RE: Fw: [Xen-devel] Xen on /. again

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> Question: 
> a) Does the balloon driver clean pages before releasing it to 
> other partitions? (I guess not) 

Yes it does.

> b) Does the page-swap thas happens when a packet is received 
> clear the pages? (I guess not) 

There is a pool of pages that are used for network IO. They're not
normally scrubbed when they get flipped, on the grounds that network
packets could be sniffed on the wire anyhow. Pages are scrubbed before
entering the pool. 

I guess we could have a config option that also zeroed the payload area
of a packet when the skb is freed, for those that want belt and braces.

[NB: one area we need to investigate is whether the kernel ever does
decrypt in-place in the skb data area, and if so, throw the page out of
the pool.]

Ian


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