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xen-devel
RE: [Xen-devel] Re: [PATCH] EPT: Only sync pcpus on which a domain's vcp
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To: |
George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] Re: [PATCH] EPT: Only sync pcpus on which a domain's vcpus might be running |
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From: |
Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> |
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Date: |
Fri, 18 Sep 2009 10:06:04 -0700 (PDT) |
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Cc: |
Xiaohui Xin <Xiaohui.xin@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Deegan <Tim.Deegan@xxxxxxxxxxxxx>, Tim, Xin Li <xin.b.li@xxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx> |
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Fri, 18 Sep 2009 10:06:48 -0700 |
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> In theory, the memory handed back by the balloon driver shouldn't be
> touched by the OS. I think it would be OK if guess accesses to that
> gfn space didn't fail for the guest giving up the pages; however, we
> can't give the memory to another guest until we know for sure that the
> first guest can't possibly access it anymore. I think we should be
> able to modify the balloon driver to "batch" some number of updates;
> say, 1024 at a time. Paul, any thoughts on this?
Not sure if this is relevant, but tmem can and will grab
memory handed back by the balloon driver for one guest
and immediately use it for another guest's data.
So I hope the ballooning guest can't possibly access it
anymore!
Dan
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