From patchwork Thu Dec 17 01:49:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keqian Zhu X-Patchwork-Id: 1417440 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 4CxFND00m9z9sTK for ; Thu, 17 Dec 2020 12:51:39 +1100 (AEDT) Received: from localhost ([::1]:47430 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kpiSA-0000z3-0g for incoming@patchwork.ozlabs.org; Wed, 16 Dec 2020 20:51:38 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51798) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kpiR8-0000yN-Uj; Wed, 16 Dec 2020 20:50:35 -0500 Received: from szxga07-in.huawei.com ([45.249.212.35]:2609) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kpiR5-0005tC-Dr; Wed, 16 Dec 2020 20:50:34 -0500 Received: from DGGEMS402-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4CxFKz3bs1z7Fhk; Thu, 17 Dec 2020 09:49:43 +0800 (CST) Received: from DESKTOP-5IS4806.china.huawei.com (10.174.187.37) by DGGEMS402-HUB.china.huawei.com (10.3.19.202) with Microsoft SMTP Server id 14.3.498.0; Thu, 17 Dec 2020 09:50:14 +0800 From: Keqian Zhu To: Peter Maydell , Paolo Bonzini , "Dr . David Alan Gilbert" , Andrew Jones , Peter Xu Subject: [PATCH v2 2/2] accel: kvm: Add aligment assert for kvm_log_clear_one_slot Date: Thu, 17 Dec 2020 09:49:41 +0800 Message-ID: <20201217014941.22872-3-zhukeqian1@huawei.com> X-Mailer: git-send-email 2.8.4.windows.1 In-Reply-To: <20201217014941.22872-1-zhukeqian1@huawei.com> References: <20201217014941.22872-1-zhukeqian1@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.187.37] X-CFilter-Loop: Reflected Received-SPF: pass client-ip=45.249.212.35; envelope-from=zhukeqian1@huawei.com; helo=szxga07-in.huawei.com 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: jiangkunkun@huawei.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, Zenghui Yu , wanghaibin.wang@huawei.com, Keqian Zhu Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The parameters start and size are transfered from QEMU memory emulation layer. It can promise that they are TARGET_PAGE_SIZE aligned. However, KVM needs they are qemu_real_page_size aligned. Though no caller breaks this aligned requirement currently, we'd better add an explicit assert to avoid future breaking. Signed-off-by: Keqian Zhu Reviewed-by: Andrew Jones Acked-by: Peter Xu --- accel/kvm/kvm-all.c | 7 +++++++ 1 file changed, 7 insertions(+) --- v2 - Address Andrew's commment (Use assert instead of return err). diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index f6b16a8df8..73b195cc41 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -692,6 +692,10 @@ out: #define KVM_CLEAR_LOG_ALIGN (qemu_real_host_page_size << KVM_CLEAR_LOG_SHIFT) #define KVM_CLEAR_LOG_MASK (-KVM_CLEAR_LOG_ALIGN) +/* + * As the granule of kvm dirty log is qemu_real_host_page_size, + * @start and @size are expected and restricted to align to it. + */ static int kvm_log_clear_one_slot(KVMSlot *mem, int as_id, uint64_t start, uint64_t size) { @@ -701,6 +705,9 @@ static int kvm_log_clear_one_slot(KVMSlot *mem, int as_id, uint64_t start, unsigned long *bmap_clear = NULL, psize = qemu_real_host_page_size; int ret; + /* Make sure start and size are qemu_real_host_page_size aligned */ + assert(QEMU_IS_ALIGNED(start | size, psize)); + /* * We need to extend either the start or the size or both to * satisfy the KVM interface requirement. Firstly, do the start