[Xen-devel] Re: [PATCH 0 of 4] mm+paravirt+xen: add pte read-modify-write abstraction

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Zachary Amsden wrote:
> We don't fault.  We write directly to the primary page tables, and clear
> the pte just like native.  We just issue all mprotect updates in the
> queue, and flush the queue when leaving lazy mmu mode.  You can't wait
> for the TLB flush, you must flush the updates before releasing the
> pagetable lock, or you could get misordered updates in an SMP system.
>   
How do you track which ptes need shadow updates?  Do you walk the entire 
pagetable on tlb flush?  Or just rebuild the shadow from scratch on demand?
   J

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