linux-kernel - Re: [PATCH RFC dontapply] kvm_para: add mmio word store hypercall

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Message-ID: <20120326063148.GA27952@redhat.com>
Date:	Mon, 26 Mar 2012 08:31:48 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Joerg Roedel <joerg.roedel@....com>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC dontapply] kvm_para: add mmio word store hypercall

On Sun, Mar 25, 2012 at 04:25:38PM -0700, H. Peter Anvin wrote:
> 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.

Why don't we? We emulate pci express with exact same limitations
for virtual and physical devices.

>  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.
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