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From: | Kevin Wolf |
Subject: | Re: [Qemu-devel] PATCH: v3 Allow control over drive file open mode |
Date: | Tue, 12 Aug 2008 13:42:01 +0200 |
User-agent: | Thunderbird 2.0.0.12 (X11/20071114) |
Ian Jackson schrieb: >> qemu-system-x86_64 -drive file=foo.img -drive file=boo.img,read-only=on >> >> Down the road, you do a savevm. savevm has to create a checkpoint in >> all disk images. The checkpoint will be empty in boo.img but it still >> needs to create one. > > Perhaps I don't understand clearly enough how you imagine this > scenario. Surely when the snapshot is resumed it is sufficient for > the file boo.img to be identical ? > > What are these checkpoints ? Are they currently written by anything ? > > I've tried to look for the code you would be referring to but I can't > seem to find it. qemu_savevm_state just calls all the things recorded > with register_savevm and I can't seem to find anything that would do > anything to block drivers. This code is in do_savevm (in vl.c). Look for /* create the snapshots */ Kevin
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