KVM: x86/mmu: rename and clarify BYTE_MASK
The BYTE_MASK macro is the central point of the black magic
in update_permission_bitmask(). Rename it to something
that relates to how it is used, and add a comment explaining
how it works.
Using shifts instead of powers of two was actually suggested by
David Hildenbrand back in 2017 for clarity[1] but I evidently
forgot his suggestion when applying to kvm.git.
[1] https://lore.kernel.org/kvm/
e4b5df86-31ae-2f4e-0666-
393753e256df@redhat.com/
Tested-by: David Riley <d.riley@proxmox.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
projects / linux / commit