Hi there. My question is regarding virtfs/9p/v9fs [1], not sure what's the appropiate name :) Basically I have a KVM + libvirt server sharing a directory with a guest in mapped mode. It works fine, but the only issue is with the file permissions of the files created by the guest inside the host: -They are 0700 for dirs and 0400 for files -The files belongs to the same user that runs the "qemu-system-x86_64" process, which is "libvirt-qemu" Questions: 1. There's a way to change the umask of this user (I'm almost sure that I already tried this and it didn't worked) or to change any setting to force the permissions to be wider? 2. It's acceptable to run the "qemu-system-x86_64" as root, and switch to "passthrough" mode? Below some details of my environment. ==== Host ==== $ uname -r 3.12-1-amd64 $ cat /etc/issue Debian GNU/Linux jessie/sid \n \l $ sudo dpkg -l | grep libvirt ii libvirt-bin 1.2.0-2 amd64 programs for the libvirt library ii libvirt0 1.2.0-2 amd64 library for interfacing with different virtualization systems ii python-libvirt 1.2.0-2 amd64 libvirt Python bindings $ ps ax | grep vm_name 23307 ? Sl 0:40 qemu-system-x86_64 -enable-kvm -name vm_name -S -machine pc-1.1,accel=kvm,usb=off -cpu core2duo,+lahf_lm,+pdcm,+xtpr,+cx16,+tm2,+est,+smx,+vmx,+ds_cpl,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds -m 1024 -realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid 2387f160-ffa2-3463-1aa3-771594779df3 -nographic -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/vm_name.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/dev/vg/lv_vm_name,if=none,id=drive-virtio-disk0,format=raw,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -fsdev local,security_model=mapped,id=fsdev-fs0,path=/srv/share -device virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,mount_tag=virtfs_share,bus=pci.0,addr=0x3 -netdev tap,fd=28,id=hostnet0,vhost=on,vhostfd=29 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:68:90:d8,bus=pci.0,addr=0x4 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7 Guest XML snippet: <filesystem type='mount' accessmode='mapped'> <source dir='/srv/share/> <target dir='virtfs_share'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </filesystem> Thanks. Javier [1] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/Docu...