KVM: selftests: Add a helper to set proc IRQ affinity for IRQ test

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Add a utility, proc_irq_set_smp_affinity(), to set the CPU affinity of a
Linux host IRQ via the proc filesystem.  Use smp_affinity_list instead of
smp_affinity to avoid having to convert the single CPU to a bitmask.

The helper will be used by the eventfd IRQ test to verify delivery of IRQs
when the affinity is randomized/modified.

Signed-off-by: Josh Hilke <jrhilke@google.com>
[sean: make the utility self-contained, drop "list", massage changelog]
Link: https://patch.msgid.link/20260626213534.3866178-11-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Josh Hilke 2026-06-26 14:35:23 -07:00 • committed by Sean Christopherson

parent 3902e8b02d

commit 380b0e5e0e

2 changed files with 16 additions and 0 deletions

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2

tools/testing/selftests/kvm/include/proc_util.h

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14

tools/testing/selftests/kvm/lib/proc_util.c

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