From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Williamson <alex.williamson@redhat.com>
Subject: Re: the number of PCI pass-through devices limit?
Date: Mon, 26 Jan 2015 08:13:20 -0700
Message-ID: <1422285200.4048.36.camel@redhat.com>
References: <CACLBhCR7XtTWmCCyfUPkqU8vRt=o2bqe1M1tm4WwnH8-gGtR9w@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Cc: kvm@vger.kernel.org
To: Xuekun Hu <xuekun.hu@gmail.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from mx1.redhat.com ([209.132.183.28]:33496 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1754054AbbAZPNW (ORCPT <rfc822;kvm@vger.kernel.org>);
	Mon, 26 Jan 2015 10:13:22 -0500
In-Reply-To: <CACLBhCR7XtTWmCCyfUPkqU8vRt=o2bqe1M1tm4WwnH8-gGtR9w@mail.gmail.com>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

On Mon, 2015-01-26 at 16:46 +0800, Xuekun Hu wrote:
> Hi, All
> 
> Is there a limit for number of PCI pass-through devices in KVM? For
> Legacy PCI device assignement or VFIO pass-through method?

There's no enforced limit, but the usable limit is related to the number
of KVM memory slots available.  Each PCI BAR uses a memory slot
(sometimes two).  If memory slots are exhausted, the the VM aborts.
Thanks,

Alex