[Xen-devel] [xl restore and migrating problem - hardware compatibility]

["Ing. Ricardo Brisighelli" <ricardo@xxxxxxxxxxxxx>]

Hi, i'm gentoo user and try with xen 4.6.3 and 4.7.1 in both version have the 
same problem. 

My cpu is AMD A10-7860K

I run VM as PVlinux, then try migrate to other server (same hardware) and dont 
work, same occurs when try restore a saved VM, but this works well (migrate 
and restore) if run VM as HVM.

I try same instalation in cpu Intel I7-4790 and ir works well VM as PVlinux 
and HVM

Hardware Problem
#cat /proc/cpuinfo (only last core)
proprocessor    : 3 
vendor_id       : AuthenticAMD 
cpu family      : 21 
model           : 56 
model name      : AMD A10-7860K Radeon R7, 12 Compute Cores 4C+8G 
stepping        : 1 
microcode       : 0x6003106 
cpu MHz         : 3591.088 
cache size      : 2048 KB 
physical id     : 0 
siblings        : 4 
core id         : 3 
cpu cores       : 4 
apicid          : 0 
initial apicid  : 3 
fpu             : yes 
fpu_exception   : yes 
cpuid level     : 13 
wp              : yes 
flags           : fpu de tsc msr pae mce cx8 apic mca cmov pat clflush mmx 
fxsr sse sse2 ht syscall nx mmxext fxsr_opt l
m constant_tsc rep_good nopl nonstop_tsc extd_apicid eagerfpu pni pclmulqdq 
ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsav
e avx f16c hypervisor lahf_lm cmp_legacy extapic cr8_legacy abm sse4a 
misalignsse 3dnowprefetch xop fma4 tce tbm perfctr
_core perfctr_nb bpext arat cpb hw_pstate vmmcall fsgsbase bmi1 xsaveopt 
bugs            : fxsave_leak 
bogomips        : 7182.17 
TLB size        : 1536 4K pages 
clflush size    : 64 
cache_alignment : 64 
address sizes   : 48 bits physical, 48 bits virtual 
power management: ts ttp tm 100mhzsteps hwpstate cpb eff_freq_ro [13]

Migration problem:

#xl migrate fs dstdomain
migration target: Ready to receive domain. 
Saving to migration stream new xl format (info 0x3/0x0/1307) 
Loading new save file <incoming migration stream> (new xl fmt info 
0x3/0x0/1307) 
Savefile contains xl domain config in JSON format 
Parsing config from <saved> 
xc: info: Saving domain 5, type x86 PV 
xc: info: Found x86 PV domain from Xen 4.6 
xc: info: Restoring domain 
xc: error: X86_PV_VCPU_MSRS record truncated: length 8, min 9: Internal error 
xc: error: Restore failed (0 = Success): Internal error 
libxl: error: libxl_stream_read.c:749:libxl__xc_domain_restore_done: restoring 
domain: Success 
libxl: error: libxl_create.c:1144:domcreate_rebuild_done: cannot (re-)build 
domain: -3 
libxl: error: libxl.c:1610:libxl__destroy_domid: non-existant domain 1 
libxl: error: libxl.c:1568:domain_destroy_callback: unable to destroy guest 
with domid 1 
libxl: error: libxl.c:1495:domain_destroy_cb: destruction of domain 1 failed 
migration target: Domain creation failed (code -3). 
libxl: error: libxl_utils.c:430: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 [4250] exited with error status
3 
Migration failed, resuming at sender.


Save and restore problem:

#xl save fs fs.snap
Saving to fs.snap new xl format (info 0x3/0x0/1307) 
xc: info: Saving domain 5, type x86 PV 
xc: Frames: 131072/131072  100% 
xc: End of stream: 0/0    0%

#xl restore fs.snap
Loading new save file fs.snap (new xl fmt info 0x3/0x0/1307) 
Savefile contains xl domain config in JSON format 
Parsing config from <saved> 
xc: info: Found x86 PV domain from Xen 4.6 
xc: info: Restoring domain 
xc: error: X86_PV_VCPU_MSRS record truncated: length 8, min 9: Internal error 
xc: error: Restore failed (0 = Success): Internal error 
libxl: error: libxl_stream_read.c:749:libxl__xc_domain_restore_done: restoring 
domain: Success 
libxl: error: libxl_create.c:1144:domcreate_rebuild_done: cannot (re-)build 
domain: -3 
libxl: error: libxl.c:1610:libxl__destroy_domid: non-existant domain 6 
libxl: error: libxl.c:1568:domain_destroy_callback: unable to destroy guest 
with domid 6 
libxl: error: libxl.c:1495:domain_destroy_cb: destruction of domain 6 failed


