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Stanislav Shwartsman eda28b95f4 unfortunately this change is rquired to make SMAP and SMEP features to work.
I observed ~5% emulation slowdown ... thinking about possible mitigations

this fixes TLB issue with SMAP and SMEP features.
these features introduce a new behavior when page can be inaccessible by System (CPL=0).
Current behavior is accessBits was not supporting it but legacy (from Bochs 2.3.6) was.
The wrong behavior can be observed if user access a user page and system access the same page later.
user access is fine and pass SMEP/SMA checks and stores the translation in TLB.
the system access will hit the TLB and nobody could detect that system cannot access that page.
2013-01-16 17:28:20 +00:00
bochs unfortunately this change is rquired to make SMAP and SMEP features to work. 2013-01-16 17:28:20 +00:00
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