From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DA4D8C4332D for ; Fri, 20 Mar 2020 21:28:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF22420724 for ; Fri, 20 Mar 2020 21:28:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727241AbgCTV2u (ORCPT ); Fri, 20 Mar 2020 17:28:50 -0400 Received: from mga04.intel.com ([192.55.52.120]:59216 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727192AbgCTV2s (ORCPT ); Fri, 20 Mar 2020 17:28:48 -0400 IronPort-SDR: vAK15cgCXY7e1hHUzluzawN6bMMS/A3oDHaw0FnhQ8ZFtQtRHu4m+vRN+JthSI2R84EpqOXBpP YG9bIX0vkpcA== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Mar 2020 14:28:46 -0700 IronPort-SDR: OUbuLB80Aoo5u0WS81hdPdTcDyar7PORxjpiI2hF5Bdne4MWqYiu0wn5pGSm5JUyL7YSrj5ZQh qR9KexWWTobw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.72,286,1580803200"; d="scan'208";a="269224421" Received: from sjchrist-coffee.jf.intel.com ([10.54.74.202]) by fmsmga004.fm.intel.com with ESMTP; 20 Mar 2020 14:28:46 -0700 From: Sean Christopherson To: Paolo Bonzini Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Ben Gardon , Junaid Shahid , Liran Alon , Boris Ostrovsky , John Haxby , Miaohe Lin , Tom Lendacky Subject: [PATCH v3 08/37] KVM: VMX: Skip global INVVPID fallback if vpid==0 in vpid_sync_context() Date: Fri, 20 Mar 2020 14:28:04 -0700 Message-Id: <20200320212833.3507-9-sean.j.christopherson@intel.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200320212833.3507-1-sean.j.christopherson@intel.com> References: <20200320212833.3507-1-sean.j.christopherson@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Skip the global INVVPID in the unlikely scenario that vpid==0 and the SINGLE_CONTEXT variant of INVVPID is unsupported. If vpid==0, there's no need to INVVPID as it's impossible to do VM-Enter with VPID enabled and vmcs.VPID==0, i.e. there can't be any TLB entries for the vCPU with vpid==0. The fact that the SINGLE_CONTEXT variant isn't supported is irrelevant. Signed-off-by: Sean Christopherson --- arch/x86/kvm/vmx/ops.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/ops.h b/arch/x86/kvm/vmx/ops.h index 45eaedee2ac0..33645a8e5463 100644 --- a/arch/x86/kvm/vmx/ops.h +++ b/arch/x86/kvm/vmx/ops.h @@ -285,7 +285,7 @@ static inline void vpid_sync_context(int vpid) { if (cpu_has_vmx_invvpid_single()) vpid_sync_vcpu_single(vpid); - else + else if (vpid != 0) vpid_sync_vcpu_global(); } -- 2.24.1