From patchwork Thu Apr 30 08:13:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Yan Zhao X-Patchwork-Id: 1280051 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=2001:470:142::17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=intel.com Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:470:142::17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 49CT5S6zRDz9sSM for ; Thu, 30 Apr 2020 18:27:24 +1000 (AEST) Received: from localhost ([::1]:42602 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jU4XQ-000151-QU for incoming@patchwork.ozlabs.org; Thu, 30 Apr 2020 04:27:20 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:41292) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jU4Wt-000104-Al for qemu-devel@nongnu.org; Thu, 30 Apr 2020 04:27:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.90_1) (envelope-from ) id 1jU4U7-0002EG-MA for qemu-devel@nongnu.org; Thu, 30 Apr 2020 04:26:47 -0400 Received: from mga14.intel.com ([192.55.52.115]:10658) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jU4U7-0002E0-4v for qemu-devel@nongnu.org; Thu, 30 Apr 2020 04:23:55 -0400 IronPort-SDR: mQfk6FIm7S1rFrHx+3Y7yv1J7lCeilJQNrOIRw7yNOqAUk/9xF4zJdgJzKxqPaTVaiy+TLcYoJ N7+63h1de9Kw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Apr 2020 01:23:53 -0700 IronPort-SDR: sor0dj/ImWEAu+nCB0L0H3+VmscKb5QjBSTKC71GyDWOCMdrdM0YZSw+DQ83sXrTWRZCdh14L6 604yrLkklAGA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,334,1583222400"; d="scan'208";a="282785028" Received: from joy-optiplex-7040.sh.intel.com ([10.239.13.16]) by fmsmga004.fm.intel.com with ESMTP; 30 Apr 2020 01:23:50 -0700 From: Yan Zhao To: pbonzini@redhat.com, alex.williamson@redhat.com Subject: [PATCH v6 3/3] hw/vfio: let read-only flag take effect for mmap'd regions Date: Thu, 30 Apr 2020 04:13:53 -0400 Message-Id: <20200430081353.31400-1-yan.y.zhao@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200430080744.31232-1-yan.y.zhao@intel.com> References: <20200430080744.31232-1-yan.y.zhao@intel.com> MIME-Version: 1.0 Received-SPF: pass client-ip=192.55.52.115; envelope-from=yan.y.zhao@intel.com; helo=mga14.intel.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/04/30 03:10:52 X-ACL-Warn: Detected OS = FreeBSD 9.x or newer [fuzzy] X-Received-From: 192.55.52.115 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: Yan Zhao , xin.zeng@intel.com, philmd@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" along side setting host page table to be read-only, the memory regions are also required to be read-only, so that when guest writes to the read-only & mmap'd regions, vmexits would happen and region write handlers are called. Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Yan Zhao Signed-off-by: Xin Zeng --- hw/vfio/common.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 2a4fedfeaa..bf510e66c0 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -980,6 +980,10 @@ int vfio_region_mmap(VFIORegion *region) name, region->mmaps[i].size, region->mmaps[i].mmap); g_free(name); + + if (!(region->flags & VFIO_REGION_INFO_FLAG_WRITE)) { + memory_region_set_readonly(®ion->mmaps[i].mem, true); + } memory_region_add_subregion(region->mem, region->mmaps[i].offset, ®ion->mmaps[i].mem);