ACPI: processor_idle: use raw_safe_halt() in acpi_idle_play_dead()

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Xen HVM guests were observed taking triple-faults when attempting to
online a previously offlined vCPU.

Investigation showed that the fault was coming from a failing call
to lockdep_assert_irqs_disabled(), in load_current_idt() which was
too early in the CPU bringup to actually catch the exception and
report the failure cleanly.

This was a false positive, caused by acpi_idle_play_dead() setting
the per-cpu hardirqs_enabled flag by calling safe_halt(). Switch it
to use raw_safe_halt() instead, which doesn't do so.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: 6.6+ <stable@vger.kernel.org> # 6.6+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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David Woodhouse 2023-10-27 19:36:51 +01:00 • committed by Rafael J. Wysocki

parent 98b1cc82c4

commit 9bb69ba4c1

1 changed files with 1 additions and 1 deletions

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drivers/acpi/processor_idle.c

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