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Re: [Qemu-devel] NVDIMM live migration broken?
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] NVDIMM live migration broken? |
Date: |
Fri, 23 Jun 2017 10:55:22 +0100 |
User-agent: |
Mutt/1.8.0 (2017-02-23) |
On Fri, Jun 23, 2017 at 08:13:13AM +0800, address@hidden wrote:
> On 06/22/17 15:08 +0100, Stefan Hajnoczi wrote:
> > I tried live migrating a guest with NVDIMM on qemu.git/master (edf8bc984):
> >
> > $ qemu -M accel=kvm,nvdimm=on -m 1G,slots=4,maxmem=8G -cpu host \
> > -object
> > memory-backend-file,id=mem1,share=on,mem-path=nvdimm.dat,size=1G \
> > -device nvdimm,id=nvdimm1,memdev=mem1 \
> > -drive if=virtio,file=test.img,format=raw
> >
> > $ qemu -M accel=kvm,nvdimm=on -m 1G,slots=4,maxmem=8G -cpu host \
> > -object
> > memory-backend-file,id=mem1,share=on,mem-path=nvdimm.dat,size=1G \
> > -device nvdimm,id=nvdimm1,memdev=mem1 \
> > -drive if=virtio,file=test.img,format=raw \
> > -incoming tcp::1234
> >
> > (qemu) migrate tcp:127.0.0.1:1234
> >
> > The guest kernel panics or hangs every time on the destination. It
> > happens as long as the nvdimm device is present - I didn't even mount it
> > inside the guest.
> >
> > Is migration expected to work?
>
> Yes, I tested on QEMU 2.8.0 several months ago and it worked. I'll
> have a look at this issue.
Great, thanks!
David Gilbert suggested the following on IRC, it sounds like a good
starting point for debugging:
Launch the destination QEMU with -S (vcpus will be paused) and after
migration has completed, compare the NVDIMM contents on source and
destination.
Stefan
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- [Qemu-devel] NVDIMM live migration broken?, Stefan Hajnoczi, 2017/06/22
- Re: [Qemu-devel] NVDIMM live migration broken?, haozhong.zhang, 2017/06/22
- Re: [Qemu-devel] NVDIMM live migration broken?,
Stefan Hajnoczi <=
- Re: [Qemu-devel] NVDIMM live migration broken?, Haozhong Zhang, 2017/06/25
- Re: [Qemu-devel] NVDIMM live migration broken?, Stefan Hajnoczi, 2017/06/26
- Re: [Qemu-devel] NVDIMM live migration broken?, Haozhong Zhang, 2017/06/27
- Re: [Qemu-devel] NVDIMM live migration broken?, Juan Quintela, 2017/06/27
- Re: [Qemu-devel] NVDIMM live migration broken?, Juan Quintela, 2017/06/27
- Re: [Qemu-devel] NVDIMM live migration broken?, Stefan Hajnoczi, 2017/06/28