This series adds support for AMD's Host-Only and Guest-Only performance counter eventsel bits in KVM's mediated PMU passthrough implementation.
These bits allow an nSVM-enabled guest to configure performance counters that count only during L1 execution (Host-Only) or only during L2 execution (Guest-Only). KVM updates the hardware event selector ENABLE bit at the following state transitions to ensure counters only count in the appropriate mode: - EFER.SVME changes: Enable/disable Guest-Only counters - Nested VMRUN: Disable Host-Only, enable Guest-Only counters - Nested VMEXIT: Enable Host-Only, disable Guest-Only counters v1: https://lore.kernel.org/kvm/[email protected]/ v2: https://lore.kernel.org/kvm/[email protected]/ v2 -> v3: * Dropped the svm_enter_guest_mode() and svm_leave_guest_mode() wrappers introduced in v2 [Yosry] * Introduced a generic nested_transition callback in kvm_x86_ops to avoid confusing SVM-specific wrappers and unnecessary code replication * Fixed a latent bug with L2 stack alignment, which was triggered by a movdqa instruction in l2_guest_code() that referenced the L2 stack. Note that l2_guest_code() expects the stack to be 16-byte misaligned at function entry. It was not. Jim Mattson (5): KVM: x86/pmu: Introduce amd_pmu_set_eventsel_hw() KVM: x86/pmu: Disable Host-Only/Guest-Only events as appropriate for vCPU state KVM: x86/pmu: Refresh Host-Only/Guest-Only eventsel at nested transitions KVM: x86/pmu: Allow Host-Only/Guest-Only bits with nSVM and mediated PMU KVM: selftests: x86: Add svm_pmu_host_guest_test for Host-Only/Guest-Only bits arch/x86/include/asm/kvm-x86-ops.h | 1 + arch/x86/include/asm/kvm_host.h | 2 + arch/x86/include/asm/perf_event.h | 2 + arch/x86/kvm/kvm_cache_regs.h | 2 + arch/x86/kvm/svm/pmu.c | 42 +++- arch/x86/kvm/svm/svm.c | 3 + arch/x86/kvm/svm/svm.h | 5 + arch/x86/kvm/x86.c | 1 + tools/testing/selftests/kvm/Makefile.kvm | 1 + tools/testing/selftests/kvm/include/x86/pmu.h | 6 + .../selftests/kvm/include/x86/processor.h | 2 + .../kvm/x86/svm_pmu_host_guest_test.c | 199 ++++++++++++++++++ 12 files changed, 264 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/kvm/x86/svm_pmu_host_guest_test.c -- 2.53.0.rc2.204.g2597b5adb4-goog
