Xen live migration

Xen live migration

[MaoXiaoyun]

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Hi:
 
   I've been noticed that intel XSAVE is disabled in Xen source.
  Does this mean live migration is temporarily  not support right now? 
  Is it for buggy reason, will be enable again someday later?
 
  thanks. 		 	   		  

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Re: Xen live migration

[Keir Fraser]

On 19/04/2011 14:05, "MaoXiaoyun" <tinnycloud@hotmail.com> wrote:

> Hi:
>  
>    I've been noticed that intel XSAVE is disabled in Xen source.
>   Does this mean live migration is temporarily  not support right now?
>   Is it for buggy reason, will be enable again someday later?

XSAVE doesn't have anything to do with live migration.

 -- Keir

>   thanks.
>        
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

Re: Xen live migration

[Tim Deegan]

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At 14:20 +0100 on 19 Apr (1303222807), Keir Fraser wrote:
> On 19/04/2011 14:05, "MaoXiaoyun" <tinnycloud@hotmail.com> wrote:
> 
> > Hi:
> >  
> >    I've been noticed that intel XSAVE is disabled in Xen source.
> >   Does this mean live migration is temporarily  not support right now?
> >   Is it for buggy reason, will be enable again someday later?
> 
> XSAVE doesn't have anything to do with live migration.

XSAVE was disabled in 22084:ae0cd4e5cc01 because the original XSAVE
support didn't include saving/restoring XSAVE contexts (i.e. it broke
live migration).  The changeset that added that support didn't re-enable
xsave. :(

The attached patch is the missing change to re-enable it by default
(totally untested). 

Cheers,

Tim.

-- 
Tim Deegan <Tim.Deegan@citrix.com>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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xen/x86: re-enable xsave by default
now that it supports live migration. 

Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>

diff -r 3539ef956a37 xen/arch/x86/cpu/common.c
--- a/xen/arch/x86/cpu/common.c	Mon Apr 18 18:34:45 2011 +0100
+++ b/xen/arch/x86/cpu/common.c	Wed Apr 20 10:18:56 2011 +0100
@@ -18,7 +18,7 @@
 static int cachesize_override __cpuinitdata = -1;
 size_param("cachesize", cachesize_override);
 
-static bool_t __cpuinitdata use_xsave;
+static bool_t __cpuinitdata use_xsave = 1;
 boolean_param("xsave", use_xsave);
 unsigned int __devinitdata opt_cpuid_mask_ecx = ~0u;
 integer_param("cpuid_mask_ecx", opt_cpuid_mask_ecx);

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