Re: KVM: MMU: optimize set_spte for page sync

[Avi Kivity <avi@redhat.com>]

Marcelo Tosatti wrote:
>
> Here it goes.
>
> KVM: MMU: optimize set_spte for page sync
>
> The write protect verification in set_spte is unnecessary for page sync.
>
> Its guaranteed that, if the unsync spte was writable, the target page
> does not have a write protected shadow (if it had, the spte would have
> been write protected under mmu_lock by rmap_write_protect before).
>
> Same reasoning applies to mark_page_dirty: the gfn has been marked as
> dirty via the pagefault path.
>
> The cost of hash table and memslot lookups are quite significant if the
> workload is pagetable write intensive resulting in increased mmu_lock
> contention.
>
>   

Applied, thanks.

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