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=-26.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, 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 35844C433B4 for ; Thu, 15 Apr 2021 13:44:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1BD73611AD for ; Thu, 15 Apr 2021 13:44:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233512AbhDONos (ORCPT ); Thu, 15 Apr 2021 09:44:48 -0400 Received: from linux.microsoft.com ([13.77.154.182]:41628 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233408AbhDONoW (ORCPT ); Thu, 15 Apr 2021 09:44:22 -0400 Received: from viremana-dev.fwjladdvyuiujdukmejncen4mf.xx.internal.cloudapp.net (unknown [13.66.132.26]) by linux.microsoft.com (Postfix) with ESMTPSA id 4613120B83ED; Thu, 15 Apr 2021 06:43:58 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 4613120B83ED DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1618494238; bh=RNc5oMHcI9bvJUCcO35E0Da1XRWsyWSeAPc5tNl+4rw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lv29xB9X8UrIajc75kl7TC+Zk2be2YZgJozjuHegyFnsp6U4rfNXzz2wbf1dJ+jxb hLrWf4GV0rWRWspbXwd+ZGwd/Mft7sOnm7eUKx0wStrqmrCqP0rOO18YjMTaXA8aFg i9sW1XUqBJARGLtO5WG+KUiQxEG1ShanCUu8Ynx8= 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 7/7] KVM: SVM: hyper-v: Direct Virtual Flush support Date: Thu, 15 Apr 2021 13:43:42 +0000 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >From Hyper-V TLFS: "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." Add the Direct Virtual Flush support for SVM. Related VMX changes: commit 6f6a657c9998 ("KVM/Hyper-V/VMX: Add direct tlb flush support") Signed-off-by: Vineeth Pillai --- arch/x86/kvm/svm/svm.c | 48 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index f59f03b5c722..cff01256c47e 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -443,6 +443,32 @@ static void svm_init_osvw(struct kvm_vcpu *vcpu) vcpu->arch.osvw.status |= 1; } +#if IS_ENABLED(CONFIG_HYPERV) +static int hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu) +{ + struct hv_enlightenments *hve; + struct hv_partition_assist_pg **p_hv_pa_pg = + &to_kvm_hv(vcpu->kvm)->hv_pa_pg; + + if (!*p_hv_pa_pg) + *p_hv_pa_pg = kzalloc(PAGE_SIZE, GFP_KERNEL); + + if (!*p_hv_pa_pg) + return -ENOMEM; + + hve = (struct hv_enlightenments *)&to_svm(vcpu)->vmcb->hv_enlightenments; + + hve->partition_assist_page = __pa(*p_hv_pa_pg); + hve->hv_vm_id = (unsigned long)vcpu->kvm; + if (!hve->hv_enlightenments_control.nested_flush_hypercall) { + hve->hv_enlightenments_control.nested_flush_hypercall = 1; + vmcb_mark_dirty(to_svm(vcpu)->vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS); + } + + return 0; +} +#endif + static int has_svm(void) { const char *msg; @@ -1037,6 +1063,21 @@ static __init int svm_hardware_setup(void) svm_x86_ops.tlb_remote_flush_with_range = kvm_hv_remote_flush_tlb_with_range; } + + if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) { + pr_info("kvm: Hyper-V Direct TLB Flush enabled\n"); + for_each_online_cpu(cpu) { + struct hv_vp_assist_page *vp_ap = + hv_get_vp_assist_page(cpu); + + if (!vp_ap) + continue; + + vp_ap->nested_control.features.directhypercall = 1; + } + svm_x86_ops.enable_direct_tlbflush = + hv_enable_direct_tlbflush; + } #endif if (nrips) { @@ -3921,6 +3962,13 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu) } svm->vmcb->save.cr2 = vcpu->arch.cr2; +#if IS_ENABLED(CONFIG_HYPERV) + if (svm->vmcb->hv_enlightenments.hv_vp_id != to_hv_vcpu(vcpu)->vp_index) { + svm->vmcb->hv_enlightenments.hv_vp_id = to_hv_vcpu(vcpu)->vp_index; + vmcb_mark_dirty(svm->vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS); + } +#endif + /* * Run with all-zero DR6 unless needed, so that we can get the exact cause * of a #DB. -- 2.25.1