]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
perf/x86: Refuse to export capabilities for hybrid PMUs
authorSean Christopherson <seanjc@google.com>
Wed, 8 Feb 2023 20:42:30 +0000 (20:42 +0000)
committerPaolo Bonzini <pbonzini@redhat.com>
Wed, 15 Feb 2023 13:25:44 +0000 (08:25 -0500)
commit4b4191b8ae1278bde3642acaaef8f92810ed111a
treefd0aa814aee1e46ab851b7bf2a87d1f9a151f069
parent4d7404e5ee0066e9a9e8268675de8a273b568b08
perf/x86: Refuse to export capabilities for hybrid PMUs

Now that KVM disables vPMU support on hybrid CPUs, WARN and return zeros
if perf_get_x86_pmu_capability() is invoked on a hybrid CPU.  The helper
doesn't provide an accurate accounting of the PMU capabilities for hybrid
CPUs and needs to be enhanced if KVM, or anything else outside of perf,
wants to act on the PMU capabilities.

Cc: stable@vger.kernel.org
Cc: Andrew Cooper <Andrew.Cooper3@citrix.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Link: https://lore.kernel.org/all/20220818181530.2355034-1-kan.liang@linux.intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20230208204230.1360502-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/events/core.c