Re: swapping with MMU Notifiers V2

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Carsten Otte wrote:
> Avi Kivity wrote:
>> Every arch except s390 needs it.  An ugly #ifndef 
>> CONFIG_KVM_HARDWARE_TLB_SYNC is preferred to duplicating the code.
> BTW, from reading AMDs spec I don't expect NPT to need this vehicle 
> for swapping either. They can just let core-vm page out guest pages 
> and will receive a proper page fault in the host. Jörg can you confirm 
> that?
>

No, that doesn't work:

- even though npt can use the same pagetable for guest and host, that 
isn't workable for kvm as npt doesn't have an offset/size thing.  so kvm 
uses a separate pagetable for guest and host.
- npt doesn't have a dual-tagged tlb, where a host tlb invalidate also 
invalidates all guest tlbs that point to the same page

Try again in 25 years, maybe x86 will reach where s390 is now by that 
timeframe.

-- 
error compiling committee.c: too many arguments to function


-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/