SpecuCheck v1.0.4 -- Copyright(c) 2018 Alex Ionescu
https://ionescu007.github.io/SpecuCheck/ -- @aionescu
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Mitigations for CVE-2017-5754 [rogue data cache load]
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[-] Kernel VA Shadowing Enabled: yes
├───> with User Pages Marked Global: yes
└───> with PCID Flushing Optimization (INVPCID): no
Your system either does not have the appropriate patch, or it may not support the information class required.
SpecuCheck v1.0.2 -- Copyright (c) 2018 Alex Ionescu
http://www.alex-ionescu.com - @aionescu
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Mitigations for CVE-2017-5754 [rogue data cache load]
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Kernel VA Shadowing Enabled: yes
Kernel VA Shadowing with User Pages Marked Global: yes
Kernel VA Shadowing with PCID Support: no
Kernel VA Shadowing with INVPCID Support: no
Mitigations for CVE-2017-5715 [branch target injection]
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Branch Prediction Mitigations Enabled: no
Branch Prediction Mitigations Disabled due to System Policy: no
Branch Prediction Mitigations Disabled due to No Hardware Support: yes
CPU Supports Speculation Controls: no
CPU Supports Speculation Commands: no
IBRS Speculation Control Present: no
STIBP Speculation Command Present: no
Supervisor Mode Execution Prevention Present: no
(The CPU is i5-2300, which supports PCID without INVPCID, and does not have the required microcode update,)
The release notes for 1.0.3 say "the WoW64 subsystem supports this system call"; apparently this is not the case at least for Windows 10 version 1703.