Re: [PATCH 001/001] mmu-notifier-core v17

Jack Steiner
2008-05-12T20:01:13Z

On Fri, May 09, 2008 at 09:32:30PM +0200, Andrea Arcangeli wrote:
> From: Andrea Arcangeli <andrea@qumranet.com>
>
> With KVM/GFP/XPMEM there isn't just the primary CPU MMU pointing to
> pages. There are secondary MMUs (with secondary sptes and secondary
> tlbs) too. sptes in the kvm case are shadow pagetables, but when I say
> spte in mmu-notifier context, I mean "secondary pte". In GRU case
> there's no actual secondary pte and there's only a secondary tlb
> because the GRU secondary MMU has no knowledge about sptes and every
> secondary tlb miss event in the MMU always generates a page fault that
> has to be resolved by the CPU (this is not the case of KVM where the a
> secondary tlb miss will walk sptes in hardware and it will refill the
>...

FYI, I applied to patch to a tree that has the GRU driver. All regression
tests passed.

--- jack