From patchwork Sun May 6 14:20:50 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Graf X-Patchwork-Id: 157079 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id EA0ABB6FC2 for ; Mon, 7 May 2012 00:21:49 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753099Ab2EFOVD (ORCPT ); Sun, 6 May 2012 10:21:03 -0400 Received: from cantor2.suse.de ([195.135.220.15]:51732 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752351Ab2EFOVB (ORCPT ); Sun, 6 May 2012 10:21:01 -0400 Received: from relay1.suse.de (unknown [195.135.220.254]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx2.suse.de (Postfix) with ESMTP id 2C3FEA3DE1; Sun, 6 May 2012 16:21:01 +0200 (CEST) From: Alexander Graf To: kvm-ppc Cc: kvm list , Avi Kivity Subject: [PATCH 06/16] KVM: PPC: Book3S: PR: Optimize entry path Date: Sun, 6 May 2012 16:20:50 +0200 Message-Id: <1336314060-32640-7-git-send-email-agraf@suse.de> X-Mailer: git-send-email 1.6.0.2 In-Reply-To: <1336314060-32640-1-git-send-email-agraf@suse.de> References: <1336314060-32640-1-git-send-email-agraf@suse.de> Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org By shuffling a few instructions around we can execute more memory loads in parallel, giving us a small performance boost. With this patch and a simple priviledged SPR access loop guest, I get a speed bump from 2013052 to 2035607 exits per second. Signed-off-by: Alexander Graf --- arch/powerpc/kvm/book3s_segment.S | 13 +++++++------ 1 files changed, 7 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/kvm/book3s_segment.S b/arch/powerpc/kvm/book3s_segment.S index 0676ae2..6bae0a9 100644 --- a/arch/powerpc/kvm/book3s_segment.S +++ b/arch/powerpc/kvm/book3s_segment.S @@ -128,24 +128,25 @@ no_dcbz32_on: /* First clear RI in our current MSR value */ li r0, MSR_RI andc r6, r6, r0 - MTMSR_EERI(r6) - mtsrr0 r9 - mtsrr1 r4 PPC_LL r0, SVCPU_R0(r3) PPC_LL r1, SVCPU_R1(r3) PPC_LL r2, SVCPU_R2(r3) - PPC_LL r4, SVCPU_R4(r3) PPC_LL r5, SVCPU_R5(r3) - PPC_LL r6, SVCPU_R6(r3) PPC_LL r7, SVCPU_R7(r3) PPC_LL r8, SVCPU_R8(r3) - PPC_LL r9, SVCPU_R9(r3) PPC_LL r10, SVCPU_R10(r3) PPC_LL r11, SVCPU_R11(r3) PPC_LL r12, SVCPU_R12(r3) PPC_LL r13, SVCPU_R13(r3) + MTMSR_EERI(r6) + mtsrr0 r9 + mtsrr1 r4 + + PPC_LL r4, SVCPU_R4(r3) + PPC_LL r6, SVCPU_R6(r3) + PPC_LL r9, SVCPU_R9(r3) PPC_LL r3, (SVCPU_R3)(r3) RFI