Messages in this thread | | | Date | Mon, 10 Sep 2012 07:51:42 +0200 | From | Paolo Bonzini <> | Subject | Re: [PATCH] virtio-balloon spec: provide a version of the "silent deflate" feature that works |
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Il 10/09/2012 03:43, Rusty Russell ha scritto: >> Now that vfio is upstream and work on qemu integration >> is being worked on, we might finally see people using this bit >> to allow memory overcommit with device assignment. > That was left-field.... so you're saying some guest might pull a page > from the balloon and DMA to it, and the vfio device needs to know in > advance that it's going to do it?
Not the vfio device, but the page needs to be pinned with mlock so the effect is the same.
> But what will we do if the guest doesn't ack the bit?
Just pin the whole memory.
Paolo
> ie. I don't think it can really be optional.
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