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Thu, 07 May 2020 10:32:43 -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-16-jHpqjUd9NPew0Jew_Hg4Hw-1; Thu, 07 May 2020 10:32:37 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 17BEA872FE2; Thu, 7 May 2020 14:32:36 +0000 (UTC) Received: from laptop.redhat.com (ovpn-114-214.ams2.redhat.com [10.36.114.214]) by smtp.corp.redhat.com (Postfix) with ESMTP id BE14D7055D; Thu, 7 May 2020 14:32:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588861962; 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=dC1vT8dt9LW/27Vku2CwU7FmTQyZcHt3xOQtVefn2R0=; b=foZWEx90PM7N9w2DIfjatCDYy+uiwbXAtRVrHTu5em9JyBqF7L2jmenv0u5CcoR88X0Q1s ABss95NSOlsxxrpQV908jHDgLKfW06/QJ2HwPWsiN4Tf+y62MFRk3mf8mlB8YbPWxYtVTZ 3hQeenDx4+icDUOoX3fGYntRTJ+OY0A= X-MC-Unique: jHpqjUd9NPew0Jew_Hg4Hw-1 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, jean-philippe@linaro.org, bbhushan2@marvell.com, peterx@redhat.com, armbru@redhat.com Subject: [PATCH 5/5] hw/arm/virt: Let the virtio-iommu bypass MSIs Date: Thu, 7 May 2020 16:32:01 +0200 Message-Id: <20200507143201.31080-6-eric.auger@redhat.com> In-Reply-To: <20200507143201.31080-1-eric.auger@redhat.com> References: <20200507143201.31080-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 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; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.139.110.120; envelope-from=eric.auger@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/07 03:15:48 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, 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_H2=-0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: mst@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" At the moment the virtio-iommu translates MSI transactions. This behavior is inherited from ARM SMMU. The virt machine code knows where the guest MSI doorbells are so we can easily declare those regions as VIRTIO_IOMMU_RESV_MEM_T_MSI. With that setting the guest will not map MSIs through the IOMMU and those transactions will be simply bypassed. The ITS does MSI translation anyway. Signed-off-by: Eric Auger --- hw/arm/virt.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/hw/arm/virt.c b/hw/arm/virt.c index 171e6908ec..6a041e97a5 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -2138,6 +2138,11 @@ static void virt_machine_device_pre_plug_cb(HotplugH= andler *hotplug_dev, { if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) { virt_memory_pre_plug(hotplug_dev, dev, errp); + } else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_IOMMU_PCI)) { + /* we declare a VIRTIO_IOMMU_RESV_MEM_T_MSI region */ + qdev_prop_set_uint32(dev, "len-reserved-regions", 1); + qdev_prop_set_string(dev, "reserved-regions[0]", + "0x8090000, 0x809FFFF, 1"); } } =20 --=20 2.20.1