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Re: [Qemu-devel] [libvirt] QEMU -M nvdimm=on and hotplug
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From: |
Haozhong Zhang |
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Subject: |
Re: [Qemu-devel] [libvirt] QEMU -M nvdimm=on and hotplug |
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Date: |
Thu, 14 Sep 2017 08:33:41 +0800 |
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User-agent: |
NeoMutt/20170714 (1.8.3) |
On 09/13/17 17:28 +0200, Michal Privoznik wrote:
>
> BTW: I ran a migration from no nvdimm qemu to one that had -M nvdimm=on
> and guest migrated happily. So looks like guest ABI is stable (or at
> least stable enough not to crash). But since ACPI table is changed I
> doubt that.
One example that may cause trouble is that
1/ Guest OS got a pointer to an ACPI table A on the source host (w/o nvdimm=on)
2/ After migrating to the destination host (w/ nvdimm=on), the
location of ACPI table A is occupied by NFIT. If guest OS tries to
access ACPI table A via the pointer in step 1/, then it will access
the wrong table.
>
> Also, I found that hotunplug is not implemented yet?
So far there is no public specification defining NVDIMM hotunplug, so
we didn't implement it.
Haozhong
>
> error: internal error: unable to execute QEMU command 'device_del':
> nvdimm device hot unplug is not supported yet.
>
> Michal