Added check for "notify" memory region. Now reads will return "-1" if a virtio device is not present on a virtio bus.
Signed-off-by: Andrew Melnychenko <and...@daynix.com> --- hw/virtio/virtio-pci.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 186b7bc0f6..447f13beae 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -1348,6 +1348,11 @@ static void virtio_pci_common_write(void *opaque, hwaddr addr, static uint64_t virtio_pci_notify_read(void *opaque, hwaddr addr, unsigned size) { + VirtIOPCIProxy *proxy = opaque; + if (virtio_bus_get_device(&proxy->bus) == NULL) { + return UINT64_MAX; + } + return 0; } @@ -1385,7 +1390,7 @@ static uint64_t virtio_pci_isr_read(void *opaque, hwaddr addr, uint64_t val; if (vdev == NULL) { - return 0; + return UINT64_MAX; } val = qatomic_xchg(&vdev->isr, 0); @@ -1406,7 +1411,7 @@ static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr, uint64_t val; if (vdev == NULL) { - return 0; + return UINT64_MAX; } switch (size) { -- 2.31.1