Each qemu (version) is slightly different in the road to this, but then seems to behave.
This one is slightly better to get "in front" of the slow call to map all the memory. $ virsh nodedev-detach pci_0000_21_00_1 --driver vfio $ gdb /usr/bin/qemu-system-x86_64 (gdb) b vfio_dma_map (gdb) command 1 Type commands for breakpoint(s) 1, one per line. End with a line saying just "end". >silent >if size != 134217728000 >cont >end >end (gdb) run -m 131072 -smp 1 -no-user-config -device vfio-pci,host=21:00.1,id=hostdev0,bus=pci.0,addr=0x7 -enable-kvm (gdb) catch syscall 16 (gdb) c Also correct the link to qemu - it is the one from vfio_listener_region_add: https://git.qemu.org/?p=qemu.git;a=blob;f=hw/vfio/common.c;h=3e03c495d868f154b26a33c0c2d870273a0b4198;hb=HEAD#l664 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1838575 Title: passthrough devices cause >17min boot delay Status in linux package in Ubuntu: Confirmed Status in qemu package in Ubuntu: Incomplete Bug description: Adding passthrough devices to a guest introduces a boot delay of > 17 minutes. During this time libvirt reports the guest to be "paused". The delay does not seem to scale with the # of hostdevs - that is, 1 hostdev causes about a 17min delay, while 16 only bumps that up to ~18min. Removing all hostdevs avoids the delay. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1838575/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
