linux-kernel - [RFC PATCH 0/5] KVM: speed up invalid guest state emulation

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Message-Id: <1395919838-18466-1-git-send-email-pbonzini@redhat.com>
Date:	Thu, 27 Mar 2014 12:30:33 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	kvm@...r.kernel.org
Subject: [RFC PATCH 0/5] KVM: speed up invalid guest state emulation

This series identifies some low-hanging fruit for speeding up emulation
of invalid guest state.  I am a bit worried about patch 2, while
everything else should be relatively safe.

On the kvm-unit-tests microbenchmarks I get a 1.8-2.5x speedup (from 
740-1100 cycles/instruction to 280-600).

This is not for 3.15, of course.  Even patch 5 is not too useful without
the others; saving 40 clock cycles is a 10% speedup after the previous
patches, but only 4% before.

Please review carefully!

Paolo

Paolo Bonzini (5):
  KVM: vmx: speed up emulation of invalid guest state
  KVM: x86: avoid useless set of KVM_REQ_EVENT after emulation
  KVM: x86: move around some checks
  KVM: x86: protect checks on ctxt->d by a common "if (unlikely())"
  KVM: x86: speed up emulated moves

 arch/x86/include/asm/kvm_emulate.h |   2 +-
 arch/x86/kvm/emulate.c             | 182 ++++++++++++++++++++-----------------
 arch/x86/kvm/vmx.c                 |   5 +-
 arch/x86/kvm/x86.c                 |  28 ++++--
 4 files changed, 120 insertions(+), 97 deletions(-)

-- 
1.8.3.1

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