> On Wed, Aug 27, 2014 at 3:01 PM, Alex Williamson > <alex.williamson at redhat.com> 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 <alex.williamson at redhat.com> >
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. Dave.
