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=-21.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 E301AC433B4 for ; Thu, 15 Apr 2021 13:44:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B885961008 for ; Thu, 15 Apr 2021 13:44:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233469AbhDONoY (ORCPT ); Thu, 15 Apr 2021 09:44:24 -0400 Received: from linux.microsoft.com ([13.77.154.182]:41504 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233357AbhDONoS (ORCPT ); Thu, 15 Apr 2021 09:44:18 -0400 Received: from viremana-dev.fwjladdvyuiujdukmejncen4mf.xx.internal.cloudapp.net (unknown [13.66.132.26]) by linux.microsoft.com (Postfix) with ESMTPSA id EB6D020B8001; Thu, 15 Apr 2021 06:43:54 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com EB6D020B8001 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1618494235; bh=f+72EpphKYDyWb2ni9IPH1kTpGV8sLOlwjys3mFfBxI=; h=From:To:Cc:Subject:Date:From; b=KkjRctg//cx736rviMBMko/DerhF/2bHx3YRxjgwH+KTq9v0c0jITUtNAKkvMbaHH I3Pp9qTlwLvjsXR53qZUFJlG4MIwku4JjZHaWDeXSYEM5e4Fsm59nhDU+XgK0/rflv eoFIjulbg0eh/ZZF/b+m7IuXBehE31DefmdLu4xA= From: Vineeth Pillai To: Lan Tianyu , Michael Kelley , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Wei Liu , Stephen Hemminger , Haiyang Zhang Cc: Vineeth Pillai , "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "K. Y. Srinivasan" , x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org Subject: [PATCH v2 0/7] Hyper-V nested virt enlightenments for SVM Date: Thu, 15 Apr 2021 13:43:35 +0000 Message-Id: X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch series enables the nested virtualization enlightenments for SVM. This is very similar to the enlightenments for VMX except for the fact that there is no enlightened VMCS. For SVM, VMCB is already an architectural in-memory data structure. The supported enlightenments are: Enlightened TLB Flush: If this is enabled, ASID invalidations invalidate only gva -> hpa entries. To flush entries derived from NPT, hyper-v provided hypercalls (HvFlushGuestPhysicalAddressSpace or HvFlushGuestPhysicalAddressList) should be used. Enlightened MSR bitmap(TLFS 16.5.3): "When enabled, L0 hypervisor does not monitor the MSR bitmaps for changes. Instead, the L1 hypervisor must invalidate the corresponding clean field after making changes to one of the MSR bitmaps." Direct Virtual Flush(TLFS 16.8): The hypervisor exposes hypercalls (HvFlushVirtualAddressSpace, HvFlushVirtualAddressSpaceEx, HvFlushVirtualAddressList, and HvFlushVirtualAddressListEx) that allow operating systems to more efficiently manage the virtual TLB. The L1 hypervisor can choose to allow its guest to use those hypercalls and delegate the responsibility to handle them to the L0 hypervisor. This requires the use of a partition assist page." L2 Windows boot time was measured with and without the patch. Time was measured from power on to the login screen and was averaged over a consecutive 5 trials: Without the patch: 42 seconds With the patch: 29 seconds -- Changes from v1: - Move the remote TLB flush related fields from kvm_vcpu_hv and kvm_hv to kvm_vcpu_arch and kvm_arch. - Modify the VMCB clean mask runtime based on whether L1 hypervisor is running on Hyper-V or not. - Detect Hyper-V nested enlightenments based on HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS. - Address other minor review comments. --- Vineeth Pillai (7): hyperv: Detect Nested virtualization support for SVM hyperv: SVM enlightened TLB flush support flag KVM: x86: hyper-v: Move the remote TLB flush logic out of vmx KVM: SVM: hyper-v: Nested enlightenments in VMCB KVM: SVM: hyper-v: Remote TLB flush for SVM KVM: SVM: hyper-v: Enlightened MSR-Bitmap support KVM: SVM: hyper-v: Direct Virtual Flush support arch/x86/include/asm/hyperv-tlfs.h | 9 +++ arch/x86/include/asm/kvm_host.h | 14 ++++ arch/x86/include/asm/svm.h | 24 +++++- arch/x86/kernel/cpu/mshyperv.c | 10 ++- arch/x86/kvm/hyperv.c | 87 +++++++++++++++++++++ arch/x86/kvm/hyperv.h | 20 +++++ arch/x86/kvm/svm/svm.c | 120 +++++++++++++++++++++++++++++ arch/x86/kvm/svm/svm.h | 30 +++++++- arch/x86/kvm/vmx/vmx.c | 97 ++--------------------- arch/x86/kvm/vmx/vmx.h | 10 --- arch/x86/kvm/x86.c | 9 ++- 11 files changed, 323 insertions(+), 107 deletions(-) -- 2.25.1