> Does this need to backport it to qemu in jammy for proper support ?

No
It isn't needed to work or even to support Saphire Rapids chips.

But is is useful if one wants to be able to specify Names to represent
cpu models instead of long lists of features. At the end of the day,
almost every SKU sold is slightly different even to the named models.
Once comes with a particular feature more or less.

And thereby it would indeed help to complete bug 2028057.
As in the past for other newer chip types we try to add them, but not as a high 
priority.
The challenge often is not the cpu model itself, but the features it refers to.

They also need to be added, which sometimes is trivial definition of a bit and 
sometimes is quite complex.
In case of the latter there is the chance that one might break more than the 
bit of comfort (as it mostly only eases specifying cpu models by names) it 
provides.

Therefore triaging as valid, but low priority unless someone explains a
more important use case that I might miss.

@Sergio - once time allows, please have a look which other patches we'd need.
Once we know that we can decide to add it fully to your and the teams queue, or 
to mark it Won't Fix.

P.S. The code already is in mantic and later

** Changed in: qemu (Ubuntu)
       Status: New => Triaged

** Changed in: qemu (Ubuntu)
   Importance: Undecided => Low

** Also affects: qemu (Ubuntu Mantic)
   Importance: Undecided
       Status: New

** Also affects: qemu (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Changed in: qemu (Ubuntu Jammy)
       Status: New => Triaged

** Changed in: qemu (Ubuntu Jammy)
   Importance: Undecided => Low

** Changed in: qemu (Ubuntu Mantic)
   Importance: Undecided => Low

** Changed in: qemu (Ubuntu Mantic)
       Status: New => Fix Released

** Changed in: qemu (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/2055410

Title:
  Qemu Support For Sapphire Rapids

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