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* [BUG] Rhel7u2 guest with kernel 4.6.0 restore and migrate failed
@ 2016-06-13  5:59 Zhang, PengtaoX
  2016-06-13  8:07 ` Wei Liu
  0 siblings, 1 reply; 4+ messages in thread
From: Zhang, PengtaoX @ 2016-06-13  5:59 UTC (permalink / raw)
  To: 'Xen-devel'; +Cc: Lan, Tianyu, Han, Huaitong, Hao, Xudong

[-- Attachment #1: Type: text/plain, Size: 1293 bytes --]

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



[-- Attachment #2: config.rhel7u2_4.6 --]
[-- Type: application/octet-stream, Size: 2012 bytes --]

# =====================================================================
# Example HVM guest configuration
# =====================================================================
#
# This is a fairly minimal example of what is required for an
# HVM guest. For a more complete guide see xl.cfg(5)

# This configures an HVM rather than PV guest
builder = "hvm"

# Guest name
name = "RHEL7.2_PKEYs.hvm"

# 128-bit UUID for the domain as a hexadecimal number.
# Use "uuidgen" to generate one if required.
# The default behavior is to generate a new UUID each time the guest is started.
#uuid = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"

# Enable Microsoft Hyper-V compatibile paravirtualisation /
# enlightenment interfaces. Turning this on can improve Windows guest
# performance and is therefore recommended
#viridian = 1

# Initial memory allocation (MB)
memory = 8192

# Maximum memory (MB)
# If this is greater than `memory' then the slack will start ballooned
# (this assumes guest kernel support for ballooning)
#maxmem = 512

# Number of VCPUS
vcpus = 32

# Network devices
# A list of 'vifspec' entries as described in
# docs/misc/xl-network-configuration.markdown
#vif = [ 'model=e1000,bridge=xenbr0' ]
#vif = [ 'model=e1000,bridge=xenbr0' ]
#vif = [ 'type=ioemu, mac=a0:36:9f:40:98:66, bridge=xenbr0' ]
vif = [ 'type=ioemu, mac=00:16:3e:1b:3f:4d, bridge=xenbr0' ]

# Disk Devices
# A list of `diskspec' entries as described in
# docs/misc/xl-disk-configuration.txt
#disk = [ '/root/robert/rhel7.2_avx512.qcow2,qcow2,hda,rw','/dev/vg_knl1/guest_addtional_disk,raw,hdb,rw','/dev/vg_knl1/guest_boot,raw,hdd,rw' ]
disk = [ '/share/xvs/var/img.rhel7u2_xen,qcow2,hda,rw' ]
boot = "c"
# Guest VGA console configuration, either SDL or VNC
#sdl = 1
vnc = 1
#vnclisten = 192.168.199.187:3
#
xen_platform_pci=0
serial = "pty"
#device_model_version = 'qemu-xen'
#device_model_override = '/usr/local/lib/xen/bin/qemu-system-i386'
#stdvga=1
hap=1
acpi=1
#pci = [ '04:10.2','04:10.4' ]
#hpet=1
usb=1
usbdevice=[ 'tablet' ]


[-- Attachment #3: qemu-dm-RHEL7.2_xen.hvm.log --]
[-- Type: application/octet-stream, Size: 98 bytes --]

char device redirected to /dev/pts/5 (label serial0)
qemu: terminating on signal 1 from pid 21711

[-- Attachment #4: qemu-dm-RHEL7.2_xen.hvm--incoming.log --]
[-- Type: application/octet-stream, Size: 503 bytes --]

char device redirected to /dev/pts/9 (label serial0)
xen_ram_alloc: do not alloc 10f800000 bytes of ram at 0 when runstate is INMIGRATE
xen_ram_alloc: do not alloc 800000 bytes of ram at 10f800000 when runstate is INMIGRATE
xen_ram_alloc: do not alloc 10000 bytes of ram at 110000000 when runstate is INMIGRATE
xen_ram_alloc: do not alloc 40000 bytes of ram at 110010000 when runstate is INMIGRATE
qemu-system-i386: Expected vmdescription section, but got 0
qemu: terminating on signal 1 from pid 22064

[-- Attachment #5: rhel7u2_3.10.0_lm_pass.log --]
[-- Type: application/octet-stream, Size: 2802 bytes --]

