x86 cpu nx feature: guest reboots after migrate exec

[svkh]

Using instruction on
http://www.linux-kvm.org/page/Migration
I save VM state to external file and try load it, but VM starts, shows saved screen and reboots immediatly.

Cmdline for vm state saving:

$ sudo ./i386-softmmu/qemu-system-i386 -machine accel=kvm,kernel_irqchip=on -enable-kvm -m 512 -hda image.raw -vga std -net none -M pc -monitor stdio -cpu SandyBridge
(or -cpu "n270" , or "kvm32,+sse2,+pae,+nx")

Monitor cmd:
(qemu) stop
(qemu) migrate_set_speed 4095m
(qemu) migrate "exec:gzip -c > STATEFILE.gz"
(qemu) q

Cmdline for vm state loading:

$ sudo ./i386-softmmu/qemu-system-i386 -machine accel=kvm,kernel_irqchip=on -enable-kvm -m 512 -hda image.raw -vga std -net none -M pc -monitor stdio -cpu SandyBridge -incoming "exec: gzip -c -d STATEFILE.gz"
(or -cpu "n270" , or "kvm32,+sse2,+pae,+nx")

If I do the same without NX cpu feature (-cpu option "n270,-nx" / "SandyBridge,-nx" / "kvm32,+pae,+sse2") or on qemu-system-x86_64, VM save/load works correctly.

Log kvm-all.c, DEBUG_KVM=y:

QEMU 2.0.0 monitor - type 'help' for more information
(qemu) kvm_init_vcpu
...handle_io.../...handle_mmio...
kvm_cpu_exec()
shutdown
kvm_cpu_exec()
interrupt exit requested
io window exit
kvm_cpu_exec()

Host:

 $ lsb_release -rd
 Description: Ubuntu 12.04.4 LTS
 Release: 12.04

 $ uname -a
 Linux <username> 3.8.0-38-generic #56~precise1 SMP Tue Apr 22 12:46:44 MSK 2014 x86_64 x86_64 x86_64 GNU/Linux

Guest:
 1. Ubuntu 12.04 32bit
 2. WIndows 8 32bit

Qemu: v2.0.0
commit a9e8aeb3755bccb7b51174adcf4a3fc427e0d147
Author: Peter Maydell <email address hidden>
Date: Thu Apr 17 13:41:45 2014 +0100

[Thomas Huth (th-huth)]

Looking through old bug tickets... can you still reproduce this issue with the latest version of QEMU? Or could we close this ticket nowadays?

[Launchpad Janitor (janitor)]

[Expired for QEMU because there has been no activity for 60 days.]