On Mon, May 10, 2010 at 10:40 AM, Avi Kivity <a...@redhat.com> wrote: > On 05/10/2010 06:41 PM, Cam Macdonell wrote: >> >>> What would happen to any data written to the BAR before the the handshake >>> completed? I think it would disappear. >>> >> >> But, the BAR isn't there until the handshake is completed. Only after >> receiving the shared memory fd does my device call pci_register_bar() >> in the callback function. So there may be a case with BAR2 (the >> shared memory BAR) missing during initialization. FWIW, I haven't >> encountered this. >> > > Well, that violates PCI. You can't have a PCI device with no BAR, then have > a BAR appear. It may work since the BAR is registered a lot faster than the > BIOS is able to peek at it, but it's a race nevertheless.
Agreed. I'll get Anthony's idea up and running. It seems that is the way forward. Cam
