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 07AE3C43219 for ; Tue, 4 Oct 2022 12:43:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230189AbiJDMne (ORCPT ); Tue, 4 Oct 2022 08:43:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58298 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230088AbiJDMmv (ORCPT ); Tue, 4 Oct 2022 08:42:51 -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 ESMTPS id 450BF5E540 for ; Tue, 4 Oct 2022 05:41:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1664887262; 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=hf23owwXyl4mzv8DXKFj7XQPTlriWIPQsbBxFbBqkTQ=; b=am8eITCmhcuNHoZiE6116zk1R9/y0BjHgvqCRsl+4ANzXZZtEWnmmdRy4zDAlELWDbW19N dftVzd69sZW/HdfEa1Z6zFKrG4za60LBxdGOairmiZP3cDgLy5p0hkNEbl613a/hSmhNI5 vvIeLuHVMR7xVO1ff6reGMhtW06zv+w= 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-184-IcepnKkxM4C4B6vydlEl9Q-1; Tue, 04 Oct 2022 08:40:59 -0400 X-MC-Unique: IcepnKkxM4C4B6vydlEl9Q-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B174B85A59D; Tue, 4 Oct 2022 12:40:58 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.192.255]) by smtp.corp.redhat.com (Postfix) with ESMTP id BFF2D7AE5; Tue, 4 Oct 2022 12:40:56 +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 v11 24/46] KVM: x86: hyper-v: Introduce fast guest_hv_cpuid_has_l2_tlb_flush() check Date: Tue, 4 Oct 2022 14:39:34 +0200 Message-Id: <20221004123956.188909-25-vkuznets@redhat.com> In-Reply-To: <20221004123956.188909-1-vkuznets@redhat.com> References: <20221004123956.188909-1-vkuznets@redhat.com> MIME-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 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. Reviewed-by: Maxim Levitsky Signed-off-by: Vitaly Kuznetsov --- arch/x86/kvm/hyperv.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h index 7706e203ff43..bd698eb2bda1 100644 --- a/arch/x86/kvm/hyperv.h +++ b/arch/x86/kvm/hyperv.h @@ -174,6 +174,14 @@ static inline void kvm_hv_vcpu_purge_flush_tlb(struct kvm_vcpu *vcpu) 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_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); -- 2.37.3