On 06/05/2013 03:08 PM, Anthony Liguori wrote: >> >> Definitely an option. However, we want to be able to boot from native >> devices, too, so having an I/O BAR (which would not be used by the OS >> driver) should still at the very least be an option. > > What makes it so difficult to work with an MMIO bar for PCI-e? > > With legacy PCI, tracking allocation of MMIO vs. PIO is pretty straight > forward. Is there something special about PCI-e here? > It's not tracking allocation. It is that accessing memory above 1 MiB is incredibly painful in the BIOS environment, which basically means MMIO is inaccessible. -hpa _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
