Re: RE: [Xen-devel] confusion about the meaning of CONFIG_XEN

["Zang Hongyong" <zanghongyong@xxxxxxxxxx>]

Thanks James. 
======= 2008-07-07 17:42:45 您在来信中写道：=======

>CONFIG_XEN is defined when building a PV kernel, and undefined when building 
>PV drivers for an 'unmodified' (non-PV) kernel.
In other words, undefined occurs only in PV driver for HVM.
>Platform-pci is a device driver which interfaces with xen on a non-PV kernel, 
>via a virtual PCI device provided by qemu.
And Platform-pci is only for PV driver of HVM.
Is my understanding right?
>James
>
>-----Original Message-----
>From: "Zang Hongyong"<zanghongyong@xxxxxxxxxx>
>Sent: 7/07/08 5:59:14 PM
>To: "xen-devel"<xen-devel@xxxxxxxxxxxxxxxxxxx>
>Subject: [Xen-devel] confusion about the meaning of CONFIG_XEN
>
>hi all,
>  I noticed "CONFIG_XEN" appears many times in Xen source code. I'm confused 
> about the meaning of "CONFIG_XEN".
>  For example, 
>    in "gnttab.c", the definations of gnttab_map() and gnttab_resume() vary 
> with "ifdef CONFIG_XEN" or not.
>    And I also noticed ifndef CONFIG_XEN , the file <platform-pci.h> is 
> included.
>
>  So my questions are
>  1)What's the meanning of CONFIG_XEN?  and on which kind of conditions, 
> CONFIG_XEN should not be defined?
>  2)What is platform-pci for?
>
>  Any advice would be welcome.
>
>Thanks in advance.   
>
>Zang Hongyong
>zanghongyong@xxxxxxxxxx
>2008-07-07
>
>
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= = = = = = = = = = = = = = = = = = = =
Zang Hongyong
zanghongyong@xxxxxxxxxx
2008-07-07

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