From patchwork Thu Nov 25 00:20:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Isaku Yamahata X-Patchwork-Id: 12638221 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 A6828C4332F for ; Thu, 25 Nov 2021 00:23:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353840AbhKYA0N (ORCPT ); Wed, 24 Nov 2021 19:26:13 -0500 Received: from mga09.intel.com ([134.134.136.24]:6524 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352966AbhKYAY1 (ORCPT ); Wed, 24 Nov 2021 19:24:27 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10178"; a="235227034" X-IronPort-AV: E=Sophos;i="5.87,261,1631602800"; d="scan'208";a="235227034" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Nov 2021 16:21:15 -0800 X-IronPort-AV: E=Sophos;i="5.87,261,1631602800"; d="scan'208";a="675042231" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Nov 2021 16:21:14 -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 , erdemaktas@google.com, Connor Kuehl , Sean Christopherson , linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: isaku.yamahata@intel.com, isaku.yamahata@gmail.com, Sean Christopherson Subject: [RFC PATCH v3 32/59] KVM: x86/mmu: Explicitly check for MMIO spte in fast page fault Date: Wed, 24 Nov 2021 16:20:15 -0800 Message-Id: <530d97b430b592207eccf063bfa2fdf7c0b50e4d.1637799475.git.isaku.yamahata@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Sean Christopherson Explicity check for an MMIO spte in the fast page fault flow. TDX will use a not-present entry for MMIO sptes, which can be mistaken for an access-tracked spte since both have SPTE_SPECIAL_MASK set. Signed-off-by: Sean Christopherson Signed-off-by: Isaku Yamahata --- arch/x86/kvm/mmu/mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 5305d1d9a976..01569913f1f0 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -3186,7 +3186,7 @@ static int fast_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) break; sp = sptep_to_sp(sptep); - if (!is_last_spte(spte, sp->role.level)) + if (!is_last_spte(spte, sp->role.level) || is_mmio_spte(spte)) break; /*