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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/