From nobody Sun Feb 8 23:19:07 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; 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=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 164927160264286.3510406500111; Wed, 6 Apr 2022 12:00:02 -0700 (PDT) Received: from localhost ([::1]:34120 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ncAsr-0005yk-98 for importer@patchew.org; Wed, 06 Apr 2022 15:00:01 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49428) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ncArF-00055a-Mr for qemu-devel@nongnu.org; Wed, 06 Apr 2022 14:58:21 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:31171) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ncArC-0006Rm-Uq for qemu-devel@nongnu.org; Wed, 06 Apr 2022 14:58:20 -0400 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-642-iwoN7yeJP4SHCQ5K3Kv0ZQ-1; Wed, 06 Apr 2022 14:58:15 -0400 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0BB2C811E75; Wed, 6 Apr 2022 18:58:15 +0000 (UTC) Received: from dell-r430-03.lab.eng.brq.redhat.com (dell-r430-03.lab.eng.brq.redhat.com [10.37.153.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id C4AFE401052; Wed, 6 Apr 2022 18:58:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1649271498; 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; bh=KYMraUZ4E/JzgxZrp21pEF3WQLDV2uo1tCk0cUe8h5U=; b=WbsChgr3XhkHjNrZenU/KMRRDRC2d46CAU7GmiJJT5FNrWQu7eQwivonffq3uTqrL2/2S4 mkOsjcFHvsFmtY3m8fvi9VV5tS6tQkj5s+LHuT89pqQ87UXtONQ02Fsj9x8+ZojGxzl203 GG7rAnhdwNHHmkd2Ab4kEufBlK0bT7s= X-MC-Unique: iwoN7yeJP4SHCQ5K3Kv0ZQ-1 From: Igor Mammedov To: qemu-devel@nongnu.org Subject: [PATCH v2] acpi: fix acpi_index migration Date: Wed, 6 Apr 2022 14:58:12 -0400 Message-Id: <20220406185812.1055724-1-imammedo@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.10 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=imammedo@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" 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=170.10.133.124; envelope-from=imammedo@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, quintela@redhat.com, mst@redhat.com, dgilbert@redhat.com, peterx@redhat.com, alex.williamson@redhat.com, leobras@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1649271604717100003 From: "Dr. David Alan Gilbert" vmstate_acpi_pcihp_use_acpi_index() was expecting AcpiPciHpState as state but it actually received PIIX4PMState, because VMSTATE_PCI_HOTPLUG is a macro and not another struct. So it ended up accessing random pointer, which resulted in 'false' return value and acpi_index field wasn't ever sent. However in 7.0 that pointer de-references to value > 0, and destination QEMU starts to expect the field which isn't sent in migratioon stream from older QEMU (6.2 and older). As result migration fails with: qemu-system-x86_64: Missing section footer for 0000:00:01.3/piix4_pm qemu-system-x86_64: load of migration failed: Invalid argument In addition with QEMU-6.2, destination due to not expected state, also never expects the acpi_index field in migration stream. Q35 is not affected as it always sends/expects the field as long as acpi based PCI hotplug is enabled. Fix issue by introducing compat knob to never send/expect acpi_index in migration stream for 6.2 and older PC machine types and always send it for 7.0 and newer PC machine types. Diagnosed-by: Dr. David Alan Gilbert Fixes: b32bd76 ("pci: introduce acpi-index property for PCI device") Resolves: https://gitlab.com/qemu-project/qemu/-/issues/932 Signed-off-by: Igor Mammedov Reviewed-by: Dr. David Alan Gilbert Reviewed-by: Michael S. Tsirkin --- include/hw/acpi/pcihp.h | 2 -- hw/acpi/acpi-pci-hotplug-stub.c | 4 ---- hw/acpi/pcihp.c | 6 ------ hw/acpi/piix4.c | 15 ++++++++++++++- hw/core/machine.c | 4 +++- 5 files changed, 17 insertions(+), 14 deletions(-) diff --git a/include/hw/acpi/pcihp.h b/include/hw/acpi/pcihp.h index af1a169fc3..7e268c2c9c 100644 --- a/include/hw/acpi/pcihp.h +++ b/include/hw/acpi/pcihp.h @@ -73,8 +73,6 @@ void acpi_pcihp_reset(AcpiPciHpState *s, bool acpihp_root= _off); =20 extern const VMStateDescription vmstate_acpi_pcihp_pci_status; =20 -bool vmstate_acpi_pcihp_use_acpi_index(void *opaque, int version_id); - #define VMSTATE_PCI_HOTPLUG(pcihp, state, test_pcihp, test_acpi_index) \ VMSTATE_UINT32_TEST(pcihp.hotplug_select, state, \ test_pcihp), \ diff --git a/hw/acpi/acpi-pci-hotplug-stub.c b/hw/acpi/acpi-pci-hotplug-stu= b.c index 734e4c5986..a43f6dafc9 100644 --- a/hw/acpi/acpi-pci-hotplug-stub.c +++ b/hw/acpi/acpi-pci-hotplug-stub.c @@ -41,7 +41,3 @@ void acpi_pcihp_reset(AcpiPciHpState *s, bool acpihp_root= _off) return; } =20 -bool vmstate_acpi_pcihp_use_acpi_index(void *opaque, int version_id) -{ - return false; -} diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c index 6351bd3424..bf65bbea49 100644 --- a/hw/acpi/pcihp.c +++ b/hw/acpi/pcihp.c @@ -554,12 +554,6 @@ void acpi_pcihp_init(Object *owner, AcpiPciHpState *s,= PCIBus *root_bus, OBJ_PROP_FLAG_READ); } =20 -bool vmstate_acpi_pcihp_use_acpi_index(void *opaque, int version_id) -{ - AcpiPciHpState *s =3D opaque; - return s->acpi_index; -} - const VMStateDescription vmstate_acpi_pcihp_pci_status =3D { .name =3D "acpi_pcihp_pci_status", .version_id =3D 1, diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c index cc37fa3416..fe5625d07a 100644 --- a/hw/acpi/piix4.c +++ b/hw/acpi/piix4.c @@ -82,6 +82,7 @@ struct PIIX4PMState { AcpiPciHpState acpi_pci_hotplug; bool use_acpi_hotplug_bridge; bool use_acpi_root_pci_hotplug; + bool not_migrate_acpi_index; =20 uint8_t disable_s3; uint8_t disable_s4; @@ -267,6 +268,16 @@ static bool piix4_vmstate_need_smbus(void *opaque, int= version_id) return pm_smbus_vmstate_needed(); } =20 +/* + * This is a fudge to turn off the acpi_index field, + * whose test was always broken on piix4 with 6.2 and older machine types. + */ +static bool vmstate_test_migrate_acpi_index(void *opaque, int version_id) +{ + PIIX4PMState *s =3D PIIX4_PM(opaque); + return s->use_acpi_hotplug_bridge && !s->not_migrate_acpi_index; +} + /* qemu-kvm 1.2 uses version 3 but advertised as 2 * To support incoming qemu-kvm 1.2 migration, change version_id * and minimum_version_id to 2 below (which breaks migration from @@ -297,7 +308,7 @@ static const VMStateDescription vmstate_acpi =3D { struct AcpiPciHpPciStatus), VMSTATE_PCI_HOTPLUG(acpi_pci_hotplug, PIIX4PMState, vmstate_test_use_acpi_hotplug_bridge, - vmstate_acpi_pcihp_use_acpi_index), + vmstate_test_migrate_acpi_index), VMSTATE_END_OF_LIST() }, .subsections =3D (const VMStateDescription*[]) { @@ -652,6 +663,8 @@ static Property piix4_pm_properties[] =3D { DEFINE_PROP_BOOL("memory-hotplug-support", PIIX4PMState, acpi_memory_hotplug.is_enabled, true), DEFINE_PROP_BOOL("smm-compat", PIIX4PMState, smm_compat, false), + DEFINE_PROP_BOOL("x-not-migrate-acpi-index", PIIX4PMState, + not_migrate_acpi_index, false), DEFINE_PROP_END_OF_LIST(), }; =20 diff --git a/hw/core/machine.c b/hw/core/machine.c index d856485cb4..1e23fdc14b 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -37,7 +37,9 @@ #include "hw/virtio/virtio.h" #include "hw/virtio/virtio-pci.h" =20 -GlobalProperty hw_compat_6_2[] =3D {}; +GlobalProperty hw_compat_6_2[] =3D { + { "PIIX4_PM", "x-not-migrate-acpi-index", "on"}, +}; const size_t hw_compat_6_2_len =3D G_N_ELEMENTS(hw_compat_6_2); =20 GlobalProperty hw_compat_6_1[] =3D { --=20 2.31.1