Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags

(off-list ancestor, not in this archive)
Re: [PATCH 05/31] x86/mm: Reduce tlb flushes from ptep_set_access_flags() · Andi Kleen <hidden> · 2012-10-26
Re: [PATCH 05/31] x86/mm: Reduce tlb flushes from ptep_set_access_flags() · Rik van Riel <hidden> · 2012-10-26
Re: [PATCH 05/31] x86/mm: Reduce tlb flushes from ptep_set_access_flags() · Ingo Molnar <mingo@kernel.org> · 2012-10-26
Re: [PATCH 05/31] x86/mm: Reduce tlb flushes from ptep_set_access_flags() · Ingo Molnar <mingo@kernel.org> · 2012-10-26
[PATCH 3/3] mm,generic: only flush the local TLB in ptep_set_access_flags · Rik van Riel <hidden> · 2012-10-26
Re: [PATCH 3/3] mm,generic: only flush the local TLB in ptep_set_access_flags · Linus Torvalds <torvalds@linux-foundation.org> · 2012-10-26
Re: [PATCH 3/3] mm,generic: only flush the local TLB in ptep_set_access_flags · Linus Torvalds <torvalds@linux-foundation.org> · 2012-10-26
Re: [PATCH 3/3] mm,generic: only flush the local TLB in ptep_set_access_flags · Rik van Riel <hidden> · 2012-10-26
Re: [PATCH 3/3] mm,generic: only flush the local TLB in ptep_set_access_flags · Linus Torvalds <torvalds@linux-foundation.org> · 2012-10-26
[PATCH -v2 3/3] mm,generic: only flush the local TLB in ptep_set_access_flags · Rik van Riel <hidden> · 2012-10-26
[PATCH 1/3] x86/mm: only do a local TLB flush in ptep_set_access_flags() · Rik van Riel <hidden> · 2012-10-26
Re: [PATCH 1/3] x86/mm: only do a local TLB flush in ptep_set_access_flags() · Linus Torvalds <torvalds@linux-foundation.org> · 2012-10-26
Re: [PATCH 1/3] x86/mm: only do a local TLB flush in ptep_set_access_flags() · Rik van Riel <hidden> · 2012-10-26
Re: [PATCH 1/3] x86/mm: only do a local TLB flush in ptep_set_access_flags() · Linus Torvalds <torvalds@linux-foundation.org> · 2012-10-26
Re: [PATCH 1/3] x86/mm: only do a local TLB flush in ptep_set_access_flags() · Rik van Riel <hidden> · 2012-10-26
Re: [PATCH 1/3] x86/mm: only do a local TLB flush in ptep_set_access_flags() · Rik van Riel <hidden> · 2012-10-29
trailing flush_tlb_fix_spurious_fault in handle_pte_fault (was Re: [PATCH 1/3] x86/mm: only do a local TLB flush in ptep_set_access_flags()) · Vineet Gupta <hidden> · 2012-12-21
[PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Rik van Riel <hidden> · 2012-10-26
Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Alan Cox <hidden> · 2012-10-26
Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Rik van Riel <hidden> · 2012-10-27
Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Ingo Molnar <mingo@kernel.org> · 2012-10-27
Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Rik van Riel <hidden> · 2012-10-27
Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Borislav Petkov <bp@alien8.de> · 2012-10-29
Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Linus Torvalds <torvalds@linux-foundation.org> · 2012-10-29
Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Borislav Petkov <bp@alien8.de> · 2012-11-17
Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Linus Torvalds <torvalds@linux-foundation.org> · 2012-11-17
Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Borislav Petkov <bp@alien8.de> · 2012-11-17
Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Rik van Riel <hidden> · 2012-11-17
Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Shentino <hidden> · 2012-11-17
Re: [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags · Michel Lespinasse <hidden> · 2012-11-18
Re: [PATCH 05/31] x86/mm: Reduce tlb flushes from ptep_set_access_flags() · Michel Lespinasse <hidden> · 2012-10-26

From: Borislav Petkov <bp@alien8.de>
Date: 2012-11-17 14:50:00
Also in: lkml

On Mon, Oct 29, 2012 at 10:06:15AM -0700, Linus Torvalds wrote:

On Mon, Oct 29, 2012 at 9:57 AM, Borislav Petkov [off-list ref] wrote:

quoted

On current AMD64 processors,

Can you verify that this is true for older cpu's too (ie the old
pre-64-bit ones, say K6 and original Athlon)?

Albeit with a slight delay, the answer is yes: all AMD cpus
automatically invalidate cached TLB entries (and intermediate walk
results, for that matter) on a #PF.

I don't know, however, whether it would be prudent to have some sort of
a cheap assertion in the code (cheaper than INVLPG %ADDR, although on
older cpus we do MOV CR3) just in case. This should be enabled only with
DEBUG_VM on, of course...

HTH.

-- 
Regards/Gruss,
Boris.

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