Re: Yet another KPTI regression with 4.14.x series in a VM

From: David Woodhouse
Date: Sat Jan 13 2018 - 07:30:47 EST


On Sat, 2018-01-13 at 13:08 +0100, Peter Zijlstra wrote:
>
> ÂÂÂÂÂÂÂÂALTERNATIVE "orq $(PTI_SWITCH_PGTABLE_MASK), \scratch_reg",
> ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ "orq $(PTI_SWITCH_MASK), \scratch_reg", X86_FEATURE_PCID
>
> Is not wanting to compile though; probably that whole alternative vs
> macro thing again :/

Welcome to my world. Try

ÂALTERNATIVE __stringify(orq $(PTI_SWITCH_PGTABLE_MASK), \scratch_reg), \
__stringify(orq $(PTI_SWITCH_MASK), \scratch_reg), \
X86_FEATURE_PCID

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