On Fri, Sep 28, 2012 at 07:01:06PM +0200, Joerg Roedel wrote: > On Fri, Sep 28, 2012 at 12:36:05PM -0400, Linda Knippers wrote: > > I can only speak to the HP servers. We have been shipping devices > > 'for a while' that provide sensor-type data to the platform. The > > device does DMA writes to a range of memory (the RMRR) and > > iLO does DMA reads of that data. > > And what PCI request-ids are used for these DMA transfers? Are this > request-ids which belong to devices Linux handles on its own? > > > If we address Alex's comments and we make a change to disallow the > > devices (non-USB devices?) with RMRRs from being assigned to > > a guest, will those changes be considered? > > This is overkill in my eyes. It means that *any* device which has an > RMRR defined, whether it is on your platform or not, can not be assigned > to a guest. > > I think it is better to have the RMRR regions mapped in the domains used > for DMA-API mappings and disallow to assign these devices to guests.
Of course I meant "allow to assign these devices to guests." > For devices where this breaks we can implement some quirk-solution and > disallow guest assignment. But disallowing assignment of devices with > RMRR defined in general is pure overkill. > > > Joerg > > > _______________________________________________ > iommu mailing list > [email protected] > https://lists.linuxfoundation.org/mailman/listinfo/iommu _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
