RE: Resend [Xen-ia64-devel] [PATCH]Fix domain0 no VGA console bug.

["Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>]

OK, the logic seems more clear. It should be fine with our platforms. :)
Thanks & Best Regards
-Xiantao

OTC,Intel Corporation

> -----Original Message-----
> From: Alex Williamson [mailto:alex.williamson@xxxxxx]
> Sent: 2006年6月5日 0:50
> To: Zhang, Xiantao
> Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: Resend [Xen-ia64-devel] [PATCH]Fix domain0 no VGA console bug.
> 
> On Sun, 2006-06-04 at 21:16 +0800, Zhang, Xiantao wrote:
> >     The updated patch should be happy for all platforms. If EFI doesn't
> > provide md for range(0xa0000-0xc0000) to OS. It maybe a hole or
> > occupied by legacy vga.  Therefore, I used the efi_mmio function to
> > check it. If these pages was not mapped yet and efi_mmio return true,
> > we can map them as MMIO safely.
> 
> Hi Xiantao,
> 
>    This patch has a couple problems.  First, if a page is mapped, as
> indicated by domain_page_mapped(), it shouldn't fall into the else and
> get mapped again.  Second, I believe domain_page_mapped() should use
> lookup_noalloc_domain_pte() instead of the alloc version.
> 
>    I've updated the patch and expanded on it a little to create
> conventional memory ranges in low memory corresponding to the ranges the
> platform provides.  This prevents my non-VGA system from improperly
> detecting a VGA console and reclaims that little bit of memory in it's
> address space.  Please let me know if this attached patch works for you
> as well.  Thanks,
> 
>       Alex
> 
> --
> Alex Williamson                             HP Open Source & Linux Org.

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