From patchwork Tue Mar 2 10:51:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 12111745 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9977C43331 for ; Tue, 2 Mar 2021 16:07:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE77E64F14 for ; Tue, 2 Mar 2021 16:07:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1448986AbhCBQCk (ORCPT ); Tue, 2 Mar 2021 11:02:40 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:57826 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1446400AbhCBKxf (ORCPT ); Tue, 2 Mar 2021 05:53:35 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1614682329; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc; bh=SzDKxvBAv6SXm+NUCcAJGjMwV47OKoU6w1l5j4zzOVo=; b=bFplR3L+WReDDuYfzMEkYBTxZ8sYubmlCXKDqQr5AudKtgRwwXZ+fo8j+ykFpWpsnC1xHk sFkCT4VquZ/JEidrinOtSNR2H0VFKqgFAGLjnfkpD3ABXUvv5xYyd2a8KrtK+FcvkupAnf evpNreVwGVJRotoJsXdc/5XlG+RytC8= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-397-3gRwmn9WOriegQZm-MSt6g-1; Tue, 02 Mar 2021 05:52:08 -0500 X-MC-Unique: 3gRwmn9WOriegQZm-MSt6g-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E8C4B107ACF3; Tue, 2 Mar 2021 10:52:06 +0000 (UTC) Received: from hp-dl380pg8-01.lab.eng.pek2.redhat.com (hp-dl380pg8-01.lab.eng.pek2.redhat.com [10.73.8.10]) by smtp.corp.redhat.com (Postfix) with ESMTP id C239E6F973; Tue, 2 Mar 2021 10:52:00 +0000 (UTC) From: Jason Wang To: mst@redhat.com, jasowang@redhat.com, kvm@vger.kernel.org Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH V2] vhost-vdpa: honor CAP_IPC_LOCK Date: Tue, 2 Mar 2021 05:51:58 -0500 Message-Id: <20210302105158.8240-1-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org When CAP_IPC_LOCK is set we should not check locked memory against rlimit as what has been implemented in mlock() and documented in Documentation/admin-guide/perf-security.rst: " RLIMIT_MEMLOCK and perf_event_mlock_kb resource constraints are ignored for processes with the CAP_IPC_LOCK capability. " Fixes: 4c8cf31885f6 ("vhost: introduce vDPA-based backend") Signed-off-by: Jason Wang --- drivers/vhost/vdpa.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index ef688c8c0e0e..e93572e2e344 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -638,7 +638,8 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, mmap_read_lock(dev->mm); lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; - if (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit) { + if (!capable(CAP_IPC_LOCK) && + (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit)) { ret = -ENOMEM; goto unlock; }