linux-kernel - [RFC PATCH 0/3] Emulator Speedups

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Message-Id: <1399336859-7227-1-git-send-email-bsd@redhat.com>
Date:	Mon,  5 May 2014 20:40:56 -0400
From:	Bandan Das <bsd@...hat.com>
To:	kvm@...r.kernel.org
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...nel.org>, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/3] Emulator Speedups - Optimize Instruction fetches

My initial attempt at caching gva->gpa->hva translations. Pretty straight
forward with details in the individual patches.

I haven't yet looked into if there are other possibilities
to speed things up, just thought of sending these out since 
the numbers are better

567 cycles/emulated jump instruction
718 cycles/emulated move instruction
730 cycles/emulated arithmetic instruction
946 cycles/emulated memory load instruction
956 cycles/emulated memory store instruction
921 cycles/emulated memory RMW instruction

Old realmode.flat numbers from init ctxt changes -
https://lkml.org/lkml/2014/4/16/848

639 cycles/emulated jump instruction (4.3%)
776 cycles/emulated move instruction (7.5%)
791 cycles/emulated arithmetic instruction (11%)
943 cycles/emulated memory load instruction (5.2%)
948 cycles/emulated memory store instruction (7.6%)
929 cycles/emulated memory RMW instruction (9.0%)

Bandan Das (3):
  KVM: x86: pass ctxt to fetch helper function
  KVM: x86: use memory_prepare in fetch helper function
  KVM: x86: cache userspace address for faster fetches

 arch/x86/include/asm/kvm_emulate.h |  7 +++++-
 arch/x86/kvm/x86.c                 | 46 ++++++++++++++++++++++++++++----------
 2 files changed, 40 insertions(+), 13 deletions(-)

-- 
1.8.3.1

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