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Re: [Xen-devel] VM_FOREIGN could be set into direct_remap_pfn_range()?

To: "Wei Kong" <weikong.cn@xxxxxxxxx>
Subject: Re: [Xen-devel] VM_FOREIGN could be set into direct_remap_pfn_range()?
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Tue, 10 Nov 2009 10:44:00 +0000
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>>> Wei Kong <weikong.cn@xxxxxxxxx> 10.11.09 05:48 >>>
>Now we encounter a EFAULT in get_user_pages() when xm save on old
>ocfs2-1.4.1 fs.
>Due to in xc_domain_save got VM_IO when mmap and IOCTL_PRIVCMD_MMAPBATCH,
>but not VM_FOREIGN,
>but old ocfs2-1.4.1 has get_user_pages() when do write.
>I don't know is there any side effect if I set VM_FOREIGN for vm_flags in

Yes - VM_FOREIGN implies that vma->vm_private_data points to an array
of struct page *, providing the pages for the vma.


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