This bug is awaiting verification that the linux-mtk/5.15.0-1030.34
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-jammy-linux-mtk' to 'verification-done-jammy-
linux-mtk'. If the problem still exists, change the tag 'verification-
needed-jammy-linux-mtk' to 'verification-failed-jammy-linux-mtk'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-jammy-linux-mtk-v2 
verification-needed-jammy-linux-mtk

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https://bugs.launchpad.net/bugs/2036675

Title:
  5.15.0-85 live migration regression

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Jammy:
  Fix Released

Bug description:
  
  Fixes added for LP 2032164 [0] to resolve an issue in live migration have 
  unfortunately introduced a regression, causing a previously working live 
  migration pattern to fail when tested with the 5.15.0-85 kernel from 
-proposed.

  Specifically, live migration from a PKRU-enabled host running a kernel older
  than 5.15.0-85 to a host running the 5.15.0-85 kernel will fail.  The
  destination can be either with or without PKRU; both cases fail, although
  in different ways (one hangs, the other fails due to a PCID flag issue).

  The commits in question are

  commit fa9225d64f215e8109de10f6b6c7a08f033d0ec0
  Author: Dr. David Alan Gilbert <dgilb...@redhat.com>
  Date:   Mon Aug 21 14:47:28 2023 +0800

      KVM: x86: Always enable legacy FP/SSE in allowed user XFEATURES

  commit 27a189b881278c8ad9c16b0ee05668d724352733
  Author: Leonardo Bras <leob...@redhat.com>
  Date:   Mon Aug 21 14:47:27 2023 +0800

      x86/kvm/fpu: Limit guest user_xfeatures to supported bits of XCR0

  
  [0]   https://bugs.launchpad.net/bugs/2032164

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