#verify-stream-v2 -v -f xl -i  fs.snap     
Processed xl header 
Libxl Header: little endian 
Libxl Record: Libxc context, length 0 
Libxc Image Header: little endian 
Domain Header: x86 PV from Xen 4.6 
Libxc Record: x86 PV info, length 8 
 64bit guest, 4 levels of pagetables 
Libxc Record: x86 PV P2M frames, length 2056 
 Start pfn 0x0, End 0x1ffff 
Squashed 128 Page Data records together 
Libxc Record: TSC info, length 24 
 Mode 0, 3591089 kHz, 1189155414000 ns, incarnation 1 
Libxc Record: Shared info, length 4096 
Libxc Record: x86 PV vcpu basic, length 5176 
 vcpu0 basic context, 5168 bytes 
Libxc Record: x86 PV vcpu extended, length 64 
 vcpu0 extended context, 56 bytes 
Libxc Record: x86 PV vcpu xsave, length 856 
 vcpu0 xsave context, 848 bytes 
Libxc Record: x86 PV vcpu msrs, length 8 
Stream Error: 
Traceback (most recent call last): 
 File "/usr/libexec/xen/bin/verify-stream-v2", line 82, in read_stream 
   VerifyLibxl(info, stream_read).verify() 
 File "/usr/lib64/python2.7/site-packages/xen/migration/libxl.py", line 82, in 
verify 
   while self.verify_record() != REC_TYPE_end: 
 File "/usr/lib64/python2.7/site-packages/xen/migration/libxl.py", line 136, 
in verify_record 
   record_verifiers[rtype](self, content[:length]) 
 File "/usr/lib64/python2.7/site-packages/xen/migration/libxl.py", line 155, 
in verify_record_libxc_context 
   VerifyLibxc(self.info, self.read).verify() 
 File "/usr/lib64/python2.7/site-packages/xen/migration/libxc.py", line 132, 
in verify 
   while self.verify_record() != REC_TYPE_end: 
 File "/usr/lib64/python2.7/site-packages/xen/migration/libxc.py", line 227, 
in verify_record 
   record_verifiers[rtype](self, content[:length]) 
 File "/usr/lib64/python2.7/site-packages/xen/migration/libxc.py", line 429, 
in <lambda> 
   VerifyLibxc.verify_record_x86_pv_vcpu_generic(s, x, "msrs"), 
 File "/usr/lib64/python2.7/site-packages/xen/migration/libxc.py", line 323, 
in verify_record_x86_pv_vcpu_generic 
   " bytes long" % (name, minsz)) 
RecordError: X86_PV_VCPU_msrs record length must be at least 8 bytes long




Hardware works correcltly
#cat /proc/cpuinfo (last core)
Processor       : 7 
vendor_id       : GenuineIntel 
cpu family      : 6 
model           : 60 
model name      : Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz 
stepping        : 3 
microcode       : 0x1c 
cpu MHz         : 3600.098 
cache size      : 8192 KB 
physical id     : 0 
siblings        : 8 
core id         : 3 
cpu cores       : 4 
apicid          : 7 
initial apicid  : 7 
fpu             : yes 
fpu_exception   : yes 
cpuid level     : 13 
wp              : yes 
flags           : fpu de tsc msr pae mce cx8 apic sep mca cmov pat clflush 
acpi mmx fxsr sse sse2 ss ht syscall nx lm co
nstant_tsc arch_perfmon rep_good nopl nonstop_tsc eagerfpu pni pclmulqdq 
monitor est ssse3 sdbg fma cx16 sse4_1 sse4_2 m
ovbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm 
abm ida arat pln pts dtherm fsgsbase bmi1 av
x2 bmi2 erms xsaveopt                                                           
                                         
bugs            :                                                               
                                         
bogomips        : 7200.19                                                       
                                         
clflush size    : 64           


Regards.

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