Now we regenerate vconfig for all the BARs via vfio_bar_fixup(), every
time any offset of any of them are read. Though BARs aren't re-read
regularly, the regeneration can be avoided if no BARs had been written
since they were last read, in which case vdev->bardirty is false.
Let's return immediately in vfio_bar_fixup() if bardirty is false.
Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
__le32 *vbar;
u64 mask;
+ if (!vdev->bardirty)
+ return;
+
vbar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
for (i = 0; i < PCI_STD_NUM_BARS; i++, vbar++) {