Re: [Xen-devel] Quick Questions about page fault?

[Tim Deegan <tim@xxxxxxx>]

At 08:11 +0800 on 03 Mar (1330762314), R wrote:
> Hi everyone,
>          I want to know more about page fault. How does Xen handle
> page fault in both PV and HVM?
>          Which function will Xen call?   What is the difference?

PV: do_page_fault()
HVM with shadow pagetables: sh_page_fault() (via paging_fault())
HVM with HAP does not intercept pagefaults in the hypervisor. 

>          I assume that Xen will notify Guest OS about the page fault
> only when it needs to?

Of course. 

>          But I change the do_page_fault???? and remove the some pages' 
> _PAGE_RW.
>          I also add some code to restore the _PAGE_RW in the
> do_page_fault. If the error_code is 0, do_page_fault returen?
>          But I get some error somehow?

I'm afraid your description is too vague for anyone to understand what
the problem is.
Please read http://wiki.xen.org/wiki/AskingXenDevelQuestions before
posting again.

Tim.

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel