Disable vPMU support in KVM when running on hybrid CPUs to avoid inducing #GPs and other issues in guests. This is intended to be a stopgap to prevent unwitting KVM users from shooting themselves in the foot until KVM KVM gets proper enabling for hybrid CPUs. Effectively squash exporting PMU capabilities from perf until it too gets proper enabling. v2: - Disable vPMU on hybrid CPUs in KVM _and_ in perf. [Like] - Use X86_FEATURE_HYBRID_CPU instead of is_hybrid(). - Tweak comments/changelogs to more clearly state that there are options beyond pinning vCPUs (though they still need KVM support). [Like] v1: https://lore.kernel.org/all/20230120004051.2043777-1-seanjc@xxxxxxxxxx Sean Christopherson (2): KVM: x86/pmu: Disable vPMU support on hybrid CPUs (host PMUs) perf/x86: Refuse to export capabilities for hybrid PMUs arch/x86/events/core.c | 14 ++++++++------ arch/x86/kvm/pmu.h | 26 +++++++++++++++++++------- 2 files changed, 27 insertions(+), 13 deletions(-) base-commit: 7cb79f433e75b05d1635aefaa851cfcd1cb7dc4f -- 2.39.1.519.gcb327c4b5f-goog
