Hello,
Before I start, my system details are:-
Host
Ubuntu 17.04
Linux Kernel - 4.11.3
CPU x86_64 (Broadwell)
Guest
Ubuntu 16.04
Linux Kernel -4.4.0-62-generic
CPU x86_64 (default)
I have been trying to load a QEMU snapshot with KVM enabled but I always
seem to be hitting the below error :-
KVM: entry failed, hardware error 0x80000021
If you're running a guest on an Intel machine without unrestricted mode
support, the failure can be most likely due to the guest entering an invalid
state for Intel VT. For example, the guest maybe running in big real mode
which is not supported on less recent Intel processors.
Basically I am following the below steps :
1. I will start QEMU first without KVM, I will run a workload and then I
create a snapshot (using SAVEVM).
2. Once I am done, I allow the workload to complete and then quit QEMU.
3. Next time, I try to load this snapshot back while booting QEMU and at
the same time, enable-KVM as well. I use the below command :-
./qemu-system-x86_64 -m 10G -enable-kvm -machine pc-i440fx-2.8 -drive
file=~/os-images-for-qemu/ubuntu16.04.server.qcow2,format=qcow2 -loadvm
twenty-three
4. After this, I get the above error as mentioned.
I am using the same machine configuration while saving and loading. I
only change the flags to disable kvm when saving and enable-kvm while
loading.
I would like to know if there are steps in place to resolve this issue.
I have already tried loading the kvm_intel module with the parameter
emulate_invalid_guest_state=0. But that did not help at all.
Thanks.
Arnab
