RE: [Xen-devel] Userspace PIO access under xen

To:	"Michael S. Tsirkin" <mst@xxxxxxxxxxxxxx>, "Dror Goldenberg" <gdror@xxxxxxxxxxxxxx>
Subject:	RE: [Xen-devel] Userspace PIO access under xen
From:	"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date:	Mon, 25 Jul 2005 12:56:56 +0100
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Thread-topic:	[Xen-devel] Userspace PIO access under xen

 

> The following simple program (below) mmaps PCI I/O memory 
> into userspace. This works fine under linux, but not in Xen dom0.
> 
> Linux:
> 
> # ./test1 /sys/bus/pci/devices/0000\:07\:00.0/resource0 0 0 0
> 
> Xen dom0:
> 
> # ./test1 /sys/bus/pci/devices/0000\:07\:00.0/resource0 0 0 0xf000eef3


Interesting -- I didn't know you could use /sys/bus/pci/devices/ for
mapping memory.

Change pci_mmap_page_range in arch/xen/arch/pci/i386.c to use
io_remap_pfn_range

I'll check something in.

Ian


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RE: [Xen-devel] Userspace PIO access under xen