Messages in this thread | | | Date | Tue, 08 Nov 2011 18:34:33 +0100 | From | Alexander Graf <> | Subject | Re: [PATCH] KVM: Add wrapper script around QEMU to test kernels |
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On 11/08/2011 03:59 PM, Christoph Hellwig wrote: > On Tue, Nov 08, 2011 at 04:57:04PM +0200, Avi Kivity wrote: >>> Running qemu -snapshot on the actual root block device is the only >>> safe way to reuse the host installation, although it gets a bit >>> complicated if people have multiple devices mounted into the namespace. >> How is -snapshot any different? If the host writes a block after the >> guest has been launched, but before that block was cowed, then the guest >> will see the new block. > Right, thinko - qemu's snapshots are fairly useless due to sitting > ontop of the file to be modified. > >> It could work with a btrfs snapshot, but not everyone uses that. > Or LVM snapshot. Either way, just reusing the root fs without care > is a dumb idea, and I really don't want any tool or script that > encurages such braindead behaviour in the kernel tree.
Heh, yeah, the intent was obviously to have a separate rootfs tree somewhere in a directory. But that's not available at first when running this, so I figured for a simple "get me rolling" FAQ directing the guest's rootfs to / at least gets you somewhere (especially when run as user with init=/bin/bash).
Alex
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