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.
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