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[99.254.114.190]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6ce008aff31sm51871076d6.12.2024.10.24.09.56.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Oct 2024 09:56:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1729788996; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=c0kLRIPNRsyiUEIuptSmNc8rruH765h3xOHpyL+r4uw=; b=SFztNE60EY86SVUKL/uWH5gxEz4x8TpJNJfJQ/snsg+LcPvKqdOOyzupxU332s7RoevEov FlKj60pmLwkX4M7yK6PcrZmZmbPc6aUO8FxmIHwIOddpX8hyEO0K/yyHin0vEoHUDiNcH/ M1xp6XtwJwt+lmHMYLSvBev+IbOSQOA= X-MC-Unique: fAtS33IKPi63denm6uL7yw-1 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729788994; x=1730393794; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=c0kLRIPNRsyiUEIuptSmNc8rruH765h3xOHpyL+r4uw=; b=n0uPClROqKuXG7wr4SP5xdFg1oO15GmwS3bnQqNEPqeYYqC9YY23/WRwUbI0vobCIR AYTYLzXn3laZz5quxVVcmNY2N0Rwqx+j9SJsVmbSgr6l7aKPXZ/5ontUJlU6i98g1zNk CuqEZ0pLM86iwYo1jcVzP5aCuDVpVDrAPaWD2wxhIKBxZI8kBBetmF0+94Fs6DZWwDZ6 GtESv211L6XejDB6COxCi14cKZefDPFQhRd8AV5GUCifLCaZev64hb6H9olAawUIHnad d5mj4R7wM91C4576JaGdCDiM6BZgIxU15WLGRn3kmFpr82GVhBEtu0OiKnoNPecqKalB mW1A== X-Gm-Message-State: AOJu0YxQ/c7+vupOr9SeEdh97rCDB/J4lgjARWMUMKs0uCYeLCclTz8O 0icwn9GTGzbgOnsCh8XjM29pwJq/eJw/G/HypW687Kus2mduaOltbwYyReqnGG+PJm3p6t3585z +YFZEzOVMF1sxjs/VJgVOE5FgxUt0czTXDcpBpq0g8r28g+NimfEkgjDXYCisb0OgPn40crY5Ol +HMtMgVWHev+YqUevDpXq4DrYgQKIX4qhd3A== X-Received: by 2002:a05:6214:4b08:b0:6ce:d6c:499b with SMTP id 6a1803df08f44-6ce3427b2d2mr79501936d6.42.1729788994212; Thu, 24 Oct 2024 09:56:34 -0700 (PDT) X-Google-Smtp-Source: AGHT+IG4neWev4q6Z4s9HREWkITl0xNMDbmLGQIm86O/0DXT0Uyol03xhdKJKN0gtBVqo6enK+iUNQ== X-Received: by 2002:a05:6214:4b08:b0:6ce:d6c:499b with SMTP id 6a1803df08f44-6ce3427b2d2mr79501606d6.42.1729788993831; Thu, 24 Oct 2024 09:56:33 -0700 (PDT) From: Peter Xu To: qemu-devel@nongnu.org Cc: peterx@redhat.com, Fabiano Rosas , Igor Mammedov , Juraj Marcin , "Michael S . Tsirkin" , "Dr . David Alan Gilbert" , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Markus Armbruster , Eduardo Habkost , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , Alex Williamson , Paolo Bonzini , Peter Maydell Subject: [PATCH 2/4] x86/iommu: Make x86-iommu a singleton object Date: Thu, 24 Oct 2024 12:56:25 -0400 Message-ID: <20241024165627.1372621-3-peterx@redhat.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20241024165627.1372621-1-peterx@redhat.com> References: <20241024165627.1372621-1-peterx@redhat.com> 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=170.10.133.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.263, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1729789094511116600 Content-Type: text/plain; charset="utf-8" X86 IOMMUs cannot be created more than one on a system yet. Make it a singleton so it guards the system from accidentally create yet another IOMMU object when one already presents. Now if someone tries to create more than one, e.g., via: ./qemu -M q35 -device intel-iommu -device intel-iommu The error will change from: qemu-system-x86_64: -device intel-iommu: QEMU does not support multiple v= IOMMUs for x86 yet. To: qemu-system-x86_64: -device intel-iommu: Class 'intel-iommu' only support= s one instance Unfortunately, yet we can't remove the singleton check in the machine hook (pc_machine_device_pre_plug_cb), because there can also be virtio-iommu involved, which doesn't share a common parent class yet. But with this, it should be closer to reach that goal to check singleton by QOM one day. Signed-off-by: Peter Xu --- hw/i386/x86-iommu.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/hw/i386/x86-iommu.c b/hw/i386/x86-iommu.c index 60af896225..4bfeb08705 100644 --- a/hw/i386/x86-iommu.c +++ b/hw/i386/x86-iommu.c @@ -26,6 +26,7 @@ #include "qemu/error-report.h" #include "trace.h" #include "sysemu/kvm.h" +#include "qom/object_interfaces.h" =20 void x86_iommu_iec_register_notifier(X86IOMMUState *iommu, iec_notify_fn fn, void *data) @@ -133,10 +134,19 @@ static Property x86_iommu_properties[] =3D { DEFINE_PROP_END_OF_LIST(), }; =20 +static Object *x86_iommu_get_instance(Error **errp) +{ + return OBJECT(x86_iommu_get_default()); +} + static void x86_iommu_class_init(ObjectClass *klass, void *data) { DeviceClass *dc =3D DEVICE_CLASS(klass); + SingletonClass *singleton =3D SINGLETON_CLASS(klass); + dc->realize =3D x86_iommu_realize; + singleton->get_instance =3D x86_iommu_get_instance; + device_class_set_props(dc, x86_iommu_properties); } =20 @@ -152,6 +162,10 @@ static const TypeInfo x86_iommu_info =3D { .class_init =3D x86_iommu_class_init, .class_size =3D sizeof(X86IOMMUClass), .abstract =3D true, + .interfaces =3D (InterfaceInfo[]) { + { TYPE_SINGLETON }, + { } + } }; =20 static void x86_iommu_register_types(void) --=20 2.45.0