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| author | Kyle Huey <me@kylehuey.com> | 2022-05-02 22:01:36 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-05-12 12:25:30 +0200 |
| commit | fbb7c61e76017202dedd2020f4d51264f500de68 (patch) | |
| tree | 45c1b9bfa619d1badb5ca18c58a4480f74c0d1e1 /fs | |
| parent | b085afe226075f87036ceb45e17e4448028f5c30 (diff) | |
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions