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x86: 0.970
KVM: 0.936
architecture: 0.931
performance: 0.915
hypervisor: 0.910
kernel: 0.909
device: 0.908
i386: 0.907
ppc: 0.898
graphic: 0.873
socket: 0.829
register: 0.815
files: 0.813
risc-v: 0.810
boot: 0.807
VMM: 0.793
PID: 0.787
peripherals: 0.762
vnc: 0.756
mistranslation: 0.732
virtual: 0.703
permissions: 0.693
arm: 0.681
debug: 0.668
network: 0.638
semantic: 0.623
user-level: 0.582
TCG: 0.574
assembly: 0.343
x86 cpu nx feature: guest reboots after migrate exec
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
Looking through old bug tickets... can you still reproduce this issue with the latest version of QEMU? Or could we close this ticket nowadays?
[Expired for QEMU because there has been no activity for 60 days.]
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