From nobody Wed May 15 09:29:46 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.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; Authentication-Results: mx.zohomail.com; spf=pass (zoho.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=intel.com ARC-Seal: i=1; a=rsa-sha256; t=1561364989; cv=none; d=zoho.com; s=zohoarc; b=WU+v3R7X39bE78fRRLui5rjjP7qx9mIoyfzhamNt3EnvW2JRgVL99W5lywtf8s9g/54YWHHQoaMKX7jBNDzUGPtWwXWTpQMmXU4P/uNLHhlcILTi1z/Hg6+lumLvG25lbonFVtaGuleq4GmJp6XUqkzhTr9rJdDATEcf33pnPTc= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1561364989; h=Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:Sender:Subject:To:ARC-Authentication-Results; bh=fECOG1hCBzdsdGTI0KVGMYOCl+VLKilscjc0xxa7SKc=; b=Kh5yVrl+fIkgtTFYIZSNMNh9+VPqR8K7G9kOSLWWR1LpWqttVl8Ng6qxgBatHdR1xiG5A0eJBodcmaph63kDUqoQmrZYpLWjK8ks1zeTpZXreV++WmndDfMGUUbxUmVzGHmnwTdSYhwXFwJS4zwk0eiZ9RAXFOZP683HZq6FRQc= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.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 header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (209.51.188.17 [209.51.188.17]) by mx.zohomail.com with SMTPS id 1561364989034550.7489147188609; Mon, 24 Jun 2019 01:29:49 -0700 (PDT) Received: from localhost ([::1]:48738 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hfKMA-0000Ie-Ji for importer@patchew.org; Mon, 24 Jun 2019 04:29:42 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:39183) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hfKL5-0007uj-JC for qemu-devel@nongnu.org; Mon, 24 Jun 2019 04:28:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hfKL3-0007ys-JD for qemu-devel@nongnu.org; Mon, 24 Jun 2019 04:28:35 -0400 Received: from mga05.intel.com ([192.55.52.43]:5381) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hfKL3-0007sY-Aq for qemu-devel@nongnu.org; Mon, 24 Jun 2019 04:28:33 -0400 Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 24 Jun 2019 01:28:26 -0700 Received: from joy-desktop.sh.intel.com ([10.239.13.126]) by fmsmga006.fm.intel.com with ESMTP; 24 Jun 2019 01:28:25 -0700 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,411,1557212400"; d="scan'208";a="359942961" From: Yan Zhao To: pbonzini@redhat.com Date: Mon, 24 Jun 2019 16:26:21 +0800 Message-Id: <1561364781-6897-1-git-send-email-yan.y.zhao@intel.com> X-Mailer: git-send-email 2.7.4 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.43 Subject: [Qemu-devel] [PATCH v2] memory: warning on out of scope notification 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: Auger Eric , Yan Zhao , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" if an entry has parts out of scope of notifier's range, print warning message. Out of scope mapping/unmapping would cause problem, as in below case: 1. initially there are two notifiers with ranges 0-0xfedfffff, 0xfef00000-0xffffffffffffffff, IOVAs from 0x3c000000 - 0x3c1fffff is in shadow page table. 2. in vfio, memory_region_register_iommu_notifier() is followed by memory_region_iommu_replay(), which will first call address space unmap, and walk and add back all entries in vtd shadow page table. e.g. (1) for notifier 0-0xfedfffff, IOVAs from 0 - 0xffffffff get unmapped, and IOVAs from 0x3c000000 - 0x3c1fffff get mapped (2) for notifier 0xfef00000-0xffffffffffffffff IOVAs from 0 - 0x7fffffffff get unmapped, but IOVAs from 0x3c000000 - 0x3c1fffff cannot get mapped back. Cc: Auger Eric Signed-off-by: Yan Zhao --- v2: 1. added a local variable entry_end (Auger Eric) 2. using PRIx64 as format for address range in warning message (Auger Eric) --- memory.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/memory.c b/memory.c index 0a089a7..3aacc09 100644 --- a/memory.c +++ b/memory.c @@ -1937,12 +1937,13 @@ void memory_region_notify_one(IOMMUNotifier *notifi= er, IOMMUTLBEntry *entry) { IOMMUNotifierFlag request_flags; + hwaddr entry_end =3D entry->iova + entry->addr_mask; =20 /* * Skip the notification if the notification does not overlap * with registered range. */ - if (notifier->start > entry->iova + entry->addr_mask || + if (notifier->start > entry_end || notifier->end < entry->iova) { return; } @@ -1953,6 +1954,16 @@ void memory_region_notify_one(IOMMUNotifier *notifie= r, request_flags =3D IOMMU_NOTIFIER_UNMAP; } =20 + if (entry->iova < notifier->start || + entry_end > notifier->end) { + warn_report("%s IOMMUTLBEntry 0x%" PRIx64 "-0x%" PRIx64 + "outside of notifier scope 0x%" PRIx64 "-0x%" PRIx64, + (request_flags =3D=3D IOMMU_NOTIFIER_MAP) ? + "Mapping" : "Unmapping", + entry->iova, entry->iova + entry->addr_mask, + notifier->start, notifier->end); + } + if (notifier->notifier_flags & request_flags) { notifier->notify(notifier, entry); } --=20 2.7.4