[root@skl-sp2 ~]# /usr/local/lib/xen/bin/qemu-img create -b /share/xvs/img/linux/ia32e_rhel7u2.img -f qcow2 /share/xvs/var/img.rhel7u2
Formatting '/share/xvs/var/img.rhel7u2', fmt=qcow2 size=16106127360 backing_file='/share/xvs/img/linux/ia32e_rhel7u2.img' encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16
[root@skl-sp2 ~]#
[root@skl-sp2 ~]# vim config.vmxCPL_LM_01
[root@skl-sp2 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096    64     r-----    2300.6
vCPL_LM_01_1465181018                       14  1024     2     -b----      20.1
[root@skl-sp2 ~]# xl des 14
[root@skl-sp2 ~]#
[root@skl-sp2 ~]#
[root@skl-sp2 ~]#
[root@skl-sp2 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096    64     r-----    2302.8
[root@skl-sp2 ~]# xl cr config.vmxCPL_LM_01
Parsing config from config.vmxCPL_LM_01
[root@skl-sp2 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096    64     r-----    2326.4
vCPL_LM_rhel7u2                             15  1024     2     r-----       8.0
[root@skl-sp2 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096    64     r-----    2510.2
vCPL_LM_rhel7u2                             15  1024     2     -b----      78.8
[root@skl-sp2 ~]# xl migrate vCPL_LM_rhel7u2 localhost
root@localhost's password:
migration target: Ready to receive domain.
Saving to migration stream new xl format (info 0x3/0x0/1522)
Loading new save file <incoming migration stream> (new xl fmt info 0x3/0x0/1522)
 Savefile contains xl domain config in JSON format
Parsing config from <saved>
xc: info: Saving domain 15, type x86 HVM
xc: info: Found x86 HVM domain from Xen 4.7
xc: info: Restoring domain
xc: info: Restore successful
xc: info: XenStore: mfn 0xfeffc, dom 0, evt 1
xc: info: Console: mfn 0xfefff, dom 0, evt 2
migration target: Transfer complete, requesting permission to start domain.
migration sender: Target has acknowledged transfer.
migration sender: Giving target permission to start.
migration target: Got permission, starting domain.
migration target: Domain started successsfully.
migration sender: Target reports successful startup.
Migration successful.
[root@skl-sp2 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096    64     r-----    2550.2
vCPL_LM_rhel7u2                             16  1024     2     -b----       1.0
[root@skl-sp2 ~]#

[-- Attachment #6: rhel7u2_4.6.0_SR_fail.log --]
[-- Type: application/octet-stream, Size: 4171 bytes --]

[root@skl-sp1 ~]# rpm -qa xen
xen-4.7.0rc4sklserver_20160527-1.x86_64
[root@skl-sp1 ~]#
[root@skl-sp1 ~]# xl dmesg>xl_dmesg_xen-4.7.0rc4_skl_sp.log
[root@skl-sp1 ~]# uname -r
4.5.2
[root@skl-sp1 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096     4     r-----    1117.5
RHEL7.2_PKEYs.hvm                           16  8192    32     r-----     128.3
[root@skl-sp1 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096     4     r-----    1132.2
RHEL7.2_PKEYs.hvm                           16  8192    32     r-----     214.5
[root@skl-sp1 ~]#
[root@skl-sp1 ~]# /usr/local/lib/xen/bin/qemu-img create -b /share/xvs/img/linux/ia32e_rhel7u2_xen.img -f qcow2 /share/xvs/var/rhel7u2_xen.qcow2
Formatting '/share/xvs/var/rhel7u2_xen.qcow2', fmt=qcow2 size=16106127360 backing_file='/share/xvs/img/linux/ia32e_rhel7u2_xen.img' encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16
[root@skl-sp1 ~]#
[root@skl-sp1 ~]# vim xl
xl_dmesg_xen-4.7.0rc4_skl_sp.log  xlexample.hvm
[root@skl-sp1 ~]# vim xlexample.hvm
[root@skl-sp1 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096     4     r-----    1138.7
[root@skl-sp1 ~]# xl cr xlexample.hvm
Parsing config from xlexample.hvm
[root@skl-sp1 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096     4     r-----    1189.4
RHEL7.2_PKEYs.hvm                           17  8192    32     -b----      86.9
[root@skl-sp1 ~]# xl save RHEL7.2_PKEYs.hvm RHEL7.2_PKEYs.hvm.img
Saving to RHEL7.2_PKEYs.hvm.img new xl format (info 0x3/0x0/1957)
xc: info: Saving domain 17, type x86 HVM
xc: Frames: 2162768/2162768  100%
xc: End of stream: 0/0    0%
[root@skl-sp1 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096     4     r-----    1231.8
[root@skl-sp1 ~]# xl restore
'xl restore' requires at least 1 argument.

