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Wed, 23 Sep 2020 05:47:10 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-215-n61frQ6VNrezlZqimImCXQ-1; Wed, 23 Sep 2020 05:47:06 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3ED20186DD29; Wed, 23 Sep 2020 09:47:05 +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 D535155778; Wed, 23 Sep 2020 09:47:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600854428; 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=NHtq1ZlVg94Kf+6wpeThJeaxQyTxlv+PX6zeAnjEKIs=; b=AWjuLq/nJmFq1ihDRTT3xGJzHzuveGfZaMbLyqQDjPW8BXoK+dipnILfCkIrBd/IS7liru 6kCRccHSjVnwGOJOs3uXzvho/KKcgXfoYvkxWOQjScX3PzJdrZ04bGyV80+Mb/6RY9HK98 rCC4C0SAm+cK4DpyaxWeQLYJfGT4X1k= X-MC-Unique: n61frQ6VNrezlZqimImCXQ-1 From: Igor Mammedov To: qemu-devel@nongnu.org Subject: [PATCH v6 02/11] x86: cpuhp: prevent guest crash on CPU hotplug when broadcast SMI is in use Date: Wed, 23 Sep 2020 05:46:41 -0400 Message-Id: <20200923094650.1301166-3-imammedo@redhat.com> In-Reply-To: <20200923094650.1301166-1-imammedo@redhat.com> References: <20200923094650.1301166-1-imammedo@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 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-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; 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charset="utf-8" There were reports of guest crash on CPU hotplug, when using q35 machine type and OVMF with SMM, due to hotplugged CPU trying to process SMI at default SMI handler location without it being relocated by firmware first. Fix it by refusing hotplug if firmware hasn't negotiated CPU hotplug with SMI support while SMI broadcast is in use. Signed-off-by: Igor Mammedov Reviewed-by: Laszlo Ersek Tested-by: Laszlo Ersek --- v6: - rebase on top of current master, due to non trivial conflicts caused by microvm series, which moved/renamed pc_cpu_pre_plug() (Ankur Arora ) v1: fix typos an use suggested wording in commit and error msg s/secure boot/smm/; s/hotplug SMI/hotplug with SMI/ (Laszlo Ersek ) --- hw/acpi/ich9.c | 12 +++++++++++- hw/i386/x86.c | 11 +++++++++++ 2 files changed, 22 insertions(+), 1 deletion(-) diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c index 6a19070cec..0acc9a3107 100644 --- a/hw/acpi/ich9.c +++ b/hw/acpi/ich9.c @@ -408,10 +408,20 @@ void ich9_pm_device_pre_plug_cb(HotplugHandler *hotpl= ug_dev, DeviceState *dev, ICH9LPCState *lpc =3D ICH9_LPC_DEVICE(hotplug_dev); =20 if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) && - !lpc->pm.acpi_memory_hotplug.is_enabled) + !lpc->pm.acpi_memory_hotplug.is_enabled) { error_setg(errp, "memory hotplug is not enabled: %s.memory-hotplug-suppo= rt " "is not set", object_get_typename(OBJECT(lpc))); + } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) { + uint64_t negotiated =3D lpc->smi_negotiated_features; + + if (negotiated & BIT_ULL(ICH9_LPC_SMI_F_BROADCAST_BIT) && + !(negotiated & BIT_ULL(ICH9_LPC_SMI_F_CPU_HOTPLUG_BIT))) { + error_setg(errp, "cpu hotplug with SMI wasn't enabled by firmw= are"); + error_append_hint(errp, "update machine type to newer than 5.1= " + "and firmware that suppors CPU hotplug with SMM"); + } + } } =20 void ich9_pm_device_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, diff --git a/hw/i386/x86.c b/hw/i386/x86.c index c2ea989579..403c2b1dad 100644 --- a/hw/i386/x86.c +++ b/hw/i386/x86.c @@ -279,6 +279,17 @@ void x86_cpu_pre_plug(HotplugHandler *hotplug_dev, return; } =20 + if (x86ms->acpi_dev) { + Error *local_err =3D NULL; + + hotplug_handler_pre_plug(HOTPLUG_HANDLER(x86ms->acpi_dev), dev, + &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + } + init_topo_info(&topo_info, x86ms); =20 env->nr_dies =3D x86ms->smp_dies; --=20 2.27.0