From patchwork Mon Nov 16 18:26:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Isaku Yamahata X-Patchwork-Id: 11910333 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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 9F856C64E69 for ; Mon, 16 Nov 2020 18:28:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 78753241A3 for ; Mon, 16 Nov 2020 18:28:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388409AbgKPS2i (ORCPT ); Mon, 16 Nov 2020 13:28:38 -0500 Received: from mga02.intel.com ([134.134.136.20]:48461 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388350AbgKPS2Y (ORCPT ); Mon, 16 Nov 2020 13:28:24 -0500 IronPort-SDR: 2NAb9x1av2R5apCQGoZ41S3XFhLPFWhuWWf7tI2dwyY0GpYVrAPK5Msceovz+3vPGsjun8y2K5 F07dzokQUuTQ== X-IronPort-AV: E=McAfee;i="6000,8403,9807"; a="157819220" X-IronPort-AV: E=Sophos;i="5.77,483,1596524400"; d="scan'208";a="157819220" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Nov 2020 10:28:23 -0800 IronPort-SDR: SdA6ZcXzGnuhcWBYFW0bgewEnreUvA1yTxRfIvU5avyG+OQsqjJt1nGl0BWrPrhl2iKtHRoEwc e9+HnkO5+Vqg== X-IronPort-AV: E=Sophos;i="5.77,483,1596524400"; d="scan'208";a="400528406" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Nov 2020 10:28:23 -0800 From: isaku.yamahata@intel.com To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , Paolo Bonzini , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: isaku.yamahata@intel.com, isaku.yamahata@gmail.com, Sean Christopherson Subject: [RFC PATCH 65/67] KVM: x86: Mark the VM (TD) as bugged if non-coherent DMA is detected Date: Mon, 16 Nov 2020 10:26:50 -0800 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Sean Christopherson TDX is not supported on platforms with non-coherent IOMMUs, freak out if one is encountered, and because SEPT doesn't allow the memtype control that's needed to support non-coherent DMA. Signed-off-by: Sean Christopherson --- arch/x86/kvm/x86.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 5566e7f25ce6..05dbdfdd7a8b 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -11144,6 +11144,7 @@ EXPORT_SYMBOL_GPL(kvm_arch_has_assigned_device); void kvm_arch_register_noncoherent_dma(struct kvm *kvm) { + KVM_BUG_ON(kvm->arch.vm_type == KVM_X86_TDX_VM, kvm); atomic_inc(&kvm->arch.noncoherent_dma_count); } EXPORT_SYMBOL_GPL(kvm_arch_register_noncoherent_dma);