From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH RFC dontapply] kvm_para: add mmio word store hypercall
Date: Sun, 25 Mar 2012 16:25:38 -0700
Message-ID: <4F6FA972.9050103@zytor.com>
References: <20120325220518.GA27879@redhat.com>
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Cc: Joerg Roedel <joerg.roedel@amd.com>, Avi Kivity <avi@redhat.com>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
To: "Michael S. Tsirkin" <mst@redhat.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <20120325220518.GA27879@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

On 03/25/2012 03:05 PM, Michael S. Tsirkin wrote:
> We face a dilemma: IO mapped addresses are legacy,
> so, for example, PCI express bridges waste 4K
> of this space for each link, in effect limiting us
> to 16 devices using this space.

That is *only* if they are physical devices on PCIe links.  For virtual
devices you have no such limitation.  What is the problem again?

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.