Subject: Re: [RFC PATCH V2 5/5] vhost: access vq metadata through kernel virtual address

From: Andrea Arcangeli <[email-masked]>
Date: Fri, 8 Mar 2019 14:13:45 -0500

On Fri, Mar 08, 2019 at 04:58:44PM +0800, Jason Wang wrote:
> Can I simply can set_page_dirty() before vunmap() in the mmu notifier 
> callback, or is there any reason that it must be called within vumap()?

I also don't see any problem in doing it before vunmap. As far as the
mmu notifier and set_page_dirty is concerned vunmap is just
put_page. It's just slower and potentially unnecessary.