Messages in this thread | | | Date | Wed, 17 Jun 2015 13:51:56 +0200 | From | "Michael S. Tsirkin" <> | Subject | Re: [PATCH 3/5] vhost: support upto 509 memory regions |
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On Wed, Jun 17, 2015 at 01:48:03PM +0200, Igor Mammedov wrote: > > > So far it's kernel limitation and this patch fixes crashes > > > that users see now, with the rest of patches enabling performance > > > not to regress. > > > > When I say regression I refer to an option to limit the array > > size again after userspace started using the larger size. > Is there a need to do so?
Considering userspace can be malicious, I guess yes.
> Userspace that cares about memory footprint won't use many slots > keeping it low and user space that can't do without many slots > or doesn't care will have bigger memory footprint.
We really can't trust userspace to do the right thing though.
-- MST
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