Gerd Hoffmann <kra...@redhat.com> 于2018年9月19日周三 下午12:26写道： > > > > > 2. Only 4x devices is supported, you need to be careful not to overuse > > > > > > Could you elaborate on this please? What happens if you are not careful? > > > How does management know what the limits are? > > > > It means the user might use more space than 768MB for mmconfig, > > which is [0x80000000m 0xb0000000). If such situation happens, seabios > > will ignore all extra pxb-pcie devices and not adding e820 entry for them, > > which makes all the devices under them unworkable. > > Ypu should clearly note that this is a limitation of the seabios support > patches then, so not an issue of the qemu patches.
OK, description will be clearer in next version. > > As for the management, will some checks when adding mcfg be enough for > > management? Or I can maintain a variable to indicate how many space > > have been consumed and warn the user if they exceed the threshold? > > The latter allows us to do the check when the pxb-pcie is initializing. > > I think qemu should not apply any restrictions here. But will that confuse users when their device is not listed in guest os while qemu does not throw any error/warning? > cheers, > Gerd > Thanks, Zihan
