From: Tim Deegan <tim@xen.org>
To: R <19890121wr@gmail.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: Quick Questions about page fault?
Date: Mon, 5 Mar 2012 12:29:25 +0000 [thread overview]
Message-ID: <20120305122925.GA3065@ocelot.phlegethon.org> (raw)
In-Reply-To: <CAF2sySMu-Uatrw85WmgyD=3Jwx+Zu4Vb8S3edGA1BawoXzHb9A@mail.gmail.com>
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.
prev parent reply other threads:[~2012-03-05 12:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-03 0:11 Quick Questions about page fault? R
2012-03-05 12:29 ` Tim Deegan [this message]
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