UefiCpuPkg: Find top SMBASE tile by physical address

PatchSmmSaveStateMap() applies the extended 32KB data tail to the final
SmBase[] entry, assuming that the array is ordered by physical address

SMM_BASE_HOB_DATA indexes SmBase[] by processor index and does not
require a physical address order. A valid producer can therefore supply
a descending SMBASE layout. In that case, extending the data range from
the final array element overlaps SMI entry code in higher physical
tiles and marks it non-executable.

Find the SMBASE tile with the highest physical address and apply the
extended data tail only to that tile. Existing ascending layouts do not
change their current behavior

Signed-off-by: Aleksandr Goncharov <chat@joursoir.net>

0 files changed, 0 insertions, 0 deletions