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Fix native_lapic_ipi_alloc().

Description

Fix native_lapic_ipi_alloc().

When PTI is enabled, empty IDT slots point to rsvd_pti.

Reported by: Dexuan-BSD Cui <dexuan.bsd@gmail.com>
Sponsored by: The FreeBSD Foundation
MFC after: 5 days

Details

Provenance
kibAuthored on
Parents
rS328467: Implement mitigation for Spectre version 2 attacks on ARMv7.
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