Re: linux next: Native Linux KVM tool inclusion request

[Avi Kivity]

On 08/23/2011 08:08 AM, Pekka Enberg wrote:
> As for changes, we've implemented rootfs over 9p with "kvm run"
> booting to host filesystem "/bin/sh" by default.

Isn't this dangerous?  Users expect virtualization to land them in 
sandbox, but here an rm -rf / in the guest will happily junk the host 
filesystem.

> It still needs some
> work and we hope to enable networking too. We also have patches to use
> overlayfs so that the guest is able to use host filesystem in
> copy-on-write manner.

Still dangerous (but just to the guest), since it's not a true 
snapshot.  If the host filesystem changes underneath the guest, it will 
see partial and incoherent updates.  Copy-on-write only works if the 
host filesystem doesn't change.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/