Thomas Gleixner d8f0b35331
x86/cpu: Uninline CR4 accessors ...
cpu_tlbstate is exported because various TLB-related functions need
access to it, but cpu_tlbstate is sensitive information which should
only be accessed by well-contained kernel functions and not be directly
exposed to modules.
The various CR4 accessors require cpu_tlbstate as the CR4 shadow cache
is located there.
In preparation for unexporting cpu_tlbstate, create a builtin function
for manipulating CR4 and rework the various helpers to use it.
No functional change.
[ bp: push the export of native_write_cr4() only when CONFIG_LKTDM=m to
the last patch in the series. ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de >
Signed-off-by: Borislav Petkov <bp@suse.de >
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com >
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org >
Link: https://lkml.kernel.org/r/20200421092558.939985695@linutronix.de
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