[RFC PATCH 0/2] KVM: x86: guest exit microoptimization

From	Paolo Bonzini <pbonzini@redhat.com>
Newsgroups	linux.kernel
Subject	[RFC PATCH 0/2] KVM: x86: guest exit microoptimization
Date	2016-06-16 10:30 +0200
Message-ID	<rKAQx-5Ue-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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This saves about 20 clock cycles per vmexit by avoiding a
local_irq_save/restore pair.  The price is that nested VMX will break
with KVM hosts < 3.16, because the "acknowledge interrupt on exit"
feature becomes mandatory.  What do you think?

Paolo

Paolo Bonzini (2):
  KVM: x86: always use "acknowledge interrupt on exit"
  KVM: x86: use __kvm_guest_exit

 arch/x86/kvm/svm.c |  6 ++++++
 arch/x86/kvm/vmx.c | 11 ++++-------
 arch/x86/kvm/x86.c | 11 ++---------
 3 files changed, 12 insertions(+), 16 deletions(-)

-- 
1.8.3.1

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[RFC PATCH 0/2] KVM: x86: guest exit microoptimization Paolo Bonzini <pbonzini@redhat.com> - 2016-06-16 10:30 +0200
  [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit Paolo Bonzini <pbonzini@redhat.com> - 2016-06-16 10:30 +0200
    Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit David Matlack <dmatlack@google.com> - 2016-06-16 18:50 +0200
      Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit Paolo Bonzini <pbonzini@redhat.com> - 2016-06-16 18:50 +0200
        Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit David Matlack <dmatlack@google.com> - 2016-06-16 19:10 +0200
          Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit Paolo Bonzini <pbonzini@redhat.com> - 2016-06-16 19:30 +0200
    Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit Bandan Das <bsd@redhat.com> - 2016-06-17 00:10 +0200
      Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit Paolo Bonzini <pbonzini@redhat.com> - 2016-06-17 07:30 +0200

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