[PATCH] check memory descriptor over lap in dom_fw_init() (was Re: [Xen-ia64-devel] [PATCH]Fix domain0 no VGA console bug.)

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

This patch tries to check MD's overlap and tries not to assign
page to non conventional area.
Maybe you may want to apply this patch before VGA-related modifications.

On Wed, May 31, 2006 at 08:10:42PM -0600, Alex Williamson wrote:
> On Thu, 2006-06-01 at 09:45 +0800, Zhang, Xiantao wrote:
> > Hi Alex,
> >     We are using tiger4 platform. I didn't find md about space:
> > 0xa0000-0xc0000 in efi memmap, maybe it was assumed
> > EFI_MEMORY_MAPPED_IO in native OS. But dom_fw_init shouldn't neglect
> > it to set IO space according to MDs efi provides. Seems your platform
> > has VGA console. So this patch can enable VGA console on all platforms
> > explicitly, maybe as you said this step is better to do in
> > dom_fw_init :)
> 
> Hi Xiantao,
> 
>    One of my test systems has VGA, the other does not.  We cannot assume
> VGA in the system.  If the MDT on the tiger4 doesn't describe that
> range, then we probably need to at least revert to the test the Linux
> kernel uses and test whether that range has a WB memory attribute before
> assuming it's VGA.  Also, try not to double map the range for platforms
> that do describe this as type EFI_MEMORY_MAPPED_IO.  Thanks,
> 
>       Alex
> 
> -- 
> Alex Williamson                             HP Open Source & Linux Org.
> 
> 
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-- 
yamahata

Attachment: 10258:e3e02e227b3e_assign_page_to_dom0_precisely.patch
Description: Text document

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