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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1737394431; 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; bh=LI69RojN9MS6X67G+6PFICT4TXr7Kpr6ojIMw/CF1Rs=; b=SS56Ut3PWIjZY06cfnHbi+HvVb2U8R5AAP71dwwX5CZwS5LG5XF8OgyRlRFec2PknT6CSI eMeBI80ZFyamEOVFLMdLTUP1rZ/61Q5Zf1GvTwJITct3WXKipWV8OYnfW83/1BUa37JgYR YLWP4olAdx48+Vud0JzHf3uOX2T7UH4= X-MC-Unique: 7HuKB7TTNH2uPS1_un0EcQ-1 X-Mimecast-MFC-AGG-ID: 7HuKB7TTNH2uPS1_un0EcQ From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, mst@redhat.com, jasowang@redhat.com, sgarzare@redhat.com, lvivier@redhat.com Cc: zhenzhong.duan@intel.com Subject: [PATCH] hw/virtio/vhost: Disable IOTLB callbacks when IOMMU gets disabled Date: Mon, 20 Jan 2025 18:33:39 +0100 Message-ID: <20250120173339.865681-1-eric.auger@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 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" When a guest exposed with a vhost device and protected by an intel IOMMU gets rebooted, we sometimes observe a spurious warning: Fail to lookup the translated address ffffe000 We observe that the IOMMU gets disabled through a write to the global command register (CMAR_GCMD.TE) before the vhost device gets stopped. When this warning happens it can be observed an inflight IOTLB miss occurs after the IOMMU disable and before the vhost stop. In that case a flat translation occurs and the check in vhost_memory_region_lookup() fails. Let's disable the IOTLB callbacks when all IOMMU MRs have been unregistered. Signed-off-by: Eric Auger --- hw/virtio/vhost.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 6aa72fd434..128c2ab094 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -931,6 +931,10 @@ static void vhost_iommu_region_del(MemoryListener *lis= tener, break; } } + if (QLIST_EMPTY(&dev->iommu_list) && + dev->vhost_ops->vhost_set_iotlb_callback) { + dev->vhost_ops->vhost_set_iotlb_callback(dev, false); + } } =20 void vhost_toggle_device_iotlb(VirtIODevice *vdev) --=20 2.47.1