From: "Michael S. Tsirkin" <mst@redhat.com>
To: "H. Peter Anvin" <hpa@zytor.com>
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
Subject: Re: [PATCH RFC dontapply] kvm_para: add mmio word store hypercall
Date: Mon, 26 Mar 2012 08:31:48 +0200 [thread overview]
Message-ID: <20120326063148.GA27952@redhat.com> (raw)
In-Reply-To: <4F6FA972.9050103@zytor.com>
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.
next prev parent reply other threads:[~2012-03-26 6:31 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-25 22:05 [PATCH RFC dontapply] kvm_para: add mmio word store hypercall Michael S. Tsirkin
2012-03-25 23:25 ` H. Peter Anvin
2012-03-26 6:31 ` Michael S. Tsirkin [this message]
2012-03-26 9:21 ` Avi Kivity
2012-03-26 10:08 ` Michael S. Tsirkin
2012-03-26 10:16 ` Avi Kivity
2012-03-26 11:30 ` Michael S. Tsirkin
2012-03-26 12:11 ` Avi Kivity
2012-03-26 10:29 ` Gleb Natapov
2012-03-26 11:24 ` Michael S. Tsirkin
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