From patchwork Thu Apr 7 15:56:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 12805454 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 B94C5C4332F for ; Thu, 7 Apr 2022 15:57:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345374AbiDGP7e (ORCPT ); Thu, 7 Apr 2022 11:59:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48208 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345323AbiDGP7Y (ORCPT ); Thu, 7 Apr 2022 11:59:24 -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 CD668CF4A9 for ; Thu, 7 Apr 2022 08:57:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1649347043; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iMe5Oduunuesf3FhSoPCafQt+YvZyvPbDReH4c42VIA=; b=DX3UQ44TC/skX/uGMymUEUiO1M0gQZG9RwG4mh+icdJOaKj7PsGzsVZ+qNiTqPFk8p6KGy v7kua7tcvhDi5JkLaTGuKkZo6NzxShmL6wIXSUGNhrHjW/hKG3dJij+0kyX7/E4/GzwbEm KGoSn6aCdge+Vt2i8O/Hrnpgic8WNzg= 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-608-lyw2sD0IM-2XapZI4qUUjw-1; Thu, 07 Apr 2022 11:57:20 -0400 X-MC-Unique: lyw2sD0IM-2XapZI4qUUjw-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7448E18A6585; Thu, 7 Apr 2022 15:57:19 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.192.50]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6BF7054AC84; Thu, 7 Apr 2022 15:57:17 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Wanpeng Li , Jim Mattson , Michael Kelley , Siddharth Chandrasekaran , linux-kernel@vger.kernel.org Subject: [PATCH v2 14/31] KVM: x86: hyper-v: Introduce fast kvm_hv_direct_tlb_flush_exposed() check Date: Thu, 7 Apr 2022 17:56:28 +0200 Message-Id: <20220407155645.940890-15-vkuznets@redhat.com> In-Reply-To: <20220407155645.940890-1-vkuznets@redhat.com> References: <20220407155645.940890-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Introduce a helper to quickly check if KVM needs to handle VMCALL/VMMCALL from L2 in L0 to process Direct 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 7c607307a5d4..3be54b51d6bc 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -615,6 +615,7 @@ 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; /* Two rings for regular Hyper-V TLB flush and Direct TLB flush */ diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 2b12f1b5c992..f08cf295d750 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -2256,6 +2256,12 @@ 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 3687e1e61e0d..c4f8064da606 100644 --- a/arch/x86/kvm/hyperv.h +++ b/arch/x86/kvm/hyperv.h @@ -169,6 +169,13 @@ static inline void kvm_hv_vcpu_empty_flush_tlb(struct kvm_vcpu *vcpu) tlb_flush_ring->read_idx = tlb_flush_ring->write_idx; } +static inline bool kvm_hv_direct_tlb_flush_exposed(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);