From nobody Mon Feb 9 09:32:44 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 72E1D14C587 for ; Fri, 12 Apr 2024 17:35:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712943340; cv=none; b=bOLe5n8Q6pCoMH/89Dy849Lc0vBiOT2mCVYzWh7xxWylBJwRTVKV0SdPdndEi0g+RBjswiRTlUMvtiO9wR/GDMWAp1oCF4LV3EJHqR6eTKviEZ2KGAQjcdulxoIlGFLjODdRCJzlU454TRLKMqLpI5pornitSnPg+w4dYOPaTqc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712943340; c=relaxed/simple; bh=tyupKYJfJ6wUCBKagrJYDTzs+21RQitJjEjiingM43U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=WpBDCDefFfFYtKXLFYJ6pMMb6q56k8tdGELyOyeZx7bVqFcumHNBWaIB35+BFVh0eNei2rg41+QLD68XZ6Q30kpHZarIJKlr5oBiGsvuL9e4HBoLJM8mWeRkdinFJAeYa0A6Xs8sk+kEhRuiZhpljsUNWyNUrtL9s/Olo0dK9ag= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=UEitSjz+; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="UEitSjz+" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1712943336; 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=Lh2ftKfkt80GAjRs7lEWYPdh10rTxqxXazW5P8DK/QA=; b=UEitSjz+NrTgDLEORhdEzgFJyCc7+C588NiJtuathLFng3gHigZcJNudlY6Vj8otjFb7Jb 1DxuGyZl0R0prEEYe05TAB8wEgjDU9yuqD8VI2gcnSl3bwtY2LR4qBWRqAdZcvYu4zVFeg WS1QN2kh9v8hKpzNIs9dGf+rK8EUiuo= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-74-kCHz7X5UN7C5Sq2DUXAWLQ-1; Fri, 12 Apr 2024 13:35:34 -0400 X-MC-Unique: kCHz7X5UN7C5Sq2DUXAWLQ-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 1890D104B504; Fri, 12 Apr 2024 17:35:34 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id E0664492BC7; Fri, 12 Apr 2024 17:35:33 +0000 (UTC) From: Paolo Bonzini To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Sean Christopherson , Isaku Yamahata , Xiaoyao Li , Binbin Wu Subject: [PATCH 05/10] KVM: x86/mmu: Track shadow MMIO value on a per-VM basis Date: Fri, 12 Apr 2024 13:35:27 -0400 Message-ID: <20240412173532.3481264-6-pbonzini@redhat.com> In-Reply-To: <20240412173532.3481264-1-pbonzini@redhat.com> References: <20240412173532.3481264-1-pbonzini@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 Content-Type: text/plain; charset="utf-8" From: Sean Christopherson TDX will use a different shadow PTE entry value for MMIO from VMX. Add a member to kvm_arch and track value for MMIO per-VM instead of a global variable. By using the per-VM EPT entry value for MMIO, the existing VMX logic is kept working. Introduce a separate setter function so that guest TD can use a different value later. Signed-off-by: Sean Christopherson Signed-off-by: Isaku Yamahata Message-Id: <229a18434e5d83f45b1fcd7bf1544d79db1becb6.1705965635.git.isaku.= yamahata@intel.com> Reviewed-by: Xiaoyao Li Reviewed-by: Binbin Wu Signed-off-by: Paolo Bonzini --- arch/x86/include/asm/kvm_host.h | 2 ++ arch/x86/kvm/mmu/mmu.c | 7 ++++--- arch/x86/kvm/mmu/spte.c | 4 ++-- arch/x86/kvm/mmu/spte.h | 4 ++-- arch/x86/kvm/mmu/tdp_mmu.c | 6 +++--- 5 files changed, 13 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_hos= t.h index 67dc108dd366..23f1b123830a 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1313,6 +1313,8 @@ struct kvm_arch { */ spinlock_t mmu_unsync_pages_lock; =20 + u64 shadow_mmio_value; + struct iommu_domain *iommu_domain; bool iommu_noncoherent; #define __KVM_HAVE_ARCH_NONCOHERENT_DMA diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index addd7f7f7606..edfc6d67692b 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -2462,7 +2462,7 @@ static int mmu_page_zap_pte(struct kvm *kvm, struct