Usage: xl [-vf] restore [options] [<ConfigFile>] <CheckpointFile>

Restore a domain from a saved state.

Options:

-h                       Print this help.
-p                       Do not unpause domain after restoring it.
-e                       Do not wait in the background for the death of the domain.
-d                       Enable debug messages.
-V, --vncviewer          Connect to the VNC display after the domain is created.
-A, --vncviewer-autopass Pass VNC password to viewer via stdin.
[root@skl-sp1 ~]# xl restore RHEL7.2_PKEYs.hvm.img
Loading new save file RHEL7.2_PKEYs.hvm.img (new xl fmt info 0x3/0x0/1957)
 Savefile contains xl domain config in JSON format
Parsing config from <saved>
xc: info: Found x86 HVM domain from Xen 4.7
xc: info: Restoring domain
xc: info: Restore successful
xc: info: XenStore: mfn 0xfeffc, dom 0, evt 1
xc: info: Console: mfn 0xfefff, dom 0, evt 2
[root@skl-sp1 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096     4     r-----    1273.6
[root@skl-sp1 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096     4     r-----    1273.7
[root@skl-sp1 ~]#
[root@skl-sp1 ~]# cat /var/log/xen/qemu-dm-RHEL7.2_PKEYs.hvm.log
char device redirected to /dev/pts/2 (label serial0)
xen_ram_alloc: do not alloc 20f800000 bytes of ram at 0 when runstate is INMIGRATE
xen_ram_alloc: do not alloc 800000 bytes of ram at 20f800000 when runstate is INMIGRATE
xen_ram_alloc: do not alloc 10000 bytes of ram at 210000000 when runstate is INMIGRATE
xen_ram_alloc: do not alloc 40000 bytes of ram at 210010000 when runstate is INMIGRATE
qemu-system-i386: Expected vmdescription section, but got 0
qemu: terminating on signal 1 from pid 15151
[root@skl-sp1 ~]#

[-- Attachment #7: rhel7u2_xen_4.6.0_migraete_fail.log --]
[-- Type: application/octet-stream, Size: 2572 bytes --]

[root@skl-sp2 ~]# /usr/local/lib/xen/bin/qemu-img create -b /share/xvs/img/linux/ia32e_rhel7u2_xen.img -f qcow2 /share/xvs/var/img.rhel7u2_xen
Formatting '/share/xvs/var/img.rhel7u2_xen', fmt=qcow2 size=16106127360 backing_file='/share/xvs/img/linux/ia32e_rhel7u2_xen.img' encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16
[root@skl-sp2 ~]#
[root@skl-sp2 ~]# cat config.rhel7u2_xen | grep disk| grep -v "^#"
disk = [ '/share/xvs/var/img.rhel7u2_xen,qcow2,hda,rw' ]
[root@skl-sp2 ~]#
[root@skl-sp2 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096    64     r-----    1417.6
[root@skl-sp2 ~]# rpm -q xen
xen-4.7.0rc4sklserver_20160527-1.x86_64
[root@skl-sp2 ~]#
[root@skl-sp2 ~]# xl cr config.rhel7u2_xen
Parsing config from config.rhel7u2_xen
[root@skl-sp2 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096    64     r-----    1475.2
RHEL7.2_xen.hvm                             13  4096     4     -b----      56.1
[root@skl-sp2 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096    64     r-----    1478.8
RHEL7.2_xen.hvm                             13  4096     4     -b----      62.0
[root@skl-sp2 ~]# xl migrate RHEL7.2_xen.hvm localhost
root@localhost's password:
migration target: Ready to receive domain.
Saving to migration stream new xl format (info 0x3/0x0/1510)
Loading new save file <incoming migration stream> (new xl fmt info 0x3/0x0/1510)
 Savefile contains xl domain config in JSON format
Parsing config from <saved>
xc: info: Saving domain 13, type x86 HVM
xc: info: Found x86 HVM domain from Xen 4.7
xc: info: Restoring domain
xc: info: Restore successful
xc: info: XenStore: mfn 0xfeffc, dom 0, evt 1
xc: info: Console: mfn 0xfefff, dom 0, evt 2
migration target: Transfer complete, requesting permission to start domain.
migration sender: Target has acknowledged transfer.
migration sender: Giving target permission to start.
migration target: Got permission, starting domain.
migration target: Domain started successsfully.
migration sender: Target reports successful startup.
Migration successful.
[root@skl-sp2 ~]# xl lis
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096    64     r-----    1609.4
[root@skl-sp2 ~]#

