From: David Vrabel <david.vrabel@citrix.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [Xen-devel] Re: [PATCH 0/6] xen: don't call vmalloc_sync_all() when mapping foreign pages
Date: Fri, 23 Sep 2011 12:18:48 +0100 [thread overview]
Message-ID: <4E7C6B18.7030100@citrix.com> (raw)
In-Reply-To: <4E7BA677.9090907@goop.org>
On 22/09/11 22:19, Jeremy Fitzhardinge wrote:
>
> But I'd be happier pretending that vmalloc_sync_* just doesn't exist,
> and deal with it at the hypercall level - in the short term, by just
> making sure that the callers touch all those pages before passing them
> into the hypercall.
I don't think you can access the pages at the addresses allocated with
alloc_vm_area() because the pages don't exist yet and there's a check of
pte_present() in vmalloc_fault() and I think an Oops will be reported.
David
next prev parent reply other threads:[~2011-09-23 11:16 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-15 12:40 [PATCH 0/6] xen: don't call vmalloc_sync_all() when mapping foreign pages David Vrabel
2011-09-15 12:40 ` [PATCH 1/6] xen: add functions for mapping foreign pages over pages David Vrabel
2011-09-15 12:40 ` [PATCH 2/6] block: xen-blkback: use API provided by xenbus module to map rings David Vrabel
2011-09-15 12:40 ` [PATCH 3/6] net: xen-netback: " David Vrabel
2011-09-15 12:40 ` [PATCH 4/6] xen: xen-pciback: use xenbus_map_ring_page() " David Vrabel
2011-09-15 12:40 ` [PATCH 5/6] xen: xenbus: remove xenbus_map_ring_valloc() and xenbus_map_ring_vfree() David Vrabel
2011-09-15 12:40 ` [PATCH 6/6] mm: remove vmalloc_sync_all() from alloc_vm_area() David Vrabel
2011-09-15 21:37 ` [PATCH 0/6] xen: don't call vmalloc_sync_all() when mapping foreign pages Jeremy Fitzhardinge
2011-09-21 10:42 ` Stefano Stabellini
2011-09-21 18:57 ` [Xen-devel] " Jeremy Fitzhardinge
2011-09-22 11:06 ` Stefano Stabellini
2011-09-22 21:19 ` Jeremy Fitzhardinge
2011-09-23 10:53 ` Stefano Stabellini
2011-09-23 11:18 ` David Vrabel [this message]
2011-09-21 14:44 ` David Vrabel
2011-09-23 15:11 ` David Vrabel
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