From: David Vrabel <david.vrabel@citrix.com>
To: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Ian Campbell <Ian.Campbell@citrix.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH 1/5] xen/netback: Use xenballooned pages for comms
Date: Wed, 19 Oct 2011 17:32:50 +0100 [thread overview]
Message-ID: <4E9EFBB2.6050206@citrix.com> (raw)
In-Reply-To: <4E9EE659.8090600@tycho.nsa.gov>
On 19/10/11 16:01, Daniel De Graaf wrote:
> On 10/19/2011 05:04 AM, Ian Campbell wrote:
>> On Tue, 2011-10-18 at 21:26 +0100, Daniel De Graaf wrote:
>>> For proper grant mappings, HVM guests require pages allocated using
>>> alloc_xenballooned_pages instead of alloc_vm_area.
>>>
>>> Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
>>> ---
[...]
>> Could you also explain where the requirement to use xenballooned pages
>> and not alloc_vm_area comes from in your commit message.
>
> (Will move to commit message). In PV guests, it is sufficient to only
> reserve kernel address space for grant mappings because Xen modifies the
> mappings directly. HVM guests require that Xen modify the GFN-to-MFN
> mapping, so the pages being remapped must already be allocated. Pages
> obtained from alloc_xenballooned_pages have valid GFNs not currently
> mapped to an MFN, so are available to be used in grant mappings.
Why doesn't (or can't?) Xen add new entries to the GFN-to-MFN map? Or
why hasn't it reserved a range of GFNs in the map for this?
David
next prev parent reply other threads:[~2011-10-19 16:32 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-18 20:26 [PATCH 0/5] xen/{net, blk}back support for running in HVM Daniel De Graaf
2011-10-18 20:26 ` [PATCH 1/5] xen/netback: Use xenballooned pages for comms Daniel De Graaf
2011-10-19 9:04 ` Ian Campbell
2011-10-19 10:39 ` David Vrabel
2011-10-19 15:12 ` Ian Campbell
2011-10-19 15:01 ` Daniel De Graaf
2011-10-19 16:32 ` David Vrabel [this message]
2011-10-19 16:56 ` Daniel De Graaf
2011-10-24 21:40 ` Konrad Rzeszutek Wilk
2011-10-24 21:47 ` Daniel De Graaf
2011-10-24 22:08 ` Konrad Rzeszutek Wilk
2011-10-24 22:24 ` Daniel De Graaf
2011-10-18 20:26 ` [PATCH 2/5] xen/netback: Enable netback on HVM guests Daniel De Graaf
2011-10-18 20:26 ` [PATCH 3/5] xen/blkback: Use xenballooned pages for mapped areas Daniel De Graaf
2011-10-18 20:26 ` [PATCH 4/5] xen/blkback: don't add m2p overrides when using autotranslated physmap Daniel De Graaf
2011-10-19 9:10 ` Ian Campbell
2011-10-18 20:26 ` [PATCH 5/5] xen/blkback: Enable blkback on HVM guests Daniel De Graaf
2011-10-20 15:35 ` [PATCH v2 0/6] xen/{net, blk}back support for running in HVM Daniel De Graaf
2011-10-20 15:35 ` [PATCH 1/6] xenbus: Support HVM backends Daniel De Graaf
2011-10-20 16:48 ` [PATCH 1/6 v2] " Daniel De Graaf
2011-10-24 21:55 ` Konrad Rzeszutek Wilk
2011-10-20 15:35 ` [PATCH 2/6] xenbus: Use grant-table wrapper functions Daniel De Graaf
2011-10-24 21:57 ` Konrad Rzeszutek Wilk
2011-10-20 15:35 ` [PATCH 3/6] xen/grant-table: Support mappings required by blkback Daniel De Graaf
2011-10-24 22:00 ` Konrad Rzeszutek Wilk
2011-10-20 15:35 ` [PATCH 4/6] xen/blkback: use grant-table.c hypercall wrappers Daniel De Graaf
2011-10-20 15:35 ` [PATCH 5/6] xen/netback: Enable netback on HVM guests Daniel De Graaf
2011-10-24 9:31 ` Ian Campbell
2011-10-24 9:31 ` Ian Campbell
2011-10-24 9:34 ` David Miller
2011-10-24 14:19 ` [Xen-devel] " Konrad Rzeszutek Wilk
2011-10-20 15:35 ` [PATCH 6/6] xen/blkback: Enable blkback " Daniel De Graaf
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