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x86/mm: Remove unnecessary TLB flush for SME in-place encryption 

A TLB flush is not required when doing in-place encryption or decryption
since the area's pagetable attributes are not being altered.  To avoid
confusion between what the routine is doing and what is documented in
the AMD APM, delete the local_flush_tlb() call.

Suggested-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20171101165426.1388.24866.stgit@tlendack-t1.amdoffice.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Tom Lendacky 2017-11-01 11:54:26 -05:00 committed by Ingo Molnar
parent 629a359bdb
commit c5e260890d
1 changed files with 0 additions and 1 deletions
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arch/x86/mm/mem_encrypt.c
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@ -63,7 +63,6 @@ static void __init __sme_early_enc_dec(resource_size_t paddr,
if (!sme_me_mask) if (!sme_me_mask)
return; return;
local_flush_tlb();
wbinvd(); wbinvd();
/* /*