KVM: VMX: Drop TDX_SHARED_BIT_PWL_{4,5} and dedup related code

Fold the GPA => GFN conversion and bitshift logic for identifying the S-bit
given the EPT root level into tdx_set_mirror_root_level() to dedup the math
and drop TDX_SHARED_BIT_PWL_{4,5} in the process.  In addition to deduping
a small amount of code, using the level to compute the S-bit position more
or less eliminates the risk of the mirror_root_level and gfn_direct_bits
getting out of sync.

Opportunistically switch the sanity check in tdx_load_mmu_pgd() to check
the mirror root level, not the S-Bit location, now that it's all but
impossible for the two things to get out of sync.

For all intents and purposes, no functional change intended.

Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://patch.msgid.link/20260902230932.2760127-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

0 files changed, 0 insertions, 0 deletions