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| author | Kyle Huey <me@kylehuey.com> | 2022-05-03 08:01:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-05-15 20:54:47 +0300 |
| commit | f52c4c067aa53f53bfb244a7dfa9c3d90082b7a3 (patch) | |
| tree | 250c7997dc35f99f29ecac3dc341f49b686cffbf /MAINTAINERS | |
| parent | c1bdf1e6e706f15d5627be9d8b582a8edd9acc1e (diff) | |
| download | linux-f52c4c067aa53f53bfb244a7dfa9c3d90082b7a3.tar.xz | |
KVM: x86/svm: Account for family 17h event renumberings in amd_pmc_perf_hw_id
commit 5eb849322d7f7ae9d5c587c7bc3b4f7c6872cd2f upstream.
Zen renumbered some of the performance counters that correspond to the
well known events in perf_hw_id. This code in KVM was never updated for
that, so guest that attempt to use counters on Zen that correspond to the
pre-Zen perf_hw_id values will silently receive the wrong values.
This has been observed in the wild with rr[0] when running in Zen 3
guests. rr uses the retired conditional branch counter 00d1 which is
incorrectly recognized by KVM as PERF_COUNT_HW_STALLED_CYCLES_BACKEND.
[0] https://rr-project.org/
Signed-off-by: Kyle Huey <me@kylehuey.com>
Message-Id: <20220503050136.86298-1-khuey@kylehuey.com>
Cc: stable@vger.kernel.org
[Check guest family, not host. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[Backport to 5.15: adjusted context]
Signed-off-by: Kyle Huey <me@kylehuey.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'MAINTAINERS')
0 files changed, 0 insertions, 0 deletions