Re: [Xen-devel] [BUG] Rhel7u2 guest with kernel 4.6.0 restore and migrate failed

[Wei Liu <wei.liu2@xxxxxxxxxx>]

CC Anthony and Stefano

Anthony, I think this is also related to the QEMU mainline migration
failure.

On Mon, Jun 13, 2016 at 05:59:48AM +0000, Zhang, PengtaoX wrote:
> Bug detailed description:
> ----------------
> 1. Rhel7u2 guest with kernel 4.6.0 migrate failed
> 2. Rhel7u2 guest with kernel 4.6.0 restore failed
> 3. Rhel7u2 guest with default kernel (3.10.0) can be restored and migrate 
> successfully
> 
> Environment :
> ----------------
> HW: Skylake-SP
> Xen: Xen 4.7.0 RC4
> Dom0: Linux 4.5.2 stable
> 
> Reproduce steps:
> ----------------
> Prepare test environment 
> 1.Install redhat 6.7 OS on Skylake-SP platform  as base OS , then compile and 
> install  ,xen and Dom0, reboot from xen .
> 2.Create a rhel7.2 guest with kernel 4.6.0 via :
>       xl create config.rhel7u2-4.6
> 
> Save/Restore test
> 1.After boot up guest with kernel 4.6.0 then :
>       xl save $dom_id $save_guest.img
> 2.After save guest do
>       xl restore $save_guest.img
> 3.Current status is guest with kernel 4.6.0 can be save successfully ,but 
> restore guest failed . Guest with default kernel can be save/restore 
> successfully .
> 
> Migrate test 
> 1. After boot up guest with kernel 4.6.0 then :
>       xl migrate $dom_id localhost 
> 2. Current status is guest with kernel 4.6.0 migrate failed . Guest with 
> default kernel can be migrate successfully .
> 
> Base error log:
> ----------------
> rhel7u2_4.6.0_SR_fail.log file only for Save/Restore test , other log file 
> are for migrate test .
> 
> 
> Regards,
> Pengtao
> 
> 


In the QEMU log file:

  qemu-system-i386: Expected vmdescription section, but got 0

That means should_send_vmdesc() returns true in migration/savevm.c.

It could be that we need to explicitly set supress_vmdesc in machine
description.

Does the following hack make it work?

Wei.

---
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 631bd8d..8556116 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -469,6 +469,7 @@ static void pc_xen_hvm_init(MachineState *machine)
     if (bus != NULL) {
         pci_create_simple(bus, -1, "xen-platform");
     }
+    machine->suppress_vmdesc = true;
 }
 #endif


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