On Mon, Sep 10, 2018 at 11:18:38AM +0200, Gert Wollny wrote: > Am Montag, den 10.09.2018, 10:37 +0200 schrieb Gerd Hoffmann: > ... > > > > The other question is of course, why did dma_buf_export fail for me > > > ... > > > > What exactly did you try? > > I ran > > qemu-system-x86_64 -enable-kvm -smp 5 -M q35 -m 8G \ > -drive format=raw,file=ubuntu.raw,if=virtio \ > -net nic,model=virtio -net user,hostfwd=tcp::2224-:22 \ > -vga virtio
By default qemu doesn't use memfd for backing storage, you have to explicitly configure qemu that way (see qemu commit log of the test branch): qemu-system-x86_64 -m 2G -object memory-backend-memfd,id=ram,size=2G -numa node,memdev=ram" HTH, Gerd