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x86/tlb: Move __flush_tlb() out of line

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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.

As a first step, move __flush_tlb() out of line and hide the native
function. The latter can be static when CONFIG_PARAVIRT is disabled.

Consolidate the namespace while at it and remove the pointless extra
wrapper in the paravirt code.

No functional change.

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/20200421092559.246130908@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-04-21 11:20:32 +02:00
committed by Borislav Petkov
parent 9020d39563
commit 2faf153bb7
7 changed files with 45 additions and 36 deletions
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4
arch/x86/include/asm/paravirt.h
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@@ -47,7 +47,9 @@ static inline void slow_down_io(void)
#endif
}
static inline void __flush_tlb(void)
void native_flush_tlb_local(void);
static inline void __flush_tlb_local(void)
{
PVOP_VCALL0(mmu.flush_tlb_user);
}