Message ID | 20220719131637.46131-5-jasowang@redhat.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org> X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 7F47FC433EF for <qemu-devel@archiver.kernel.org>; Tue, 19 Jul 2022 13:25:26 +0000 (UTC) Received: from localhost ([::1]:55306 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from <qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org>) id 1oDnE5-00051e-LL for qemu-devel@archiver.kernel.org; Tue, 19 Jul 2022 09:25:25 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:40488) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <jasowang@redhat.com>) id 1oDn63-00079f-1U for qemu-devel@nongnu.org; Tue, 19 Jul 2022 09:17:07 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:60419) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <jasowang@redhat.com>) id 1oDn61-0004og-J2 for qemu-devel@nongnu.org; Tue, 19 Jul 2022 09:17:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1658236623; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2G4CfY7T1VZeOzHmVwzEz7gw1/UKh2ZTwHQxLW6ZvAw=; b=ZjpaobXgHYw+J0JG7SaC7IqTJz/spQxJujmKjBl8WM3euZY/2xH50FcKDz7gSroZx1jjCd h3+vRbcKGFsQcicupLQb8Ol6w9R7v8idmQOODPeAMHKxsQNn6h8rBQTg9YSq+WnGqBlotd LHLIjvzRzV+gafezUwUyFKxtVfa6R7o= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-177-CpCpCsJONhC2YZ1kGcYNKg-1; Tue, 19 Jul 2022 09:17:02 -0400 X-MC-Unique: CpCpCsJONhC2YZ1kGcYNKg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0569138149A7; Tue, 19 Jul 2022 13:17:02 +0000 (UTC) Received: from localhost.localdomain (ovpn-12-77.pek2.redhat.com [10.72.12.77]) by smtp.corp.redhat.com (Postfix) with ESMTP id 158DB40CFD0A; Tue, 19 Jul 2022 13:16:59 +0000 (UTC) From: Jason Wang <jasowang@redhat.com> To: qemu-devel@nongnu.org, peter.maydell@linaro.org Cc: =?utf-8?q?Eugenio_P=C3=A9rez?= <eperezma@redhat.com>, Jason Wang <jasowang@redhat.com> Subject: [PULL 04/24] vdpa: Avoid compiler to squash reads to used idx Date: Tue, 19 Jul 2022 21:16:17 +0800 Message-Id: <20220719131637.46131-5-jasowang@redhat.com> In-Reply-To: <20220719131637.46131-1-jasowang@redhat.com> References: <20220719131637.46131-1-jasowang@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Received-SPF: pass client-ip=170.10.129.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: <qemu-devel.nongnu.org> List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe> List-Archive: <https://lists.nongnu.org/archive/html/qemu-devel> List-Post: <mailto:qemu-devel@nongnu.org> List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help> List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=subscribe> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" <qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org> |
Series |
[PULL,01/24] vhost: move descriptor translation to vhost_svq_vring_write_descs
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diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c index e2184a4..560d07a 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -327,11 +327,12 @@ static void vhost_handle_guest_kick_notifier(EventNotifier *n) static bool vhost_svq_more_used(VhostShadowVirtqueue *svq) { + uint16_t *used_idx = &svq->vring.used->idx; if (svq->last_used_idx != svq->shadow_used_idx) { return true; } - svq->shadow_used_idx = cpu_to_le16(svq->vring.used->idx); + svq->shadow_used_idx = cpu_to_le16(*(volatile uint16_t *)used_idx); return svq->last_used_idx != svq->shadow_used_idx; }