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| author | Sean Christopherson <seanjc@google.com> | 2023-11-10 05:28:57 +0300 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2024-02-01 20:35:48 +0300 |
| commit | 83bdfe04c968e0fe3181e4cd41b764e17ac73911 (patch) | |
| tree | 1ed26527de1b6e3f979289519879d7299e9c4c3f /lib/test-string_helpers.c | |
| parent | e35529fb4ac930a4a39e0c15bafcb28a30d26611 (diff) | |
| download | linux-83bdfe04c968e0fe3181e4cd41b764e17ac73911.tar.xz | |
KVM: x86/pmu: Avoid CPL lookup if PMC enabline for USER and KERNEL is the same
Don't bother querying the CPL if a PMC is (not) counting for both USER and
KERNEL, i.e. if the end result is guaranteed to be the same regardless of
the CPL. Querying the CPL on Intel requires a VMREAD, i.e. isn't free,
and a single CMP+Jcc is cheap.
Link: https://lore.kernel.org/r/20231110022857.1273836-11-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'lib/test-string_helpers.c')
0 files changed, 0 insertions, 0 deletions