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Re: [Xen-devel] Kernel Oops when reading kernel_page_tables debugfs file
| To: | Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Kernel Oops when reading kernel_page_tables debugfs file |
| From: | Vivien Bernet-Rollande <vbernetr@xxxxxxxxx> |
| Date: | Tue, 30 Nov 2010 10:34:07 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 30 Nov 2010 02:51:40 -0800 |
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On Mon, Nov 29, 2010 at 4:20 PM, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote: > On Wed, Nov 24, 2010 at 05:07:49PM +0100, Vivien Bernet-Rollande wrote: >> Hi list. >> I'm currently trying to get a device driver to work on Xen dom0. The driver >> maps PCI space to userland, and for some reason I have yet to figure, it >> doesn't work. > > Did you set VM_IO on your mapping? > The driver doesn't set the VM_IO flag itself. However, it calls io_remap_pfn_range(), which is a macro wrapper around remap_pfn_range(). The later does : vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP; So the VM_IO flag is set. I actually corrected the bug by adding the _PAGE_IOMAP flag in the vma->vm_pgprot. Shouldn't remap_pfn_range() set that flag if VM_IO is set ? _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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