linux-stable.git/tools/testing/selftests/kvm/include/proc_util.h, branch master Linux kernel stable tree KVM: selftests: Add a helper to set proc IRQ affinity for IRQ test 2026-07-07T18:24:44+00:00 Josh Hilke jrhilke@google.com 2026-06-26T21:35:23+00:00 380b0e5e0e30e0ae57056cd18e5a9a60892b2ece 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> 
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>
KVM: selftests: Add helper to get host IRQ from device MSI-X for IRQ bypass test 2026-07-07T18:24:44+00:00 David Matlack dmatlack@google.com 2026-06-26T21:35:21+00:00 362cc00162499413d720fd1c9dfcf1fbba762e9b Introduce proc_util.c and proc_util.h to house utility functions for interacting with the proc filesystem. Add vfio_msix_to_host_irq(), which parses /proc/interrupts, to get the host Linux IRQ for a given VFIO device BDF and MSI-X vector. This helper will be used by the eventfd IRQ test to print the host IRQ number when triggering IRQs via VFIO device, e.g. to aid in debugging if the test fails. Suggested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: David Matlack <dmatlack@google.com> Co-developed-by: Josh Hilke <jrhilke@google.com> Signed-off-by: Josh Hilke <jrhilke@google.com> [sean: massage changelog] Link: https://patch.msgid.link/20260626213534.3866178-9-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> 
Introduce proc_util.c and proc_util.h to house utility functions for
interacting with the proc filesystem.

Add vfio_msix_to_host_irq(), which parses /proc/interrupts, to get the host
Linux IRQ for a given VFIO device BDF and MSI-X vector.

This helper will be used by the eventfd IRQ test to print the host IRQ
number when triggering IRQs via VFIO device, e.g. to aid in debugging if
the test fails.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Co-developed-by: Josh Hilke <jrhilke@google.com>
Signed-off-by: Josh Hilke <jrhilke@google.com>
[sean: massage changelog]
Link: https://patch.msgid.link/20260626213534.3866178-9-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>