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xen-devel
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
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