2.6.32 guest with paravirt clock enabled hangs on 2.6.37.6 host (w qemu-kvm-0.13.0)

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Hello everyboy,
while installing new virt machine today, I noticed that 2.6.32 x86_64 SMP guests are hanging if they have paravirt-clock enabled...
Either they don't finish booting at all, or boot but hang soon after..
Such a hanged guest fully loads all host cpus..
The host is 6core x86_64 runnig 2.6.37.6 with 24GB RAM.

kvm_stat:

 kvm_exit(EXTERNAL_INTERRUPT)                 15682    1643
 kvm_exit                                     15514    1643
 kvm_entry                                    15416    1643
 kvm_set_irq                                      1	  0
 kvm_msi_set_irq                                  1	  0
 kvm_apic_accept_irq                              1	  0
 kvm_exit(VMCLEAR)                                6       0
 kvm_exit(VMON)                                   6       0
 kvm_exit(PAUSE_INSTRUCTION)                      5       0
 kvm_exit(MCE_DURING_VMENTRY)                     5       0
 kvm_exit(MWAIT_INSTRUCTION)                      5       0
 kvm_exit(DR_ACCESS)                              5       0
 kvm_exit(EPT_VIOLATION)                          5       0
 kvm_exit(NMI_WINDOW)                             5       0
 kvm_exit(VMPTRLD)                                5       0
 kvm_exit(TASK_SWITCH)                            5       0
 kvm_exit(VMREAD)                                 5       0
 kvm_exit(VMLAUNCH)                               5       0
 kvm_exit(RDPMC)                                  5       0

perf top:
               16.00 10.9% add_preempt_count        [kernel.kallsyms]                                        
               16.00 10.9% do_raw_spin_lock         [kernel.kallsyms]                                        
               15.00 10.2% sub_preempt_count        [kernel.kallsyms]                                        
                8.00  5.4% irq_exit                 [kernel.kallsyms]                                        
                7.00  4.8% vmx_vcpu_run             /lib/modules/2.6.37lb.09/kernel/arch/x86/kvm/kvm-intel.ko
                7.00  4.8% page_fault               [kernel.kallsyms]                                        
                5.00  3.4% mempool_free             [kernel.kallsyms]                                        

info registers:
RAX=0000000000f42400 RBX=ffffffff81533f00 RCX=0000000000000016 RDX=00077358f5000000
RSI=000000001dcd6500 RDI=0000000000000001 RBP=ffff880009a03ee8 RSP=ffff880009a03ee8
R8 =0000000000000016 R9 =000000000000000a R10=00000000ffffffff R11=0000000000000000
R12=2a4d17d38f3303c1 R13=ffffffff815fd000 R14=ffffffff81592140 R15=0000000000093510
RIP=ffffffff810767cb RFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA]
SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0000 0000000000000000 000fffff 00000000
GS =0000 ffff880009a00000 000fffff 00000000
LDT=0000 0000000000000000 000fffff 00000000
TR =0040 ffff880009a11880 00002087 00008b00 DPL=0 TSS64-busy
GDT=     ffff880009a04000 0000007f
IDT=     ffffffff815fd000 00000fff
CR0=8005003b CR2=00007f424e540700 CR3=000000021690c000 CR4=000006f0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000d01
FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80
FPR0=0000000000000000 0000 FPR1=0000000000000000 0000
FPR2=0000000000000000 0000 FPR3=0000000000000000 0000
FPR4=0000000000000000 0000 FPR5=0000000000000000 0000
FPR6=0000000000000000 0000 FPR7=0000000000000000 0000
XMM00=00000000000000000000000000000000 XMM01=0000000000000000000000003c23d70a
XMM02=00000000000000000000000000000000 XMM03=00000000000000000000000000000000
XMM04=00000000000000000000000000000000 XMM05=00000000000000000000000000000000
XMM06=00000000000000000000000000000000 XMM07=00000000000000000000000000000000
XMM08=00000000000000000000000000000000 XMM09=00000000000000000000000000000000
XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000
XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000
XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000

info cpus:
* CPU #0: pc=0xffffffff8105d4a0 thread_id=19639 
  CPU #1: pc=0xffffffff81013140 thread_id=19640 
  CPU #2: pc=0xffffffff8102a1b6 (halted) thread_id=19641 
  CPU #3: pc=0xffffffff81341521 thread_id=19642 
  CPU #4: pc=0xffffffff810415d8 thread_id=19643 
  CPU #5: pc=0xffffffff811ca521 thread_id=19644 
  CPU #6: pc=0xffffffff81013140 thread_id=19646 
  CPU #7: pc=0xffffffff8102a1b6 (halted) thread_id=19647 


and here are trace-cmds for all cpus:
http://nik.lbox.cz/public/trace-cmd.tar.bz2

Could somebody please have a look at this?

I also tried 2.6.38.5, but the result is the same...

cheers
nik




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