From nobody Tue Feb 10 03:16:18 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=gmail.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1625706406854873.6891393605819; Wed, 7 Jul 2021 18:06:46 -0700 (PDT) Received: from localhost ([::1]:39636 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m1IV3-0006Gh-Ql for importer@patchew.org; Wed, 07 Jul 2021 21:06:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38096) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1IKq-00026E-TP for qemu-devel@nongnu.org; Wed, 07 Jul 2021 20:56:12 -0400 Received: from mga12.intel.com ([192.55.52.136]:57606) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1IKn-0007L7-Ls for qemu-devel@nongnu.org; Wed, 07 Jul 2021 20:56:12 -0400 Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jul 2021 17:55:58 -0700 Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jul 2021 17:55:58 -0700 X-IronPort-AV: E=McAfee;i="6200,9189,10038"; a="189101729" X-IronPort-AV: E=Sophos;i="5.84,222,1620716400"; d="scan'208";a="189101729" X-IronPort-AV: E=Sophos;i="5.84,222,1620716400"; d="scan'208";a="423770104" From: isaku.yamahata@gmail.com To: qemu-devel@nongnu.org, pbonzini@redhat.com, alistair@alistair23.me, ehabkost@redhat.com, marcel.apfelbaum@gmail.com, mst@redhat.com, cohuck@redhat.com, mtosatti@redhat.com, xiaoyao.li@intel.com, seanjc@google.com, erdemaktas@google.com Subject: [RFC PATCH v2 35/44] ioapic: add property to disable level interrupt Date: Wed, 7 Jul 2021 17:55:05 -0700 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=192.55.52.136; envelope-from=isaku.yamahata@intel.com; helo=mga12.intel.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_ADSP_CUSTOM_MED=0.001, FORGED_GMAIL_RCVD=1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, NML_ADSP_CUSTOM_MED=0.9, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: isaku.yamahata@intel.com, isaku.yamahata@gmail.com, kvm@vger.kernel.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZM-MESSAGEID: 1625706408174100004 Content-Type: text/plain; charset="utf-8" From: Isaku Yamahata According to TDX module spec version 344425-002US [1], VMM can inject virtual interrupt only via posted interrupt and VMM can't get TDEXIT on guest EOI to virtual x2APIC. Because posted interrupt is edge-trigger and VMM needs to hook guest EOI to re-inject level-triggered interrupt if the level still active, level-trigger isn't supported for TD Guest VM. Prevent trigger mode from setting to be level trigger with warning. Without this guard, qemu can result in unexpected behavior later. [1] https://software.intel.com/content/dam/develop/external/us/en/documents= /tdx-module-1eas-v0.85.039.pdf Signed-off-by: Isaku Yamahata --- hw/intc/ioapic.c | 20 ++++++++++++++++++++ hw/intc/ioapic_common.c | 27 +++++++++++++++++++++++++++ include/hw/i386/ioapic_internal.h | 1 + 3 files changed, 48 insertions(+) diff --git a/hw/intc/ioapic.c b/hw/intc/ioapic.c index 264262959d..6d61744961 100644 --- a/hw/intc/ioapic.c +++ b/hw/intc/ioapic.c @@ -364,6 +364,23 @@ ioapic_fix_edge_remote_irr(uint64_t *entry) } } =20 +static inline void +ioapic_fix_level_trigger_unsupported(uint64_t *entry) +{ + if ((*entry & IOAPIC_LVT_TRIGGER_MODE) !=3D + IOAPIC_TRIGGER_EDGE << IOAPIC_LVT_TRIGGER_MODE_SHIFT) { + /* + * ignore a request for level trigger because + * level trigger requires eoi intercept to re-inject + * interrupt when the level is still active. + */ + warn_report_once("attempting to set level-trigger mode " + "while eoi intercept isn't supported"); + *entry &=3D ~IOAPIC_LVT_TRIGGER_MODE; + *entry |=3D IOAPIC_TRIGGER_EDGE << IOAPIC_LVT_TRIGGER_MODE_SHIFT; + } +} + static void ioapic_mem_write(void *opaque, hwaddr addr, uint64_t val, unsigned int size) @@ -404,6 +421,9 @@ ioapic_mem_write(void *opaque, hwaddr addr, uint64_t va= l, s->ioredtbl[index] &=3D IOAPIC_RW_BITS; s->ioredtbl[index] |=3D ro_bits; s->irq_eoi[index] =3D 0; + if (s->level_trigger_unsupported) { + ioapic_fix_level_trigger_unsupported(&s->ioredtbl[inde= x]); + } ioapic_fix_edge_remote_irr(&s->ioredtbl[index]); ioapic_service(s); } diff --git a/hw/intc/ioapic_common.c b/hw/intc/ioapic_common.c index 3cccfc1556..07ee142470 100644 --- a/hw/intc/ioapic_common.c +++ b/hw/intc/ioapic_common.c @@ -150,6 +150,32 @@ static int ioapic_dispatch_post_load(void *opaque, int= version_id) return 0; } =20 +static bool ioapic_common_get_level_trigger_unsupported(Object *obj, + Error **errp) +{ + IOAPICCommonState *s =3D IOAPIC_COMMON(obj); + return s->level_trigger_unsupported; +} + +static void ioapic_common_set_level_trigger_unsupported(Object *obj, bool = value, + Error **errp) +{ + DeviceState *dev =3D DEVICE(obj); + IOAPICCommonState *s =3D IOAPIC_COMMON(obj); + /* only disabling before realize is allowed */ + assert(!dev->realized); + assert(!s->level_trigger_unsupported); + s->level_trigger_unsupported =3D value; +} + +static void ioapic_common_init(Object *obj) +{ + object_property_add_bool(obj, "level_trigger_unsupported", + ioapic_common_get_level_trigger_unsupported, + ioapic_common_set_level_trigger_unsupported); + +} + static void ioapic_common_realize(DeviceState *dev, Error **errp) { IOAPICCommonState *s =3D IOAPIC_COMMON(dev); @@ -207,6 +233,7 @@ static const TypeInfo ioapic_common_type =3D { .name =3D TYPE_IOAPIC_COMMON, .parent =3D TYPE_SYS_BUS_DEVICE, .instance_size =3D sizeof(IOAPICCommonState), + .instance_init =3D ioapic_common_init, .class_size =3D sizeof(IOAPICCommonClass), .class_init =3D ioapic_common_class_init, .abstract =3D true, diff --git a/include/hw/i386/ioapic_internal.h b/include/hw/i386/ioapic_int= ernal.h index 021e715f11..20f2fc7897 100644 --- a/include/hw/i386/ioapic_internal.h +++ b/include/hw/i386/ioapic_internal.h @@ -103,6 +103,7 @@ struct IOAPICCommonState { uint32_t irr; uint64_t ioredtbl[IOAPIC_NUM_PINS]; Notifier machine_done; + bool level_trigger_unsupported; uint8_t version; uint64_t irq_count[IOAPIC_NUM_PINS]; int irq_level[IOAPIC_NUM_PINS]; --=20 2.25.1