Messages in this thread | | | Date | Thu, 2 Nov 2017 12:53:19 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH] x86/mm: Remove unneeded TLB flush for in-place encryption |
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On Wed, Nov 01, 2017 at 11:54:26AM -0500, Tom Lendacky wrote: > 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> > --- > 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 16c5f37..53680a9 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(); > > /*
Reviewed-by: Borislav Petkov <bp@suse.de>
-- Regards/Gruss, Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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