tree 403d22d33c4e050d6d30749e7a7be9a1393368a6
parent 202f9d0a41809e3424af5f61489b48b622824aed
author Matthew Garrett <mjg@redhat.com> 1304623185 -0400
committer H. Peter Anvin <hpa@linux.intel.com> 1304968479 -0700

x86, efi: Pass a minimal map to SetVirtualAddressMap()

Experimentation with various EFI implementations has shown that functions
outside runtime services will still update their pointers if
SetVirtualAddressMap() is called with memory descriptors outside the
runtime area. This is obviously insane, and therefore is unsurprising.
Evidence from instrumenting another EFI implementation suggests that it
only passes the set of descriptors covering runtime regions, so let's
avoid any problems by doing the same. Runtime descriptors are copied to
a separate memory map, and only that map is passed back to the firmware.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Link: http://lkml.kernel.org/r/1304623186-18261-4-git-send-email-mjg@redhat.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>