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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 516BDC433EF for ; Fri, 27 May 2022 15:58:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354073AbiE0P6O (ORCPT ); Fri, 27 May 2022 11:58:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47362 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353916AbiE0P5J (ORCPT ); Fri, 27 May 2022 11:57:09 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E2A9A60044 for ; Fri, 27 May 2022 08:56:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1653667002; 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=Mp+uwMRPnuRsZiZ9Kz2NLFRaPoq+EAB2LDuMVK5icXw=; b=F6v4J9YshvVQhDqUEeTPSBgv0eFxzM+UvoYL347hMMsX+oVK1FH12TObEgPf6bG692ugDP A5Gbhcs2U0XfoEqge8qqJVtD3XRNSHGTKumV2FmrfIaHxSJ0an+fYHcNvAMkdtRedhDhwh CbiiJ3gS2jJ4OJQTaWhaB19TsoJLbAc= 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-384-b2e1gTZ7NICr_EkU5VIDhA-1; Fri, 27 May 2022 11:56:39 -0400 X-MC-Unique: b2e1gTZ7NICr_EkU5VIDhA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0C23A80B71A; Fri, 27 May 2022 15:56:39 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.192.126]) by smtp.corp.redhat.com (Postfix) with ESMTP id C918C2166B26; Fri, 27 May 2022 15:56:36 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Maxim Levitsky , Wanpeng Li , Jim Mattson , Michael Kelley , Siddharth Chandrasekaran , Yuan Yao , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 18/37] KVM: x86: hyper-v: Introduce fast guest_hv_cpuid_has_l2_tlb_flush() check Date: Fri, 27 May 2022 17:55:27 +0200 Message-Id: <20220527155546.1528910-19-vkuznets@redhat.com> In-Reply-To: <20220527155546.1528910-1-vkuznets@redhat.com> References: <20220527155546.1528910-1-vkuznets@redhat.com> MIME-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce a helper to quickly check if KVM needs to handle VMCALL/VMMCALL from L2 in L0 to process L2 TLB flush requests. Signed-off-by: Vitaly Kuznetsov --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/hyperv.c | 6 ++++++ arch/x86/kvm/hyperv.h | 7 +++++++ 3 files changed, 14 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 16fdea767209..25113cc9b050 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -642,6 +642,7 @@ struct kvm_vcpu_hv { u32 enlightenments_eax; /* HYPERV_CPUID_ENLIGHTMENT_INFO.EAX */ u32 enlightenments_ebx; /* HYPERV_CPUID_ENLIGHTMENT_INFO.EBX */ u32 syndbg_cap_eax; /* HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES.EAX */ + u32 nested_features_eax; /* HYPERV_CPUID_NESTED_FEATURES.EAX */ } cpuid_cache; struct kvm_vcpu_hv_tlb_flush_fifo tlb_flush_fifo[HV_NR_TLB_FLUSH_FIFOS]; diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 740190917c1c..4396d75588d8 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -2229,6 +2229,12 @@ void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu) hv_vcpu->cpuid_cache.syndbg_cap_eax = entry->eax; else hv_vcpu->cpuid_cache.syndbg_cap_eax = 0; + + entry = kvm_find_cpuid_entry(vcpu, HYPERV_CPUID_NESTED_FEATURES, 0); + if (entry) + hv_vcpu->cpuid_cache.nested_features_eax = entry->eax; + else + hv_vcpu->cpuid_cache.nested_features_eax = 0; } int kvm_hv_set_enforce_cpuid(struct kvm_vcpu *vcpu, bool enforce) diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h index 7778b3a5913c..2aa6fb7fc599 100644 --- a/arch/x86/kvm/hyperv.h +++ b/arch/x86/kvm/hyperv.h @@ -170,6 +170,13 @@ static inline void kvm_hv_vcpu_empty_flush_tlb(struct kvm_vcpu *vcpu, bool is_gu kfifo_reset_out(&tlb_flush_fifo->entries); } +static inline bool guest_hv_cpuid_has_l2_tlb_flush(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + + return hv_vcpu && (hv_vcpu->cpuid_cache.nested_features_eax & HV_X64_NESTED_DIRECT_FLUSH); +} + static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu) { struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); -- 2.35.3