[-- Attachment #8: Type: text/plain, Size: 126 bytes --]

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: [BUG] Rhel7u2 guest with kernel 4.6.0 restore and migrate failed
  2016-06-13  5:59 [BUG] Rhel7u2 guest with kernel 4.6.0 restore and migrate failed Zhang, PengtaoX
@ 2016-06-13  8:07 ` Wei Liu
  2016-06-13  8:16   ` Wei Liu
  2016-06-13 10:34   ` Anthony PERARD
  0 siblings, 2 replies; 4+ messages in thread
From: Wei Liu @ 2016-06-13  8:07 UTC (permalink / raw)
  To: Zhang, PengtaoX
  Cc: Lan, Tianyu, Stefano Stabellini, Wei Liu, Hao, Xudong, Han,
	Huaitong, Anthony PERARD, 'Xen-devel'

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


> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

^ permalink raw reply related	[flat|nested] 4+ messages in thread
* Re: [BUG] Rhel7u2 guest with kernel 4.6.0 restore and migrate failed
  2016-06-13  8:07 ` Wei Liu
@ 2016-06-13  8:16   ` Wei Liu
  2016-06-13 10:34   ` Anthony PERARD
  1 sibling, 0 replies; 4+ messages in thread
From: Wei Liu @ 2016-06-13  8:16 UTC (permalink / raw)
  To: Zhang, PengtaoX
  Cc: Lan, Tianyu, Stefano Stabellini, Wei Liu, Hao, Xudong, Han,
	Huaitong, Anthony PERARD, 'Xen-devel'

On Mon, Jun 13, 2016 at 09:07:14AM +0100, Wei Liu wrote:
> 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
> 

Actually I don't think this hack makes much sense. There is no need to
try it...

I will wait for QEMU maintainers to comment on this.

Wei.

> 
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xen.org
> > http://lists.xen.org/xen-devel
> 

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: [BUG] Rhel7u2 guest with kernel 4.6.0 restore and migrate failed
  2016-06-13  8:07 ` Wei Liu
  2016-06-13  8:16   ` Wei Liu
@ 2016-06-13 10:34   ` Anthony PERARD
  1 sibling, 0 replies; 4+ messages in thread
From: Anthony PERARD @ 2016-06-13 10:34 UTC (permalink / raw)
  To: Wei Liu
  Cc: Lan, Tianyu, Stefano Stabellini, Zhang, PengtaoX, Hao, Xudong,
	Han, Huaitong, 'Xen-devel'

On Mon, Jun 13, 2016 at 09:07:14AM +0100, Wei Liu wrote:
> CC Anthony and Stefano
> 
> Anthony, I think this is also related to the QEMU mainline migration
> failure.

I don't think it is. The quote does not have anything regarding using
QEMU mainline. Also the migration failure in mainline does not affect
any release.

> 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

I've seen this log message, it does not appear to affect the migration,
as migration usully succeed and this message is always present. I
haven't investigate.

> 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.

That won't work, we should be able to use QEMU with -machine xenfv or
-machine pc,accel=xen.

-- 
Anthony PERARD

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^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2016-06-13 10:34 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-06-13  5:59 [BUG] Rhel7u2 guest with kernel 4.6.0 restore and migrate failed Zhang, PengtaoX
2016-06-13  8:07 ` Wei Liu
2016-06-13  8:16   ` Wei Liu
2016-06-13 10:34   ` Anthony PERARD

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