From patchwork Fri Oct 21 15:35:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 6775 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4242:0:0:0:0:0 with SMTP id s2csp765661wrr; Fri, 21 Oct 2022 08:40:06 -0700 (PDT) X-Google-Smtp-Source: AMsMyM7NXYUDZPAsWxVluuoAI6CB2iR8U1jTicYFcxfBL3M2LlBGNQkokNydWZLHXwZvhXskZO05 X-Received: by 2002:a17:906:9bc3:b0:78d:816f:3743 with SMTP id de3-20020a1709069bc300b0078d816f3743mr16263475ejc.380.1666366805848; Fri, 21 Oct 2022 08:40:05 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1666366805; cv=none; d=google.com; s=arc-20160816; b=j9gcfr7bAhuulMBdiGg81LtNQ8jRTGyK+T8oMwf575W9sgpva46zJoho9cgRV5zDsf 9w3WnfRZSTNROYMerT0ES61YZNquYk5YJnt3IB+aHwVtXFH649Btq2BXggqTqCGkn/BI v40l2s+fYpBH8Vv2TCPT7izMKeQlch1CbUI/tLTrI8qyER348fkdFvKSNlWGqgEJn5z8 lm3TGu8sNQc3EDLz5QgmVg2Sdlco2VIfuXjr1kd04L7JKFhJFG4NGP274dbhccXg6bWj giuK8lp2IDEw+41brD9fRym+VrgWFD3UZ1UgI1PD61xnwJiV7tdYIM5jBJGiXKw27t5V d5HA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=qqHREcEHDZGw6V5kQ5rLnZdtdmUr7P71TBx5BsB4kN4=; b=obESQsmaLr/e6Iyz9cu7ZvvM2VnaVG+H2z1Bz/qottVO4hQZcKXP/QgiWWjN+FB139 t0bIt1cNS2MtKJJTq4BozoWKxl1kcAikJQ7opHuT/1Q/pWvuOkQUe8Q+3q/b6kfYoQTg MQ2bXsx2F0iibRqOmFadJlwsRicOEbfyuax1ni9r5w5uhUGjTuikWsGJ5ec0BRbjMUtj cd6iXrjgygNL8osPF/J1tUQEQYxDCALP2Amq5DH+sutN2LqTkRafCUp0bHTlqaY/xyxJ ZqDsnoiuts+NYbnkJbGmXDlIIaQPSWkVrYJjP6CXHGswPoneUq5L0hDVBG3OhXhabDZS Am4w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=MpfyMbES; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id e5-20020a170906844500b007836227b96fsi15831221ejy.888.2022.10.21.08.39.39; Fri, 21 Oct 2022 08:40:05 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=MpfyMbES; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231211AbiJUPiS (ORCPT + 99 others); Fri, 21 Oct 2022 11:38:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46972 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230316AbiJUPgx (ORCPT ); Fri, 21 Oct 2022 11:36:53 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 00C979C223 for ; Fri, 21 Oct 2022 08:36:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1666366591; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qqHREcEHDZGw6V5kQ5rLnZdtdmUr7P71TBx5BsB4kN4=; b=MpfyMbESiuLNLgobg+iOuF8P0yMQbXegKwCQlj9WJ14PD8YATHEJXIUDQ6QCr9ycw5wP6X I+tk9troOj5qaaXYcETmFWMIXfcLz4CZdVXIFx5rJXous/YfDnMmmdJM+tOOoRyf82J46P 0H4vn4muznQlMvnM4gs//SrNmGfxOXE= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-25-6Dz-3_WCMxasxyEciQ8OxQ-1; Fri, 21 Oct 2022 11:36:30 -0400 X-MC-Unique: 6Dz-3_WCMxasxyEciQ8OxQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 9BF9E857ABF; Fri, 21 Oct 2022 15:36:29 +0000 (UTC) Received: from ovpn-192-65.brq.redhat.com (ovpn-192-65.brq.redhat.com [10.40.192.65]) by smtp.corp.redhat.com (Postfix) with ESMTP id C851940CA41F; Fri, 21 Oct 2022 15:36:27 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini , Sean Christopherson Cc: Wanpeng Li , Jim Mattson , Michael Kelley , Siddharth Chandrasekaran , Yuan Yao , Maxim Levitsky , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v12 26/46] KVM: nVMX: hyper-v: Enable L2 TLB flush Date: Fri, 21 Oct 2022 17:35:01 +0200 Message-Id: <20221021153521.1216911-27-vkuznets@redhat.com> In-Reply-To: <20221021153521.1216911-1-vkuznets@redhat.com> References: <20221021153521.1216911-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747312239492459353?= X-GMAIL-MSGID: =?utf-8?q?1747312239492459353?= Enable L2 TLB flush feature on nVMX when: - Enlightened VMCS is in use. - The feature flag is enabled in eVMCS. - The feature flag is enabled in partition assist page. Perform synthetic vmexit to L1 after processing TLB flush call upon request (HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH). Note: nested_evmcs_l2_tlb_flush_enabled() uses cached VP assist page copy which gets updated from nested_vmx_handle_enlightened_vmptrld(). This is also guaranteed to happen post migration with eVMCS backed L2 running. Signed-off-by: Vitaly Kuznetsov --- arch/x86/include/asm/hyperv-tlfs.h | 9 +++++++++ arch/x86/kvm/vmx/hyperv.c | 17 +++++++++++++++++ arch/x86/kvm/vmx/hyperv.h | 1 + arch/x86/kvm/vmx/nested.c | 20 ++++++++++++++++++++ 4 files changed, 47 insertions(+) diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index 6639979302ab..b25c6792d409 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -600,6 +600,15 @@ struct hv_enlightened_vmcs { #define HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL 0xFFFF +/* + * Note, Hyper-V isn't actually stealing bit 28 from Intel, just abusing it by + * pairing it with architecturally impossible exit reasons. Bit 28 is set only + * on SMI exits to a SMI transfer monitor (STM) and if and only if a MTF VM-Exit + * is pending. I.e. it will never be set by hardware for non-SMI exits (there + * are only three), nor will it ever be set unless the VMM is an STM. + */ +#define HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH 0x10000031 + /* * Hyper-V uses the software reserved 32 bytes in VMCB control area to expose * SVM enlightenments to guests. diff --git a/arch/x86/kvm/vmx/hyperv.c b/arch/x86/kvm/vmx/hyperv.c index bceca1a99804..04a0bba58c7d 100644 --- a/arch/x86/kvm/vmx/hyperv.c +++ b/arch/x86/kvm/vmx/hyperv.c @@ -5,6 +5,7 @@ #include "../cpuid.h" #include "hyperv.h" +#include "nested.h" #include "vmcs.h" #include "vmx.h" #include "trace.h" @@ -500,6 +501,22 @@ int nested_enable_evmcs(struct kvm_vcpu *vcpu, return 0; } +bool nested_evmcs_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + struct vcpu_vmx *vmx = to_vmx(vcpu); + struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs; + + if (!hv_vcpu || !evmcs) + return false; + + if (!evmcs->hv_enlightenments_control.nested_flush_hypercall) + return false; + + return hv_vcpu->vp_assist_page.nested_control.features.directhypercall; +} + void vmx_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu) { + nested_vmx_vmexit(vcpu, HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH, 0, 0); } diff --git a/arch/x86/kvm/vmx/hyperv.h b/arch/x86/kvm/vmx/hyperv.h index 8bf366730d33..571e7929d14e 100644 --- a/arch/x86/kvm/vmx/hyperv.h +++ b/arch/x86/kvm/vmx/hyperv.h @@ -243,6 +243,7 @@ int nested_enable_evmcs(struct kvm_vcpu *vcpu, uint16_t *vmcs_version); void nested_evmcs_filter_control_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata); int nested_evmcs_check_controls(struct vmcs12 *vmcs12); +bool nested_evmcs_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu); void vmx_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu); #endif /* __KVM_X86_VMX_HYPERV_H */ diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index 29a210df4066..d9814b91877c 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -1131,6 +1131,15 @@ static void nested_vmx_transition_tlb_flush(struct kvm_vcpu *vcpu, { struct vcpu_vmx *vmx = to_vmx(vcpu); + /* + * KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or + * L2's VP_ID upon request from the guest. Make sure we check for + * pending entries in the right FIFO upon L1/L2 transition as these + * requests are put by other vCPUs asynchronously. + */ + if (to_hv_vcpu(vcpu) && enable_ept) + kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu); + /* * If vmcs12 doesn't use VPID, L1 expects linear and combined mappings * for *all* contexts to be flushed on VM-Enter/VM-Exit, i.e. it's a @@ -3266,6 +3275,12 @@ static bool nested_get_vmcs12_pages(struct kvm_vcpu *vcpu) static bool vmx_get_nested_state_pages(struct kvm_vcpu *vcpu) { + /* + * Note: nested_get_evmcs_page() also updates 'vp_assist_page' copy + * in 'struct kvm_vcpu_hv' in case eVMCS is in use, this is mandatory + * to make nested_evmcs_l2_tlb_flush_enabled() work correctly post + * migration. + */ if (!nested_get_evmcs_page(vcpu)) { pr_debug_ratelimited("%s: enlightened vmptrld failed\n", __func__); @@ -6142,6 +6157,11 @@ static bool nested_vmx_l0_wants_exit(struct kvm_vcpu *vcpu, * Handle L2's bus locks in L0 directly. */ return true; + case EXIT_REASON_VMCALL: + /* Hyper-V L2 TLB flush hypercall is handled by L0 */ + return guest_hv_cpuid_has_l2_tlb_flush(vcpu) && + nested_evmcs_l2_tlb_flush_enabled(vcpu) && + kvm_hv_is_tlb_flush_hcall(vcpu); default: break; }