Public bug reported:
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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2036675
Title:
5.15.0-85 live migration regression
Status in linux package in Ubuntu:
New
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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