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

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Message-Id: <1466065297-4644-1-git-send-email-pbonzini@redhat.com>
Date:	Thu, 16 Jun 2016 10:21:35 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	bsd@...hat.com, rkrcmar@...hat.com
Subject: [RFC PATCH 0/2] KVM: x86: guest exit microoptimization

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(-)

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1.8.3.1