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dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:54526 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kIUHn-0004ix-8k for qemu-devel@archiver.kernel.org; Wed, 16 Sep 2020 06:03:35 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55902) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kIUFf-00029r-QY for qemu-devel@nongnu.org; Wed, 16 Sep 2020 06:01:24 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:27754) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kIUFd-0001rh-VC for qemu-devel@nongnu.org; Wed, 16 Sep 2020 06:01:23 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600250481; 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=hHa2QsfXVqHCXXpbYNJ4fPTK4O443gURiNqylyGE1HMJnl+SqHHbQg0KITkUSXNCixrbxZ wjbwcmgYCjJ+Dcv2Sz43/njaDLm+7C+XrIRlFnk9ya/tUR0xFQ7mWPm6MwXOATJ7XNy8eP A4nmKer+69wmhvIkwTmCbofHgm+zwgU= 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 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 Received-SPF: pass client-ip=216.205.24.124; envelope-from=cohuck@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/16 02:16:02 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -50 X-Spam_score: -5.1 X-Spam_bar: ----- X-Spam_report: (-5.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.999, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=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: thuth@redhat.com, kvm@vger.kernel.org, pmorel@linux.ibm.com, david@redhat.com, schnelle@linux.ibm.com, qemu-s390x@nongnu.org, qemu-devel@nongnu.org, pasic@linux.ibm.com, borntraeger@de.ibm.com, alex.williamson@redhat.com, mst@redhat.com, pbonzini@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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