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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no 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 328FDC83000 for ; Tue, 28 Apr 2020 23:10:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 18BF6206A1 for ; Tue, 28 Apr 2020 23:10:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726743AbgD1XK3 (ORCPT ); Tue, 28 Apr 2020 19:10:29 -0400 Received: from mga04.intel.com ([192.55.52.120]:60554 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726474AbgD1XK2 (ORCPT ); Tue, 28 Apr 2020 19:10:28 -0400 IronPort-SDR: yVkiZlyB4g6jhH4wMTZeigN/m3XZc6/paauO/BPMuK31V7c8UNtVBidrplolzfJH2gqyYl3+5h MeRYiWAUv9xQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Apr 2020 16:10:27 -0700 IronPort-SDR: 8mjifliADJUc5yUTmjVIPpF7tVD9vpYhGAqmSy/i42N505Ex7/pgBZXs+2ONDQFz+EowldtZ4y w+pyGs/7nYWA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,328,1583222400"; d="scan'208";a="257774902" Received: from sjchrist-coffee.jf.intel.com ([10.54.74.202]) by orsmga003.jf.intel.com with ESMTP; 28 Apr 2020 16:10:26 -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 Subject: [PATCH 0/2] KVM: nVMX: vmcs.SYSENTER optimization and "fix" Date: Tue, 28 Apr 2020 16:10:23 -0700 Message-Id: <20200428231025.12766-1-sean.j.christopherson@intel.com> X-Mailer: git-send-email 2.26.0 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 Patch 1 is a "fix" for handling SYSENTER_EIP/ESP in L2 on a 32-bit vCPU. The primary motivation is to provide consistent behavior after patch 2. Patch 2 is essentially a re-submission of a nested VMX optimization to avoid redundant VMREADs to the SYSENTER fields in the nested VM-Exit path. After patch 2 and without patch 1, KVM would end up with weird behavior where L1 and L2 would only see 32-bit values for their own SYSENTER_E*P MSRs, but L1 could see a 64-bit value for L2's MSRs. Sean Christopherson (2): KVM: nVMX: Truncate writes to vmcs.SYSENTER_EIP/ESP for 32-bit vCPU KVM: nVMX: Drop superfluous VMREAD of vmcs02.GUEST_SYSENTER_* arch/x86/kvm/vmx/nested.c | 4 ---- arch/x86/kvm/vmx/vmx.c | 18 ++++++++++++++++-- 2 files changed, 16 insertions(+), 6 deletions(-) -- 2.26.0