[Bug 209155] KVM Linux guest with more than 1 CPU panics after commit 5a9f54435a48... on old CPU (Phenom x4)

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https://bugzilla.kernel.org/show_bug.cgi?id=209155

--- Comment #3 from Paul K. (kronenpj@xxxxxxxxxxxxxxxxxxx) ---
$ git bisect log
# bad: [bcf876870b95592b52519ed4aafcf9d95999bc9c] Linux 5.8
git bisect start 'v5.8'
# good: [3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162] Linux 5.7
git bisect good 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162
# bad: [694b5a5d313f3997764b67d52bab66ec7e59e714] Merge tag 'arm-soc-5.8' of
git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect bad 694b5a5d313f3997764b67d52bab66ec7e59e714
# bad: [694b5a5d313f3997764b67d52bab66ec7e59e714] Merge tag 'arm-soc-5.8' of
git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect bad 694b5a5d313f3997764b67d52bab66ec7e59e714
# bad: [694b5a5d313f3997764b67d52bab66ec7e59e714] Merge tag 'arm-soc-5.8' of
git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect bad 694b5a5d313f3997764b67d52bab66ec7e59e714
# bad: [694b5a5d313f3997764b67d52bab66ec7e59e714] Merge tag 'arm-soc-5.8' of
git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect bad 694b5a5d313f3997764b67d52bab66ec7e59e714
# bad: [694b5a5d313f3997764b67d52bab66ec7e59e714] Merge tag 'arm-soc-5.8' of
git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect bad 694b5a5d313f3997764b67d52bab66ec7e59e714
# bad: [2e63f6ce7ed2c4ff83ba30ad9ccad422289a6c63] Merge branch 'uaccess.comedi'
of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
git bisect bad 2e63f6ce7ed2c4ff83ba30ad9ccad422289a6c63
# good: [cfa3b8068b09f25037146bfd5eed041b78878bee] Merge tag 'for-linus-hmm' of
git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
git bisect good cfa3b8068b09f25037146bfd5eed041b78878bee
# good: [c41219fda6e04255c44d37fd2c0d898c1c46abf1] Merge tag
'drm-intel-next-fixes-2020-05-20' of
git://anongit.freedesktop.org/drm/drm-intel into drm-next
git bisect good c41219fda6e04255c44d37fd2c0d898c1c46abf1
# good: [f3cdc8ae116e27d84e1f33c7a2995960cebb73ac] Merge tag 'for-5.8-tag' of
git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
git bisect good f3cdc8ae116e27d84e1f33c7a2995960cebb73ac
# good: [f1e455352b6f503532eb3637d0a6d991895e7856] Merge tag 'kgdb-5.8-rc1' of
git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux
git bisect good f1e455352b6f503532eb3637d0a6d991895e7856
# bad: [cb953129bfe5c0f2da835a0469930873fb7e71df] kvm: add halt-polling cpu
usage stats
git bisect bad cb953129bfe5c0f2da835a0469930873fb7e71df
# good: [3754afe7cf7cc3693a9c9ff795e9bd97175ca639] tools/kvm_stat: Add command
line switch '-L' to log to file
git bisect good 3754afe7cf7cc3693a9c9ff795e9bd97175ca639
# good: [c4e115f08c08cb9f3b70247b42323e40b9afd1fd] kvm/eventfd: remove unneeded
conversion to bool
git bisect good c4e115f08c08cb9f3b70247b42323e40b9afd1fd
# good: [5b494aea13fe9ec67365510c0d75835428cbb303] KVM: No need to retry for
hva_to_pfn_remapped()
git bisect good 5b494aea13fe9ec67365510c0d75835428cbb303
# bad: [379a3c8ee44440d5afa505230ed8cb5b0d0e314b] KVM: VMX: Optimize
posted-interrupt delivery for timer fastpath
git bisect bad 379a3c8ee44440d5afa505230ed8cb5b0d0e314b
# good: [9e826feb8f114964cbdce026340b6cb9bde68a18] KVM: nVMX: Drop superfluous
VMREAD of vmcs02.GUEST_SYSENTER_*
git bisect good 9e826feb8f114964cbdce026340b6cb9bde68a18
# good: [2c4c41325540cf3abb12aef142c0e550f6afeffc] KVM: x86: Print symbolic
names of VMX VM-Exit flags in traces
git bisect good 2c4c41325540cf3abb12aef142c0e550f6afeffc
# bad: [404d5d7bff0d419fe11c7eaebca9ec8f25258f95] KVM: X86: Introduce more
exit_fastpath_completion enum values
git bisect bad 404d5d7bff0d419fe11c7eaebca9ec8f25258f95
# good: [5a9f54435a488f8a1153efd36cccee3e7e0fc28b] KVM: X86: Introduce
kvm_vcpu_exit_request() helper
git bisect good 5a9f54435a488f8a1153efd36cccee3e7e0fc28b
# first bad commit: [404d5d7bff0d419fe11c7eaebca9ec8f25258f95] KVM: X86:
Introduce more exit_fastpath_completion enum values

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