Provides userspace with per-VM capability(KVM_CAP_X86_DISABLE_EXITS) to not intercept MWAIT/HLT/PAUSE in order that to improve latency in some workloads. The patchset implements the original proposal from Radim. https://www.spinics.net/lists/kvm/msg146879.html In addition, thanks to Jan H. Schönherr's attempt last year. v1 -> v2: * remove blinding setting KVM_ENABLE_CAP statement in doc * move PV_UNHALT associated statement to 2/3 * rename kvm_mwait_can_in_guest to kvm_can_mwait_in_guest * remove unconditionally set INTERCEPT HLT in svm * call vmx_clear_hlt() from pre_enter_smm() * add a check to kvm_update_cpuid() that forbits KVM_FEATURE_PV_UNHALT when halt exits are disabld Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> Cc: Radim Krčmář <rkrcmar@xxxxxxxxxx> Cc: Jan H. Schönherr <jschoenh@xxxxxxxxx> Wanpeng Li (3): KVM: X86: Provides userspace with a capability to not intercept MWAIT KVM: X86: Provides userspace with a capability to not intercept HLT KVM: X86: Provides userspace with a capability to not intercept PAUSE Documentation/virtual/kvm/api.txt | 24 ++++++++++++------- arch/x86/include/asm/kvm_host.h | 4 ++++ arch/x86/kvm/cpuid.c | 5 ++++ arch/x86/kvm/svm.c | 9 ++++--- arch/x86/kvm/vmx.c | 50 ++++++++++++++++++++++++++++++++------- arch/x86/kvm/x86.c | 29 +++++++++++++++++++---- arch/x86/kvm/x86.h | 24 +++++++++++++++---- include/uapi/linux/kvm.h | 2 +- tools/include/uapi/linux/kvm.h | 2 +- 9 files changed, 118 insertions(+), 31 deletions(-) -- 2.7.4
