On Wed, Jul 11, 2018 at 07:58:09AM -0700, Yu-cheng Yu wrote:

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

quoted

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?

Yes, since we also use the in-kernel decoder to decode random userspace
code.