Linux – Unable to get folder sharing to work under KVM Virtual Machine Manager

linux-kvmvirtual machine

I've created an Ubuntu VM inside my Ubuntu using Virtual Machine Manager. I'm trying to mount a host directory in guest OS but it's not working. I used the instructions provided here: http://troglobit.com/blog/2013/07/05/file-system-pass-through-in-kvm-slash-qemu-slash-libvirt/.
I have shared the host directory as "myshare".

The mount command completes silently:

mount -t 9p -o trans=virtio,version=9p2000.L,rw myshare /mnt/host

mount output looking promising:

myshare on /mnt/host type 9p (rw, trans=virtio,version=9p2000.L)

However, attempting to list the directory produces:

cd /mnt
ls
ls: cannot access host: Permission denied
total 0
d???????? ? ? ?         ? host

Best Answer

The answer can be found here:

https://askubuntu.com/questions/445193/kvm-virtual-machine-manager-sharing-folders-not-working

The person was right - it was an apparmor issue. Now I need to figure out how to configure apparmor in libvirt to allow sholder sharing but that's a whole other issue.

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Linux – KVM module not found by virtual machine manager

sudo insmod kvm-intel

or simply

sudo insmod kvm

does that work?

Also check this:

First check if your CPU supports hardware virtualization - if this is the case, the command

egrep '(vmx|svm)' --color=always /proc/cpuinfo

should display something, e.g. like this:

root@server1:~# egrep '(vmx|svm)' --color=always /proc/cpuinfo flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good nopl extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch lbrv flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good nopl extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch lbrv root@server1:~#

If nothing is displayed, then your processor doesn't support hardware virtualization, and you must stop here.

Linux – Wireless bridge on KVM virtual machine

I had exactly the same requirement as Zvika. By the way, his post on the subject is excellent. The alternative I found is this: configure a routed network in KVM in the range 192.168.1.160/28 (so, dedoimedo third solution, the "dirty hack") and then, instead of creating an ARP proxy the Zvika's way, I used parprouted, which is available in Ubuntu/Mint as a package with the same name. With parprouted, you can just type:

sudo parprouted virbr1 wlan0

et voilà, traffic works in both ways to/from the guest VM and the other devices in 192.168.1.0/24 network, as well as to/from external systems (e.g. Internet sites) if that network is behind a NAT.

This was hard, anyway, I spent days searching on this subject and no source was as clear as Zvika's blog entry!!

Best Answer

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Linux – Wireless bridge on KVM virtual machine

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