Re: [RFC PATCH v2 18/27] x86/cet/shstk: Introduce WRUSS instruction

On Wed, 2018-07-11 at 11:45 +0200, Peter Zijlstra wrote:

On Tue, Jul 10, 2018 at 03:26:30PM -0700, Yu-cheng Yu wrote:

quoted

diff --git a/arch/x86/lib/x86-opcode-map.txt b/arch/x86/lib/x86-

opcode-map.txt
index e0b85930dd77..72bb7c48a7df 100644

--- a/arch/x86/lib/x86-opcode-map.txt
+++ b/arch/x86/lib/x86-opcode-map.txt

@@ -789,7 +789,7 @@ f0: MOVBE Gy,My | MOVBE Gw,Mw (66) | CRC32

Gd,Eb (F2) | CRC32 Gd,Eb (66&F2)
 f1: MOVBE My,Gy | MOVBE Mw,Gw (66) | CRC32 Gd,Ey (F2) | CRC32
Gd,Ew (66&F2)
 f2: ANDN Gy,By,Ey (v)
 f3: Grp17 (1A)
-f5: BZHI Gy,Ey,By (v) | PEXT Gy,By,Ey (F3),(v) | PDEP Gy,By,Ey
(F2),(v)
+f5: BZHI Gy,Ey,By (v) | PEXT Gy,By,Ey (F3),(v) | PDEP Gy,By,Ey
(F2),(v) | WRUSS Pq,Qq (66),REX.W
 f6: ADCX Gy,Ey (66) | ADOX Gy,Ey (F3) | MULX By,Gy,rDX,Ey (F2),(v)
 f7: BEXTR Gy,Ey,By (v) | SHLX Gy,Ey,By (66),(v) | SARX Gy,Ey,By
(F3),(v) | SHRX Gy,Ey,By (F2),(v)
 EndTable

Where are all the other instructions? ISTR that documentation patch
listing a whole bunch of new instructions, not just wuss.

Currently we only use WRUSS in the kernel code.  Do we want to add all
instructions here?

Yu-cheng