Re: [Xen-devel] Frame buffer mmap not working in pvops dom0

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Jul 21, 2010 at 09:47:57AM -0400, Daniel De Graaf wrote:
> I'm trying to confirm the fix to the VESA fbdev mmap issue that was
> brought up a few months ago
> (http://marc.info/?l=xen-devel&m=126842551306571&w=2). The wiki page at
> http://wiki.xensource.com/xenwiki/XenPVOPSDRM says that this bug should
> be fixed, but doesn't point to a patch for the fix. I am still able to
> reproduce the issue both on real hardware and by running Xen under qemu
> (using cirrusfb on the dom0). Eamon (the original reporter) has also not
> been able to confirm a fix.
> 
> I'm currently testing using Xen 4.1 built from hg 21831:6bebaf40e925 and
> a pvops dom0 from xen/stable-2.6.32.x revid c0a00fbe.
> 
> So far, I've been able to determine that an mmap requesting multiple
> pages from /dev/fb0 will result in page table entries all pointing to
> the same physical page, which is not in the framebuffer address space.
> Writing to the mapped page ends up corrupting parts of kernel memory.
> I'd be happy to run further tests, try patches, or provide more
> information if needed.
> 

I guess many (most?) graphics related fixes are in Konrad's git tree..

-- Pasi


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