During unplug the virtio device is unplugged from virtio-bus on pci. In some cases, requests to virtio-pci mm may acquire during/after unplug. Added check that virtio device is on the bus, for "common" memory region.
Signed-off-by: Andrew Melnychenko <and...@daynix.com> --- hw/virtio/virtio-pci.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index b321604d9b..05865b1fcb 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -1146,6 +1146,10 @@ static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr, uint32_t val = 0; int i; + if (vdev == NULL) { + return UINT64_MAX; + } + switch (addr) { case VIRTIO_PCI_COMMON_DFSELECT: val = proxy->dfselect; @@ -1229,6 +1233,10 @@ static void virtio_pci_common_write(void *opaque, hwaddr addr, VirtIOPCIProxy *proxy = opaque; VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); + if (vdev == NULL) { + return; + } + switch (addr) { case VIRTIO_PCI_COMMON_DFSELECT: proxy->dfselect = val; -- 2.31.1