Hi Alex,
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.
BTW, this patch based on Yamahata's check memory descriptor overlap patch.
Please give comments. :)
Thanks
-Xiantao
> -----Original Message-----
> From: Alex Williamson [mailto:alex.williamson@xxxxxx]
> Sent: 2006年6月1日 10:11
> To: Zhang, Xiantao
> Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-ia64-devel] [PATCH]Fix domain0 no VGA console bug.
>
> 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.
xen0_console.patch
Description: xen0_console.patch
--- Begin Message ---
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.
>
>
> _______________________________________________
> Xen-ia64-devel mailing list
> Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-ia64-devel
>
--
yamahata
10258_e3e02e227b3e_assign_page_to_dom0_precisely.patch
Description: 10258_e3e02e227b3e_assign_page_to_dom0_precisely.patch
--- End Message ---
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