k= vm_mmu_page *sp, return kvm_mmu_prepare_zap_page(kvm, child, invalid_list); } - } else if (is_mmio_spte(pte)) { + } else if (is_mmio_spte(kvm, pte)) { mmu_spte_clear_no_track(spte); } return 0; @@ -4144,7 +4144,7 @@ static int handle_mmio_page_fault(struct kvm_vcpu *vc= pu, u64 addr, bool direct) if (WARN_ON_ONCE(reserved)) return -EINVAL; =20 - if (is_mmio_spte(spte)) { + if (is_mmio_spte(vcpu->kvm, spte)) { gfn_t gfn =3D get_mmio_spte_gfn(spte); unsigned int access =3D get_mmio_spte_access(spte); =20 @@ -4768,7 +4768,7 @@ EXPORT_SYMBOL_GPL(kvm_mmu_new_pgd); static bool sync_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, gfn_t gfn, unsigned int access) { - if (unlikely(is_mmio_spte(*sptep))) { + if (unlikely(is_mmio_spte(vcpu->kvm, *sptep))) { if (gfn !=3D get_mmio_spte_gfn(*sptep)) { mmu_spte_clear_no_track(sptep); return true; @@ -6275,6 +6275,7 @@ static bool kvm_has_zapped_obsolete_pages(struct kvm = *kvm) =20 void kvm_mmu_init_vm(struct kvm *kvm) { + kvm->arch.shadow_mmio_value =3D shadow_mmio_value; INIT_LIST_HEAD(&kvm->arch.active_mmu_pages); INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages); INIT_LIST_HEAD(&kvm->arch.possible_nx_huge_pages); diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c index d97c4725c0b7..3faa16f5777e 100644 --- a/arch/x86/kvm/mmu/spte.c +++ b/arch/x86/kvm/mmu/spte.c @@ -74,10 +74,10 @@ u64 make_mmio_spte(struct kvm_vcpu *vcpu, u64 gfn, unsi= gned int access) u64 spte =3D generation_mmio_spte_mask(gen); u64 gpa =3D gfn << PAGE_SHIFT; =20 - WARN_ON_ONCE(!shadow_mmio_value); + WARN_ON_ONCE(!vcpu->kvm->arch.shadow_mmio_value); =20 access &=3D shadow_mmio_access_mask; - spte |=3D shadow_mmio_value | access; + spte |=3D vcpu->kvm->arch.shadow_mmio_value | access; spte |=3D gpa | shadow_nonpresent_or_rsvd_mask; spte |=3D (gpa & shadow_nonpresent_or_rsvd_mask) << SHADOW_NONPRESENT_OR_RSVD_MASK_LEN; diff --git a/arch/x86/kvm/mmu/spte.h b/arch/x86/kvm/mmu/spte.h index 465fa283326b..b7ee32061cf6 100644 --- a/arch/x86/kvm/mmu/spte.h +++ b/arch/x86/kvm/mmu/spte.h @@ -265,9 +265,9 @@ static inline struct kvm_mmu_page *root_to_sp(hpa_t roo= t) return spte_to_child_sp(root); } =20 -static inline bool is_mmio_spte(u64 spte) +static inline bool is_mmio_spte(struct kvm *kvm, u64 spte) { - return (spte & shadow_mmio_mask) =3D=3D shadow_mmio_value && + return (spte & shadow_mmio_mask) =3D=3D kvm->arch.shadow_mmio_value && likely(enable_mmio_caching); } =20 diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index f5401967897a..5fd618abc243 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -495,8 +495,8 @@ static void handle_changed_spte(struct kvm *kvm, int as= _id, gfn_t gfn, * impact the guest since both the former and current SPTEs * are nonpresent. */ - if (WARN_ON_ONCE(!is_mmio_spte(old_spte) && - !is_mmio_spte(new_spte) && + if (WARN_ON_ONCE(!is_mmio_spte(kvm, old_spte) && + !is_mmio_spte(kvm, new_spte) && !is_removed_spte(new_spte))) pr_err("Unexpected SPTE change! Nonpresent SPTEs\n" "should not be replaced with another,\n" @@ -1028,7 +1028,7 @@ static int tdp_mmu_map_handle_target_level(struct kvm= _vcpu *vcpu, } =20 /* If a MMIO SPTE is installed, the MMIO will need to be emulated. */ - if (unlikely(is_mmio_spte(new_spte))) { + if (unlikely(is_mmio_spte(vcpu->kvm, new_spte))) { vcpu->stat.pf_mmio_spte_created++; trace_mark_mmio_spte(rcu_dereference(iter->sptep), iter->gfn, new_spte); --=20 2.43.0