[PATCH] vmx: Parse vm.genid

Michal Prívozník mprivozn at redhat.com
Mon Aug 2 11:00:15 UTC 2021

On 7/30/21 2:02 PM, Richard W.M. Jones wrote:
> On Thu, Jul 29, 2021 at 10:30:30AM +0200, Michal Privoznik wrote:
>> The VMware metadata file contains genid but we are not parsing
>> and thus reporting it in domain XML. However, it's not as
>> straightforward as one might think. The UUID reported by VMware
>> is not in its usual string form, but split into two signed long
>> longs. That means, we have to do a bit of trickery when parsing.
>> But looking around it's the same magic that libguestfs does:
>> https://github.com/libguestfs/virt-v2v/blob/master/v2v/input_vmx.ml#L421
>> It's also explained by Rich on qemu-devel:
>> https://lists.nongnu.org/archive/html/qemu-devel/2018-07/msg02019.html
>> Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1598348
>> Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
>> ---
>> I've successfully ran vmx2xmltest on an s390x machine which means that
>> there shouldn't be any endiandness problem.
>>  src/vmx/vmx.c                                 | 30 +++++++++++++++++++
>>  .../vmx2xml-esx-in-the-wild-10.xml            |  1 +
>>  2 files changed, 31 insertions(+)

> Looked reasonable and seems to match the description here:
> https://lists.nongnu.org/archive/html/qemu-devel/2018-07/msg02019.html
> Reviewed-by: Richard W.M. Jones <rjones at redhat.com>

Pushed, thanks.

> Out of interest, what is this being consumed by?  I will add this to
> virt-v2v when it goes upstream.

I don't recall all the specifics (it was John who implemented it), but
IIRC it was needed for Windows guests. Something about identifying them
uniquely. John?

Here's the commit that implemented it in libvirt:



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