[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Question about hyper-threading of domains
Lars Roland wrote: Seans fair enough - Out of curiosity have you published these measurements anywere ? No nothing yet, apart from the iperf numbers posted previously to this list. I previously stated that using small address spaces means giving up driver isolation, but I think that with the right use of segments that should not be necessary, so there is no trade-off with regards to isolation.Could you explain a little further how excalty you plan to avoid this - I have been digging into this myslef and It is not obvious to me how this can be achived, I have not implemented this, and perhaps I am not understanding the x86 docs correctly, but it seems I can set up and expands-down segment to confine dom0 to its allowed range of addresses (0xf0000000 - 0xfc000000). If that does not work, I can move dom0 to the range 0x0 - 0x0c000000, and use the segment base to move it to 0xf0000000. The latter approach will require that I fix up copy_from_user and friends inside Xen to take this into account, but that seems doable. Yes please - I have the time (and hardware) to check this. I will try to roll something up later today or tomorrow, before flying to Boston for NSDI. Jacob _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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