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Date: Mon, 12 Jan 2015 12:58:46 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: David Vrabel <david.vrabel@...rix.com> Cc: <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org> Subject: Re: [PATCHv2 0/2] mm: infrastructure for correctly handling foreign pages on Xen On Mon, 12 Jan 2015 15:53:11 +0000 David Vrabel <david.vrabel@...rix.com> wrote: > These two patches are the common parts of a larger Xen series[1] > fixing several long-standing bugs the handling of foreign[2] pages in > Xen guests. > > The first patch is required to fix get_user_pages[_fast]() with > userspace space mappings of such foreign pages. Basically, pte_page() > doesn't work so an alternate mechanism is needed to get the page from > a VMA and address. By requiring mappings needing this method are > 'special' this should not have an impact on the common use cases. > > The second patch isn't essential but helps with readability of the > resulting user of the page flag. > > For further background reading see: > > http://xenbits.xen.org/people/dvrabel/grant-improvements-C.pdf > Looks OK to me. I can merge them if you like, but it's probably more convenient for you to include them in the Xen tree. It would be nice if PG_foreign (and PG_everythingelse) was properly documented at the definition site. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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