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virtio-pci: Changed vdev to proxy for VirtIO PCI BAR callbacks.

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There is an issue when callback may be called with invalid vdev.
It happens on unplug when vdev already deleted and VirtIOPciProxy is not.
So now, callbacks accept proxy device, and vdev retrieved from it.
Technically memio callbacks should be removed during the flatview update,
but memoryregions remain til PCI device(and it's address space) completely deleted.
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1716352

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
Message-Id: <20200706112123.971087-1-andrew@daynix.com>
Cc: qemu-stable@nongnu.org
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Andrew Melnychenko 2020-07-06 14:21:23 +03:00 committed by Michael S. Tsirkin
parent a4544c45e1
commit ccec7e9603
1 changed files with 24 additions and 10 deletions
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34
hw/virtio/virtio-pci.c
View file

@ -1333,11 +1333,12 @@ static uint64_t virtio_pci_notify_read(void *opaque, hwaddr addr,
static void virtio_pci_notify_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
VirtIODevice *vdev = opaque;
VirtIOPCIProxy *proxy = VIRTIO_PCI(DEVICE(vdev)->parent_bus->parent);
VirtIOPCIProxy *proxy = opaque;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
unsigned queue = addr / virtio_pci_queue_mem_mult(proxy);
if (queue < VIRTIO_QUEUE_MAX) {
if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) {
virtio_queue_notify(vdev, queue);
}
}
@ -1345,10 +1346,12 @@ static void virtio_pci_notify_write(void *opaque, hwaddr addr,
static void virtio_pci_notify_write_pio(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
VirtIODevice *vdev = opaque;
VirtIOPCIProxy *proxy = opaque;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
unsigned queue = val;
if (queue < VIRTIO_QUEUE_MAX) {
if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) {
virtio_queue_notify(vdev, queue);
}
}
@ -1372,9 +1375,14 @@ static void virtio_pci_isr_write(void *opaque, hwaddr addr,
static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr,
unsigned size)
{
VirtIODevice *vdev = opaque;
VirtIOPCIProxy *proxy = opaque;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
uint64_t val = 0;
if (vdev == NULL) {
return val;
}
switch (size) {
case 1:
val = virtio_config_modern_readb(vdev, addr);
@ -1392,7 +1400,13 @@ static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr,
static void virtio_pci_device_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
VirtIODevice *vdev = opaque;
VirtIOPCIProxy *proxy = opaque;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
if (vdev == NULL) {
return;
}
switch (size) {
case 1:
virtio_config_modern_writeb(vdev, addr, val);
@ -1469,19 +1483,19 @@ static void virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy)
memory_region_init_io(&proxy->device.mr, OBJECT(proxy),
&device_ops,
virtio_bus_get_device(&proxy->bus),
proxy,
"virtio-pci-device",
proxy->device.size);
memory_region_init_io(&proxy->notify.mr, OBJECT(proxy),
&notify_ops,
virtio_bus_get_device(&proxy->bus),
proxy,
"virtio-pci-notify",
proxy->notify.size);
memory_region_init_io(&proxy->notify_pio.mr, OBJECT(proxy),
&notify_pio_ops,
virtio_bus_get_device(&proxy->bus),
proxy,
"virtio-pci-notify-pio",
proxy->notify_pio.size);
}