From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 CAB1DC43461 for ; Wed, 16 Sep 2020 10:02:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6C3BD2076B for ; Wed, 16 Sep 2020 10:02:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="RE5vF2dU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726802AbgIPKB4 (ORCPT ); Wed, 16 Sep 2020 06:01:56 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:47618 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726781AbgIPKBY (ORCPT ); Wed, 16 Sep 2020 06:01:24 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600250483; 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=b+BtD94FO8ZoxunpXlbSATsg5yugE548JCHe/T+26L4=; b=RE5vF2dUduubdzxrc+zaiG3kWWbdzr1WD1g9rAvLObtY1qENrPUMRRGK/Z2jqKZiWTkKyN 2Aore36Rko9WSXEZ3MbmE5DkwHxLdqFplvk98tQQXQf3kow8oPbcFRkJVDMvqWhQgRJp3Z IIIqPvM4xkWJJnCNqODbCOe25/RC2QI= 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-203-i8KH1gPENEiL-uHX4p442Q-1; Wed, 16 Sep 2020 06:01:19 -0400 X-MC-Unique: i8KH1gPENEiL-uHX4p442Q-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B5A19EA323; Wed, 16 Sep 2020 10:01:17 +0000 (UTC) Received: from gondolin (ovpn-112-252.ams2.redhat.com [10.36.112.252]) by smtp.corp.redhat.com (Postfix) with ESMTP id EBA2B75123; Wed, 16 Sep 2020 10:01:14 +0000 (UTC) Date: Wed, 16 Sep 2020 12:01:12 +0200 From: Cornelia Huck To: Matthew Rosato Cc: alex.williamson@redhat.com, pmorel@linux.ibm.com, schnelle@linux.ibm.com, rth@twiddle.net, david@redhat.com, thuth@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, mst@redhat.com, pbonzini@redhat.com, qemu-s390x@nongnu.org, qemu-devel@nongnu.org, kvm@vger.kernel.org Subject: Re: [PATCH v3 3/5] vfio: Find DMA available capability Message-ID: <20200916120112.53604f46.cohuck@redhat.com> In-Reply-To: <1600197283-25274-4-git-send-email-mjrosato@linux.ibm.com> References: <1600197283-25274-1-git-send-email-mjrosato@linux.ibm.com> <1600197283-25274-4-git-send-email-mjrosato@linux.ibm.com> Organization: Red Hat GmbH MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Tue, 15 Sep 2020 15:14:41 -0400 Matthew Rosato wrote: > The underlying host may be limiting the number of outstanding DMA > requests for type 1 IOMMU. Add helper functions to check for the > DMA available capability and retrieve the current number of DMA > mappings allowed. > > Signed-off-by: Matthew Rosato > --- > hw/vfio/common.c | 31 +++++++++++++++++++++++++++++++ > include/hw/vfio/vfio-common.h | 2 ++ > 2 files changed, 33 insertions(+) Reviewed-by: Cornelia Huck