Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755880AbbB1ANs (ORCPT ); Fri, 27 Feb 2015 19:13:48 -0500 Received: from mail-by2on0103.outbound.protection.outlook.com ([207.46.100.103]:4595 "EHLO na01-by2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751053AbbB1ANq (ORCPT ); Fri, 27 Feb 2015 19:13:46 -0500 X-Greylist: delayed 952 seconds by postgrey-1.27 at vger.kernel.org; Fri, 27 Feb 2015 19:13:46 EST X-WSS-ID: 0NKGFWD-07-3UH-02 X-M-MSG: Subject: [PATCH] x86: svm: use kvm_fast_pio_in() From: Joel Schopp To: Gleb Natapov , Paolo Bonzini , CC: David Kaplan , David Kaplan , , Joerg Roedel , Marcelo Tosatti , , <--bcc=ssg.sos.patches@amd.com>, Borislav Petkov Date: Fri, 27 Feb 2015 18:01:34 -0600 Message-ID: <20150228000134.11870.31357.stgit@joelvmguard2.amd.com> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.180.168.240] X-EOPAttributedMessage: 0 Authentication-Results: spf=none (sender IP is 165.204.84.221) smtp.mailfrom=Joel.Schopp@amd.com; 8bytes.org; dkim=none (message not signed) header.d=none; X-Forefront-Antispam-Report: CIP:165.204.84.221;CTRY:US;IPV:NLI;EFV:NLI;SFV:NSPM;SFS:(10019020)(6009001)(428002)(189002)(199003)(23676002)(77096005)(101416001)(77156002)(92566002)(50466002)(103116003)(47776003)(33646002)(19580395003)(62966003)(19580405001)(53416004)(229853001)(106466001)(50986999)(105586002)(54356999)(87936001)(46102003)(83506001)(86362001)(575784001);DIR:OUT;SFP:1102;SCL:1;SRVR:BL2PR02MB465;H:atltwp01.amd.com;FPR:;SPF:None;MLV:sfv;MX:1;A:1;LANG:en; X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:BL2PR02MB465; X-Microsoft-Antispam-PRVS: X-Exchange-Antispam-Report-Test: UriScan:; X-Exchange-Antispam-Report-CFA-Test: BCL:0;PCL:0;RULEID:(601004)(5005006);SRVR:BL2PR02MB465;BCL:0;PCL:0;RULEID:;SRVR:BL2PR02MB465; X-Forefront-PRVS: 05009853EF X-OriginatorOrg: amd4.onmicrosoft.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Feb 2015 23:57:50.3002 (UTC) X-MS-Exchange-CrossTenant-Id: fde4dada-be84-483f-92cc-e026cbee8e96 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=fde4dada-be84-483f-92cc-e026cbee8e96;Ip=[165.204.84.221] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL2PR02MB465 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1335 Lines: 40 From: David Kaplan We can make the in instruction go faster the same way the out instruction is already. Signed-off-by: David Kaplan [extracted from larger unlrelated patch, forward ported, tested] Signed-off-by: Joel Schopp --- arch/x86/kvm/svm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index d319e0c..f8c906b 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1899,7 +1899,7 @@ static int io_interception(struct vcpu_svm *svm) ++svm->vcpu.stat.io_exits; string = (io_info & SVM_IOIO_STR_MASK) != 0; in = (io_info & SVM_IOIO_TYPE_MASK) != 0; - if (string || in) + if (string) return emulate_instruction(vcpu, 0) == EMULATE_DONE; port = io_info >> 16; @@ -1907,6 +1907,8 @@ static int io_interception(struct vcpu_svm *svm) svm->next_rip = svm->vmcb->control.exit_info_2; skip_emulated_instruction(&svm->vcpu); + if (in) + return kvm_fast_pio_in(vcpu, size, port); return kvm_fast_pio_out(vcpu, size, port); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/