @@ -817,6 +817,17 @@ static char *virtio_mmio_bus_get_dev_path(DeviceState
> *dev)
> return path;
> }
>
> +static void virtio_mmio_vmstate_change(DeviceState *d, bool running)
> +{
> + VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
> +
> + if (running) {
> + virtio_mmio_start_ioeventfd(proxy);
> + } else {
> + virtio_mmio_stop_ioeventfd(proxy);
> + }
> +}
> +
> static void virtio_mmio_bus_class_init(ObjectClass *klass, void *data)
> {
> BusClass *bus_class = BUS_CLASS(klass);
> @@ -832,6 +843,7 @@ static void virtio_mmio_bus_class_init(ObjectClass
> *klass, void *data)
> k->ioeventfd_enabled = virtio_mmio_ioeventfd_enabled;
> k->ioeventfd_assign = virtio_mmio_ioeventfd_assign;
> k->pre_plugged = virtio_mmio_pre_plugged;
> + k->vmstate_change = virtio_mmio_vmstate_change;
> k->has_variable_vring_alignment = true;
> bus_class->max_dev = 1;
> bus_class->get_dev_path = virtio_mmio_bus_get_dev_path;
> --
> 2.21.3
>