From b42d32d4de47bbadfcec379e29ad58f6cb0758e5 Mon Sep 17 00:00:00 2001 From: Tom Lendacky Date: Wed, 1 Nov 2017 11:54:26 -0500 Subject: [PATCH] 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 Signed-off-by: Tom Lendacky Reviewed-by: Borislav Petkov Cc: Borislav Petkov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/20171101165426.1388.24866.stgit@tlendack-t1.amdoffice.net Signed-off-by: Ingo Molnar --- arch/x86/mm/mem_encrypt.c | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c index 16c5f37933a2a..53680a9dfbedb 100644 --- a/arch/x86/mm/mem_encrypt.c +++ b/arch/x86/mm/mem_encrypt.c @@ -63,7 +63,6 @@ static void __init __sme_early_enc_dec(resource_size_t paddr, if (!sme_me_mask) return; - local_flush_tlb(); wbinvd(); /* -- 2.39.5