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

To: xen-devel@xxxxxxxxxxxxxxxxxxx
From: Wei Kong <weikong.cn@xxxxxxxxx>
Date: Tue, 10 Nov 2009 12:48:39 +0800
Delivery-date: Mon, 09 Nov 2009 20:49:02 -0800
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List-id: Xen developer discussion <xen-devel.lists.xensource.com>

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 direct_remap_pfn_range().

--thank you
Kong

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