x86/speculation: Add basic IBPB (Indirect Branch Prediction Barrier) support

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Expose indirect_branch_prediction_barrier() for use in subsequent patches.

[ tglx: Add IBPB status to spectre_v2 sysfs file ]

Co-developed-by: KarimAllah Ahmed <karahmed@amazon.de>
Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Cc: gnomes@lxorguk.ukuu.org.uk
Cc: ak@linux.intel.com
Cc: ashok.raj@intel.com
Cc: dave.hansen@intel.com
Cc: arjan@linux.intel.com
Cc: torvalds@linux-foundation.org
Cc: peterz@infradead.org
Cc: bp@alien8.de
Cc: pbonzini@redhat.com
Cc: tim.c.chen@linux.intel.com
Cc: gregkh@linux-foundation.org
Link: https://lkml.kernel.org/r/1516896855-7642-8-git-send-email-dwmw@amazon.co.uk

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David Woodhouse 2018-01-25 16:14:15 +00:00 • committed by Thomas Gleixner

parent a5b2966364

commit 20ffa1caec

3 changed files with 24 additions and 1 deletions

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2

arch/x86/include/asm/cpufeatures.h

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13

arch/x86/include/asm/nospec-branch.h

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10

arch/x86/kernel/cpu/bugs.c

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