x86/speculation: Simplify indirect_branch_prediction_barrier()

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Make it all a function which does the WRMSR instead of having a hairy
inline asm.

[dwmw2: export it, fix CONFIG_RETPOLINE issues]

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: ak@linux.intel.com
Cc: dave.hansen@intel.com
Cc: karahmed@amazon.de
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/1517070274-12128-4-git-send-email-dwmw@amazon.co.uk

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This commit is contained in:

Borislav Petkov 2018-01-27 16:24:34 +00:00 • committed by Thomas Gleixner

parent 1dde7415e9

commit 64e16720ea

3 changed files with 13 additions and 9 deletions

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13

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

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3

arch/x86/include/asm/processor.h

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6

arch/x86/kernel/cpu/bugs.c

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