From: David Vrabel <david.vrabel@citrix.com>
To: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Cc: David Vrabel <david.vrabel@citrix.com>,
linux-mm@kvack.org, xen-devel@lists.xenproject.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: [PATCHv1 0/2] mm: infrastructure for correctly handling foreign pages on Xen
Date: Thu, 8 Jan 2015 15:28:42 +0000 [thread overview]
Message-ID: <1420730924-22811-1-git-send-email-david.vrabel@citrix.com> (raw)
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
David
[1] http://lists.xen.org/archives/html/xen-devel/2015-01/msg00326.html
[2] Another guest's page temporarily granted to this guest.
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next reply other threads:[~2015-01-08 15:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-08 15:28 David Vrabel [this message]
2015-01-08 15:28 ` [PATCH 1/2] mm: allow for an alternate set of pages for userspace mappings David Vrabel
2015-01-08 17:20 ` Johannes Weiner
2015-01-08 17:50 ` David Vrabel
2015-01-08 15:28 ` [PATCH 2/2] mm: add 'foreign' alias for the 'pinned' page flag David Vrabel
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