x86/platform/UV: Bring back the call to map_low_mmrs in uv_system_init
A while back the following commit: d394f2d9 ("x86/platform/UV: Remove EFI memmap quirk for UV2+") changed uv_system_init() to only call map_low_mmrs() on older UV1 hardware, which requires EFI_OLD_MEMMAP to be set in order to boot. The recent changes to the EFI memory mapping code in: d2f7cbe7 ("x86/efi: Runtime services virtual mapping") exposed some issues with the fact that we were relying on the EFI memory mapping mechanisms to map in our MMRs for us, after commit d394f2d9 . Rather than revert the entire commit and go back to forcing EFI_OLD_MEMMAP on all UVs, we're going to add the call to map_low_mmrs() back into uv_system_init(), and then fix up our EFI runtime calls to use the appropriate page table. For now, UV2+ will still need efi=old_map to boot, but there will be other changes soon that should eliminate the need for this. Signed-off-by: Alex Thorlton <athorlton@sgi.com> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Adam Buchbinder <adam.buchbinder@gmail.com> Cc: Len Brown <len.brown@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: Russ Anderson <rja@sgi.com> Cc: Dimitri Sivanich <sivanich@sgi.com> Link: http://lkml.kernel.org/r/1462401592-120735-1-git-send-email-athorlton@sgi.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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