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arch/x86: Make irq_offload SMP-safe on x86_64

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The irq_offload mechanism was using the same entry of the IDT vector for
all CPUs on SMP systems. This caused race conditions when two CPUs were
doing irq_offload() calls.

This patch addresses that by adding one indirection layer: the
irq_offload() now sets a per CPU entry with the routine and parameter to
be run. Then a software interrupt is generated, and a default handler
will do the appropriate dispatching.

Finally, test "kernel/smp_abort" is enabled for x86 as it should work
now.

Fixes #72172.

Signed-off-by: Ederson de Souza <ederson.desouza@intel.com>
This commit is contained in:
Ederson de Souza 2024-05-28 21:23:28 -07:00 • committed by Henrik Brix Andersen
commit 7f0b5edd8c
2 changed files with 29 additions and 4 deletions
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tests/kernel/smp_abort/testcase.yaml
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@ -1,6 +1,5 @@
tests:
kernel.smp_abort:
arch_exclude: x86 # Buggy irq_offload(), see #71172
tags:
- kernel
- smp