Re: [Xen-devel] How to read/write a file inside xen

[Johnny R <xen4wr@xxxxxxxxx>]

I want to do file operation inside the hypervisor.Seems like there is no file mechanism implemented inside hypervisor.So if i want to pull this,say i need to some info of a page,i need to map this page,and give the pointer that point to the start of this page to dom0.Finally let dom0 write the file for me?

在 2011年7月9日 下午11:38，Johnny R <xen4wr@xxxxxxxxx>写道：

inside hypervisor so if i want to do file operation inside the hypervisor i need to map a memory in dom0,and then do the rest work in dom0?

2011/7/9 John Liu <bradevuu@xxxxxxxxx>

You mean do file operation in dom0? or inside hypervisor.   

xen just give the Guest OS the privilege to write directly to disk.

-- I got a little confused. Why need special privilege for write on disk? as long as PTE permission is ok.



于 2011/7/9 11:04, Johnny R 写道:

  I tried to write a file inside xen during hypercall or do_page_fault,but I find out that I can not use linux kernel code to acomplish this.After searching in the xen's source code,I find  not clue of xen itself using any file operation,which confuse me.So i want to ask how to write/read a file inside xen,and how xen swap out a page or xen just give the Guest OS the privilege to write directly to disk.

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