KVM: selftests: Make number of vCPUs configurable in IRQ test

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Extend the eventfd IRQ test with a '-v' flag to allow the user to
configure the number of vCPUs to create and run (versus only ever using a
single vCPU).

Update the routing logic to play nice with 32 bit IDs, enable x2APIC format
in KVM (to enable 32-bit ID routing), and disable KVM's x2APIC broadcast
quirk so that targeting vCPU 255 doesn't blast the interrupt to all vCPUs
when in x2APIC mode.

Signed-off-by: David Matlack <dmatlack@google.com>
Co-developed-by: Josh Hilke <jrhilke@google.com>
Signed-off-by: Josh Hilke <jrhilke@google.com>
Co-developed-by: Sean Christopherson <seanjc@google.com>
Link: https://patch.msgid.link/20260626213534.3866178-20-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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David Matlack 2026-06-26 14:35:32 -07:00 • committed by Sean Christopherson

parent 6b9470baea

commit 0315713a19

1 changed files with 13 additions and 3 deletions

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tools/testing/selftests/kvm/irq_test.c

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