Re: [PATCH v4 07/17] iommufd: PFN handling for iopt_pages

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On Fri, Nov 11, 2022 at 11:09:08AM +0000, Tian, Kevin wrote:
> <...2nd part>
> 
> > From: Jason Gunthorpe <jgg@xxxxxxxxxx>
> > Sent: Tuesday, November 8, 2022 8:49 AM
> > +
> > +/* pfn_reader_user is just the pin_user_pages() path */
> > +struct pfn_reader_user {
> > +	struct page **upages;
> > +	size_t upages_len;
> > +	unsigned long upages_start;
> > +	unsigned long upages_end;
> > +	unsigned int gup_flags;
> > +	int locked;
> 
> document what locked==-1/0/1 means

+       /*
+        * 1 means mmget() and mmap_read_lock(), 0 means only mmget(), -1 is
+        * neither
+        */


> > +/* Process a single span in the access_itree */
> 
> in all storages.

+/* Process a single span to load it from the proper storage */

Thanks,
Jason



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