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0b9ca98b72
Drop the return value from x86_perf_get_lbr() and have the stub zero out the @lbr structure instead of returning -1 to indicate "no LBR support". KVM doesn't actually check the return value, and instead subtly relies on zeroing the number of LBRs in intel_pmu_init(). Formalize "nr=0 means unsupported" so that KVM doesn't need to add a pointless check on the return value to fix KVM's benign bug. Note, the stub is necessary even though KVM x86 selects PERF_EVENTS and the caller exists only when CONFIG_KVM_INTEL=y. Despite the name, KVM_INTEL doesn't strictly require CPU_SUP_INTEL, it can be built with any of INTEL || CENTAUR || ZHAOXIN CPUs. Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20221006000314.73240-2-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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| .. | ||
| amd | ||
| intel | ||
| zhaoxin | ||
| core.c | ||
| Kconfig | ||
| Makefile | ||
| msr.c | ||
| perf_event_flags.h | ||
| perf_event.h | ||
| probe.c | ||
| probe.h | ||
| rapl.c | ||
| utils.c | ||