On Wed, Aug 27, 2014 at 9:32 PM, Dave Airlie <[email protected]> wrote: >> On Wed, Aug 27, 2014 at 3:01 PM, Alex Williamson >> <[email protected]> wrote: >>> If we assign a Radeon device to a virtual machine, we can no longer >>> assume a fixed hardware topology, like the GPU having a parent device. >>> This patch simply adds a few pci_is_root_bus() tests to avoid passing >>> a NULL pointer to PCI access functions, allowing the radeon driver to >>> work in a QEMU 440FX machine with an assigned HD8570 on the emulated >>> PCI root bus. >>> >>> Signed-off-by: Alex Williamson <[email protected]> >> > > Does this mean inside a VM we can't enable pcie 2 speeds? > > This could lead to a quite disappointing speed decrease for DMA transfers.
It depends on the sbios, but most boards negotiate the highest speed at boot. Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
