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

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Date:	Sun, 25 Mar 2012 16:25:38 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Michael S. Tsirkin" <mst@...hat.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 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.

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