On Tue, 25 Sep 2018 09:44:24 +0800 Acewind <acew...@gmail.com> wrote:
> In my host os, command of ' lspci -v -s 00:02.0' will show: > Memory at e8000000 (64-bit, prefetchable) [size=128M] > > Is this 128M memory called 'stolen memory'? No, stolen memory is system memory dedicated to graphics use, it is not represented by a PCI BAR. > If this IGD device is passed through into guest os, will it be deserted and > wasted? Or mapped into and resused in guest os? PCI BARs are mapped to the VM. SeaBIOS will attempt to allocate new stolen memory in the VM, so the host stolen memory is wasted, but it's not represented in a BAR. Re-using the host stolen memory is difficult because it's not actually a resource associated with the device except through IGD usage and it's physical address space is immovable, creating holes in the VM address space at host specific addresses. Thanks, Alex _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
