Re: Migration failure when running nested VMs

2019-09-23 Thread Paolo Bonzini
On 23/09/19 20:32, Jintack Lim wrote: > On Mon, Sep 23, 2019 at 4:48 AM Paolo Bonzini wrote: >> >> On 23/09/19 12:42, Dr. David Alan Gilbert wrote: >>> >>> With those two clues, I guess maybe some dirty pages made by L2 are >>> not transferred to the destination correctly, but I'm not really sure.

Re: Migration failure when running nested VMs

2019-09-23 Thread Jintack Lim
On Mon, Sep 23, 2019 at 3:42 AM Dr. David Alan Gilbert wrote: > > * Jintack Lim (incredible.t...@gmail.com) wrote: > > Hi, > > Copying in Paolo, since he recently did work to fix nested migration - > it was expected to be broken until pretty recently; but 4.1.0 qemu on > 5.3 kernel is pretty new,

Re: Migration failure when running nested VMs

2019-09-23 Thread Jintack Lim
On Mon, Sep 23, 2019 at 4:48 AM Paolo Bonzini wrote: > > On 23/09/19 12:42, Dr. David Alan Gilbert wrote: > > > > With those two clues, I guess maybe some dirty pages made by L2 are > > not transferred to the destination correctly, but I'm not really sure. > > > > 3) It happens on Intel(R) Xeon(R)

Re: Migration failure when running nested VMs

2019-09-23 Thread Paolo Bonzini
On 23/09/19 12:42, Dr. David Alan Gilbert wrote: > > With those two clues, I guess maybe some dirty pages made by L2 are > not transferred to the destination correctly, but I'm not really sure. > > 3) It happens on Intel(R) Xeon(R) Silver 4114 CPU, but it does not on > Intel(R) Xeon(R) CPU E5-263

Re: Migration failure when running nested VMs

2019-09-23 Thread Dr. David Alan Gilbert
* Jintack Lim (incredible.t...@gmail.com) wrote: > Hi, Copying in Paolo, since he recently did work to fix nested migration - it was expected to be broken until pretty recently; but 4.1.0 qemu on 5.3 kernel is pretty new, so I think I'd expected it to work. > I'm seeing VM live migration failure

Migration failure when running nested VMs

2019-09-20 Thread Jintack Lim
Hi, I'm seeing VM live migration failure when a VM is running a nested VM. I'm using latest Linux kernel (v5.3) and QEMU (v4.1.0). I also tried v5.2, but the result was the same. Kernel versions in L1 and L2 VM are v4.18, but I don't think that matters. The symptom is that L2 VM kernel crashes in