From patchwork Mon Nov 16 13:22:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zenghui Yu X-Patchwork-Id: 1400926 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=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=huawei.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4CZVJy38X8z9sPB for ; Tue, 17 Nov 2020 00:28:50 +1100 (AEDT) Received: from localhost ([::1]:33384 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1keeYq-0004cy-0X for incoming@patchwork.ozlabs.org; Mon, 16 Nov 2020 08:28:48 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:43152) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1keeTO-0000Ua-41; Mon, 16 Nov 2020 08:23:10 -0500 Received: from szxga04-in.huawei.com ([45.249.212.190]:2794) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1keeTK-00074r-Ai; Mon, 16 Nov 2020 08:23:09 -0500 Received: from DGGEMS403-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4CZV9q2p8VzkWWG; Mon, 16 Nov 2020 21:22:39 +0800 (CST) Received: from DESKTOP-8RFUVS3.china.huawei.com (10.174.185.179) by DGGEMS403-HUB.china.huawei.com (10.3.19.203) with Microsoft SMTP Server id 14.3.487.0; Mon, 16 Nov 2020 21:22:49 +0800 From: Zenghui Yu To: , Subject: [PATCH] memory: Skip dirty tracking for un-migratable memory regions Date: Mon, 16 Nov 2020 21:22:10 +0800 Message-ID: <20201116132210.1730-1-yuzenghui@huawei.com> X-Mailer: git-send-email 2.23.0.windows.1 MIME-Version: 1.0 X-Originating-IP: [10.174.185.179] X-CFilter-Loop: Reflected Received-SPF: pass client-ip=45.249.212.190; envelope-from=yuzenghui@huawei.com; helo=szxga04-in.huawei.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/16 08:22:57 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: cohuck@redhat.com, kwankhede@nvidia.com, alex.williamson@redhat.com, qemu-arm@nongnu.org, Zenghui Yu , wanghaibin.wang@huawei.com, kvmarm@lists.cs.columbia.edu Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" It makes no sense to track dirty pages for those un-migratable memory regions (e.g., Memory BAR region of the VFIO PCI device) and doing so will potentially lead to some unpleasant issues during migration [1]. Skip dirty tracking for those regions by evaluating if the region is migratable before setting dirty_log_mask (DIRTY_MEMORY_MIGRATION). [1] https://lists.gnu.org/archive/html/qemu-devel/2020-11/msg03757.html Signed-off-by: Zenghui Yu Reviewed-by: Cornelia Huck --- softmmu/memory.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/softmmu/memory.c b/softmmu/memory.c index 71951fe4dc..aa393f1bb0 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1806,7 +1806,10 @@ bool memory_region_is_ram_device(MemoryRegion *mr) uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr) { uint8_t mask = mr->dirty_log_mask; - if (global_dirty_log && (mr->ram_block || memory_region_is_iommu(mr))) { + RAMBlock *rb = mr->ram_block; + + if (global_dirty_log && ((rb && qemu_ram_is_migratable(rb)) || + memory_region_is_iommu(mr))) { mask |= (1 << DIRTY_MEMORY_MIGRATION); } return mask;