x86/tme: Detect if TME and MKTME is activated by BIOS

IA32_TME_ACTIVATE MSR (0x982) can be used to check if BIOS has enabled
TME and MKTME. It includes which encryption policy/algorithm is selected
for TME or available for MKTME. For MKTME, the MSR also enumerates how
many KeyIDs are available.

We would need to exclude KeyID bits from physical address bits.
detect_tme() would adjust cpuinfo_x86::x86_phys_bits accordingly.

We have to do this even if we are not going to use KeyID bits
ourself. VM guests still have to know that these bits are not usable
for physical address.

Signed-off-by: Kirill A. Shutemov <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Kai Huang <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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