From: "H. Peter Anvin" <hpa@zytor.com>
To: "Michael S. Tsirkin" <mst@redhat.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: Sun, 25 Mar 2012 16:25:38 -0700 [thread overview]
Message-ID: <4F6FA972.9050103@zytor.com> (raw)
In-Reply-To: <20120325220518.GA27879@redhat.com>
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.
next prev parent reply other threads:[~2012-03-25 23:25 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 [this message]
2012-03-26 6:31 ` Michael S. Tsirkin
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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