Re: [Xen-devel] live migration from new platform to old platform

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 07/06/16 08:02, Hao, Xudong wrote:
> Does anyone experience for HVM live migration from new generation platform to 
> old generation platform? For X86 got a failure from Broadwell to Haswell, 
> both platforms used same Xen version 4.7.0 RC3.
>
> [root@bdw-ep1 feng]# xl migrate 21 hsw-ep1 
> ...
> migration target: Ready to receive domain.
> Saving to migration stream new xl format (info 0x3/0x0/1537) Loading new save 
> file <incoming migration stream> (new xl fmt info 0x3/0x0/1537)  Savefile 
> contains xl domain config in JSON format Parsing config from <saved>
> xc: info: Saving domain 21, type x86 HVM
> xc: info: Found x86 HVM domain from Xen 4.7
> xc: info: Restoring domain
> xc: error: Unable to restore HVM context (1 = Operation not permitted): 
> Internal error
> xc: error: Restore failed (1 = Operation not permitted): Internal error
> libxl: error: libxl_stream_read.c:852:libxl__xc_domain_restore_done: 
> restoring domain: Operation not permitted
> libxl: error: libxl_create.c:1220:domcreate_rebuild_done: cannot (re-)build 
> domain: -3
> libxl: error: libxl.c:1564:libxl__destroy_domid: non-existant domain 31
> libxl: error: libxl.c:1523:domain_destroy_callback: unable to destroy guest 
> with domid 31
> libxl: error: libxl.c:1452:domain_destroy_cb: destruction of domain 31 failed 
> migration target: Domain creation failed (code -3).
> libxl: error: libxl_utils.c:507:libxl_read_exactly: file/stream truncated 
> reading ready message from migration receiver stream
> libxl: info: libxl_exec.c:118:libxl_report_child_exitstatus: migration 
> transport process [20867] exited with error status 1 Migration failed, 
> resuming at sender.

I see you have a solution to this problem.

In general, `xl dmesg` on hsw-ep1 will provide some information as to
why the restore failed.  Given your hardware, I expect the problem was
with CR4.SMAP.

~Andrew

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