From patchwork Wed Jun 28 06:59:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cindy Lu X-Patchwork-Id: 13295322 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44894EB64D7 for ; Wed, 28 Jun 2023 08:04:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231526AbjF1IEc (ORCPT ); Wed, 28 Jun 2023 04:04:32 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:50996 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232152AbjF1IBG (ORCPT ); Wed, 28 Jun 2023 04:01:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1687939215; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Vm8YdVuG5g/R4Upgn7ExptiiekTMB39MDE6nGXwwg5I=; b=F1Bx07nzPaIkb6j4fA2DPfBTkV4xpbMkEt6ECFntR5Q5YO0CI/AmgOxgfGtDag+yO9MThn BmRjs/6o0JjArkN3gnwuIbQsphEDuMK88xVdR+B69EEHrSEtiIybN7u+H8A7ba5Pn5FRHR 6XBRG8t+k1YNrM1UW4ja6kPlPg08Dt8= 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-115-wEAlpELWNdCfebbpAG2Kmg-1; Wed, 28 Jun 2023 02:59:39 -0400 X-MC-Unique: wEAlpELWNdCfebbpAG2Kmg-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 379003C025C7; Wed, 28 Jun 2023 06:59:39 +0000 (UTC) Received: from server.redhat.com (ovpn-13-142.pek2.redhat.com [10.72.13.142]) by smtp.corp.redhat.com (Postfix) with ESMTP id A62E0492B02; Wed, 28 Jun 2023 06:59:35 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com, maxime.coquelin@redhat.com, xieyongji@bytedance.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Subject: [RFC 3/4] vduse: Add the function for get/free the mapp pages Date: Wed, 28 Jun 2023 14:59:18 +0800 Message-Id: <20230628065919.54042-4-lulu@redhat.com> In-Reply-To: <20230628065919.54042-1-lulu@redhat.com> References: <20230628065919.54042-1-lulu@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Your Name Add the function for get/free pages, ad this info will saved in dev->reconnect_info Signed-off-by: Cindy Lu --- drivers/vdpa/vdpa_user/vduse_dev.c | 35 ++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index 1b833bf0ae37..3df1256eccb4 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -1313,6 +1313,35 @@ static struct vduse_dev *vduse_dev_get_from_minor(int minor) return dev; } +int vduse_get_vq_reconnnect(struct vduse_dev *dev, u16 idx) +{ + struct vdpa_reconnect_info *area; + void *addr = (void *)get_zeroed_page(GFP_KERNEL); + + area = &dev->reconnect_info[idx]; + + area->addr = virt_to_phys(addr); + area->vaddr = (unsigned long)addr; + area->size = PAGE_SIZE; + area->index = idx; + + return 0; +} + +int vduse_free_vq_reconnnect(struct vduse_dev *dev, u16 idx) +{ + struct vdpa_reconnect_info *area; + + area = &dev->reconnect_info[idx]; + if ((area->size == PAGE_SIZE) && (area->addr != NULL)) { + free_page(area->vaddr); + area->size = 0; + area->addr = 0; + area->vaddr = 0; + } + + return 0; +} static vm_fault_t vduse_vm_fault(struct vm_fault *vmf) { @@ -1446,6 +1475,10 @@ static int vduse_destroy_dev(char *name) mutex_unlock(&dev->lock); return -EBUSY; } + for (int i = 0; i < dev->vq_num; i++) { + + vduse_free_vq_reconnnect(dev, i); + } dev->connected = true; mutex_unlock(&dev->lock); @@ -1583,6 +1616,8 @@ static int vduse_create_dev(struct vduse_dev_config *config, INIT_WORK(&dev->vqs[i].kick, vduse_vq_kick_work); spin_lock_init(&dev->vqs[i].kick_lock); spin_lock_init(&dev->vqs[i].irq_lock); + + vduse_get_vq_reconnnect(dev, i); } ret = idr_alloc(&vduse_idr, dev, 1, VDUSE_DEV_MAX, GFP_KERNEL);