WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] [PATCH] Support swap a page from user space tools -- Was RE:

To: "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Subject: [Xen-devel] [PATCH] Support swap a page from user space tools -- Was RE: [RFC][PATCH] Basic support for page offline
From: "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>
Date: Wed, 18 Mar 2009 18:24:44 +0800
Accept-language: en-US
Acceptlanguage: en-US
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx>
Delivery-date: Wed, 18 Mar 2009 03:26:28 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <E2263E4A5B2284449EEBD0AAB751098401C781605D@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20090213170341.GC17060@xxxxxxxxxxxxxxxxxxxxx> <E2263E4A5B2284449EEBD0AAB751098401C796A70E@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20090216143122.GD17060@xxxxxxxxxxxxxxxxxxxxx> <E2263E4A5B2284449EEBD0AAB751098401C7A47FED@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20090218152020.GB28209@xxxxxxxxxxxxxxxxxxxxx> <E2263E4A5B2284449EEBD0AAB751098401C7AAC751@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <E2263E4A5B2284449EEBD0AAB751098401C7AAC886@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20090302115607.GA6322@xxxxxxxxxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcmbLeVuBSkyGyEFQO+w5RGYiVVlnQBdEAIAAsPYuaA=
Thread-topic: [PATCH] Support swap a page from user space tools -- Was RE: [RFC][PATCH] Basic support for page offline
Tim, this is the implementation as discussed.
The swap_page.patch is for HV side change, basically it call the mod_lx_entry 
to update the table.
The free_page.patch is the function from user space tools to offlien a page.

Thanks
Yunhong Jiang

Jiang, Yunhong <> wrote:
> Tim Deegan <mailto:Tim.Deegan@xxxxxxxxxx> wrote:
>> At 14:37 +0000 on 19 Feb (1235054276), Jiang, Yunhong wrote:
>>> 
>>>>> It should be possible to have the tools do all the PTE manipulations
>>>>> with MMU update hypercalls (I think -- Keir may correct me here). Then
>>>>> the final hypercall to surrender the page will fail if the grant tables
>>>>> are wrong; if it does, put the PTEs back and fall back to a live
>>>>> migration.  Isn't that what your in-xen code does anyway?
>>> 
>>> Tim, after checking the code more carefully, seems currently
>> the MMU update hypercalls (including mod_lx_entry ) assume it
>> is for current domain, while in our usage model, it will
>> update MMU for other domain, so I will try to do following
>> changes: 1) change mod_lx_entry() to get a domain parameter 2)
>> Add a new hypercall (or a new command to do_mmu_update ) to
>> update the MMU for other domain. I'm not sure if there are
>> other usage model for such requirement, and if such changes
>> acceptable? Any feedback is welcome.
>>> 
>> 
>> Sorry for the delay -- I was travelling around the summit and this got
>> lost.  Yes, I think this is an OK approach.  I doubt there will be many
>> other users of such a hypercall since most OSes will get upset by their
>> PTEs changing under their feet, but I prefer it to the current patch.
> 
> Sure, I will do this way.
> 
> Thanks
> Yunhong Jiang
> 
>> 
>> Cheers,
>> 
>> Tim.
>> 
>> --
>> Tim Deegan <Tim.Deegan@xxxxxxxxxx>
>> Principal Software Engineer, Citrix Systems (R&D) Ltd.
>> [Company #02300071, SL9 0DZ, UK.]

Attachment: swap_page.patch
Description: swap_page.patch

Attachment: free_page.patch
Description: free_page.patch

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
<Prev in Thread] Current Thread [Next in Thread>