May I reduce the 128M to 8M in host BIOS, and set it to 128M by some arguments when call seabios firmware?
Alex Williamson <alex.william...@redhat.com> 于2018年9月25日周二 上午9:57写道： > 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 >
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