WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Xen
Home Products Support Community News

xen-devel

[Top] [All Lists]
<prev [Date] next>
[Advanced]
<prev [Thread] next>

RE: [Xen-devel] About IO

from [Guy Zana] [Permanent Link][Original]
To: "Liu, Huahang" <huahang.liu@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] About IO
From: "Guy Zana" <guy@xxxxxxxxxxxx>
Date: 2007年3月30日 04:01:31 -0400
Delivery-date: 2007年3月30日 09:05:41 +0100
Envelope-to: Keir.Fraser@xxxxxxxxxxxx
In-reply-to: <991B62EB36934C4EBD5B605518A724764C421E@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcdyeZanoNJ6aPq6SKS+5oY9VtNsoAAAcRKAAAkKPyA=
Thread-topic: [Xen-devel] About IO
When a guest access a pseudo physical memory address, the hypervisor tries to translate it to the equivalent machine address (real memory). If the address does not exist in the guets's P2M (physical to machine) translation then it is considered to be mmio, in this case, a ioctl_t struct representing that access is being built and sent to the device model of the HVM guest in domain0, there it is handled by the emulated hardware.
Non-prefetchable MMIO (buffered) regions are being mapped to the guest's memory layout and they actually a part of it.
Since it is not prefetchable, a buffered mmio region is also mapped to the device model and being accessed "randomly", preformance is better this way.
Thanks,
Guy.

From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Liu, Huahang
Sent: Friday, March 30, 2007 6:28 AM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] About IO

What is the MMIO address space of Xen HVM?

What happen when I read from or write to these IO ports?

Thanks,

Huahang

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
[More with this subject...]
<Prev in Thread] Current Thread [Next in Thread>
Previous by Date: [Xen-devel] Triggering hotplug scripts multiple times , Jacob Gorm Hansen
Next by Date: Re: [Xen-devel] Triggering hotplug scripts multiple times , Keir Fraser
Previous by Thread: RE: [Xen-devel] About IO , Li, Xin B
Next by Thread: [Xen-devel] Triggering hotplug scripts multiple times , Jacob Gorm Hansen
Indexes: [Date] [Thread] [Top] [All Lists]

Copyright ©, Citrix Systems Inc. All rights reserved. Legal and Privacy
Citrix This site is hosted by Citrix

AltStyle によって変換されたページ (->オリジナル) /