This series adds PLE(pause loop exit) logic from VMX to SVM. We have noticed considerable reduction in number of VMEXITS due to pause interceptions after these changes. Here are the numbers on one guest with 32 vcpus on AMD EPYC system. We have used boot parameter idle=poll to simulate extensive pauses on the guest. Here are VMEXITS in 10 seconds interval. #VMEXITS(in 10s) Before the change After the change Pauses 810199 504 Total 882184 325415 v2: Handled most of the Radim's comments. Here are the changes. 1. Fixed the module parameters to unsigned variants 1. Kept the default pause_filter_count = 3000 for AMD. 2. Removed the ple_window_actual_max parameter. Added a check in __grow_ple_window to avoid overflow. 3. Fixed the naming conventions for SVM module parameters. They are now called as pause_filter_count, pause_filter_thresh, pause_filter_shrink and pause_filter_grow. 4. Taken care of intercept setting and clearing. 5. Fixed few more text changes. v1: Initial RFC version Babu Moger (5): KVM: VMX: Fix the module parameters for vmx KVM: VMX: Remove ple_window_actual_max KVM: VMX: Bring the common code to header file KVM: SVM: Add pause filter threshold KVM: SVM: Implement pause loop exit logic in SVM arch/x86/include/asm/svm.h | 3 +- arch/x86/kvm/svm.c | 108 ++++++++++++++++++++++++++++++++++++++++++++- arch/x86/kvm/vmx.c | 82 +++++++--------------------------- arch/x86/kvm/x86.h | 37 ++++++++++++++++ 4 files changed, 161 insertions(+), 69 deletions(-) -- 1.8.3.1
